WO2023125516A1 - Wavelength selective switch - Google Patents
Wavelength selective switch Download PDFInfo
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- WO2023125516A1 WO2023125516A1 PCT/CN2022/142271 CN2022142271W WO2023125516A1 WO 2023125516 A1 WO2023125516 A1 WO 2023125516A1 CN 2022142271 W CN2022142271 W CN 2022142271W WO 2023125516 A1 WO2023125516 A1 WO 2023125516A1
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- 230000003287 optical effect Effects 0.000 claims abstract description 246
- 230000010287 polarization Effects 0.000 claims description 206
- 238000006243 chemical reaction Methods 0.000 claims description 97
- 239000006185 dispersion Substances 0.000 claims description 52
- 238000007493 shaping process Methods 0.000 claims description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims description 6
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 26
- 230000000694 effects Effects 0.000 description 17
- 230000005540 biological transmission Effects 0.000 description 15
- 230000002238 attenuated effect Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000001228 spectrum Methods 0.000 description 1
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- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29371—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating principle based on material dispersion
- G02B6/29373—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating principle based on material dispersion utilising a bulk dispersive element, e.g. prism
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/351—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements
- G02B6/3512—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/351—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements
- G02B6/3512—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror
- G02B6/352—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror the reflective optical element having a shaped reflective surface, e.g. a reflective element comprising several reflective surfaces or facets that function together
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
- G02B6/3544—2D constellations, i.e. with switching elements and switched beams located in a plane
- G02B6/3546—NxM switch, i.e. a regular array of switches elements of matrix type constellation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
- G02B6/356—Switching arrangements, i.e. number of input/output ports and interconnection types in an optical cross-connect device, e.g. routing and switching aspects of interconnecting different paths propagating different wavelengths to (re)configure the various input and output links
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
Definitions
- the present application relates to the field of optical communication, in particular to a wavelength selective switch.
- the network transmission capacity can be improved by increasing the operating frequency spectrum width (number of channels) of the channel, for example, extending the original C-band to C-band and L-band.
- SRS Stimulated Raman Scattering
- An embodiment of the present application provides a wavelength selective switch (Wavelength Selective Switch, WSS), which is used to improve the stability of signal transmission.
- WSS Wavelength Selective Switch
- the present application provides a wavelength selective switch.
- the wavelength selective switch includes: a signal light input port, a false light input port, an output port, a first dispersive element, a second dispersive element, a first optical switch array, a second optical switch array, a first mirror group, and a second mirror group and third lens group.
- the signal light input ports and the dummy light input ports are distributed along the first direction.
- the first dispersion element is used to decompose the signal light from the signal light input port into multiple sub-wavelength signal lights in the second direction, and decompose the spurious light from the spurious light input port into multiple sub-wavelength spurious lights in the second direction .
- the second direction is perpendicular to the first direction.
- the first lens group is used for collimating multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the second direction.
- the first optical switch array is used to adjust the deflection directions of the multiple sub-wavelength signal lights from the first lens.
- the second mirror group is used to guide the sub-wavelength signal light from the first optical switch array and the sub-wavelength dummy light from the first mirror group to the second optical switch array.
- the incident positions of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength on the second optical switch array are the same.
- the second optical switch array is used to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength signal light or sub-wavelength dummy light of each wavelength is transmitted to the output port.
- the third mirror group is used for converging the sub-wavelength signal light and/or the sub-wavelength dummy light from the second optical switch array in the second direction.
- the second dispersion element is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the third mirror group, and directing the multiplexed light to the output port.
- the false light of this wavelength can be selected by the second optical switch array to upload the false light to fill the channel of the wave-dropped signal light, In this way, the full wave state is maintained, the SRS effect is stable, and the stability of signal transmission is improved.
- the second optical switch array only needs to switch in two output directions, the adjustment speed is faster, and the fast uploading of signal light and false light can be realized.
- the first sub-wavelength incident at the first incident position on the second optical switch array if the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is greater than or equal to a preset value, the first sub-wavelength incident at the first incident position The long holiday light is transmitted to the output port through the second optical switch array. If the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is less than a preset value, the first sub-wavelength signal light is transmitted to the output port through the second optical switch array.
- the sub-wavelength signal light and sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still
- sub-wavelength false light can be uploaded to ensure that the light after passing through the WSS is in a full-wave state.
- the multiple sub-wavelength false lights from the first optical group are transmitted to the second optical group through the first optical switch array. That is to say, the first optical switch array can also adjust the deflection direction of the incident sub-wavelength false light, which expands the application scenarios of this solution.
- the first optical switch array is also used to adjust the deflection direction of the second sub-wavelength false light from the first mirror group.
- the second sub-wavelength false light after the deflection direction is adjusted is not guided to the second optical switch array.
- the second optical switch array is used to adjust the deflection direction of the second sub-wavelength signal light from the second mirror group, so as to attenuate the energy transmitted to the output port by the second sub-wavelength signal light.
- the wavelength of the second sub-wavelength dummy light is the same as that of the second sub-wavelength signal light.
- the second sub-wavelength false light needs to be blocked by the first optical switch array to avoid the second sub-wavelength signal light
- the false light of the second sub-wavelength is enhanced to ensure the attenuation effect.
- the signal light of the third sub-wavelength is not guided to the second optical switch array after the deflection direction is adjusted by the first optical switch array.
- the second optical switch array is used to adjust the deflection direction of the third sub-wavelength false light from the second mirror group, so as to attenuate the energy transmitted to the output port by the third sub-wavelength false light.
- the third sub-wavelength dummy light has the same wavelength as the third sub-wavelength signal light.
- the signal light of the third sub-wavelength needs to be blocked by the first optical switch array, so as to avoid false light of the third sub-wavelength
- the third sub-wavelength signal light is enhanced at the same time, which ensures the attenuation effect.
- the WSS further includes a fourth mirror group and a fifth mirror group.
- the fourth mirror group is used to collimate and shape the signal light from the signal light input port before guiding it to the first dispersion element, and to collimate and shape the false light from the false light input port before guiding it to the first dispersion element.
- the fifth mirror group is used to collimate and shape the combined light from the second dispersive element before guiding it to the output port.
- the first lens group includes a first lens, a second lens and a third lens.
- the first lens is used to transmit the multiple sub-wavelength signal lights from the first dispersive element, or refract the multiple sub-wavelength signal lights from the first dispersive element in the first direction.
- the second lens is used to transmit the multiple sub-wavelength false lights from the first dispersion element, or refract the multiple sub-wavelength false lights from the first dispersion element in the first direction.
- the third lens is used for collimating the multiple sub-wavelength signal lights from the first lens in the second direction, and collimating the multiple sub-wavelength false lights from the second lens.
- the first mirror group improves the feasibility of the solution.
- multiple signal lights can be focused to the same position of the first optical switch array in the first direction through the first lens, and false light can be directed to the first light through the second lens Other positions of the switch array in the first direction.
- the second lens group includes a fourth lens, a fifth lens and a sixth lens.
- the fourth lens is used for converging the sub-wavelength signal light from the first optical switch array in the second direction, and converging the sub-wavelength false light from the first mirror group.
- the fifth lens is used for converging the sub-wavelength signal light and the sub-wavelength false light from the fourth lens in the first direction.
- the sixth lens is used to collimate the sub-wavelength signal light and the sub-wavelength false light from the fifth lens in the second direction and direct them to the second optical switch array.
- the third lens group includes a seventh lens and an eighth lens.
- the seventh lens is used for converging the sub-wavelength signal light from the second optical switch array in the second direction, and converging the sub-wavelength false light from the second optical switch array.
- the eighth lens is used for beam shaping the sub-wavelength signal light and sub-wavelength dummy light from the seventh lens.
- the first optical switch array is liquid crystal on silicon (Liquid Crystal on Silicon, LCOS), and the second optical switch array is digital light processor (Digital Light Processer, DLP).
- LCOS liquid crystal on silicon
- DLP Digital Light Processer
- the WSS also includes a controller, and the first optical switch array and the second optical switch array are controlled by the controller, so as to control the first optical switch array to perform wavelength selection according to actual conditions, and to control The second optical switch array selects one of the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength.
- the present application provides a wavelength selective switch.
- the wavelength selective switch includes: a signal light input port, a dummy light input port, an output port, a first dispersion element, a second dispersion element, an optical switch array, a first polarization conversion device, a second polarization conversion device, a polarization beam combiner, A polarization conversion array, a polarization splitter, a first mirror group, a second mirror group and a third mirror group.
- the signal light input ports and the dummy light input ports are distributed along the first direction.
- the first polarization conversion device is used for converting the signal light from the signal light input port into a first polarization state.
- the second polarization conversion device is used for converting the dummy light from the dummy light input port into a second polarization state.
- the first polarization state and the second polarization state are orthogonal to each other.
- the first dispersion element is used to decompose the signal light from the first polarization conversion device into multiple sub-wavelength signal lights in the second direction, and decompose the spurious light from the second polarization conversion device into multiple sub-wavelengths in the second direction Holiday light.
- the second direction is perpendicular to the first direction.
- the first lens group is used for collimating multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the second direction.
- the optical switch array is used to adjust the deflection directions of the multiple sub-wavelength signal lights from the first lens.
- the second mirror group is used to guide the sub-wavelength signal light from the optical switch array and the sub-wavelength false light from the first mirror group to the polarization beam combiner.
- the polarization beam combiner is used to combine the sub-wavelength signal light and sub-wavelength dummy light from the second mirror group, and guide the combined sub-wavelength signal light and sub-wavelength dummy light to the polarization conversion array.
- the incident positions of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength on the polarization conversion array are the same.
- the polarization conversion array is used to adjust the polarization state of the incident light at each incident position, so as to select the polarization state of each sub-wavelength signal light and the polarization state of each sub-wavelength false light output from the polarization conversion array.
- the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength output from the polarization conversion array have different polarization states.
- the polarization splitter is used to transmit the sub-wavelength signal light and/or sub-wavelength dummy light with the first polarization state from the polarization conversion array, and reflect the sub-wavelength signal light and/or sub-wavelength with the second polarization state from the polarization conversion array Holiday light.
- the third mirror group is used for converging the sub-wavelength signal light and/or the sub-wavelength false light transmitted by the polarization splitter in the second direction.
- the second dispersion element is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the third mirror group, and directing the multiplexed light to the output port.
- the false light of this wavelength can be selected through the polarization conversion array and the deflection splitter to upload the false light to fill the space of the wave-dropped signal light.
- the SRS effect is stable, and the stability of signal transmission is improved.
- the use of the polarization conversion array only needs to convert the incident light between two polarization states, the adjustment speed is faster, and the signal light and false light can be uploaded quickly.
- the first sub-wavelength false light incident at the first incident position After passing through the polarization conversion array it has a first polarization state, and the first sub-wavelength signal light has a second polarization state after passing through the polarization conversion array.
- the first sub-wavelength false light has a second polarization state after passing through the polarization conversion array, and the first sub-wavelength The signal light has a first polarization state after passing through the polarization conversion array.
- the sub-wavelength signal light and sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still continue to transmit , for abnormally transmitted sub-wavelength signal light, sub-wavelength false light can be uploaded to ensure that the light after passing through the WSS is in a full-wave state.
- the multiple sub-wavelength false lights from the first mirror group are transmitted to the second mirror group through the optical switch array. That is to say, the optical switch array can also adjust the deflection direction of the incident sub-wavelength false light, which expands the application scenarios of this solution.
- the optical switch array is also used to adjust the deflection direction of the second sub-wavelength false light from the first mirror group, wherein the second sub-wavelength false light after the deflection direction is adjusted is not guided to the polarization beam combiner .
- the polarization conversion array is used to adjust the polarization state of the second sub-wavelength signal light from the polarization beam combiner, so as to attenuate the energy of the second sub-wavelength signal light transmitted to the output port.
- the wavelength of the second sub-wavelength dummy light is the same as that of the second sub-wavelength signal light.
- the second sub-wavelength false light needs to be blocked by the optical switch array to avoid the second sub-wavelength signal light being attenuated.
- the false light of the second sub-wavelength is enhanced to ensure the attenuation effect.
- the signal light of the third sub-wavelength is not guided to the polarization beam combiner after the deflection direction is adjusted by the optical switch array.
- the polarization conversion array is used to adjust the polarization state of the third sub-wavelength dummy light from the polarization beam combiner, so as to attenuate the energy transmitted to the output port by the third sub-wavelength dummy light.
- the third sub-wavelength dummy light has the same wavelength as the third sub-wavelength signal light.
- the third sub-wavelength signal light needs to be blocked by the optical switch array, so as to avoid the attenuation of the third sub-wavelength false light
- the third sub-wavelength signal light is enhanced to ensure the attenuation effect.
- the WSS further includes a fourth mirror group and a fifth mirror group.
- the fourth mirror group is used to collimate and beam-shape the signal light from the signal light input port before guiding it to the first polarization conversion device, and to collimate and beam-shape the false light from the false light input port before guiding it to the first polarization conversion device.
- the fifth mirror group is used to collimate and shape the combined light from the second dispersive element before guiding it to the output port.
- the first lens group includes a first lens, a second lens and a third lens.
- the first lens is used to transmit the multiple sub-wavelength signal lights from the first dispersive element, or refract the multiple sub-wavelength signal lights from the first dispersive element in the first direction.
- the second lens is used for transmitting the multiple sub-wavelength false lights from the first dispersion element, or refracting the multiple sub-wavelength false lights from the first dispersion element in the first direction.
- the third lens is used for collimating the multiple sub-wavelength signal lights from the first lens in the second direction, and collimating the multiple sub-wavelength false lights from the second lens.
- the first mirror group improves the feasibility of the solution.
- multiple signal lights can be focused to the same position of the optical switch array in the first direction through the first lens, and false light can be directed to the optical switch array through the second lens. the other in one direction.
- the second lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens and a reflection mirror.
- the fourth lens is used for converging the sub-wavelength signal light from the optical switch array in the second direction, and converging the sub-wavelength false light from the first lens group.
- the fifth lens is used for beam shaping the sub-wavelength signal light from the fourth lens.
- the sixth lens is used to collimate the sub-wavelength signal light from the fifth lens in the second direction and guide it to the polarization beam combiner.
- the seventh lens is used for beam shaping the sub-wavelength false light from the fourth lens.
- the mirror is used to reflect the sub-wavelength false light from the seventh lens to the polarization beam combiner.
- the third lens group includes an eighth lens and a ninth lens.
- the eighth lens is used for converging the sub-wavelength signal light from the polarization splitter in the second direction, and converging the sub-wavelength false light from the polarization splitter.
- the ninth lens is used for beam shaping the sub-wavelength signal light and sub-wavelength dummy light from the eighth lens.
- the optical switch array is LCOS
- the polarization conversion array is Ferroelectric Liquid Crystal on Silicon (F-LCOS).
- F-LCOS Ferroelectric Liquid Crystal on Silicon
- the WSS also includes a controller, and the optical switch array and the polarization conversion array are controlled by the controller, so as to control the optical switch array to perform wavelength selection according to the actual situation, and control the polarization conversion array to adjust the incident light according to the actual situation. polarization state, and combine the polarization separator to select one of the sub-wavelength signal light and sub-wavelength false light of the same wavelength.
- the WSS has a signal light input port and a dummy light input port, wherein the dummy light is a light beam that does not carry information.
- the signal light and false light will be dispersed after passing through the dispersive element, thereby decomposing into multiple sub-wavelength signal light and multiple sub-wavelength false light.
- the function of the first optical switch array is to adjust the deflection direction of multiple sub-wavelength signal lights to select the sub-wavelength signal light to be transmitted to the second optical switch array.
- the sub-wavelength signal light of the same wavelength and the sub-wavelength false light have the same incident position on the second optical switch array, and the function of the second optical switch array is to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength of each wavelength
- the wavelength signal light and the sub-wavelength dummy light are selected, and the selected sub-wavelength signal light or sub-wavelength dummy light can be transmitted to the output port.
- the false light of this wavelength can be selected by the second optical switch array to upload the false light to fill the channel of the wave-dropped signal light, thereby Keep the full wave state, the SRS effect is stable, and the stability of signal transmission is improved.
- the second optical switch array only needs to switch in two output directions, the adjustment speed is faster, and the fast uploading of signal light and false light can be realized.
- FIG. 1 is a schematic diagram of an optical transmission system applied in an embodiment of the present application
- Fig. 2 (a) is the schematic diagram of the first optical path of WSS in the dispersion direction in the embodiment of the present application;
- Fig. 2 (b) is the schematic diagram of the first optical path of the WSS in the port direction in the embodiment of the present application;
- Fig. 3 (a) is the light spot distribution schematic diagram of sub-wavelength signal light and sub-wavelength false light on the first optical switch array
- Fig. 3 (b) is the spot distribution schematic diagram of sub-wavelength signal light and sub-wavelength false light on the second optical switch array
- Figure 4(a) is a schematic diagram of the second optical path of WSS in the dispersion direction in the embodiment of the present application.
- Figure 4(b) is a schematic diagram of the second optical path of the WSS in the port direction in the embodiment of the present application.
- Figure 5(a) is a schematic diagram of the third optical path of the WSS in the dispersion direction in the embodiment of the present application.
- Figure 5(b) is a schematic diagram of the third optical path of the WSS in the port direction in the embodiment of the present application.
- Fig. 6 (a) is the schematic diagram of the fourth optical path of WSS in the dispersion direction in the embodiment of the present application.
- FIG. 6( b ) is a schematic diagram of a fourth optical path of the WSS in the port direction in the embodiment of the present application.
- the embodiment of the present application provides a wavelength selective switch (Wavelength Selective Switch, WSS), which can quickly upload false light to fill the channel of the wave-dropped signal light, thereby maintaining the full-wave state, the SRS effect is stable, and the efficiency of signal transmission is improved. stability.
- WSS wavelength selective switch
- the terms “first”, “second” and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, and this is merely a description of the manner in which objects with the same attribute are described in the embodiments of the present application.
- FIG. 1 is a schematic diagram of an optical transmission system applied in an embodiment of the present application.
- the optical transmission system includes an optical amplifier 1, an optical amplifier 2, a wavelength selective switch 1, a wavelength selective switch 2, an upper and lower wavelength selective switch (Add Drop WSS, ADWSS) 1 and an upper and lower wavelength selective switch 2.
- the channel should be in a full-wave state.
- the light transmitted on the channel may include signal light and false light, wherein the false light is light that does not carry a signal. That is to say, some idle channels that do not transmit signal light can be filled with false light.
- the light passing through the optical amplifier 1 is in a full-wave state, wherein the wavelengths of signal light are ⁇ 1- ⁇ 4, and the wavelengths of dummy light are ⁇ 5 and ⁇ 6.
- the signal light with the wavelength ⁇ 1 is downloaded to the upper and lower wavelength selective switch 1.
- the false light of wavelength ⁇ 5 and wavelength ⁇ 6 is blocked by the wavelength selective switch 1 , and the upper and lower wavelength selective switch 2 uploads the signal light of wavelength ⁇ 5 and wavelength ⁇ 6 to the wavelength selective switch 2 .
- the wavelength selective switch 2 will also upload the false light with the wavelength ⁇ 1, so that the light output from the wavelength selective switch 2 to the optical amplifier 2 is still in a full-wave state.
- the transmission direction of light is defined as Z direction
- the distribution direction of ports is defined as X direction
- the dispersion direction of light is defined as Y direction.
- the X direction is perpendicular to the Z direction
- the Y direction is perpendicular to the Z direction
- the X direction is perpendicular to the Y direction.
- the present application does not limit the numbers of signal light input ports, dummy light input ports, and output ports, and the numbers shown in the drawings are just examples.
- Fig. 2(a) is a schematic diagram of the first optical path of the WSS in the dispersion direction in the embodiment of the present application.
- Fig. 2(b) is a schematic diagram of the first optical path of the WSS in the port direction in the embodiment of the present application.
- this wavelength selective switch comprises: signal light input port 10, dummy light input port 20, the first dispersion element 30, the first optical switch array 40, the second optical switch Array 50 , second dispersive element 60 , output port 70 , mirror group 1 , mirror group 2 and mirror group 3 .
- the signal light input port 10 and the dummy light input port 20 are distributed in the X direction.
- the wavelength selective switch may also include mirror group 4 and mirror group 5 .
- the lens group 4 is used to collimate and beam-shape the signal light from the signal light input port 10 before guiding it to the first dispersion element 30, and to collimate and reshape the false light from the false light input port 20 first.
- the beam is shaped and then directed to the first dispersive element 30 .
- the first dispersion element 30 is used to decompose the signal light from the signal input port 10 into multiple sub-wavelength signal lights in the Y direction, and decompose the false light from the false light input port 20 into multiple sub-wavelength false lights in the Y direction .
- the wavelengths of the plurality of sub-wavelength signal lights are different, and the wavelengths of the plurality of sub-wavelength dummy lights are different.
- the mirror group 1 is used to collimate multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction, so as to convert the angle difference in the wavelength direction into the position difference in the wavelength direction, and the multiple sub-wavelength signal lights will be respectively incident on the first At different positions of an optical switch array 40 , multiple sub-wavelength false lights are respectively incident on different positions of the first optical switch array 40 .
- the first optical switch array 40 is used to adjust the deflection directions of the incident multiple sub-wavelength signal lights and multiple sub-wavelength dummy lights.
- the mirror group 2 is used to guide multiple sub-wavelength signal lights and multiple sub-wavelength dummy lights from the first optical switch array 40 to the second optical switch array 50 to convert positional differences in port directions into angular differences in port directions.
- the incident positions of the sub-wavelength signal light and the sub-wavelength false light of the same wavelength on the second optical switch array 50 are the same, but the incident angles are different.
- the second optical switch array 50 is used to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength signal light or sub-wavelength dummy light of each wavelength is transmitted to the output port 70 . It is equivalent to selecting one of the sub-wavelength signal light and the sub-wavelength dummy light of each wavelength through the second optical switch array 50 , wherein the selected sub-wavelength signal light or sub-wavelength dummy light is transmitted to the output port 70 .
- the mirror group 3 is used to converge the sub-wavelength signal light and/or sub-wavelength dummy light from the second optical switch array 50 in the Y direction.
- the second dispersion element 60 is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the mirror group 3 .
- the mirror group 5 is used to shape and collimate the beams of the multiplexed light and guide it to the output port 70 .
- Fig. 3(a) is a schematic diagram of spot distribution of sub-wavelength signal light and sub-wavelength false light on the first optical switch array.
- Fig. 3(b) is a schematic diagram of spot distribution of sub-wavelength signal light and sub-wavelength false light on the second optical switch array.
- the light spot shown by the solid line is the light spot of the sub-wavelength signal light
- the light spot shown by the dotted line is the light spot of the sub-wavelength false light.
- the light spots of each sub-wavelength signal light and the light spots of each sub-wavelength dummy light are arranged along the Y direction.
- the spot of sub-wavelength signal light of the same wavelength and the spot of sub-wavelength dummy light have a positional deviation.
- the light spots of sub-wavelength signal light of the same wavelength and the light spots of sub-wavelength false light overlap. It should be understood that, in practical applications, completely or partially overlapped light spots of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength can be regarded as having the same incident position on the second optical switch array 50 .
- both the above-mentioned first optical switch array 40 and the second optical switch array 50 are controlled by a controller (not shown in the figure).
- the controller realizes the wavelength selection function by controlling the first optical switch array 40, that is, the first optical switch array 40 can guide the sub-wavelength signal light and/or sub-wavelength false light of a specified wavelength to the second optical switch by adjusting the deflection direction of the incident light Array 50.
- the controller realizes the selection of sub-wavelength signal light and sub-wavelength false light by controlling the second optical switch array 50, that is, the second optical switch array 50 can adjust the sub-wavelength signal light and sub-wavelength false light of the same wavelength by adjusting the deflection direction of the incident light Choose one of the two.
- the first optical switch array 40 has the ability to adjust any deflection direction, while the second optical switch array 50 can only switch in two deflection directions. Therefore, the adjustment speed of the second optical switch array 50 is faster than that of the first optical switch array 40, and can realize fast uploading of signal light and false light.
- the second optical switch array 50 does not change the deflection direction of the incident light, then the sub-wavelength signal light is transmitted to the output port 70; The array 50 changes the deflection direction of the incident light, and then the sub-wavelength false light is transmitted to the output port 70 .
- the second optical switch array 50 if both the sub-wavelength signal light and the sub-wavelength false light of the same wavelength are incident on the second optical switch array 50, the second optical switch array 50 will select to transmit the sub-wavelength signal light, that is, the sub-wavelength signal light passes through The second optical switch array 50 transmits to the output port 70 . If the sub-wavelength signal light is not incident on the second optical switch array 50 or the energy attenuation of the sub-wavelength signal light is large, the second optical switch array 50 will choose to transmit the sub-wavelength false light of the same wavelength, that is, the sub-wavelength false light passes through the second light Switch array 50 transmits to output port 70 .
- the energy of the sub-wavelength signal light incident on the second optical switch array 50 may be detected by an optical performance monitoring (Optical Performance Monitoring, OPM) device. Assuming that the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array 50 is greater than or equal to the preset value, the second optical switch array 50 selects to upload the light with the same wavelength as the first sub-wavelength signal light. First sub-wavelength false light. On the contrary, the second optical switch array 50 selects to upload the first sub-wavelength signal light.
- the preset value is subject to actual application, for example, 5dB, which is not limited here.
- the sub-wavelength signal light and sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still continue to transmit , for abnormally transmitted sub-wavelength signal light, sub-wavelength false light can be uploaded to ensure that the light after passing through the WSS is in a full-wave state.
- the present application does not limit the specific types of the first optical switch array 40 and the second optical switch array 50 .
- the first optical switch array 40 adopts liquid crystal on silicon (Liquid Crystal on Silicon, LCOS)
- the second optical switch array 50 adopts digital light processor (Digital Light Processer, DLP).
- DLP may also be called a digital micromirror device (Digital Micromirror Device, DMD).
- DMD Digital Micromirror Device
- the present application also does not limit the specific types of the first dispersion element 30 and the second dispersion element 60 .
- the first dispersive element 30 and the second dispersive element 60 may be gratings, diffractive optical elements (Difractive Optical Element, DOE) or metasurface elements.
- the WSS shown in FIG. 2( a ) and FIG. 2( b ) may also be used to attenuate sub-wavelength signal light or sub-wavelength false light. It should be understood that the deflection direction of the sub-wavelength signal light or the sub-wavelength false light is specifically adjusted by the second optical switch array 50 to perform attenuation. In addition, before attenuating the sub-wavelength signal light, it is also necessary to prevent the sub-wavelength false light of the same wavelength from entering the second optical switch array 50.
- the sub-wavelength false light will be enhanced while the sub-wavelength signal light is attenuated, affecting the attenuation effect on the sub-wavelength signal light. That is to say, if the second optical switch array 50 reduces a part of the sub-wavelength signal light transmitted to the output port 70, a part of the sub-wavelength false light transmitted to the output port 70 will be correspondingly increased, and the two are in a trade-off relationship. . Similarly, before attenuating sub-wavelength false light, it is also necessary to prevent sub-wavelength signal light of the same wavelength from entering the second optical switch array 50 . The following specific implementation methods will be introduced respectively.
- Embodiment 1 Attenuation of sub-wavelength signal light.
- the first optical switch array 40 adjusts the deflection direction of the incident second sub-wavelength dummy light so that the second sub-wavelength dummy light does not guide to the second optical switch array 50 .
- the second optical switch array 50 adjusts the deflection direction of the incident second sub-wavelength signal light to attenuate the energy transmitted to the output port 70 by the second sub-wavelength signal light.
- the wavelength of the second sub-wavelength signal light is the same as that of the second sub-wavelength dummy light.
- Embodiment 2 Attenuating sub-wavelength false light.
- the first optical switch array 40 adjusts the deflection direction of the incident third sub-wavelength signal light so that the third sub-wavelength signal light does not guide to the second optical switch array 50 .
- the second optical switch array 50 adjusts the deflection direction of the third sub-wavelength dummy light to attenuate the energy transmitted to the output port 70 by the third sub-wavelength dummy light.
- the third sub-wavelength signal light and the third sub-wavelength dummy light have the same wavelength.
- the present application does not limit the composition of the mirror group 1 , the mirror group 2 , the mirror group 3 , the mirror group 4 and the mirror group 5 , and a specific implementation is provided below.
- mirror group 1 includes lens 1, lens 2 and lens 3
- mirror group 2 includes lens 4
- mirror group 3 includes lens 7 and lens 8
- the mirror group 4 includes a lens 9 and a lens 10
- the mirror group 5 includes a lens 11 and a lens 12 .
- the lens 9 is used for collimating the incident signal light and false light
- the lens 10 is used for beam shaping the incident signal light and false light.
- the lens 1 is used to converge the multi-path sub-wavelength signal lights from multiple signal light input ports 10 in the X direction. Taking the three signal light input ports 10 shown in FIG.
- the transmitted one-way sub-wavelength signal light is transmitted to the first optical switch array 40 through the lens 1, and the other two-way sub-wavelength signal light is refracted to the first optical switch array 40 through the lens 1, and the three-way sub-wavelength signal light is converged to the first optical switch array 40 at the same position in the X direction.
- the function of lens 2 is similar to that of lens 1, and is used to transmit or refract the incident sub-wavelength false light in the X direction, so that the sub-wavelength false light and sub-wavelength signal light incident on the first optical switch array 40 are in the X direction. The incidence position is different.
- the lens 3 is used to collimate the incident multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction.
- the lens 4 is used to converge the incident sub-wavelength signal light and the incident sub-wavelength false light in the Y direction, and the lens 5 is used to converge the incident sub-wavelength signal light and sub-wavelength false light in the X direction.
- the lens 6 is used to collimate the incident sub-wavelength signal light and sub-wavelength false light in the Y direction.
- the lens 7 is used to converge the incident sub-wavelength signal light and the incident sub-wavelength dummy light in the Y direction, and the lens 8 is used to perform beam shaping on the incident sub-wavelength signal light and sub-wavelength dummy light.
- the lens 11 is used to shape the beam of the light combined by the second dispersion element 60
- the lens 12 is used to collimate the combined light.
- the front focal plane of the lens 10 coincides with the back focal plane of the lens 9 .
- the first dispersion element 30 is located at the rear focal plane of the lens 10 and at the front focal plane of the lens 3 .
- the first optical switch array 40 is located at the rear focal plane of the lens 3 and at the front focal plane of the lens 4.
- the rear focal plane of lens 4 coincides with the front focal plane of lens 6 .
- the second optical switch array 50 is located at the rear focal plane of the lens 6 and at the front focal plane of the lens 7 .
- the second dispersion element 60 is located at the rear focal plane of the lens 7 and at the front focal plane of the lens 11 .
- the lens 11 is located at the front focal plane of the lens 12 .
- the lens 1 is close to the first dispersion element 30
- the lens 8 is close to the second dispersion element 60 .
- the front focal plane of lens 1 coincides with the back focal plane of lens 9 .
- the first optical switch array 40 is located on the back focal plane of the lens 1 .
- the front focal plane of lens 2 coincides with the back focal plane of lens 9 .
- the first optical switch array 40 is located on the back focal plane of the lens 2 .
- the first optical switch array 40 is located on the front focal plane of the lens 5
- the second optical switch array 50 is located on the rear focal plane of the lens 5 .
- the second optical switch array 50 is located on the front focal plane of the lens 8 .
- the back focal plane of lens 8 coincides with the front focal plane of lens 12 .
- FIG. 4(a) is a schematic diagram of the second optical path of the WSS in the dispersion direction in the embodiment of the present application.
- Fig. 4(b) is a schematic diagram of the second optical path of the WSS in the port direction in the embodiment of the present application.
- FIG. 4( a ) shows a schematic diagram of the optical path of the false light in the dispersion direction in this embodiment.
- the beam schematic diagram of the signal light in the dispersion direction in this embodiment is the same as that of FIG. 2( a ).
- sub-wavelength signal light passes through the first optical switch array 40 , while sub-wavelength false light does not pass through the first optical switch array 40 .
- the first optical switch array 40 does not need to adjust the deflection direction of the sub-wavelength dummy light, and each sub-wavelength dummy light will be incident on the second optical switch array 50 . Therefore, the first optical switch array 40 with a smaller size can be used, which reduces the cost.
- this embodiment cannot be applied in scenarios where sub-wavelength signal light needs to be attenuated. It should be understood that, except for the differences described above, this embodiment is similar to the embodiment shown in FIG. 2(a) and FIG. 2(b), and other identical features can be referred to in FIG. The relevant description of the illustrated embodiment is not repeated here.
- the incident positions of the sub-wavelength signal light and the sub-wavelength false light of the same wavelength on the second optical switch array are the same, and the function of the second optical switch array is to adjust the deflection of the incident light at each incident position. direction, so as to select one of the sub-wavelength signal light and sub-wavelength false light of each wavelength, and the selected sub-wavelength signal light or sub-wavelength false light can be transmitted to the output port.
- the second optical switch array only needs to switch in two output directions, the adjustment speed is faster, and the fast uploading of signal light and false light can be realized.
- the above-mentioned embodiment introduces one of the WSS structures provided by the present application, mainly by adjusting the deflection direction of the incident light to select and upload signal light or false light.
- Another WSS structure provided by the present application will be introduced below, which mainly selects to upload signal light or false light by adjusting the polarization state of light.
- the wavelength selective switch includes: a signal light input port 10, a false light input port 20, a first dispersive element 30, an optical switch array 40, a second dispersive element 60, Output port 70 , first polarization conversion device 80 , second polarization conversion device 90 , polarization beam combiner 100 , polarization conversion array 110 , polarization splitter 120 , mirror group 1 , mirror group 2 and mirror group 3 .
- the signal light input port 10 and the dummy light input port 20 are distributed in the X direction.
- the wavelength selective switch may also include mirror group 4 and mirror group 5 .
- the signal light from the signal light input port 10 has components on the first polarization state and the second polarization state, and likewise, the false light from the false light input port 20 has components on the first polarization state and the second polarization state Both also have weight.
- the first polarization state and the second polarization state are orthogonal to each other.
- the first polarization conversion device 80 is used to convert the signal light from the signal light input port 10 into a first polarization state.
- the second polarization conversion device 90 is used for converting the dummy light from the dummy light input port 20 into a second polarization state.
- the mirror group 4 is used to collimate and beam-shape the signal light from the signal light input port 10 before guiding it to the first dispersion element 30, and to collimate and beam-shape the false light from the false light input port 20 first. It is redirected to the first dispersive element 30 .
- the first dispersion element 30 is used to decompose the incident signal light into multiple sub-wavelength signal lights in the Y direction, and decompose the incident false light into multiple sub-wavelength false lights in the Y direction. Wherein, the wavelengths of the plurality of sub-wavelength signal lights are different, and the wavelengths of the plurality of sub-wavelength dummy lights are different.
- the mirror group 1 is used to collimate multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction, so as to convert the angle difference in the wavelength direction into the position difference in the wavelength direction, and the multiple sub-wavelength signal lights will be respectively incident on the light
- multiple sub-wavelength false lights are respectively incident on different positions of the optical switch array 40 .
- the optical switch array 40 is used to adjust the deflection directions of the incident multiple sub-wavelength signal lights and multiple sub-wavelength false lights.
- the mirror group 2 is used to guide multiple sub-wavelength signal lights and multiple sub-wavelength false lights from the optical switch array 40 to the polarization beam combiner 100 .
- the polarization beam combiner 100 is used to combine the input sub-wavelength signal light and sub-wavelength dummy light, and guide the combined sub-wavelength signal light and sub-wavelength dummy light to the polarization conversion array 110 .
- the incident positions of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength on the polarization conversion array 110 are the same.
- the polarization conversion array 110 is used to adjust the polarization state of the incident light at each incident position, so as to select the polarization state of each sub-wavelength signal light and the polarization state of each sub-wavelength dummy light output from the polarization conversion array 110 .
- the polarization splitter 120 is configured to transmit the input sub-wavelength signal light and/or sub-wavelength dummy light with the first polarization state, and reflect the input sub-wavelength signal light and/or sub-wavelength dummy light with the second polarization state.
- the mirror group 3 is used for converging the sub-wavelength signal light and/or the sub-wavelength dummy light transmitted by the polarization splitter 120 in the Y direction.
- the second dispersion element 60 is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the mirror group 3 .
- the mirror group 5 is used to shape and collimate the beams of the multiplexed light and guide it to the output port 70 .
- the spot distribution of the sub-wavelength signal light and the sub-wavelength false light on the optical switch array 40 can be as shown in FIG. As shown in Figure 3(b) above.
- the light spots of the sub-wavelength signal light of the same wavelength and the light spots of the sub-wavelength dummy light completely overlap or partially overlap, which can be regarded as having the same incident position on the polarization conversion array 110 .
- both the optical switch array 40 and the polarization conversion array 110 mentioned above are controlled by a controller (not shown in the figure).
- the controller realizes the wavelength selection function by controlling the optical switch array 40 , that is, the optical switch array 40 can guide the sub-wavelength signal light and/or sub-wavelength false light of a specified wavelength to the polarization conversion array 110 by adjusting the deflection direction of the incident light.
- the controller converts the polarization state of the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength by controlling the polarization conversion array 110 , and selects one of the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength in combination with the polarization separator 120 .
- the polarization conversion array 110 only needs to convert the polarization state of the incident light, the adjustment speed is faster, and the signal light and false light can be uploaded quickly.
- the polarization conversion array 110 does not change the polarization state of the incident light, the sub-wavelength signal light will be transmitted to the output port 70 through the polarization splitter 120; if The polarization conversion array 110 changes the polarization state of the incident light, and then the sub-wavelength false light is transmitted to the output port 70 through the polarization separator 120 .
- the sub-wavelength signal light output from the polarization conversion array 110 will maintain the first polarization state, that is, the sub-wavelength signal Light may be transmitted to output port 70 through polarization splitter 120 . If the sub-wavelength signal light is not incident on the polarization conversion array 110 or the energy attenuation of the sub-wavelength signal light is large, the polarization conversion array 110 will convert the sub-wavelength false light of the same wavelength into the first polarization state, that is, the sub-wavelength false light can pass through the polarization Splitter 120 transmits to output port 70 .
- the energy of the sub-wavelength signal light incident on the polarization conversion array 110 may be detected by an OPM device. Assuming that the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the polarization conversion array 110 is greater than or equal to a preset value, the first sub-wavelength false light output by the polarization conversion array 110 has a first polarization state. On the contrary, the first sub-wavelength signal light output by the second optical switch array 50 maintains the first polarization state.
- the preset value is subject to actual application, for example, 5dB, which is not limited here.
- the sub-wavelength signal light and the sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still continue to transmit, for
- the abnormally transmitted sub-wavelength signal light can be uploaded with sub-wavelength false light to ensure that the light after passing through the WSS is in a full-wave state.
- the present application does not limit the specific types of the optical switch array 40 and the polarization conversion array 110 .
- the optical switch array 40 adopts LCOS
- the polarization conversion array 110 adopts Ferroelectric Liquid Crystal on Silicon (F-LCOS).
- the present application also does not limit the specific types of the first dispersion element 30 and the second dispersion element 60 .
- the first dispersive element 30 and the second dispersive element 60 may be gratings, DOEs or metasurface elements.
- the WSS shown in FIG. 5( a ) and FIG. 5( b ) may also be used to attenuate sub-wavelength signal light or sub-wavelength false light. It should be understood that the polarization state of sub-wavelength signal light or sub-wavelength false light is specifically adjusted through the polarization conversion array 110 to perform attenuation. In addition, before attenuating the sub-wavelength signal light, it is also necessary to prevent the sub-wavelength spurious light of the same wavelength from entering the polarization conversion array 110 .
- the sub-wavelength signal light will be attenuated while the sub-wavelength false light will be enhanced, which will affect the attenuation effect on the sub-wavelength signal light. That is to say, if a part of the sub-wavelength signal light transmitted to the output port 70 is reduced through the polarization conversion array 110, a part of the sub-wavelength spurious light transmitted to the output port 70 will be correspondingly increased, and the two are in a trade-off relationship. Similarly, before attenuating sub-wavelength false light, it is also necessary to prevent sub-wavelength signal light of the same wavelength from entering the polarization conversion array 110 . The following specific implementation methods will be introduced respectively.
- Embodiment 1 Attenuation of sub-wavelength signal light.
- the optical switch array 40 adjusts the deflection direction of the incident second sub-wavelength dummy light so that the second sub-wavelength dummy light does not lead to the polarization beam combiner 100 .
- the polarization conversion array 110 adjusts the polarization state of the incident second sub-wavelength signal light to attenuate the energy transmitted to the output port 70 by the second sub-wavelength signal light.
- the wavelength of the second sub-wavelength signal light is the same as that of the second sub-wavelength dummy light.
- Embodiment 2 Attenuating sub-wavelength false light.
- the optical switch array 40 adjusts the deflection direction of the incident third sub-wavelength signal light so that the third sub-wavelength signal light does not guide to the polarization beam combiner 100 .
- the polarization conversion array 110 adjusts the deflection direction of the third sub-wavelength dummy light to attenuate the energy transmitted to the output port 70 by the third sub-wavelength dummy light.
- the third sub-wavelength signal light and the third sub-wavelength dummy light have the same wavelength.
- the present application does not limit the composition of the mirror group 1 , the mirror group 2 , the mirror group 3 , the mirror group 4 and the mirror group 5 , and a specific implementation is provided below.
- mirror group 1 comprises lens 1, lens 2 and lens 3
- mirror group 2 comprises lens 4, lens 5, lens 6, lens 13 and reflecting mirror
- mirror group 3 Including lens 7 and lens 8
- lens group 4 includes lens 9 and lens 10
- lens group 5 includes lens 11 and lens 12 .
- the lens 9 is used for collimating the incident signal light and false light
- the lens 10 is used for beam shaping the incident signal light and false light.
- the lens 1 is used to converge the multi-channel sub-wavelength signal lights from multiple signal light input ports 10 in the X direction. Taking the three signal light input ports 10 shown in FIG.
- the transmitted one-way sub-wavelength signal light is transmitted to the optical switch array 40 through the lens 1, and the other two-way sub-wavelength signal light is refracted to the optical switch array 40 through the lens 1, and the three-way sub-wavelength signal light is converged to the optical switch array 40 in the X direction. same location.
- the function of lens 2 is similar to that of lens 1, and is used to transmit or refract the incident sub-wavelength false light in the X direction, so that the sub-wavelength false light incident on the optical switch array 40 and the incident sub-wavelength signal light in the X direction The location is different.
- the lens 3 is used to collimate the incident multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction.
- Lens 4 is used to converge the incident sub-wavelength signal light in the Y direction and converge the incident sub-wavelength false light.
- Lens 5 is used to shape the incident sub-wavelength signal light.
- the incident sub-wavelength signal light is collimated.
- the lens 13 is used to shape the incident sub-wavelength false light, and the mirror is used to reflect the sub-wavelength false light from the lens 13 to the polarization beam combiner 100 .
- the lens 7 is used to converge the incident sub-wavelength signal light and the incident sub-wavelength dummy light in the Y direction, and the lens 8 is used to perform beam shaping on the incident sub-wavelength signal light and sub-wavelength dummy light.
- the lens 11 is used to shape the beam of the light combined by the second dispersion element 60 , and the lens 12 is used to collimate the combined light.
- the front focal plane of the lens 10 coincides with the back focal plane of the lens 9 .
- the first dispersion element 30 is located at the rear focal plane of the lens 10 and at the front focal plane of the lens 3 .
- the optical switch array 40 is located at the rear focal plane of the lens 3 and at the front focal plane of the lens 4 .
- the rear focal plane of lens 4 coincides with the front focal plane of lens 6 .
- the polarization conversion array 110 is located at the back focal plane of the lens 6 and at the front focal plane of the lens 7 .
- the second dispersion element 60 is located at the rear focal plane of the lens 7 and at the front focal plane of the lens 11 .
- the lens 11 is located at the front focal plane of the lens 12 .
- the lens 1 is close to the first dispersion element 30
- the lens 8 is close to the second dispersion element 60 .
- the front focal plane of lens 1 coincides with the back focal plane of lens 9 .
- the optical switch array 40 is located at the rear focal plane of the lens 1 .
- the front focal plane of lens 2 coincides with the back focal plane of lens 9 .
- the optical switch array 40 is located on the back focal plane of the lens 2 .
- the optical switch array 40 is located on the front focal plane of the lens 5
- the second optical switch array 50 is located on the rear focal plane of the lens 5 .
- the optical switch array 40 is located on the front focal plane of the lens 13
- the second optical switch array 50 is located on the rear focal plane of the lens 13 .
- the polarization conversion array 110 is located at the front focal plane of the lens 8 .
- the back focal plane of lens 8 coincides with the front focal plane of lens 12 .
- FIG. 6(a) is a schematic diagram of the fourth optical path of the WSS in the dispersion direction in the embodiment of the present application.
- FIG. 6( b ) is a schematic diagram of a fourth optical path of the WSS in the port direction in the embodiment of the present application.
- FIG. 6( a ) shows a schematic diagram of the optical path of the false light in the dispersion direction in this embodiment.
- the beam schematic diagram of the signal light in the dispersion direction in this embodiment is the same as the above-mentioned FIG. 5( a ). As shown in FIG. 6( a ) and FIG.
- sub-wavelength signal light passes through the optical switch array 40 , while sub-wavelength false light does not pass through the optical switch array 40 .
- the optical switch array 40 does not need to adjust the deflection direction of the sub-wavelength dummy light, and each sub-wavelength dummy light will be incident on the polarization beam combiner 100 . Therefore, an optical switch array 40 with a smaller size can be used, reducing the cost.
- this embodiment cannot be applied in scenarios where sub-wavelength signal light needs to be attenuated. It should be understood that, except for the differences described above, this embodiment is similar to the embodiment shown in FIG. 5(a) and FIG. 5(b), and other identical features can be referred to in FIG. The relevant description of the illustrated embodiment is not repeated here.
- the incident position of the sub-wavelength signal light and sub-wavelength false light on the polarization conversion array is the same, and the function of the polarization conversion array is to adjust the polarization state of the incident light at each incident position, and combine
- the polarization separator selects one of the sub-wavelength signal light and the sub-wavelength dummy light of each wavelength, and the selected sub-wavelength signal light or sub-wavelength dummy light can be transmitted to the output port.
- the false light of this wavelength can be selected through the polarization conversion array and the deflection splitter to upload the false light to fill the channel of the dropped signal light , so as to maintain the full wave state, the SRS effect is stable, and the stability of signal transmission is improved.
- the use of the polarization conversion array only needs to convert the incident light between two polarization states, the adjustment speed is faster, and the signal light and false light can be uploaded quickly.
- the above-mentioned embodiments are all introduced by using the transmissive optical switch array 40 .
- a reflective optical switch array 40 may also be used. That is to say, the output port 70 in the WSS is located on the same side as the signal light input port 10 and the dummy light input port 20 , and a folded light path is adopted. It should be understood that the embodiment using the reflective optical switch array 40 can be obtained by simple transformation on the basis of the above-mentioned embodiments, and no drawings and text descriptions are provided here.
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- Optical Communication System (AREA)
Abstract
A wavelength selective switch. Signal light input ports (10) and a false light input port (20) are distributed in a first direction. A first dispersive element (30) is used for decomposing, in a second direction, signal light from the signal light input ports (10) into multiple beams of sub-wavelength signal light, and decomposing, in the second direction, false light from the false light input port (20) into multiple beams of sub-wavelength false light, the second direction being perpendicular to the first direction. A first optical switch array (40) is used for adjusting a deflection direction of the multiple beams of sub-wavelength signal light, and sub-wavelength signal light and sub-wavelength false light of the same wavelength have the same incident position on a second optical switch array (50). The second optical switch array (50) is used for adjusting a deflection direction of incident light at each incident position, so that the sub-wavelength signal light or sub-wavelength false light of each wavelength is transmitted to an output port (70). The second optical switch array (50) selects one of the sub-wavelength signal light and sub-wavelength false light of each wavelength to fill a channel of leaky-wave signal light, thereby maintaining a full-wave state, and improving the stability of signal transmission.
Description
本申请要求于2021年12月29日提交中国国家知识产权局、申请号202111640047.0、申请名称为“一种波长选择开关”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。This application claims the priority of a Chinese patent application with application number 202111640047.0 and application title "A Wavelength Selective Switch" filed with the State Intellectual Property Office of China on December 29, 2021, the entire contents of which are incorporated herein by reference.
本申请涉及光通信领域,尤其涉及一种波长选择开关。The present application relates to the field of optical communication, in particular to a wavelength selective switch.
随着网络中数据流量的飞速增长,对网络传输容量的需求也越来越大。通常可以通过增加信道工作频谱宽度(信道数目)以提升网络传输容量,例如将原有的C波段扩展到C波段和L波段。With the rapid growth of data traffic in the network, the demand for network transmission capacity is also increasing. Generally, the network transmission capacity can be improved by increasing the operating frequency spectrum width (number of channels) of the channel, for example, extending the original C-band to C-band and L-band.
然而,随着信道频谱宽度的增加,在多波长传输***链路中,存在受激拉曼散射(Stimulated Raman Scattering,SRS)效应,短波段的传输功率会向长波段的传输功率转移。在没有发生上波或下波的稳定状态时,由于SRS效应引起的多波长信号之间的功率转移是稳定的。而在发生上波或下波时,多波长信号的数目、分布以及位置等会随机发生变化,导致SRS效应变化复杂,有可能超出了***的承受能力,从而降低了信号传输的稳定性。However, as the spectral width of the channel increases, there is a stimulated Raman scattering (Stimulated Raman Scattering, SRS) effect in the multi-wavelength transmission system link, and the transmission power of the short-wave band will be transferred to the transmission power of the long-wave band. The power transfer between multi-wavelength signals due to the SRS effect is stable when there is no steady state of up-wave or down-wave occurring. When adding or dropping waves occurs, the number, distribution, and position of multi-wavelength signals will change randomly, resulting in complex changes in the SRS effect, which may exceed the system's ability to withstand, thereby reducing the stability of signal transmission.
发明内容Contents of the invention
本申请实施例提供了一种波长选择开关(Wavelength Selective Switch,WSS),用于提高信号传输的稳定性。An embodiment of the present application provides a wavelength selective switch (Wavelength Selective Switch, WSS), which is used to improve the stability of signal transmission.
第一方面,本申请提供了一种波长选择开关。该波长选择开关包括:信号光输入端口、假光输入端口、输出端口、第一色散元件、第二色散元件、第一光开关阵列、第二光开关阵列、第一镜组、第二镜组和第三镜组。其中,信号光输入端口和假光输入端口沿第一方向分布。In a first aspect, the present application provides a wavelength selective switch. The wavelength selective switch includes: a signal light input port, a false light input port, an output port, a first dispersive element, a second dispersive element, a first optical switch array, a second optical switch array, a first mirror group, and a second mirror group and third lens group. Wherein, the signal light input ports and the dummy light input ports are distributed along the first direction.
第一色散元件用于在第二方向上将来自信号光输入端口的信号光分解为多个子波长信号光,并在第二方向上将来自假光输入端口的假光分解为多个子波长假光。其中,第二方向与第一方向垂直。第一镜组用于在第二方向上对多个子波长信号光和多个子波长假光进行准直。第一光开关阵列用于调节来自第一透镜的多个子波长信号光的偏转方向。第二镜组用于将来自第一光开关阵列的子波长信号光和来自第一镜组的子波长假光导向第二光开关阵列。其中,相同波长的子波长信号光和子波长假光在第二光开关阵列上的入射位置相同。第二光开关阵列用于调节每个入射位置处入射光的偏转方向,以使得每个波长的子波长信号光或子波长假光向输出端口传输。第三镜组用于在第二方向上对来自第二光开关阵列的子波长信号光和/或子波长假光进行汇聚。第二色散元件用于对来自第三镜组的子波长信号光和/或子波长假光进行合波,并将合波后的光导向输出端口。The first dispersion element is used to decompose the signal light from the signal light input port into multiple sub-wavelength signal lights in the second direction, and decompose the spurious light from the spurious light input port into multiple sub-wavelength spurious lights in the second direction . Wherein, the second direction is perpendicular to the first direction. The first lens group is used for collimating multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the second direction. The first optical switch array is used to adjust the deflection directions of the multiple sub-wavelength signal lights from the first lens. The second mirror group is used to guide the sub-wavelength signal light from the first optical switch array and the sub-wavelength dummy light from the first mirror group to the second optical switch array. Wherein, the incident positions of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength on the second optical switch array are the same. The second optical switch array is used to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength signal light or sub-wavelength dummy light of each wavelength is transmitted to the output port. The third mirror group is used for converging the sub-wavelength signal light and/or the sub-wavelength dummy light from the second optical switch array in the second direction. The second dispersion element is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the third mirror group, and directing the multiplexed light to the output port.
在该实施方式中,即使某个波长的信号光在传输过程中掉波,也可以通过第二光开关阵列选择该波长的假光来实现上载假光,以填充掉波的信号光的信道,从而保持满波状态,SRS效应稳定,提高了信号传输的稳定性。另外,采用第二光开关阵列只需要在两个输出方向上进行切换即可,调节速度更快,可以实现快速上载信号光和假光。In this embodiment, even if the signal light of a certain wavelength drops during transmission, the false light of this wavelength can be selected by the second optical switch array to upload the false light to fill the channel of the wave-dropped signal light, In this way, the full wave state is maintained, the SRS effect is stable, and the stability of signal transmission is improved. In addition, the second optical switch array only needs to switch in two output directions, the adjustment speed is faster, and the fast uploading of signal light and false light can be realized.
在一些可能的实施方式中,若第二光开关阵列上第一入射位置处入射的第一子波长信号光的能量衰减大于或等于预设值,则第一入射位置处入射的第一子波长假光通过第二光开关阵列向输出端口传输。若第二光开关阵列上第一入射位置处入射的第一子波长信号光的能量衰减小于预设值,则第一子波长信号光通过第二光开关阵列向输出端口传输。In some possible implementations, if the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is greater than or equal to a preset value, the first sub-wavelength incident at the first incident position The long holiday light is transmitted to the output port through the second optical switch array. If the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is less than a preset value, the first sub-wavelength signal light is transmitted to the output port through the second optical switch array.
在该实施方式中,通过检测第二光开关阵列上入射的子波长信号光的能量可以合理地对相同波长的子波长信号光和子波长假光进行选择,使得正常传输的子波长信号光仍能继续传输,对于非正常传输的子波长信号光可以通过上载子波长假光以保证经过WSS后的光处于满波状态。In this embodiment, by detecting the energy of the incident sub-wavelength signal light on the second optical switch array, the sub-wavelength signal light and sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still To continue the transmission, for the sub-wavelength signal light that is not normally transmitted, sub-wavelength false light can be uploaded to ensure that the light after passing through the WSS is in a full-wave state.
在一些可能的实施方式中,来自第一镜组的多个子波长假光经过第一光开关阵列传输至第二镜组。也就是说,第一光开关阵列也可以调节入射的子波长假光的偏转方向,扩展了本方案的应用场景。In some possible implementation manners, the multiple sub-wavelength false lights from the first optical group are transmitted to the second optical group through the first optical switch array. That is to say, the first optical switch array can also adjust the deflection direction of the incident sub-wavelength false light, which expands the application scenarios of this solution.
在一些可能的实施方式中,第一光开关阵列还用于调节来自第一镜组的第二子波长假光的偏转方向。其中,偏转方向调节后的第二子波长假光不导向第二光开关阵列。第二光开关阵列用于调节来自第二镜组的第二子波长信号光的偏转方向,以衰减第二子波长信号光向输出端口传输的能量。其中,第二子波长假光与第二子波长信号光的波长相同。在该实施方式中,通过第二光开关阵列对第二子波长信号光进行衰减之前,还需要先通过第一光开关阵列阻断第二子波长假光,以避免在对第二子波长信号光进行衰减的同时增强第二子波长假光,保证了衰减效果。In some possible implementation manners, the first optical switch array is also used to adjust the deflection direction of the second sub-wavelength false light from the first mirror group. Wherein, the second sub-wavelength false light after the deflection direction is adjusted is not guided to the second optical switch array. The second optical switch array is used to adjust the deflection direction of the second sub-wavelength signal light from the second mirror group, so as to attenuate the energy transmitted to the output port by the second sub-wavelength signal light. Wherein, the wavelength of the second sub-wavelength dummy light is the same as that of the second sub-wavelength signal light. In this embodiment, before the second sub-wavelength signal light is attenuated by the second optical switch array, the second sub-wavelength false light needs to be blocked by the first optical switch array to avoid the second sub-wavelength signal light When the light is attenuated, the false light of the second sub-wavelength is enhanced to ensure the attenuation effect.
在一些可能的实施方式中,第三子波长信号光经过第一光开关阵列调节偏转方向后不导向第二光开关阵列。第二光开关阵列用于调节来自第二镜组的第三子波长假光的偏转方向,以衰减第三子波长假光向输出端口传输的能量。其中,第三子波长假光与第三子波长信号光的波长相同。在该实施方式中,通过第二光开关阵列对第三子波长假光进行衰减之前,还需要先通过第一光开关阵列阻断第三子波长信号光,以避免在对第三子波长假光进行衰减的同时增强第三子波长信号光,保证了衰减效果。In some possible implementation manners, the signal light of the third sub-wavelength is not guided to the second optical switch array after the deflection direction is adjusted by the first optical switch array. The second optical switch array is used to adjust the deflection direction of the third sub-wavelength false light from the second mirror group, so as to attenuate the energy transmitted to the output port by the third sub-wavelength false light. Wherein, the third sub-wavelength dummy light has the same wavelength as the third sub-wavelength signal light. In this embodiment, before attenuating the false light of the third sub-wavelength by the second optical switch array, the signal light of the third sub-wavelength needs to be blocked by the first optical switch array, so as to avoid false light of the third sub-wavelength When the light is attenuated, the third sub-wavelength signal light is enhanced at the same time, which ensures the attenuation effect.
在一些可能的实施方式中,WSS还包括第四镜组和第五镜组。第四镜组用于对来自信号光输入端口的信号光先进行准直和光束整形再导向第一色散元件,并对来自假光输入端口的假光先进行准直和光束整形再导向第一色散元件。第五镜组用于对来自第二色散元件的合波后的光先进行准直和光束整形再导向输出端口。通过上述方式,在色散之前和合波之后还可以对光进行准直和光束整形,增强了本方案的实用性。In some possible implementation manners, the WSS further includes a fourth mirror group and a fifth mirror group. The fourth mirror group is used to collimate and shape the signal light from the signal light input port before guiding it to the first dispersion element, and to collimate and shape the false light from the false light input port before guiding it to the first dispersion element. Dispersion element. The fifth mirror group is used to collimate and shape the combined light from the second dispersive element before guiding it to the output port. Through the above method, the light can also be collimated and beam shaped before the dispersion and after the multiplexing, which enhances the practicability of the solution.
在一些可能的实施方式中,第一镜组包括第一透镜、第二透镜和第三透镜。第一透镜用于透射来自第一色散元件的多个子波长信号光,或者,在第一方向上对来自第一色散元件的多个子波长信号光进行折射。第二透镜用于透射来自第一色散元件的多个子波长假光,或者, 在第一方向上对来自第一色散元件的多个子波长假光进行折射。第三透镜用于在第二方向上对来自第一透镜的多个子波长信号光进行准直,并对来自第二透镜的多个子波长假光进行准直。通过上述方式,提供了一种第一镜组的具体实现方式,提高了本方案的可实现性。在具有多个信号光输入端口的场景中,可以通过第一透镜将多路信号光聚焦到第一光开关阵列在第一方向上的相同位置,通过第二透镜可以将假光导向第一光开关阵列在第一方向上的其他位置。In some possible implementation manners, the first lens group includes a first lens, a second lens and a third lens. The first lens is used to transmit the multiple sub-wavelength signal lights from the first dispersive element, or refract the multiple sub-wavelength signal lights from the first dispersive element in the first direction. The second lens is used to transmit the multiple sub-wavelength false lights from the first dispersion element, or refract the multiple sub-wavelength false lights from the first dispersion element in the first direction. The third lens is used for collimating the multiple sub-wavelength signal lights from the first lens in the second direction, and collimating the multiple sub-wavelength false lights from the second lens. Through the foregoing manner, a specific implementation manner of the first mirror group is provided, which improves the feasibility of the solution. In a scene with multiple signal light input ports, multiple signal lights can be focused to the same position of the first optical switch array in the first direction through the first lens, and false light can be directed to the first light through the second lens Other positions of the switch array in the first direction.
在一些可能的实施方式中,第二镜组包括第四透镜、第五透镜和第六透镜。第四透镜用于在第二方向上对来自第一光开关阵列的子波长信号光进行汇聚,并对来自第一镜组的子波长假光进行汇聚。第五透镜用于在第一方向上对来自第四透镜的子波长信号光和子波长假光进行汇聚。第六透镜用于在第二方向上对来自第五透镜的子波长信号光和子波长假光进行准直并导向第二光开关阵列。通过上述方式,提供了一种第二镜组的具体实现方式,提高了本方案的可实现性。In some possible implementation manners, the second lens group includes a fourth lens, a fifth lens and a sixth lens. The fourth lens is used for converging the sub-wavelength signal light from the first optical switch array in the second direction, and converging the sub-wavelength false light from the first mirror group. The fifth lens is used for converging the sub-wavelength signal light and the sub-wavelength false light from the fourth lens in the first direction. The sixth lens is used to collimate the sub-wavelength signal light and the sub-wavelength false light from the fifth lens in the second direction and direct them to the second optical switch array. Through the foregoing manner, a specific implementation manner of the second mirror group is provided, which improves the feasibility of the solution.
在一些可能的实施方式中,第三镜组包括第七透镜和第八透镜。第七透镜用于在第二方向上对来自第二光开关阵列的子波长信号光进行汇聚,并对来自第二光开关阵列的子波长假光进行汇聚。第八透镜用于对来自第七透镜的子波长信号光和子波长假光进行光束整形。通过上述方式,提供了一种第三镜组的具体实现方式,提高了本方案的可实现性。In some possible implementation manners, the third lens group includes a seventh lens and an eighth lens. The seventh lens is used for converging the sub-wavelength signal light from the second optical switch array in the second direction, and converging the sub-wavelength false light from the second optical switch array. The eighth lens is used for beam shaping the sub-wavelength signal light and sub-wavelength dummy light from the seventh lens. Through the foregoing manner, a specific implementation manner of the third lens group is provided, which improves the feasibility of the solution.
在一些可能的实施方式中,第一光开关阵列为硅基液晶(Liquid Crystal on Silicon,LCOS),第二光开关阵列为数字光处理器(Digital Light Processer,DLP)。应理解,LCOS可以支持任意偏转方向的调节,应用场景更广。DLP通常只支持两个偏转方向,可以更快速地实现偏振方向切换。In some possible implementation manners, the first optical switch array is liquid crystal on silicon (Liquid Crystal on Silicon, LCOS), and the second optical switch array is digital light processor (Digital Light Processer, DLP). It should be understood that the LCOS can support the adjustment of any deflection direction, and has wider application scenarios. DLP usually only supports two deflection directions, which can realize polarization direction switching more quickly.
在一些可能的实施方式中,WSS还包括控制器,第一光开关阵列和第二光开关阵列由控制器进行控制,便于根据实际情况控制第一光开关阵列进行波长选择,以及根据实际情况控制第二光开关阵列对相同波长的子波长信号光和子波长假光进行二选一。In some possible implementations, the WSS also includes a controller, and the first optical switch array and the second optical switch array are controlled by the controller, so as to control the first optical switch array to perform wavelength selection according to actual conditions, and to control The second optical switch array selects one of the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength.
第二方面,本申请提供了一种波长选择开关。该波长选择开关包括:信号光输入端口、假光输入端口、输出端口、第一色散元件、第二色散元件、光开关阵列、第一偏振转换装置、第二偏振转换装置、偏振合束器、偏振转换阵列、偏振分离器、第一镜组、第二镜组和第三镜组。其中,信号光输入端口和假光输入端口沿第一方向分布。In a second aspect, the present application provides a wavelength selective switch. The wavelength selective switch includes: a signal light input port, a dummy light input port, an output port, a first dispersion element, a second dispersion element, an optical switch array, a first polarization conversion device, a second polarization conversion device, a polarization beam combiner, A polarization conversion array, a polarization splitter, a first mirror group, a second mirror group and a third mirror group. Wherein, the signal light input ports and the dummy light input ports are distributed along the first direction.
第一偏振转换装置用于将来自信号光输入端口的信号光转换为第一偏振态。第二偏振转换装置用于将来自假光输入端口的假光转换为第二偏振态。其中,第一偏振态与第二偏振态相互正交。第一色散元件用于在第二方向上将来自第一偏振转换装置的信号光分解为多个子波长信号光,并在第二方向上将来自第二偏振转换装置的假光分解为多个子波长假光。其中,第二方向与第一方向垂直。第一镜组用于在第二方向上对多个子波长信号光和多个子波长假光进行准直。光开关阵列用于调节来自第一透镜的多个子波长信号光的偏转方向。第二镜组用于将来自光开关阵列的子波长信号光和来自第一镜组的子波长假光导向偏振合束器。偏振合束器用于对来自第二镜组的子波长信号光和子波长假光进行合路,并将合路后的子波长信号光和子波长假光导向偏振转换阵列。其中,相同波长的子波长信号光和子波长假光在偏振转换阵列上的入射位置相同。偏振转换阵列用于调节每个入射位置处入射光的偏振态,以选 择从偏振转换阵列输出的每个子波长信号光的偏振态和每个子波长假光的偏振态。其中,从偏振转换阵列输出的相同波长的子波长信号光和子波长假光的偏振态不同。偏振分离器用于透射来自偏振转换阵列的具有第一偏振态的子波长信号光和/或子波长假光,并反射来自偏振转换阵列的具有第二偏振态的子波长信号光和/或子波长假光。第三镜组用于在第二方向上对偏振分离器透射的子波长信号光和/或子波长假光进行汇聚。第二色散元件用于对来自第三镜组的子波长信号光和/或子波长假光进行合波,并将合波后的光导向输出端口。The first polarization conversion device is used for converting the signal light from the signal light input port into a first polarization state. The second polarization conversion device is used for converting the dummy light from the dummy light input port into a second polarization state. Wherein, the first polarization state and the second polarization state are orthogonal to each other. The first dispersion element is used to decompose the signal light from the first polarization conversion device into multiple sub-wavelength signal lights in the second direction, and decompose the spurious light from the second polarization conversion device into multiple sub-wavelengths in the second direction Holiday light. Wherein, the second direction is perpendicular to the first direction. The first lens group is used for collimating multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the second direction. The optical switch array is used to adjust the deflection directions of the multiple sub-wavelength signal lights from the first lens. The second mirror group is used to guide the sub-wavelength signal light from the optical switch array and the sub-wavelength false light from the first mirror group to the polarization beam combiner. The polarization beam combiner is used to combine the sub-wavelength signal light and sub-wavelength dummy light from the second mirror group, and guide the combined sub-wavelength signal light and sub-wavelength dummy light to the polarization conversion array. Wherein, the incident positions of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength on the polarization conversion array are the same. The polarization conversion array is used to adjust the polarization state of the incident light at each incident position, so as to select the polarization state of each sub-wavelength signal light and the polarization state of each sub-wavelength false light output from the polarization conversion array. Wherein, the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength output from the polarization conversion array have different polarization states. The polarization splitter is used to transmit the sub-wavelength signal light and/or sub-wavelength dummy light with the first polarization state from the polarization conversion array, and reflect the sub-wavelength signal light and/or sub-wavelength with the second polarization state from the polarization conversion array Holiday light. The third mirror group is used for converging the sub-wavelength signal light and/or the sub-wavelength false light transmitted by the polarization splitter in the second direction. The second dispersion element is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the third mirror group, and directing the multiplexed light to the output port.
在该实施方式中,即使某个波长的信号光在传输过程中掉波,也可以通过偏振转换阵列和偏转分离器选择该波长的假光来实现上载假光,以填充掉波的信号光的信道,从而保持满波状态,SRS效应稳定,提高了信号传输的稳定性。另外,采用偏振转换阵列只需要对入射光在两个偏振态之间进行转换,调节速度更快,可以实现快速上载信号光和假光。In this embodiment, even if the signal light of a certain wavelength is dropped during the transmission process, the false light of this wavelength can be selected through the polarization conversion array and the deflection splitter to upload the false light to fill the space of the wave-dropped signal light. Channel, so as to maintain a full wave state, the SRS effect is stable, and the stability of signal transmission is improved. In addition, the use of the polarization conversion array only needs to convert the incident light between two polarization states, the adjustment speed is faster, and the signal light and false light can be uploaded quickly.
在一些可能的实施方式中,若偏振转换阵列上第一入射位置处入射的第一子波长信号光的能量衰减大于或等于预设值,则第一入射位置处入射的第一子波长假光经过偏振转换阵列后具有第一偏振态,第一子波长信号光经过偏振转换阵列后具有第二偏振态。若第二光开关阵列上第一入射位置处入射的第一子波长信号光的能量衰减小于预设值,则第一子波长假光经过偏振转换阵列后具有第二偏振态,第一子波长信号光经过偏振转换阵列后具有第一偏振态。In some possible implementations, if the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the polarization conversion array is greater than or equal to a preset value, the first sub-wavelength false light incident at the first incident position After passing through the polarization conversion array, it has a first polarization state, and the first sub-wavelength signal light has a second polarization state after passing through the polarization conversion array. If the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is less than the preset value, the first sub-wavelength false light has a second polarization state after passing through the polarization conversion array, and the first sub-wavelength The signal light has a first polarization state after passing through the polarization conversion array.
在该实施方式中,通过检测偏振转换阵列上入射的子波长信号光的能量可以合理地对相同波长的子波长信号光和子波长假光进行选择,使得正常传输的子波长信号光仍能继续传输,对于非正常传输的子波长信号光可以通过上载子波长假光以保证经过WSS后的光处于满波状态。In this embodiment, by detecting the energy of the sub-wavelength signal light incident on the polarization conversion array, the sub-wavelength signal light and sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still continue to transmit , for abnormally transmitted sub-wavelength signal light, sub-wavelength false light can be uploaded to ensure that the light after passing through the WSS is in a full-wave state.
在一些可能的实施方式中,来自第一镜组的多个子波长假光经过光开关阵列传输至第二镜组。也就是说,光开关阵列也可以调节入射的子波长假光的偏转方向,扩展了本方案的应用场景。In some possible implementation manners, the multiple sub-wavelength false lights from the first mirror group are transmitted to the second mirror group through the optical switch array. That is to say, the optical switch array can also adjust the deflection direction of the incident sub-wavelength false light, which expands the application scenarios of this solution.
在一些可能的实施方式中,光开关阵列还用于调节来自第一镜组的第二子波长假光的偏转方向,其中,偏转方向调节后的第二子波长假光不导向偏振合束器。偏振转换阵列用于调节来自偏振合束器的第二子波长信号光的偏振态,以衰减第二子波长信号光向输出端口传输的能量。其中,第二子波长假光与第二子波长信号光的波长相同。在该实施方式中,通过偏振转换阵列对第二子波长信号光进行衰减之前,还需要先通过光开关阵列阻断第二子波长假光,以避免在对第二子波长信号光进行衰减的同时增强第二子波长假光,保证了衰减效果。In some possible implementations, the optical switch array is also used to adjust the deflection direction of the second sub-wavelength false light from the first mirror group, wherein the second sub-wavelength false light after the deflection direction is adjusted is not guided to the polarization beam combiner . The polarization conversion array is used to adjust the polarization state of the second sub-wavelength signal light from the polarization beam combiner, so as to attenuate the energy of the second sub-wavelength signal light transmitted to the output port. Wherein, the wavelength of the second sub-wavelength dummy light is the same as that of the second sub-wavelength signal light. In this embodiment, before the second sub-wavelength signal light is attenuated by the polarization conversion array, the second sub-wavelength false light needs to be blocked by the optical switch array to avoid the second sub-wavelength signal light being attenuated. At the same time, the false light of the second sub-wavelength is enhanced to ensure the attenuation effect.
在一些可能的实施方式中,第三子波长信号光经过光开关阵列调节偏转方向后不导向偏振合束器。偏振转换阵列用于调节来自偏振合束器的第三子波长假光的偏振态,以衰减第三子波长假光向输出端口传输的能量。其中,第三子波长假光与第三子波长信号光的波长相同。在该实施方式中,通过偏振转换阵列对第三子波长假光进行衰减之前,还需要先通过光开关阵列阻断第三子波长信号光,以避免在对第三子波长假光进行衰减的同时增强第三子波长信号光,保证了衰减效果。In some possible implementation manners, the signal light of the third sub-wavelength is not guided to the polarization beam combiner after the deflection direction is adjusted by the optical switch array. The polarization conversion array is used to adjust the polarization state of the third sub-wavelength dummy light from the polarization beam combiner, so as to attenuate the energy transmitted to the output port by the third sub-wavelength dummy light. Wherein, the third sub-wavelength dummy light has the same wavelength as the third sub-wavelength signal light. In this embodiment, before the third sub-wavelength false light is attenuated by the polarization conversion array, the third sub-wavelength signal light needs to be blocked by the optical switch array, so as to avoid the attenuation of the third sub-wavelength false light At the same time, the third sub-wavelength signal light is enhanced to ensure the attenuation effect.
在一些可能的实施方式中,WSS还包括第四镜组和第五镜组。第四镜组用于对来自信号 光输入端口的信号光先进行准直和光束整形再导向第一偏振转换装置,并对来自假光输入端口的假光先进行准直和光束整形再导向第一偏振转换装置。第五镜组用于对来自第二色散元件的合波后的光先进行准直和光束整形再导向输出端口。通过上述方式,在色散之前和合波之后还可以对光进行准直和光束整形,增强了本方案的实用性。In some possible implementation manners, the WSS further includes a fourth mirror group and a fifth mirror group. The fourth mirror group is used to collimate and beam-shape the signal light from the signal light input port before guiding it to the first polarization conversion device, and to collimate and beam-shape the false light from the false light input port before guiding it to the first polarization conversion device. A polarization conversion device. The fifth mirror group is used to collimate and shape the combined light from the second dispersive element before guiding it to the output port. Through the above method, the light can also be collimated and beam shaped before the dispersion and after the multiplexing, which enhances the practicability of the solution.
在一些可能的实施方式中,第一镜组包括第一透镜、第二透镜和第三透镜。第一透镜用于透射来自第一色散元件的多个子波长信号光,或者,在第一方向上对来自第一色散元件的多个子波长信号光进行折射。第二透镜用于透射来自第一色散元件的多个子波长假光,或者,在第一方向上对来自第一色散元件的多个子波长假光进行折射。第三透镜用于在第二方向上对来自第一透镜的多个子波长信号光进行准直,并对来自第二透镜的多个子波长假光进行准直。通过上述方式,提供了一种第一镜组的具体实现方式,提高了本方案的可实现性。在具有多个信号光输入端口的场景中,可以通过第一透镜将多路信号光聚焦到光开关阵列在第一方向上的相同位置,通过第二透镜可以将假光导向光开关阵列在第一方向上的其他位置。In some possible implementation manners, the first lens group includes a first lens, a second lens and a third lens. The first lens is used to transmit the multiple sub-wavelength signal lights from the first dispersive element, or refract the multiple sub-wavelength signal lights from the first dispersive element in the first direction. The second lens is used for transmitting the multiple sub-wavelength false lights from the first dispersion element, or refracting the multiple sub-wavelength false lights from the first dispersion element in the first direction. The third lens is used for collimating the multiple sub-wavelength signal lights from the first lens in the second direction, and collimating the multiple sub-wavelength false lights from the second lens. Through the foregoing manner, a specific implementation manner of the first mirror group is provided, which improves the feasibility of the solution. In a scene with multiple signal light input ports, multiple signal lights can be focused to the same position of the optical switch array in the first direction through the first lens, and false light can be directed to the optical switch array through the second lens. the other in one direction.
在一些可能的实施方式中,第二镜组包括第四透镜、第五透镜、第六透镜、第七透镜和反射镜。第四透镜用于在第二方向上对来自光开关阵列的子波长信号光进行汇聚,并对来自第一镜组的子波长假光进行汇聚。第五透镜用于对来自第四透镜的子波长信号光进行光束整形。第六透镜用于在第二方向上对来自第五透镜的子波长信号光进行准直并导向偏振合束器。第七透镜用于对来自第四透镜的子波长假光进行光束整形。反射镜用于将来自第七透镜的子波长假光反射至偏振合束器。通过上述方式,提供了一种第二镜组的具体实现方式,提高了本方案的可实现性。In some possible implementation manners, the second lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens and a reflection mirror. The fourth lens is used for converging the sub-wavelength signal light from the optical switch array in the second direction, and converging the sub-wavelength false light from the first lens group. The fifth lens is used for beam shaping the sub-wavelength signal light from the fourth lens. The sixth lens is used to collimate the sub-wavelength signal light from the fifth lens in the second direction and guide it to the polarization beam combiner. The seventh lens is used for beam shaping the sub-wavelength false light from the fourth lens. The mirror is used to reflect the sub-wavelength false light from the seventh lens to the polarization beam combiner. Through the foregoing manner, a specific implementation manner of the second mirror group is provided, which improves the feasibility of the solution.
在一些可能的实施方式中,第三镜组包括第八透镜和第九透镜。第八透镜用于在第二方向上对来自偏振分离器的子波长信号光进行汇聚,并对来自偏振分离器的子波长假光进行汇聚。第九透镜用于对来自第八透镜的子波长信号光和子波长假光进行光束整形。通过上述方式,提供了一种第三镜组的具体实现方式,提高了本方案的可实现性。In some possible implementation manners, the third lens group includes an eighth lens and a ninth lens. The eighth lens is used for converging the sub-wavelength signal light from the polarization splitter in the second direction, and converging the sub-wavelength false light from the polarization splitter. The ninth lens is used for beam shaping the sub-wavelength signal light and sub-wavelength dummy light from the eighth lens. Through the foregoing manner, a specific implementation manner of the third lens group is provided, which improves the feasibility of the solution.
在一些可能的实施方式中,光开关阵列为LCOS,偏振转换阵列为硅基铁电液晶(Ferroelectric Liquid Crystal on Silicon,F-LCOS)。应理解,LCOS可以支持任意偏转方向的调节,应用场景更广。F-LCOS通常只支持两个偏振态,可以更快速地实现偏振态切换。In some possible implementation manners, the optical switch array is LCOS, and the polarization conversion array is Ferroelectric Liquid Crystal on Silicon (F-LCOS). It should be understood that the LCOS can support the adjustment of any deflection direction, and has wider application scenarios. F-LCOS usually only supports two polarization states, which can achieve faster polarization state switching.
在一些可能的实施方式中,WSS还包括控制器,光开关阵列和偏振转换阵列由控制器进行控制,便于根据实际情况控制光开关阵列进行波长选择,以及根据实际情况控制偏振转换阵列调节入射光的偏振态,并结合偏振分离器对相同波长的子波长信号光和子波长假光进行二选一。In some possible implementations, the WSS also includes a controller, and the optical switch array and the polarization conversion array are controlled by the controller, so as to control the optical switch array to perform wavelength selection according to the actual situation, and control the polarization conversion array to adjust the incident light according to the actual situation. polarization state, and combine the polarization separator to select one of the sub-wavelength signal light and sub-wavelength false light of the same wavelength.
本申请实施例中,WSS具有信号光输入端口和假光输入端口,其中,假光为不承载信息的光束。信号光和假光经过色散元件后会发生色散,从而分解为多个子波长信号光和多个子波长假光。第一光开关阵列的作用是调节多个子波长信号光的偏转方向,以选择出向第二光开关阵列传输的子波长信号光。相同波长的子波长信号光和子波长假光在第二光开关阵列上的入射位置相同,第二光开关阵列的作用是调节每个入射位置处入射光的偏转方向,从而对每个波长的子波长信号光和子波长假光进行二选一,被选中的子波长信号光或子波长假光可以向输出端口传输。通过这种方式,即使某个波长的信号光在传输过程中掉波,也可以通过 第二光开关阵列选择该波长的假光来实现上载假光,以填充掉波的信号光的信道,从而保持满波状态,SRS效应稳定,提高了信号传输的稳定性。另外,采用第二光开关阵列只需要在两个输出方向上进行切换即可,调节速度更快,可以实现快速上载信号光和假光。In the embodiment of the present application, the WSS has a signal light input port and a dummy light input port, wherein the dummy light is a light beam that does not carry information. The signal light and false light will be dispersed after passing through the dispersive element, thereby decomposing into multiple sub-wavelength signal light and multiple sub-wavelength false light. The function of the first optical switch array is to adjust the deflection direction of multiple sub-wavelength signal lights to select the sub-wavelength signal light to be transmitted to the second optical switch array. The sub-wavelength signal light of the same wavelength and the sub-wavelength false light have the same incident position on the second optical switch array, and the function of the second optical switch array is to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength of each wavelength The wavelength signal light and the sub-wavelength dummy light are selected, and the selected sub-wavelength signal light or sub-wavelength dummy light can be transmitted to the output port. In this way, even if the signal light of a certain wavelength drops during transmission, the false light of this wavelength can be selected by the second optical switch array to upload the false light to fill the channel of the wave-dropped signal light, thereby Keep the full wave state, the SRS effect is stable, and the stability of signal transmission is improved. In addition, the second optical switch array only needs to switch in two output directions, the adjustment speed is faster, and the fast uploading of signal light and false light can be realized.
图1为本申请实施例应用的一种光传输***示意图;FIG. 1 is a schematic diagram of an optical transmission system applied in an embodiment of the present application;
图2(a)为本申请实施例中WSS在色散方向的第一种光路示意图;Fig. 2 (a) is the schematic diagram of the first optical path of WSS in the dispersion direction in the embodiment of the present application;
图2(b)为本申请实施例中WSS在端口方向的第一种光路示意图;Fig. 2 (b) is the schematic diagram of the first optical path of the WSS in the port direction in the embodiment of the present application;
图3(a)为第一光开关阵列上子波长信号光和子波长假光的光斑分布示意图;Fig. 3 (a) is the light spot distribution schematic diagram of sub-wavelength signal light and sub-wavelength false light on the first optical switch array;
图3(b)为第二光开关阵列上子波长信号光和子波长假光的光斑分布示意图;Fig. 3 (b) is the spot distribution schematic diagram of sub-wavelength signal light and sub-wavelength false light on the second optical switch array;
图4(a)为本申请实施例中WSS在色散方向的第二种光路示意图;Figure 4(a) is a schematic diagram of the second optical path of WSS in the dispersion direction in the embodiment of the present application;
图4(b)为本申请实施例中WSS在端口方向的第二种光路示意图;Figure 4(b) is a schematic diagram of the second optical path of the WSS in the port direction in the embodiment of the present application;
图5(a)为本申请实施例中WSS在色散方向的第三种光路示意图;Figure 5(a) is a schematic diagram of the third optical path of the WSS in the dispersion direction in the embodiment of the present application;
图5(b)为本申请实施例中WSS在端口方向的第三种光路示意图;Figure 5(b) is a schematic diagram of the third optical path of the WSS in the port direction in the embodiment of the present application;
图6(a)为本申请实施例中WSS在色散方向的第四种光路示意图;Fig. 6 (a) is the schematic diagram of the fourth optical path of WSS in the dispersion direction in the embodiment of the present application;
图6(b)为本申请实施例中WSS在端口方向的第四种光路示意图。FIG. 6( b ) is a schematic diagram of a fourth optical path of the WSS in the port direction in the embodiment of the present application.
本申请实施例提供了一种波长选择开关(Wavelength Selective Switch,WSS),可以通过快速上载假光以填充掉波的信号光的信道,从而保持满波状态,SRS效应稳定,提高了信号传输的稳定性。本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象,而不必用于描述特定的顺序或先后次序。应该理解这样使用的术语在适当情况下可以互换,这仅仅是描述本申请的实施例中对相同属性的对象在描述时所采用的区分方式。此外,术语“包括”和“具有”以及他们的任何变形,意图在于覆盖不排他的包含,以便包含一系列单元的过程、方法、***、产品或设备不必限于那些单元,而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它单元。The embodiment of the present application provides a wavelength selective switch (Wavelength Selective Switch, WSS), which can quickly upload false light to fill the channel of the wave-dropped signal light, thereby maintaining the full-wave state, the SRS effect is stable, and the efficiency of signal transmission is improved. stability. The terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, and this is merely a description of the manner in which objects with the same attribute are described in the embodiments of the present application. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, product, or apparatus comprising a series of elements is not necessarily limited to those elements, but may include elements not expressly included. Other elements listed explicitly or inherent to the process, method, product, or apparatus.
图1为本申请实施例应用的一种光传输***示意图。如图1所示,该光传输***包括光放大器1、光放大器2、波长选择开关1、波长选择开关2、上下波长选择开关(Add Drop WSS,ADWSS)1和上下波长选择开关2。应理解,为了保证SRS效应稳定应使得信道处于满波状态。信道上传输的光可以包括信号光和假光,其中,假光为不承载信号的光。也就是说,部分没有传输信号光的空闲信道可以通过假光填充。作为一个示例,经过光放大器1的光为满波状态,其中,信号光的波长是λ1-λ4,假光的波长是λ5和λ6。满波的光经过波长选择开关1后,波长λ1的信号光被下载到上下波长选择开关1。并且,波长λ5和波长λ6的假光被波长选择开关1阻断,上下波长选择开关2再将波长λ5和波长λ6的信号光上载到波长选择开关2。进而,波长选择开关2还将上载波长λ1的假光,以使得从波长选择开关2输出 到光放大器2的光仍为满波状态。FIG. 1 is a schematic diagram of an optical transmission system applied in an embodiment of the present application. As shown in Figure 1, the optical transmission system includes an optical amplifier 1, an optical amplifier 2, a wavelength selective switch 1, a wavelength selective switch 2, an upper and lower wavelength selective switch (Add Drop WSS, ADWSS) 1 and an upper and lower wavelength selective switch 2. It should be understood that in order to ensure the stability of the SRS effect, the channel should be in a full-wave state. The light transmitted on the channel may include signal light and false light, wherein the false light is light that does not carry a signal. That is to say, some idle channels that do not transmit signal light can be filled with false light. As an example, the light passing through the optical amplifier 1 is in a full-wave state, wherein the wavelengths of signal light are λ1-λ4, and the wavelengths of dummy light are λ5 and λ6. After the full-wave light passes through the wavelength selective switch 1, the signal light with the wavelength λ1 is downloaded to the upper and lower wavelength selective switch 1. Moreover, the false light of wavelength λ5 and wavelength λ6 is blocked by the wavelength selective switch 1 , and the upper and lower wavelength selective switch 2 uploads the signal light of wavelength λ5 and wavelength λ6 to the wavelength selective switch 2 . Furthermore, the wavelength selective switch 2 will also upload the false light with the wavelength λ1, so that the light output from the wavelength selective switch 2 to the optical amplifier 2 is still in a full-wave state.
通过上述描述,当某些波长的光由于受到激光器光源损坏或光放大器失效等原因的影响突然被动掉波时,需要WSS能够快速上载假光以填充这些掉波信号的信道,最大程度降低光放大器的瞬态效应或者SRS效应带来的信号功率波动和损伤。下面对本申请实施例提供的WSS进行详细介绍。Through the above description, when the light of certain wavelengths is suddenly dropped due to the damage of the laser light source or the failure of the optical amplifier, etc., it is necessary for the WSS to quickly upload false light to fill the channels of these dropped signals and minimize the optical amplifier. Signal power fluctuations and damage caused by transient effects or SRS effects. The WSS provided by the embodiment of the present application is described in detail below.
为了便于介绍,在后面实施例中统一将光的传输方向定义为Z方向,端口的分布方向定义为X方向,光的色散方向定义为Y方向。其中,X方向与Z方向垂直,Y方向与Z方向垂直,X方向与Y方向垂直。另外,本申请不限定信号光输入端口、假光输入端口以及输出端口的数量,附图中展示的数量只是一种示例。For ease of introduction, in the following embodiments, the transmission direction of light is defined as Z direction, the distribution direction of ports is defined as X direction, and the dispersion direction of light is defined as Y direction. Wherein, the X direction is perpendicular to the Z direction, the Y direction is perpendicular to the Z direction, and the X direction is perpendicular to the Y direction. In addition, the present application does not limit the numbers of signal light input ports, dummy light input ports, and output ports, and the numbers shown in the drawings are just examples.
图2(a)为本申请实施例中WSS在色散方向的第一种光路示意图。图2(b)为本申请实施例中WSS在端口方向的第一种光路示意图。如图2(a)和图2(b)所示,该波长选择开关包括:信号光输入端口10、假光输入端口20、第一色散元件30、第一光开关阵列40、第二光开关阵列50、第二色散元件60、输出端口70、镜组1、镜组2和镜组3。其中,信号光输入端口10和假光输入端口20分布在X方向上。可选地,该波长选择开关还可以包括镜组4和镜组5。Fig. 2(a) is a schematic diagram of the first optical path of the WSS in the dispersion direction in the embodiment of the present application. Fig. 2(b) is a schematic diagram of the first optical path of the WSS in the port direction in the embodiment of the present application. As shown in Fig. 2 (a) and Fig. 2 (b), this wavelength selective switch comprises: signal light input port 10, dummy light input port 20, the first dispersion element 30, the first optical switch array 40, the second optical switch Array 50 , second dispersive element 60 , output port 70 , mirror group 1 , mirror group 2 and mirror group 3 . Wherein, the signal light input port 10 and the dummy light input port 20 are distributed in the X direction. Optionally, the wavelength selective switch may also include mirror group 4 and mirror group 5 .
具体地,镜组4用于对来自信号光输入端口10的信号光先进行准直和光束整形后再导向第一色散元件30,并对来自假光输入端口20的假光先进行准直和光束整形后再导向第一色散元件30。第一色散元件30用于在Y方向上将来自信号输入端口10的信号光分解为多个子波长信号光,并在Y方向上将来自假光输入端口20的假光分解为多个子波长假光。其中,多个子波长信号光的波长各不相同,多个子波长假光的波长各不相同。镜组1用于在Y方向上对多个子波长信号光和多个子波长假光进行准直,以将波长方向的角度差异转换为波长方向的位置差异,多个子波长信号光会分别入射到第一光开关阵列40的不同位置,多个子波长假光会分别入射到第一光开关阵列40的不同位置。第一光开关阵列40用于调节入射的多个子波长信号光和多个子波长假光的偏转方向。镜组2用于将来自第一光开关阵列40的多个子波长信号光和多个子波长假光导向第二光开关阵列50,以将端口方向的位置差异转换为端口方向的角度差异。其中,相同波长的子波长信号光和子波长假光在第二光开关阵列50上的入射位置相同,但是入射角度不同。第二光开关阵列50用于调节每个入射位置处入射光的偏转方向,以使得每个波长的子波长信号光或子波长假光向输出端口70传输。相当于通过第二光开关阵列50对每个波长的子波长信号光和子波长假光进行二选一,其中,被选中的子波长信号光或子波长假光向输出端口70传输。镜组3用于在Y方向上对来自第二光开关阵列50的子波长信号光和/或子波长假光进行汇聚。第二色散元件60用于对来自镜组3的子波长信号光和/或子波长假光进行合波。镜组5用于对合波后的光进行光束整形和准直后再导向输出端口70。Specifically, the lens group 4 is used to collimate and beam-shape the signal light from the signal light input port 10 before guiding it to the first dispersion element 30, and to collimate and reshape the false light from the false light input port 20 first. The beam is shaped and then directed to the first dispersive element 30 . The first dispersion element 30 is used to decompose the signal light from the signal input port 10 into multiple sub-wavelength signal lights in the Y direction, and decompose the false light from the false light input port 20 into multiple sub-wavelength false lights in the Y direction . Wherein, the wavelengths of the plurality of sub-wavelength signal lights are different, and the wavelengths of the plurality of sub-wavelength dummy lights are different. The mirror group 1 is used to collimate multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction, so as to convert the angle difference in the wavelength direction into the position difference in the wavelength direction, and the multiple sub-wavelength signal lights will be respectively incident on the first At different positions of an optical switch array 40 , multiple sub-wavelength false lights are respectively incident on different positions of the first optical switch array 40 . The first optical switch array 40 is used to adjust the deflection directions of the incident multiple sub-wavelength signal lights and multiple sub-wavelength dummy lights. The mirror group 2 is used to guide multiple sub-wavelength signal lights and multiple sub-wavelength dummy lights from the first optical switch array 40 to the second optical switch array 50 to convert positional differences in port directions into angular differences in port directions. Wherein, the incident positions of the sub-wavelength signal light and the sub-wavelength false light of the same wavelength on the second optical switch array 50 are the same, but the incident angles are different. The second optical switch array 50 is used to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength signal light or sub-wavelength dummy light of each wavelength is transmitted to the output port 70 . It is equivalent to selecting one of the sub-wavelength signal light and the sub-wavelength dummy light of each wavelength through the second optical switch array 50 , wherein the selected sub-wavelength signal light or sub-wavelength dummy light is transmitted to the output port 70 . The mirror group 3 is used to converge the sub-wavelength signal light and/or sub-wavelength dummy light from the second optical switch array 50 in the Y direction. The second dispersion element 60 is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the mirror group 3 . The mirror group 5 is used to shape and collimate the beams of the multiplexed light and guide it to the output port 70 .
图3(a)为第一光开关阵列上子波长信号光和子波长假光的光斑分布示意图。图3(b)为第二光开关阵列上子波长信号光和子波长假光的光斑分布示意图。如图3(a)所示,实线所示的光斑为子波长信号光的光斑,虚线所示的光斑为子波长假光的光斑。各子波长信号光的光斑和各子波长假光的光斑都沿着Y方向排列。并且,在第一光开关阵列40上,相同波长 的子波长信号光的光斑和子波长假光的光斑具有位置偏差。如图3(b)所示,在第二光开关阵列50上,相同波长的子波长信号光的光斑和子波长假光的光斑是有重叠的。应理解,在实际应用中,相同波长的子波长信号光的光斑和子波长假光的光斑完全重合或部分重叠都可以视为在第二光开关阵列50上的入射位置相同。Fig. 3(a) is a schematic diagram of spot distribution of sub-wavelength signal light and sub-wavelength false light on the first optical switch array. Fig. 3(b) is a schematic diagram of spot distribution of sub-wavelength signal light and sub-wavelength false light on the second optical switch array. As shown in FIG. 3( a ), the light spot shown by the solid line is the light spot of the sub-wavelength signal light, and the light spot shown by the dotted line is the light spot of the sub-wavelength false light. The light spots of each sub-wavelength signal light and the light spots of each sub-wavelength dummy light are arranged along the Y direction. In addition, on the first optical switch array 40, the spot of sub-wavelength signal light of the same wavelength and the spot of sub-wavelength dummy light have a positional deviation. As shown in FIG. 3( b ), on the second optical switch array 50 , the light spots of sub-wavelength signal light of the same wavelength and the light spots of sub-wavelength false light overlap. It should be understood that, in practical applications, completely or partially overlapped light spots of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength can be regarded as having the same incident position on the second optical switch array 50 .
需要说明的是,上述的第一光开关阵列40和第二光开关阵列50都由控制器(图中未示出)进行控制。控制器通过控制第一光开关阵列40实现波长选择功能,即第一光开关阵列40可以通过调节入射光的偏转方向让指定波长的子波长信号光和/或子波长假光导向第二光开关阵列50。控制器通过控制第二光开关阵列50实现对子波长信号光和子波长假光的选择,即第二光开关阵列50可以通过调节入射光的偏转方向对相同波长的子波长信号光和子波长假光进行二选一。应理解,第一光开关阵列40具备任意偏转方向的调节能力,而第二光开关阵列50可以只在两个偏转方向上进行切换。因此,第二光开关阵列50相对于第一光开关阵列40调节速度更快,可以实现快速上载信号光和假光。作为一个示例,对于相同波长的子波长信号光和子波长假光来说,若第二光开关阵列50不改变入射光的偏转方向,则子波长信号光向输出端口70传输;若第二光开关阵列50改变入射光的偏转方向,则子波长假光向输出端口70传输。It should be noted that, both the above-mentioned first optical switch array 40 and the second optical switch array 50 are controlled by a controller (not shown in the figure). The controller realizes the wavelength selection function by controlling the first optical switch array 40, that is, the first optical switch array 40 can guide the sub-wavelength signal light and/or sub-wavelength false light of a specified wavelength to the second optical switch by adjusting the deflection direction of the incident light Array 50. The controller realizes the selection of sub-wavelength signal light and sub-wavelength false light by controlling the second optical switch array 50, that is, the second optical switch array 50 can adjust the sub-wavelength signal light and sub-wavelength false light of the same wavelength by adjusting the deflection direction of the incident light Choose one of the two. It should be understood that the first optical switch array 40 has the ability to adjust any deflection direction, while the second optical switch array 50 can only switch in two deflection directions. Therefore, the adjustment speed of the second optical switch array 50 is faster than that of the first optical switch array 40, and can realize fast uploading of signal light and false light. As an example, for sub-wavelength signal light and sub-wavelength false light of the same wavelength, if the second optical switch array 50 does not change the deflection direction of the incident light, then the sub-wavelength signal light is transmitted to the output port 70; The array 50 changes the deflection direction of the incident light, and then the sub-wavelength false light is transmitted to the output port 70 .
在一些可能的实施方式中,若相同波长的子波长信号光和子波长假光都入射到第二光开关阵列50,第二光开关阵列50会选择传输子波长信号光,即子波长信号光通过第二光开关阵列50向输出端口70传输。若子波长信号光没有入射到第二光开关阵列50或者子波长信号光的能量衰减较大,第二光开关阵列50会选择传输相同波长的子波长假光,即子波长假光通过第二光开关阵列50向输出端口70传输。作为一个示例,可以通过光性能检测(Optical Performance Monitoring,OPM)装置对第二光开关阵列50上入射的子波长信号光的能量进行检测。假设第二光开关阵列50上第一入射位置处入射的第一子波长信号光的能量衰减大于或等于预设值,则第二光开关阵列50选择上载与第一子波长信号光波长相同的第一子波长假光。反之,第二光开关阵列50选择上载第一子波长信号光。其中,该预设值具体以实际应用为准,例如5dB,此处不做限定。应理解,通过检测第二光开关阵列50上入射的子波长信号光的能量可以合理地对相同波长的子波长信号光和子波长假光进行选择,使得正常传输的子波长信号光仍能继续传输,对于非正常传输的子波长信号光可以通过上载子波长假光以保证经过WSS后的光处于满波状态。In some possible implementations, if both the sub-wavelength signal light and the sub-wavelength false light of the same wavelength are incident on the second optical switch array 50, the second optical switch array 50 will select to transmit the sub-wavelength signal light, that is, the sub-wavelength signal light passes through The second optical switch array 50 transmits to the output port 70 . If the sub-wavelength signal light is not incident on the second optical switch array 50 or the energy attenuation of the sub-wavelength signal light is large, the second optical switch array 50 will choose to transmit the sub-wavelength false light of the same wavelength, that is, the sub-wavelength false light passes through the second light Switch array 50 transmits to output port 70 . As an example, the energy of the sub-wavelength signal light incident on the second optical switch array 50 may be detected by an optical performance monitoring (Optical Performance Monitoring, OPM) device. Assuming that the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array 50 is greater than or equal to the preset value, the second optical switch array 50 selects to upload the light with the same wavelength as the first sub-wavelength signal light. First sub-wavelength false light. On the contrary, the second optical switch array 50 selects to upload the first sub-wavelength signal light. Wherein, the preset value is subject to actual application, for example, 5dB, which is not limited here. It should be understood that by detecting the energy of the incident sub-wavelength signal light on the second optical switch array 50, the sub-wavelength signal light and sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still continue to transmit , for abnormally transmitted sub-wavelength signal light, sub-wavelength false light can be uploaded to ensure that the light after passing through the WSS is in a full-wave state.
需要说明的是,本申请不限定第一光开关阵列40和第二光开关阵列50的具体类型。作为一个示例,第一光开关阵列40采用硅基液晶(Liquid Crystal on Silicon,LCOS),第二光开关阵列50采用数字光处理器(Digital Light Processer,DLP)。应理解,DLP也可以称之为数字微镜装置(Digital Micromirror Device,DMD)。本申请也不限定第一色散元件30和第二色散元件60的具体类型。作为一个示例,第一色散元件30和第二色散元件60可以采用光栅、衍射光学元件(Difractive Optical Element,DOE)或超表面元件等。It should be noted that, the present application does not limit the specific types of the first optical switch array 40 and the second optical switch array 50 . As an example, the first optical switch array 40 adopts liquid crystal on silicon (Liquid Crystal on Silicon, LCOS), and the second optical switch array 50 adopts digital light processor (Digital Light Processer, DLP). It should be understood that the DLP may also be called a digital micromirror device (Digital Micromirror Device, DMD). The present application also does not limit the specific types of the first dispersion element 30 and the second dispersion element 60 . As an example, the first dispersive element 30 and the second dispersive element 60 may be gratings, diffractive optical elements (Difractive Optical Element, DOE) or metasurface elements.
在一些可能的实施方式中,还可以利用上述图2(a)和图2(b)所示的WSS对子波长信号光或子波长假光进行衰减。应理解,具体通过第二光开关阵列50调节子波长信号光或子波长假光的偏转方向进行衰减。并且,对子波长信号光进行衰减之前,还需要让相同波长的子 波长假光不入射到第二光开关阵列50。因为,如果相同波长的子波长信号光和子波长假光都入射到第二光开关阵列50,对子波长信号光进行衰减的同时会增强子波长假光,影响对子波长信号光的衰减效果。也就是说,通过第二光开关阵列50减少了一部分向输出端口70传输的子波长信号光,就会相应增加一部分向输出端口70传输的子波长假光,二者是此消彼长的关系。同理,对子波长假光进行衰减之前,还需要让相同波长的子波长信号光不入射到第二光开关阵列50。下面具体实施方式分别进行介绍。In some possible implementation manners, the WSS shown in FIG. 2( a ) and FIG. 2( b ) may also be used to attenuate sub-wavelength signal light or sub-wavelength false light. It should be understood that the deflection direction of the sub-wavelength signal light or the sub-wavelength false light is specifically adjusted by the second optical switch array 50 to perform attenuation. In addition, before attenuating the sub-wavelength signal light, it is also necessary to prevent the sub-wavelength false light of the same wavelength from entering the second optical switch array 50. Because, if both the sub-wavelength signal light and the sub-wavelength false light of the same wavelength are incident on the second optical switch array 50, the sub-wavelength false light will be enhanced while the sub-wavelength signal light is attenuated, affecting the attenuation effect on the sub-wavelength signal light. That is to say, if the second optical switch array 50 reduces a part of the sub-wavelength signal light transmitted to the output port 70, a part of the sub-wavelength false light transmitted to the output port 70 will be correspondingly increased, and the two are in a trade-off relationship. . Similarly, before attenuating sub-wavelength false light, it is also necessary to prevent sub-wavelength signal light of the same wavelength from entering the second optical switch array 50 . The following specific implementation methods will be introduced respectively.
实施方式1:衰减子波长信号光。Embodiment 1: Attenuation of sub-wavelength signal light.
第一光开关阵列40调节入射的第二子波长假光的偏转方向,以使得第二子波长假光不导向第二光开关阵列50。第二光开关阵列50调节入射的第二子波长信号光的偏转方向,以衰减第二子波长信号光向输出端口70传输的能量。其中,第二子波长信号光与第二子波长假光的波长相同。The first optical switch array 40 adjusts the deflection direction of the incident second sub-wavelength dummy light so that the second sub-wavelength dummy light does not guide to the second optical switch array 50 . The second optical switch array 50 adjusts the deflection direction of the incident second sub-wavelength signal light to attenuate the energy transmitted to the output port 70 by the second sub-wavelength signal light. Wherein, the wavelength of the second sub-wavelength signal light is the same as that of the second sub-wavelength dummy light.
实施方式2:衰减子波长假光。Embodiment 2: Attenuating sub-wavelength false light.
第一光开关阵列40调节入射的第三子波长信号光的偏转方向,以使得第三子波长信号光不导向第二光开关阵列50。第二光开关阵列50调节第三子波长假光的偏转方向,以衰减第三子波长假光向输出端口70传输的能量。其中,第三子波长信号光与第三子波长假光的波长相同。The first optical switch array 40 adjusts the deflection direction of the incident third sub-wavelength signal light so that the third sub-wavelength signal light does not guide to the second optical switch array 50 . The second optical switch array 50 adjusts the deflection direction of the third sub-wavelength dummy light to attenuate the energy transmitted to the output port 70 by the third sub-wavelength dummy light. Wherein, the third sub-wavelength signal light and the third sub-wavelength dummy light have the same wavelength.
需要说明的是,本申请不限定上述的镜组1、镜组2、镜组3、镜组4和镜组5的组成方式,下面提供一种具体的实现方式。It should be noted that the present application does not limit the composition of the mirror group 1 , the mirror group 2 , the mirror group 3 , the mirror group 4 and the mirror group 5 , and a specific implementation is provided below.
如图2(a)和图2(b)所示,镜组1包括透镜1、透镜2和透镜3,镜组2包括透镜4、透镜5和透镜6,镜组3包括透镜7和透镜8,镜组4包括透镜9和透镜10,镜组5包括透镜11和透镜12。具体地,透镜9用于对入射的信号光和假光进行准直,透镜10用于对入射的信号光和假光进行光束整形。透镜1用于在X方向上对来自多个信号光输入端口10的多路子波长信号光进行汇聚,以图2(b)所示的3个信号光输入端口10为例,沿透镜1光轴传输的一路子波长信号光经透镜1透射至第一光开关阵列40,另外两路子波长信号光经透镜1折射至第一光开关阵列40,三路子波长信号光被汇聚到第一光开关阵列40在X方向上的相同位置。透镜2与透镜1的作用类似,用于在X方向上对入射的子波长假光进行透射或折射,使得入射到第一光开关阵列40的子波长假光与子波长信号光在X方向上的入射位置不同。透镜3用于在Y方向上对入射的多个子波长信号光和多个子波长假光进行准直。透镜4用于在Y方向上对入射的子波长信号光进行汇聚并对入射的子波长假光进行汇聚,透镜5用于在X方向上对入射的子波长信号光和子波长假光进行汇聚,透镜6用于在Y方向上对入射的子波长信号光和子波长假光进行准直。透镜7用于在Y方向上对入射的子波长信号光进行汇聚并对入射的子波长假光进行汇聚,透镜8用于对入射的子波长信号光和子波长假光进行光束整形。透镜11用于对经第二色散元件60合波后的光进行光束整形,透镜12用于对合波后的光进行准直。As shown in Figure 2 (a) and Figure 2 (b), mirror group 1 includes lens 1, lens 2 and lens 3, mirror group 2 includes lens 4, lens 5 and lens 6, mirror group 3 includes lens 7 and lens 8 , the mirror group 4 includes a lens 9 and a lens 10 , and the mirror group 5 includes a lens 11 and a lens 12 . Specifically, the lens 9 is used for collimating the incident signal light and false light, and the lens 10 is used for beam shaping the incident signal light and false light. The lens 1 is used to converge the multi-path sub-wavelength signal lights from multiple signal light input ports 10 in the X direction. Taking the three signal light input ports 10 shown in FIG. 2(b) as an example, along the optical axis of the lens 1 The transmitted one-way sub-wavelength signal light is transmitted to the first optical switch array 40 through the lens 1, and the other two-way sub-wavelength signal light is refracted to the first optical switch array 40 through the lens 1, and the three-way sub-wavelength signal light is converged to the first optical switch array 40 at the same position in the X direction. The function of lens 2 is similar to that of lens 1, and is used to transmit or refract the incident sub-wavelength false light in the X direction, so that the sub-wavelength false light and sub-wavelength signal light incident on the first optical switch array 40 are in the X direction. The incidence position is different. The lens 3 is used to collimate the incident multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction. The lens 4 is used to converge the incident sub-wavelength signal light and the incident sub-wavelength false light in the Y direction, and the lens 5 is used to converge the incident sub-wavelength signal light and sub-wavelength false light in the X direction. The lens 6 is used to collimate the incident sub-wavelength signal light and sub-wavelength false light in the Y direction. The lens 7 is used to converge the incident sub-wavelength signal light and the incident sub-wavelength dummy light in the Y direction, and the lens 8 is used to perform beam shaping on the incident sub-wavelength signal light and sub-wavelength dummy light. The lens 11 is used to shape the beam of the light combined by the second dispersion element 60 , and the lens 12 is used to collimate the combined light.
在一种可能的实施方式中,如图2(a)所示,透镜10的前焦面与透镜9的后焦面重合。第一色散元件30位于透镜10的后焦面,且位于透镜3的前焦面。第一光开关阵列40位于透 镜3的后焦面,且位于透镜4的前焦面。透镜4的后焦面与透镜6的前焦面重合。第二光开关阵列50位于透镜6的后焦面,且位于透镜7的前焦面。第二色散元件60位于透镜7的后焦面,且位于透镜11的前焦面。透镜11位于透镜12的前焦面。如图2(b)所示,透镜1与第一色散元件30位置接近,透镜8与第二色散元件60位置接近。透镜1的前焦面与透镜9的后焦面重合。第一光开关阵列40位于透镜1的后焦面。透镜2的前焦面与透镜9的后焦面重合。第一光开关阵列40位于透镜2的后焦面。第一光开关阵列40位于透镜5的前焦面,第二光开关阵列50位于透镜5的后焦面。第二光开关阵列50位于透镜8的前焦面。透镜8的后焦面与透镜12的前焦面重合。In a possible implementation manner, as shown in FIG. 2( a ), the front focal plane of the lens 10 coincides with the back focal plane of the lens 9 . The first dispersion element 30 is located at the rear focal plane of the lens 10 and at the front focal plane of the lens 3 . The first optical switch array 40 is located at the rear focal plane of the lens 3 and at the front focal plane of the lens 4. The rear focal plane of lens 4 coincides with the front focal plane of lens 6 . The second optical switch array 50 is located at the rear focal plane of the lens 6 and at the front focal plane of the lens 7 . The second dispersion element 60 is located at the rear focal plane of the lens 7 and at the front focal plane of the lens 11 . The lens 11 is located at the front focal plane of the lens 12 . As shown in FIG. 2( b ), the lens 1 is close to the first dispersion element 30 , and the lens 8 is close to the second dispersion element 60 . The front focal plane of lens 1 coincides with the back focal plane of lens 9 . The first optical switch array 40 is located on the back focal plane of the lens 1 . The front focal plane of lens 2 coincides with the back focal plane of lens 9 . The first optical switch array 40 is located on the back focal plane of the lens 2 . The first optical switch array 40 is located on the front focal plane of the lens 5 , and the second optical switch array 50 is located on the rear focal plane of the lens 5 . The second optical switch array 50 is located on the front focal plane of the lens 8 . The back focal plane of lens 8 coincides with the front focal plane of lens 12 .
需要说明的是,在上述图2(a)和图2(b)所示WSS的基础上还可以进行变形,使得来自镜组1的多个子波长假光直接传输到镜组2而不经过第一光开关阵列40。下面结合附图进行介绍。It should be noted that, on the basis of the WSS shown in Fig. 2(a) and Fig. 2(b) above, it can also be deformed, so that multiple sub-wavelength false lights from mirror group 1 are directly transmitted to mirror group 2 without passing through the second An optical switch array 40 . Introduce below in conjunction with accompanying drawing.
图4(a)为本申请实施例中WSS在色散方向的第二种光路示意图。图4(b)为本申请实施例中WSS在端口方向的第二种光路示意图。应理解,图4(a)展示的本实施例中假光在色散方向的光路示意图。本实施例中信号光在色散方向的光束示意图与上述图2(a)相同。如图4(a)和图4(b)所示,子波长信号光会经过第一光开关阵列40,而子波长假光不会经过第一光开关阵列40。在该实施例中,第一光开关阵列40无需调节子波长假光的偏转方向,每个子波长假光都会入射到第二光开关阵列50。因此,可以采用尺寸较小的第一光开关阵列40,降低了成本。但是,该实施例无法应用在需要对子波长信号光进行衰减的场景中。应理解,除了上述介绍的区别之外,该实施例与上述图2(a)和图2(b)所示实施例类似,其他相同特征可以参考图2(a)和图2(b)所示实施例的相关描述,此处不再重复介绍。Fig. 4(a) is a schematic diagram of the second optical path of the WSS in the dispersion direction in the embodiment of the present application. Fig. 4(b) is a schematic diagram of the second optical path of the WSS in the port direction in the embodiment of the present application. It should be understood that FIG. 4( a ) shows a schematic diagram of the optical path of the false light in the dispersion direction in this embodiment. The beam schematic diagram of the signal light in the dispersion direction in this embodiment is the same as that of FIG. 2( a ). As shown in FIG. 4( a ) and FIG. 4( b ), sub-wavelength signal light passes through the first optical switch array 40 , while sub-wavelength false light does not pass through the first optical switch array 40 . In this embodiment, the first optical switch array 40 does not need to adjust the deflection direction of the sub-wavelength dummy light, and each sub-wavelength dummy light will be incident on the second optical switch array 50 . Therefore, the first optical switch array 40 with a smaller size can be used, which reduces the cost. However, this embodiment cannot be applied in scenarios where sub-wavelength signal light needs to be attenuated. It should be understood that, except for the differences described above, this embodiment is similar to the embodiment shown in FIG. 2(a) and FIG. 2(b), and other identical features can be referred to in FIG. The relevant description of the illustrated embodiment is not repeated here.
通过上述各实施例的介绍可知,相同波长的子波长信号光和子波长假光在第二光开关阵列上的入射位置相同,第二光开关阵列的作用是调节每个入射位置处入射光的偏转方向,从而对每个波长的子波长信号光和子波长假光进行二选一,被选中的子波长信号光或子波长假光可以向输出端口传输。通过这种方式,即使某个波长的信号光在传输过程中掉波,也可以通过第二光开关阵列选择该波长的假光来实现上载假光,以填充掉波的信号光的信道,从而保持满波状态,SRS效应稳定,提高了信号传输的稳定性。另外,采用第二光开关阵列只需要在两个输出方向上进行切换即可,调节速度更快,可以实现快速上载信号光和假光。Through the introduction of the above-mentioned embodiments, it can be seen that the incident positions of the sub-wavelength signal light and the sub-wavelength false light of the same wavelength on the second optical switch array are the same, and the function of the second optical switch array is to adjust the deflection of the incident light at each incident position. direction, so as to select one of the sub-wavelength signal light and sub-wavelength false light of each wavelength, and the selected sub-wavelength signal light or sub-wavelength false light can be transmitted to the output port. In this way, even if the signal light of a certain wavelength drops during transmission, the false light of this wavelength can be selected by the second optical switch array to upload the false light to fill the channel of the wave-dropped signal light, thereby Keep the full wave state, the SRS effect is stable, and the stability of signal transmission is improved. In addition, the second optical switch array only needs to switch in two output directions, the adjustment speed is faster, and the fast uploading of signal light and false light can be realized.
上述实施例介绍了本申请提供的其中一种WSS结构,主要是通过调节入射光偏转方向的方式来选择上载信号光或假光。下面还将介绍本申请提供的另一种WSS结构,主要是通过调节光偏振态的方式来选择上载信号光或假光。The above-mentioned embodiment introduces one of the WSS structures provided by the present application, mainly by adjusting the deflection direction of the incident light to select and upload signal light or false light. Another WSS structure provided by the present application will be introduced below, which mainly selects to upload signal light or false light by adjusting the polarization state of light.
图5(a)为本申请实施例中WSS在色散方向的第三种光路示意图。图5(b)为本申请实施例中WSS在端口方向的第三种光路示意图。如图5(a)和图5(b)所示,该波长选择开关包括:信号光输入端口10、假光输入端口20、第一色散元件30、光开关阵列40、第二色散元件60、输出端口70、第一偏振转换装置80、第二偏振转换装置90、偏振合束器100、偏振转换阵列110、偏振分离器120、镜组1、镜组2和镜组3。其中,信号光输入端口10和假光输入端口20分布在X方向上。可选地,该波长选择开关还可以包括镜组4和镜组5。Fig. 5(a) is a schematic diagram of the third optical path of the WSS in the dispersion direction in the embodiment of the present application. Fig. 5(b) is a schematic diagram of the third optical path of the WSS in the port direction in the embodiment of the present application. As shown in Figure 5 (a) and Figure 5 (b), the wavelength selective switch includes: a signal light input port 10, a false light input port 20, a first dispersive element 30, an optical switch array 40, a second dispersive element 60, Output port 70 , first polarization conversion device 80 , second polarization conversion device 90 , polarization beam combiner 100 , polarization conversion array 110 , polarization splitter 120 , mirror group 1 , mirror group 2 and mirror group 3 . Wherein, the signal light input port 10 and the dummy light input port 20 are distributed in the X direction. Optionally, the wavelength selective switch may also include mirror group 4 and mirror group 5 .
具体地,来自信号光输入端口10的信号光在第一偏振态和第二偏振态上都具有分量,同理,和来自假光输入端口20的假光在第一偏振态和第二偏振态上也都具有分量。其中,第一偏振态与第二偏振态相互正交。第一偏振转换装置80用于将来自信号光输入端口10的信号光转换为第一偏振态。第二偏振转换装置90用于将来自假光输入端口20的假光转换为第二偏振态。镜组4用于对来自信号光输入端口10的信号光先进行准直和光束整形后再导向第一色散元件30,并对来自假光输入端口20的假光先进行准直和光束整形后再导向第一色散元件30。第一色散元件30用于在Y方向上将入射的信号光分解为多个子波长信号光,并在Y方向上将入射的假光分解为多个子波长假光。其中,多个子波长信号光的波长各不相同,多个子波长假光的波长各不相同。镜组1用于在Y方向上对多个子波长信号光和多个子波长假光进行准直,以将波长方向的角度差异转换为波长方向的位置差异,多个子波长信号光会分别入射到光开关阵列40的不同位置,多个子波长假光会分别入射到光开关阵列40的不同位置。光开关阵列40用于调节入射的多个子波长信号光和多个子波长假光的偏转方向。镜组2用于将来自光开关阵列40的多个子波长信号光和多个子波长假光导向偏振合束器100。偏振合束器100用于对输入的子波长信号光和子波长假光进行合路,并将合路后的子波长信号光和子波长假光导向偏振转换阵列110。其中,相同波长的子波长信号光和子波长假光在偏振转换阵列110上的入射位置相同。偏振转换阵列110用于调节每个入射位置处入射光的偏振态,以选择从偏振转换阵列110输出的每个子波长信号光的偏振态和每个子波长假光的偏振态。其中,从偏振转换阵列110输出的相同波长的子波长信号光和子波长假光的偏振态不同。偏振分离器120用于透射输入的具有第一偏振态的子波长信号光和/或子波长假光,并反射输入的具有第二偏振态的子波长信号光和/或子波长假光。镜组3用于在Y方向上对偏振分离器120透射的子波长信号光和/或子波长假光进行汇聚。第二色散元件60用于对来自镜组3的子波长信号光和/或子波长假光进行合波。镜组5用于对合波后的光进行光束整形和准直后再导向输出端口70。Specifically, the signal light from the signal light input port 10 has components on the first polarization state and the second polarization state, and likewise, the false light from the false light input port 20 has components on the first polarization state and the second polarization state Both also have weight. Wherein, the first polarization state and the second polarization state are orthogonal to each other. The first polarization conversion device 80 is used to convert the signal light from the signal light input port 10 into a first polarization state. The second polarization conversion device 90 is used for converting the dummy light from the dummy light input port 20 into a second polarization state. The mirror group 4 is used to collimate and beam-shape the signal light from the signal light input port 10 before guiding it to the first dispersion element 30, and to collimate and beam-shape the false light from the false light input port 20 first. It is redirected to the first dispersive element 30 . The first dispersion element 30 is used to decompose the incident signal light into multiple sub-wavelength signal lights in the Y direction, and decompose the incident false light into multiple sub-wavelength false lights in the Y direction. Wherein, the wavelengths of the plurality of sub-wavelength signal lights are different, and the wavelengths of the plurality of sub-wavelength dummy lights are different. The mirror group 1 is used to collimate multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction, so as to convert the angle difference in the wavelength direction into the position difference in the wavelength direction, and the multiple sub-wavelength signal lights will be respectively incident on the light At different positions of the switch array 40 , multiple sub-wavelength false lights are respectively incident on different positions of the optical switch array 40 . The optical switch array 40 is used to adjust the deflection directions of the incident multiple sub-wavelength signal lights and multiple sub-wavelength false lights. The mirror group 2 is used to guide multiple sub-wavelength signal lights and multiple sub-wavelength false lights from the optical switch array 40 to the polarization beam combiner 100 . The polarization beam combiner 100 is used to combine the input sub-wavelength signal light and sub-wavelength dummy light, and guide the combined sub-wavelength signal light and sub-wavelength dummy light to the polarization conversion array 110 . Wherein, the incident positions of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength on the polarization conversion array 110 are the same. The polarization conversion array 110 is used to adjust the polarization state of the incident light at each incident position, so as to select the polarization state of each sub-wavelength signal light and the polarization state of each sub-wavelength dummy light output from the polarization conversion array 110 . Wherein, the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength output from the polarization conversion array 110 have different polarization states. The polarization splitter 120 is configured to transmit the input sub-wavelength signal light and/or sub-wavelength dummy light with the first polarization state, and reflect the input sub-wavelength signal light and/or sub-wavelength dummy light with the second polarization state. The mirror group 3 is used for converging the sub-wavelength signal light and/or the sub-wavelength dummy light transmitted by the polarization splitter 120 in the Y direction. The second dispersion element 60 is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the mirror group 3 . The mirror group 5 is used to shape and collimate the beams of the multiplexed light and guide it to the output port 70 .
在本实施例中,光开关阵列40上子波长信号光和子波长假光的光斑分布可以如上述图3(a)所示,偏振转换阵列110上子波长信号光和子波长假光的光斑分布可以如上述图3(b)所示。相同波长的子波长信号光的光斑和子波长假光的光斑完全重合或部分重叠都可以视为在偏振转换阵列110上的入射位置相同。In this embodiment, the spot distribution of the sub-wavelength signal light and the sub-wavelength false light on the optical switch array 40 can be as shown in FIG. As shown in Figure 3(b) above. The light spots of the sub-wavelength signal light of the same wavelength and the light spots of the sub-wavelength dummy light completely overlap or partially overlap, which can be regarded as having the same incident position on the polarization conversion array 110 .
需要说明的是,上述的光开关阵列40和偏振转换阵列110都由控制器(图中未示出)进行控制。控制器通过控制光开关阵列40实现波长选择功能,即光开关阵列40可以通过调节入射光的偏转方向让指定波长的子波长信号光和/或子波长假光导向偏振转换阵列110。控制器通过控制偏振转换阵列110对相同波长的子波长信号光和子波长假光进行偏振态转换,并结合偏振分离器120对相同波长的子波长信号光和子波长假光进行二选一。应理解,偏振转换阵列110只需要对入射光进行偏振态转换,调节速度更快,可以实现快速上载信号光和假光。作为一个示例,对于相同波长的子波长信号光和子波长假光来说,若偏振转换阵列110不改变入射光的偏振态,则子波长信号光将通过偏振分离器120向输出端口70传输;若偏振转换阵列110改变入射光的偏振态,则子波长假光通过偏振分离器120向输出端口70传输。It should be noted that both the optical switch array 40 and the polarization conversion array 110 mentioned above are controlled by a controller (not shown in the figure). The controller realizes the wavelength selection function by controlling the optical switch array 40 , that is, the optical switch array 40 can guide the sub-wavelength signal light and/or sub-wavelength false light of a specified wavelength to the polarization conversion array 110 by adjusting the deflection direction of the incident light. The controller converts the polarization state of the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength by controlling the polarization conversion array 110 , and selects one of the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength in combination with the polarization separator 120 . It should be understood that the polarization conversion array 110 only needs to convert the polarization state of the incident light, the adjustment speed is faster, and the signal light and false light can be uploaded quickly. As an example, for sub-wavelength signal light and sub-wavelength false light of the same wavelength, if the polarization conversion array 110 does not change the polarization state of the incident light, the sub-wavelength signal light will be transmitted to the output port 70 through the polarization splitter 120; if The polarization conversion array 110 changes the polarization state of the incident light, and then the sub-wavelength false light is transmitted to the output port 70 through the polarization separator 120 .
在一些可能的实施方式中,若相同波长的子波长信号光和子波长假光都入射到偏振转换阵列110,从偏振转换阵列110输出的子波长信号光将保持第一偏振态,即子波长信号光可 以通过偏振分离器120向输出端口70传输。若子波长信号光没有入射到偏振转换阵列110或者子波长信号光的能量衰减较大,偏振转换阵列110会将相同波长的子波长假光转换为第一偏振态,即子波长假光可以通过偏振分离器120向输出端口70传输。作为一个示例,可以通过OPM装置对偏振转换阵列110上入射的子波长信号光的能量进行检测。假设偏振转换阵列110上第一入射位置处入射的第一子波长信号光的能量衰减大于或等于预设值,则偏振转换阵列110输出的第一子波长假光具有第一偏振态。反之,第二光开关阵列50输出的第一子波长信号光保持第一偏振态。其中,该预设值具体以实际应用为准,例如5dB,此处不做限定。应理解,通过检测偏振转换阵列110上入射的子波长信号光的能量可以合理地对相同波长的子波长信号光和子波长假光进行选择,使得正常传输的子波长信号光仍能继续传输,对于非正常传输的子波长信号光可以通过上载子波长假光以保证经过WSS后的光处于满波状态。In some possible implementations, if both sub-wavelength signal light and sub-wavelength false light of the same wavelength are incident on the polarization conversion array 110, the sub-wavelength signal light output from the polarization conversion array 110 will maintain the first polarization state, that is, the sub-wavelength signal Light may be transmitted to output port 70 through polarization splitter 120 . If the sub-wavelength signal light is not incident on the polarization conversion array 110 or the energy attenuation of the sub-wavelength signal light is large, the polarization conversion array 110 will convert the sub-wavelength false light of the same wavelength into the first polarization state, that is, the sub-wavelength false light can pass through the polarization Splitter 120 transmits to output port 70 . As an example, the energy of the sub-wavelength signal light incident on the polarization conversion array 110 may be detected by an OPM device. Assuming that the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the polarization conversion array 110 is greater than or equal to a preset value, the first sub-wavelength false light output by the polarization conversion array 110 has a first polarization state. On the contrary, the first sub-wavelength signal light output by the second optical switch array 50 maintains the first polarization state. Wherein, the preset value is subject to actual application, for example, 5dB, which is not limited here. It should be understood that by detecting the energy of the sub-wavelength signal light incident on the polarization conversion array 110, the sub-wavelength signal light and the sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still continue to transmit, for The abnormally transmitted sub-wavelength signal light can be uploaded with sub-wavelength false light to ensure that the light after passing through the WSS is in a full-wave state.
需要说明的是,本申请不限定光开关阵列40和偏振转换阵列110的具体类型。作为一个示例,光开关阵列40采用LCOS,偏振转换阵列110采用硅基铁电液晶(Ferroelectric Liquid Crystal on Silicon,F-LCOS)。本申请也不限定第一色散元件30和第二色散元件60的具体类型。作为一个示例,第一色散元件30和第二色散元件60可以采用光栅、DOE或超表面元件等。It should be noted that, the present application does not limit the specific types of the optical switch array 40 and the polarization conversion array 110 . As an example, the optical switch array 40 adopts LCOS, and the polarization conversion array 110 adopts Ferroelectric Liquid Crystal on Silicon (F-LCOS). The present application also does not limit the specific types of the first dispersion element 30 and the second dispersion element 60 . As an example, the first dispersive element 30 and the second dispersive element 60 may be gratings, DOEs or metasurface elements.
在一些可能的实施方式中,还可以利用上述图5(a)和图5(b)所示的WSS对子波长信号光或子波长假光进行衰减。应理解,具体通过偏振转换阵列110调节子波长信号光或子波长假光的偏振态进行衰减。并且,对子波长信号光进行衰减之前,还需要让相同波长的子波长假光不入射到偏振转换阵列110。因为,如果相同波长的子波长信号光和子波长假光都入射到偏振转换阵列110,对子波长信号光进行衰减的同时会增强子波长假光,影响对子波长信号光的衰减效果。也就是说,通过偏振转换阵列110减少了一部分向输出端口70传输的子波长信号光,就会相应增加一部分向输出端口70传输的子波长假光,二者是此消彼长的关系。同理,对子波长假光进行衰减之前,还需要让相同波长的子波长信号光不入射到偏振转换阵列110。下面具体实施方式分别进行介绍。In some possible implementation manners, the WSS shown in FIG. 5( a ) and FIG. 5( b ) may also be used to attenuate sub-wavelength signal light or sub-wavelength false light. It should be understood that the polarization state of sub-wavelength signal light or sub-wavelength false light is specifically adjusted through the polarization conversion array 110 to perform attenuation. In addition, before attenuating the sub-wavelength signal light, it is also necessary to prevent the sub-wavelength spurious light of the same wavelength from entering the polarization conversion array 110 . Because, if both the sub-wavelength signal light and the sub-wavelength false light of the same wavelength are incident on the polarization conversion array 110, the sub-wavelength signal light will be attenuated while the sub-wavelength false light will be enhanced, which will affect the attenuation effect on the sub-wavelength signal light. That is to say, if a part of the sub-wavelength signal light transmitted to the output port 70 is reduced through the polarization conversion array 110, a part of the sub-wavelength spurious light transmitted to the output port 70 will be correspondingly increased, and the two are in a trade-off relationship. Similarly, before attenuating sub-wavelength false light, it is also necessary to prevent sub-wavelength signal light of the same wavelength from entering the polarization conversion array 110 . The following specific implementation methods will be introduced respectively.
实施方式1:衰减子波长信号光。Embodiment 1: Attenuation of sub-wavelength signal light.
光开关阵列40调节入射的第二子波长假光的偏转方向,以使得第二子波长假光不导向偏振合束器100。偏振转换阵列110调节入射的第二子波长信号光的偏振态,以衰减第二子波长信号光向输出端口70传输的能量。其中,第二子波长信号光与第二子波长假光的波长相同。The optical switch array 40 adjusts the deflection direction of the incident second sub-wavelength dummy light so that the second sub-wavelength dummy light does not lead to the polarization beam combiner 100 . The polarization conversion array 110 adjusts the polarization state of the incident second sub-wavelength signal light to attenuate the energy transmitted to the output port 70 by the second sub-wavelength signal light. Wherein, the wavelength of the second sub-wavelength signal light is the same as that of the second sub-wavelength dummy light.
实施方式2:衰减子波长假光。Embodiment 2: Attenuating sub-wavelength false light.
光开关阵列40调节入射的第三子波长信号光的偏转方向,以使得第三子波长信号光不导向偏振合束器100。偏振转换阵列110调节第三子波长假光的偏转方向,以衰减第三子波长假光向输出端口70传输的能量。其中,第三子波长信号光与第三子波长假光的波长相同。The optical switch array 40 adjusts the deflection direction of the incident third sub-wavelength signal light so that the third sub-wavelength signal light does not guide to the polarization beam combiner 100 . The polarization conversion array 110 adjusts the deflection direction of the third sub-wavelength dummy light to attenuate the energy transmitted to the output port 70 by the third sub-wavelength dummy light. Wherein, the third sub-wavelength signal light and the third sub-wavelength dummy light have the same wavelength.
需要说明的是,本申请不限定上述的镜组1、镜组2、镜组3、镜组4和镜组5的组成方式,下面提供一种具体的实现方式。It should be noted that the present application does not limit the composition of the mirror group 1 , the mirror group 2 , the mirror group 3 , the mirror group 4 and the mirror group 5 , and a specific implementation is provided below.
如图5(a)和图5(b)所示,镜组1包括透镜1、透镜2和透镜3,镜组2包括透镜4、透镜5、透镜6、透镜13和反射镜,镜组3包括透镜7和透镜8,镜组4包括透镜9和透镜 10,镜组5包括透镜11和透镜12。具体地,透镜9用于对入射的信号光和假光进行准直,透镜10用于对入射的信号光和假光进行光束整形。透镜1用于在X方向上对来自多个信号光输入端口10的多路子波长信号光进行汇聚,以图5(b)所示的3个信号光输入端口10为例,沿透镜1光轴传输的一路子波长信号光经透镜1透射至光开关阵列40,另外两路子波长信号光经透镜1折射至光开关阵列40,三路子波长信号光被汇聚到光开关阵列40在X方向上的相同位置。透镜2与透镜1的作用类似,用于在X方向上对入射的子波长假光进行透射或折射,使得入射到光开关阵列40的子波长假光与子波长信号光在X方向上的入射位置不同。透镜3用于在Y方向上对入射的多个子波长信号光和多个子波长假光进行准直。透镜4用于在Y方向上对入射的子波长信号光进行汇聚并对入射的子波长假光进行汇聚,透镜5用于对入射的子波长信号光进行光束整形,透镜6用于在Y方向上对入射的子波长信号光进行准直。透镜13用于对入射的子波长假光进行光束整形,反射镜用于将来自透镜13的子波长假光反射至偏振合束器100。透镜7用于在Y方向上对入射的子波长信号光进行汇聚并对入射的子波长假光进行汇聚,透镜8用于对入射的子波长信号光和子波长假光进行光束整形。透镜11用于对经第二色散元件60合波后的光进行光束整形,透镜12用于对合波后的光进行准直。As shown in Fig. 5 (a) and Fig. 5 (b), mirror group 1 comprises lens 1, lens 2 and lens 3, mirror group 2 comprises lens 4, lens 5, lens 6, lens 13 and reflecting mirror, mirror group 3 Including lens 7 and lens 8 , lens group 4 includes lens 9 and lens 10 , and lens group 5 includes lens 11 and lens 12 . Specifically, the lens 9 is used for collimating the incident signal light and false light, and the lens 10 is used for beam shaping the incident signal light and false light. The lens 1 is used to converge the multi-channel sub-wavelength signal lights from multiple signal light input ports 10 in the X direction. Taking the three signal light input ports 10 shown in FIG. 5(b) as an example, along the optical axis of the lens 1 The transmitted one-way sub-wavelength signal light is transmitted to the optical switch array 40 through the lens 1, and the other two-way sub-wavelength signal light is refracted to the optical switch array 40 through the lens 1, and the three-way sub-wavelength signal light is converged to the optical switch array 40 in the X direction. same location. The function of lens 2 is similar to that of lens 1, and is used to transmit or refract the incident sub-wavelength false light in the X direction, so that the sub-wavelength false light incident on the optical switch array 40 and the incident sub-wavelength signal light in the X direction The location is different. The lens 3 is used to collimate the incident multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction. Lens 4 is used to converge the incident sub-wavelength signal light in the Y direction and converge the incident sub-wavelength false light. Lens 5 is used to shape the incident sub-wavelength signal light. The incident sub-wavelength signal light is collimated. The lens 13 is used to shape the incident sub-wavelength false light, and the mirror is used to reflect the sub-wavelength false light from the lens 13 to the polarization beam combiner 100 . The lens 7 is used to converge the incident sub-wavelength signal light and the incident sub-wavelength dummy light in the Y direction, and the lens 8 is used to perform beam shaping on the incident sub-wavelength signal light and sub-wavelength dummy light. The lens 11 is used to shape the beam of the light combined by the second dispersion element 60 , and the lens 12 is used to collimate the combined light.
在一种可能的实施方式中,如图5(a)所示,透镜10的前焦面与透镜9的后焦面重合。第一色散元件30位于透镜10的后焦面,且位于透镜3的前焦面。光开关阵列40位于透镜3的后焦面,且位于透镜4的前焦面。透镜4的后焦面与透镜6的前焦面重合。偏振转换阵列110位于透镜6的后焦面,且位于透镜7的前焦面。第二色散元件60位于透镜7的后焦面,且位于透镜11的前焦面。透镜11位于透镜12的前焦面。如图5(b)所示,透镜1与第一色散元件30位置接近,透镜8与第二色散元件60位置接近。透镜1的前焦面与透镜9的后焦面重合。光开关阵列40位于透镜1的后焦面。透镜2的前焦面与透镜9的后焦面重合。光开关阵列40位于透镜2的后焦面。光开关阵列40位于透镜5的前焦面,第二光开关阵列50位于透镜5的后焦面。光开关阵列40位于透镜13的前焦面,第二光开关阵列50位于透镜13的后焦面。偏振转换阵列110位于透镜8的前焦面。透镜8的后焦面与透镜12的前焦面重合。In a possible implementation manner, as shown in FIG. 5( a ), the front focal plane of the lens 10 coincides with the back focal plane of the lens 9 . The first dispersion element 30 is located at the rear focal plane of the lens 10 and at the front focal plane of the lens 3 . The optical switch array 40 is located at the rear focal plane of the lens 3 and at the front focal plane of the lens 4 . The rear focal plane of lens 4 coincides with the front focal plane of lens 6 . The polarization conversion array 110 is located at the back focal plane of the lens 6 and at the front focal plane of the lens 7 . The second dispersion element 60 is located at the rear focal plane of the lens 7 and at the front focal plane of the lens 11 . The lens 11 is located at the front focal plane of the lens 12 . As shown in FIG. 5( b ), the lens 1 is close to the first dispersion element 30 , and the lens 8 is close to the second dispersion element 60 . The front focal plane of lens 1 coincides with the back focal plane of lens 9 . The optical switch array 40 is located at the rear focal plane of the lens 1 . The front focal plane of lens 2 coincides with the back focal plane of lens 9 . The optical switch array 40 is located on the back focal plane of the lens 2 . The optical switch array 40 is located on the front focal plane of the lens 5 , and the second optical switch array 50 is located on the rear focal plane of the lens 5 . The optical switch array 40 is located on the front focal plane of the lens 13 , and the second optical switch array 50 is located on the rear focal plane of the lens 13 . The polarization conversion array 110 is located at the front focal plane of the lens 8 . The back focal plane of lens 8 coincides with the front focal plane of lens 12 .
需要说明的是,在上述图5(a)和图5(b)所示WSS的基础上还可以进行变形,使得来自镜组1的多个子波长假光直接传输到镜组2而不经过光开关阵列40。下面结合附图进行介绍。It should be noted that, on the basis of the above WSS shown in Figure 5(a) and Figure 5(b), deformations can also be made, so that multiple sub-wavelength false lights from mirror group 1 are directly transmitted to mirror group 2 without passing through the light switch array 40 . Introduce below in conjunction with accompanying drawing.
图6(a)为本申请实施例中WSS在色散方向的第四种光路示意图。图6(b)为本申请实施例中WSS在端口方向的第四种光路示意图。应理解,图6(a)展示的本实施例中假光在色散方向的光路示意图。本实施例中信号光在色散方向的光束示意图与上述图5(a)相同。如图6(a)和图6(b)所示,子波长信号光会经过光开关阵列40,而子波长假光不会经过光开关阵列40。在该实施例中,光开关阵列40无需调节子波长假光的偏转方向,每个子波长假光都会入射到偏振合束器100。因此,可以采用尺寸较小的光开关阵列40,降低了成本。但是,该实施例无法应用在需要对子波长信号光进行衰减的场景中。应理解,除了上述介绍的区别之外,该实施例与上述图5(a)和图5(b)所示实施例类似,其他相同特征可以参考图5(a)和图5(b)所示实施例的相关描述,此处不再重复介绍。Fig. 6(a) is a schematic diagram of the fourth optical path of the WSS in the dispersion direction in the embodiment of the present application. FIG. 6( b ) is a schematic diagram of a fourth optical path of the WSS in the port direction in the embodiment of the present application. It should be understood that FIG. 6( a ) shows a schematic diagram of the optical path of the false light in the dispersion direction in this embodiment. The beam schematic diagram of the signal light in the dispersion direction in this embodiment is the same as the above-mentioned FIG. 5( a ). As shown in FIG. 6( a ) and FIG. 6( b ), sub-wavelength signal light passes through the optical switch array 40 , while sub-wavelength false light does not pass through the optical switch array 40 . In this embodiment, the optical switch array 40 does not need to adjust the deflection direction of the sub-wavelength dummy light, and each sub-wavelength dummy light will be incident on the polarization beam combiner 100 . Therefore, an optical switch array 40 with a smaller size can be used, reducing the cost. However, this embodiment cannot be applied in scenarios where sub-wavelength signal light needs to be attenuated. It should be understood that, except for the differences described above, this embodiment is similar to the embodiment shown in FIG. 5(a) and FIG. 5(b), and other identical features can be referred to in FIG. The relevant description of the illustrated embodiment is not repeated here.
通过上述各实施例的介绍可知,相同波长的子波长信号光和子波长假光在偏振转换阵列上的入射位置相同,偏振转换阵列的作用是调节每个入射位置处入射光的偏振态,并结合偏振分离器对每个波长的子波长信号光和子波长假光进行二选一,被选中的子波长信号光或子波长假光可以向输出端口传输。通过这种方式,即使某个波长的信号光在传输过程中掉波,也可以通过偏振转换阵列和偏转分离器选择该波长的假光来实现上载假光,以填充掉波的信号光的信道,从而保持满波状态,SRS效应稳定,提高了信号传输的稳定性。另外,采用偏振转换阵列只需要对入射光在两个偏振态之间进行转换,调节速度更快,可以实现快速上载信号光和假光。Through the introduction of the above-mentioned embodiments, it can be seen that the incident position of the sub-wavelength signal light and sub-wavelength false light on the polarization conversion array is the same, and the function of the polarization conversion array is to adjust the polarization state of the incident light at each incident position, and combine The polarization separator selects one of the sub-wavelength signal light and the sub-wavelength dummy light of each wavelength, and the selected sub-wavelength signal light or sub-wavelength dummy light can be transmitted to the output port. In this way, even if the signal light of a certain wavelength is dropped during transmission, the false light of this wavelength can be selected through the polarization conversion array and the deflection splitter to upload the false light to fill the channel of the dropped signal light , so as to maintain the full wave state, the SRS effect is stable, and the stability of signal transmission is improved. In addition, the use of the polarization conversion array only needs to convert the incident light between two polarization states, the adjustment speed is faster, and the signal light and false light can be uploaded quickly.
需要说明的是,上述提供的各实施例都是以透射式的光开关阵列40来介绍的。在一些可能的实施方式中,也可以采用反射式的光开关阵列40。也就是说,WSS中的输出端口70与信号光输入端口10和假光输入端口20位于同侧,采用的是折叠式光路。应理解,采用反射式的光开关阵列40的实施方式在上述实施例的基础上进行简单的变换即可得到,此此处不再提供附图展示和文字介绍。It should be noted that, the above-mentioned embodiments are all introduced by using the transmissive optical switch array 40 . In some possible implementation manners, a reflective optical switch array 40 may also be used. That is to say, the output port 70 in the WSS is located on the same side as the signal light input port 10 and the dummy light input port 20 , and a folded light path is adopted. It should be understood that the embodiment using the reflective optical switch array 40 can be obtained by simple transformation on the basis of the above-mentioned embodiments, and no drawings and text descriptions are provided here.
需要说明的是,以上实施例仅用以说明本申请的技术方案,而非对其限制。尽管参照前述实施例对本申请进行了详细说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。It should be noted that the above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications Or replacement, does not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (22)
- 一种波长选择开关WSS,其特征在于,包括:信号光输入端口、假光输入端口、输出端口、第一色散元件、第二色散元件、第一光开关阵列、第二光开关阵列、第一镜组、第二镜组和第三镜组,其中,所述信号光输入端口和所述假光输入端口沿第一方向分布;A wavelength selective switch WSS, characterized in that it includes: a signal light input port, a dummy light input port, an output port, a first dispersive element, a second dispersive element, a first optical switch array, a second optical switch array, a first The mirror group, the second mirror group and the third mirror group, wherein the signal light input ports and the dummy light input ports are distributed along the first direction;所述第一色散元件用于在第二方向上将来自所述信号光输入端口的信号光分解为多个子波长信号光,并在所述第二方向上将来自所述假光输入端口的假光分解为多个子波长假光,所述第二方向与所述第一方向垂直;The first dispersion element is used to decompose the signal light from the signal light input port into a plurality of sub-wavelength signal lights in the second direction, and divide the false light from the false light input port in the second direction light is decomposed into a plurality of sub-wavelength false lights, and the second direction is perpendicular to the first direction;所述第一镜组用于在所述第二方向上对所述多个子波长信号光和所述多个子波长假光进行准直;The first lens group is used to collimate the plurality of sub-wavelength signal lights and the plurality of sub-wavelength false lights in the second direction;所述第一光开关阵列用于调节来自第一透镜的多个子波长信号光的偏转方向;The first optical switch array is used to adjust the deflection directions of multiple sub-wavelength signal lights from the first lens;所述第二镜组用于将来自所述第一光开关阵列的子波长信号光和来自所述第一镜组的子波长假光导向所述第二光开关阵列,其中,相同波长的子波长信号光和子波长假光在所述第二光开关阵列上的入射位置相同;The second mirror group is used to guide the sub-wavelength signal light from the first optical switch array and the sub-wavelength false light from the first mirror group to the second optical switch array, wherein the sub-wavelength signals of the same wavelength The incident positions of the wavelength signal light and the sub-wavelength false light on the second optical switch array are the same;所述第二光开关阵列用于调节每个入射位置处入射光的偏转方向,以使得每个波长的子波长信号光或子波长假光向所述输出端口传输;The second optical switch array is used to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength signal light or sub-wavelength false light of each wavelength is transmitted to the output port;所述第三镜组用于在所述第二方向上对来自所述第二光开关阵列的子波长信号光和/或子波长假光进行汇聚;The third mirror group is used to converge the sub-wavelength signal light and/or sub-wavelength false light from the second optical switch array in the second direction;所述第二色散元件用于对来自所述第三镜组的子波长信号光和/或子波长假光进行合波,并将合波后的光导向所述输出端口。The second dispersive element is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the third mirror group, and guiding the multiplexed light to the output port.
- 根据权利要求1所述的WSS,其特征在于,若所述第二光开关阵列上第一入射位置处入射的第一子波长信号光的能量衰减大于或等于预设值,则所述第一入射位置处入射的第一子波长假光通过所述第二光开关阵列向所述输出端口传输;The WSS according to claim 1, wherein if the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is greater than or equal to a preset value, the first The first sub-wavelength false light incident at the incident position is transmitted to the output port through the second optical switch array;若所述第二光开关阵列上第一入射位置处入射的第一子波长信号光的能量衰减小于所述预设值,则所述第一子波长信号光通过所述第二光开关阵列向所述输出端口传输。If the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is less than the preset value, the first sub-wavelength signal light passes through the second optical switch array to The output port transmits.
- 根据权利要求1或2所述的WSS,其特征在于,来自所述第一镜组的多个子波长假光经过所述第一光开关阵列传输至所述第二镜组。The WSS according to claim 1 or 2, characterized in that the multiple sub-wavelength false lights from the first optical group are transmitted to the second optical group through the first optical switch array.
- 根据权利要求3所述的WSS,其特征在于,所述第一光开关阵列还用于调节来自所述第一镜组的第二子波长假光的偏转方向,其中,偏转方向调节后的所述第二子波长假光不导向所述第二光开关阵列;The WSS according to claim 3, wherein the first optical switch array is also used to adjust the deflection direction of the second sub-wavelength false light from the first mirror group, wherein the adjusted deflection direction of the The second sub-wavelength false light is not directed to the second optical switch array;所述第二光开关阵列用于调节来自所述第二镜组的第二子波长信号光的偏转方向,以衰减所述第二子波长信号光向所述输出端口传输的能量,所述第二子波长假光与所述第二子波长信号光的波长相同。The second optical switch array is used to adjust the deflection direction of the second sub-wavelength signal light from the second mirror group, so as to attenuate the energy transmitted by the second sub-wavelength signal light to the output port. The second sub-wavelength dummy light has the same wavelength as the second sub-wavelength signal light.
- 根据权利要求1至4中任一项所述的WSS,其特征在于,第三子波长信号光经过所述第一光开关阵列调节偏转方向后不导向所述第二光开关阵列;The WSS according to any one of claims 1 to 4, wherein the third sub-wavelength signal light is not guided to the second optical switch array after the deflection direction is adjusted by the first optical switch array;所述第二光开关阵列用于调节来自所述第二镜组的第三子波长假光的偏转方向,以衰减所述第三子波长假光向所述输出端口传输的能量,所述第三子波长假光与所述第三子波长信号光的波长相同。The second optical switch array is used to adjust the deflection direction of the third sub-wavelength false light from the second mirror group, so as to attenuate the energy transmitted by the third sub-wavelength false light to the output port, and the first The third sub-wavelength dummy light has the same wavelength as the third sub-wavelength signal light.
- 根据权利要求1至5中任一项所述的WSS,其特征在于,所述WSS还包括第四镜组和第五镜组;The WSS according to any one of claims 1 to 5, wherein the WSS further comprises a fourth mirror group and a fifth mirror group;所述第四镜组用于对来自所述信号光输入端口的信号光先进行准直和光束整形再导向所述第一色散元件,并对来自所述假光输入端口的假光先进行准直和光束整形再导向所述第一色散元件;The fourth mirror group is used to collimate and shape the signal light from the signal light input port before guiding it to the first dispersion element, and to collimate the false light from the false light input port first. directing and shaping the beam to redirect the first dispersive element;所述第五镜组用于对来自所述第二色散元件的合波后的光先进行准直和光束整形再导向所述输出端口。The fifth mirror group is used to collimate and shape the combined light from the second dispersive element before guiding it to the output port.
- 根据权利要求1至6中任一项所述的WSS,其特征在于,所述第一镜组包括第一透镜、第二透镜和第三透镜;The WSS according to any one of claims 1 to 6, wherein the first lens group comprises a first lens, a second lens and a third lens;所述第一透镜用于透射来自所述第一色散元件的所述多个子波长信号光,或者,在所述第一方向上对来自所述第一色散元件的所述多个子波长信号光进行折射;The first lens is used to transmit the multiple sub-wavelength signal lights from the first dispersive element, or to transmit the multiple sub-wavelength signal lights from the first dispersive element in the first direction refraction;所述第二透镜用于透射来自所述第一色散元件的所述多个子波长假光,或者,在所述第一方向上对来自所述第一色散元件的所述多个子波长假光进行折射;The second lens is used to transmit the multiple sub-wavelength pseudo-lights from the first dispersive element, or to transmit the multiple sub-wavelength pseudo-lights from the first dispersive element in the first direction refraction;所述第三透镜用于在所述第二方向上对来自所述第一透镜的所述多个子波长信号光进行准直,并对来自所述第二透镜的所述多个子波长假光进行准直。The third lens is used to collimate the multiple sub-wavelength signal lights from the first lens in the second direction, and collimate the multiple sub-wavelength false lights from the second lens. collimation.
- 根据权利要求1至7中任一项所述的WSS,其特征在于,所述第二镜组包括第四透镜、第五透镜和第六透镜;The WSS according to any one of claims 1 to 7, wherein the second lens group comprises a fourth lens, a fifth lens and a sixth lens;所述第四透镜用于在所述第二方向上对来自所述第一光开关阵列的子波长信号光进行汇聚,并对来自所述第一镜组的子波长假光进行汇聚;The fourth lens is used for converging the sub-wavelength signal light from the first optical switch array in the second direction, and converging the sub-wavelength false light from the first mirror group;所述第五透镜用于在所述第一方向上对来自所述第四透镜的子波长信号光和子波长假光进行汇聚;The fifth lens is used to converge the sub-wavelength signal light and sub-wavelength false light from the fourth lens in the first direction;所述第六透镜用于在所述第二方向上对来自所述第五透镜的子波长信号光和子波长假光进行准直并导向所述第二光开关阵列。The sixth lens is configured to collimate the sub-wavelength signal light and the sub-wavelength false light from the fifth lens in the second direction and direct them to the second optical switch array.
- 根据权利要求1至8中任一项所述的WSS,其特征在于,所述第三镜组包括第七透镜和第八透镜;The WSS according to any one of claims 1 to 8, wherein the third lens group includes a seventh lens and an eighth lens;所述第七透镜用于在所述第二方向上对来自所述第二光开关阵列的子波长信号光进行汇聚,并对来自所述第二光开关阵列的子波长假光进行汇聚;The seventh lens is used for converging the sub-wavelength signal light from the second optical switch array in the second direction, and converging the sub-wavelength false light from the second optical switch array;所述第八透镜用于对来自所述第七透镜的子波长信号光和子波长假光进行光束整形。The eighth lens is used for beam shaping the sub-wavelength signal light and sub-wavelength dummy light from the seventh lens.
- 根据权利要求1至9中任一项所述的WSS,其特征在于,所述第一光开关阵列为硅基液晶LCOS,所述第二光开关阵列为数字光处理器DLP。The WSS according to any one of claims 1 to 9, wherein the first optical switch array is a liquid crystal on silicon LCOS, and the second optical switch array is a digital light processor (DLP).
- 根据权利要求1至10中任一项所述的WSS,其特征在于,所述WSS还包括控制器, 所述第一光开关阵列和所述第二光开关阵列由所述控制器进行控制。The WSS according to any one of claims 1 to 10, wherein the WSS further comprises a controller, and the first optical switch array and the second optical switch array are controlled by the controller.
- 一种波长选择开关WSS,其特征在于,包括:信号光输入端口、假光输入端口、输出端口、第一色散元件、第二色散元件、光开关阵列、第一偏振转换装置、第二偏振转换装置、偏振合束器、偏振转换阵列、偏振分离器、第一镜组、第二镜组和第三镜组,其中,所述信号光输入端口和所述假光输入端口沿第一方向分布;A wavelength selective switch WSS, characterized in that it includes: a signal light input port, a dummy light input port, an output port, a first dispersive element, a second dispersive element, an optical switch array, a first polarization conversion device, and a second polarization conversion device, polarization beam combiner, polarization conversion array, polarization splitter, first mirror group, second mirror group and third mirror group, wherein the signal light input ports and the dummy light input ports are distributed along the first direction ;所述第一偏振转换装置用于将来自所述信号光输入端口的信号光转换为第一偏振态;The first polarization conversion device is used to convert the signal light from the signal light input port into a first polarization state;所述第二偏振转换装置用于将来自所述假光输入端口的假光转换为第二偏振态,所述第一偏振态与所述第二偏振态相互正交;The second polarization conversion device is used to convert the dummy light from the dummy light input port into a second polarization state, and the first polarization state and the second polarization state are orthogonal to each other;所述第一色散元件用于在第二方向上将来自所述第一偏振转换装置的信号光分解为多个子波长信号光,并在所述第二方向上将来自所述第二偏振转换装置的假光分解为多个子波长假光,所述第二方向与所述第一方向垂直;The first dispersion element is used to decompose the signal light from the first polarization conversion device into a plurality of sub-wavelength signal lights in the second direction, and split the signal light from the second polarization conversion device in the second direction The false light is decomposed into a plurality of sub-wavelength false lights, and the second direction is perpendicular to the first direction;所述第一镜组用于在所述第二方向上对所述多个子波长信号光和所述多个子波长假光进行准直;The first lens group is used to collimate the plurality of sub-wavelength signal lights and the plurality of sub-wavelength false lights in the second direction;所述光开关阵列用于调节来自第一透镜的多个子波长信号光的偏转方向;The optical switch array is used to adjust the deflection directions of multiple sub-wavelength signal lights from the first lens;所述第二镜组用于将来自所述光开关阵列的子波长信号光和来自所述第一镜组的子波长假光导向所述偏振合束器;The second mirror group is used to guide the sub-wavelength signal light from the optical switch array and the sub-wavelength false light from the first mirror group to the polarization beam combiner;所述偏振合束器用于对来自所述第二镜组的子波长信号光和子波长假光进行合路,并将合路后的子波长信号光和子波长假光导向所述偏振转换阵列,其中,相同波长的子波长信号光和子波长假光在所述偏振转换阵列上的入射位置相同;The polarization beam combiner is used to combine the sub-wavelength signal light and sub-wavelength dummy light from the second mirror group, and guide the combined sub-wavelength signal light and sub-wavelength dummy light to the polarization conversion array, wherein , the incident positions of sub-wavelength signal light and sub-wavelength false light of the same wavelength on the polarization conversion array are the same;所述偏振转换阵列用于调节每个入射位置处入射光的偏振态,以选择从所述偏振转换阵列输出的每个子波长信号光的偏振态和每个子波长假光的偏振态,其中,从所述偏振转换阵列输出的相同波长的子波长信号光和子波长假光的偏振态不同;The polarization conversion array is used to adjust the polarization state of the incident light at each incident position to select the polarization state of each sub-wavelength signal light output from the polarization conversion array and the polarization state of each sub-wavelength false light, wherein, from The polarization states of the sub-wavelength signal light and the sub-wavelength false light of the same wavelength output by the polarization conversion array are different;所述偏振分离器用于透射来自所述偏振转换阵列的具有第一偏振态的子波长信号光和/或子波长假光,并反射来自所述偏振转换阵列的具有第二偏振态的子波长信号光和/或子波长假光;The polarization splitter is used to transmit the sub-wavelength signal light and/or sub-wavelength dummy light with the first polarization state from the polarization conversion array, and reflect the sub-wavelength signal with the second polarization state from the polarization conversion array light and/or sub-wavelength spurious light;所述第三镜组用于在所述第二方向上对所述偏振分离器透射的子波长信号光和/或子波长假光进行汇聚;The third mirror group is used to converge the sub-wavelength signal light and/or sub-wavelength false light transmitted by the polarization splitter in the second direction;所述第二色散元件用于对来自所述第三镜组的子波长信号光和/或子波长假光进行合波,并将合波后的光导向所述输出端口。The second dispersive element is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the third mirror group, and guiding the multiplexed light to the output port.
- 根据权利要求12所述的WSS,其特征在于,若所述偏振转换阵列上第一入射位置处入射的第一子波长信号光的能量衰减大于或等于预设值,则所述第一入射位置处入射的第一子波长假光经过所述偏振转换阵列后具有第一偏振态,所述第一子波长信号光经过所述偏振转换阵列后具有第二偏振态;The WSS according to claim 12, wherein if the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the polarization conversion array is greater than or equal to a preset value, the first incident position The first sub-wavelength dummy light incident at the position has a first polarization state after passing through the polarization conversion array, and the first sub-wavelength signal light has a second polarization state after passing through the polarization conversion array;若所述第二光开关阵列上第一入射位置处入射的第一子波长信号光的能量衰减小于所述预设值,则所述第一子波长假光经过所述偏振转换阵列后具有第二偏振态,所述第一子 波长信号光经过所述偏振转换阵列后具有第一偏振态。If the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is less than the preset value, the first sub-wavelength false light has the first sub-wavelength false light after passing through the polarization conversion array. Two polarization states, the first sub-wavelength signal light has a first polarization state after passing through the polarization conversion array.
- 根据权利要求12或13所述的WSS,其特征在于,来自所述第一镜组的多个子波长假光经过所述光开关阵列传输至所述第二镜组。The WSS according to claim 12 or 13, wherein the plurality of sub-wavelength false lights from the first mirror group are transmitted to the second mirror group through the optical switch array.
- 根据权利要求14所述的WSS,其特征在于,所述光开关阵列还用于调节来自所述第一镜组的第二子波长假光的偏转方向,其中,偏转方向调节后的所述第二子波长假光不导向所述偏振合束器;The WSS according to claim 14, wherein the optical switch array is also used to adjust the deflection direction of the second sub-wavelength false light from the first mirror group, wherein the first Two sub-wavelength false lights are not guided to the polarization beam combiner;所述偏振转换阵列用于调节来自所述偏振合束器的第二子波长信号光的偏振态,以衰减所述第二子波长信号光向所述输出端口传输的能量,所述第二子波长假光与所述第二子波长信号光的波长相同。The polarization conversion array is used to adjust the polarization state of the second sub-wavelength signal light from the polarization beam combiner, so as to attenuate the energy transmitted by the second sub-wavelength signal light to the output port, and the second sub-wavelength signal light The false wavelength light has the same wavelength as the second sub-wavelength signal light.
- 根据权利要求12至14中任一项所述的WSS,其特征在于,第三子波长信号光经过所述光开关阵列调节偏转方向后不导向所述偏振合束器;The WSS according to any one of claims 12 to 14, wherein the third sub-wavelength signal light is not guided to the polarization beam combiner after the deflection direction is adjusted by the optical switch array;所述偏振转换阵列用于调节来自所述偏振合束器的第三子波长假光的偏振态,以衰减所述第三子波长假光向所述输出端口传输的能量,所述第三子波长假光与所述第三子波长信号光的波长相同。The polarization conversion array is used to adjust the polarization state of the third sub-wavelength dummy light from the polarization beam combiner, so as to attenuate the energy transmitted by the third sub-wavelength dummy light to the output port, and the third sub-wavelength dummy light The false wavelength light has the same wavelength as the third sub-wavelength signal light.
- 根据权利要求12至16中任一项所述的WSS,其特征在于,所述WSS还包括第四镜组和第五镜组;The WSS according to any one of claims 12 to 16, wherein the WSS further comprises a fourth mirror group and a fifth mirror group;所述第四镜组用于对来自所述信号光输入端口的信号光先进行准直和光束整形再导向所述第一偏振转换装置,并对来自所述假光输入端口的假光先进行准直和光束整形再导向所述第一偏振转换装置;The fourth mirror group is used to collimate and beam-shape the signal light from the signal light input port before guiding it to the first polarization conversion device, and to firstly perform a collimation and beam shaping on the false light from the false light input port. collimating and beam shaping redirecting to said first polarization conversion means;所述第五镜组用于对来自所述第二色散元件的合波后的光先进行准直和光束整形再导向所述输出端口。The fifth mirror group is used to collimate and shape the combined light from the second dispersive element before guiding it to the output port.
- 根据权利要求12至17中任一项所述的WSS,其特征在于,所述第一镜组包括第一透镜、第二透镜和第三透镜;The WSS according to any one of claims 12 to 17, wherein the first lens group comprises a first lens, a second lens and a third lens;所述第一透镜用于透射来自所述第一色散元件的所述多个子波长信号光,或者,在所述第一方向上对来自所述第一色散元件的所述多个子波长信号光进行折射;The first lens is used to transmit the multiple sub-wavelength signal lights from the first dispersive element, or to transmit the multiple sub-wavelength signal lights from the first dispersive element in the first direction refraction;所述第二透镜用于透射来自所述第一色散元件的所述多个子波长假光,或者,在所述第一方向上对来自所述第一色散元件的所述多个子波长假光进行折射;The second lens is used to transmit the multiple sub-wavelength pseudo-lights from the first dispersive element, or to transmit the multiple sub-wavelength pseudo-lights from the first dispersive element in the first direction refraction;所述第三透镜用于在所述第二方向上对来自所述第一透镜的所述多个子波长信号光进行准直,并对来自所述第二透镜的所述多个子波长假光进行准直。The third lens is used to collimate the plurality of sub-wavelength signal lights from the first lens in the second direction, and collimate the plurality of sub-wavelength false lights from the second lens. collimation.
- 根据权利要求12至18中任一项所述的WSS,其特征在于,所述第二镜组包括第四透镜、第五透镜、第六透镜、第七透镜和反射镜;The WSS according to any one of claims 12 to 18, wherein the second lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens and a mirror;所述第四透镜用于在所述第二方向上对来自所述光开关阵列的子波长信号光进行汇聚,并对来自所述第一镜组的子波长假光进行汇聚;The fourth lens is used for converging the sub-wavelength signal light from the optical switch array in the second direction, and converging the sub-wavelength false light from the first lens group;所述第五透镜用于对来自所述第四透镜的子波长信号光进行光束整形;The fifth lens is used for beam shaping the sub-wavelength signal light from the fourth lens;所述第六透镜用于在所述第二方向上对来自所述第五透镜的子波长信号光进行准直并导向所述偏振合束器;The sixth lens is used to collimate the sub-wavelength signal light from the fifth lens in the second direction and guide it to the polarization beam combiner;所述第七透镜用于对来自所述第四透镜的子波长假光进行光束整形;The seventh lens is used for beam shaping the sub-wavelength false light from the fourth lens;所述反射镜用于将来自所述第七透镜的子波长假光反射至所述偏振合束器。The reflection mirror is used to reflect the sub-wavelength false light from the seventh lens to the polarization beam combiner.
- 根据权利要求12至19中任一项所述的WSS,其特征在于,所述第三镜组包括第八透镜和第九透镜;The WSS according to any one of claims 12 to 19, wherein the third lens group includes an eighth lens and a ninth lens;所述第八透镜用于在所述第二方向上对来自所述偏振分离器的子波长信号光进行汇聚,并对来自所述偏振分离器的子波长假光进行汇聚;The eighth lens is used for converging the sub-wavelength signal light from the polarization splitter in the second direction, and converging the sub-wavelength false light from the polarization splitter;所述第九透镜用于对来自所述第八透镜的子波长信号光和子波长假光进行光束整形。The ninth lens is used for beam shaping the sub-wavelength signal light and sub-wavelength dummy light from the eighth lens.
- 根据权利要求12至20中任一项所述的WSS,其特征在于,所述光开关阵列为硅基液晶LCOS,所述偏振转换阵列为硅基铁电液晶F-LCOS。The WSS according to any one of claims 12 to 20, wherein the optical switch array is liquid crystal on silicon LCOS, and the polarization conversion array is ferroelectric liquid crystal on silicon F-LCOS.
- 根据权利要求12至21中任一项所述的WSS,其特征在于,所述WSS还包括控制器,所述光开关阵列和所述偏振转换阵列由所述控制器进行控制。The WSS according to any one of claims 12 to 21, wherein the WSS further comprises a controller, and the optical switch array and the polarization conversion array are controlled by the controller.
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