WO2023134246A1 - Sous-ensemble optique bidirectionnel, dispositif de communication optique et système - Google Patents

Sous-ensemble optique bidirectionnel, dispositif de communication optique et système Download PDF

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Publication number
WO2023134246A1
WO2023134246A1 PCT/CN2022/125800 CN2022125800W WO2023134246A1 WO 2023134246 A1 WO2023134246 A1 WO 2023134246A1 CN 2022125800 W CN2022125800 W CN 2022125800W WO 2023134246 A1 WO2023134246 A1 WO 2023134246A1
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Prior art keywords
optical
photodetector
light
incident light
filter
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PCT/CN2022/125800
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English (en)
Chinese (zh)
Inventor
李书
王泽林
林华枫
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华为技术有限公司
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Publication of WO2023134246A1 publication Critical patent/WO2023134246A1/fr

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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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers

Definitions

  • the embodiments of the present application relate to the field of optical communication, and in particular, to an optical transceiver component, optical communication equipment, and a system.
  • the optical component is used to realize the transmission and/or reception of the optical signal, and the optical component includes an optical sending component and a light receiving component, which are respectively used to realize the transmission and reception of the optical signal.
  • optical components are required to have both the functions of light emission and light reception, so bidirectional optical subassembly (BOSA) appeared. Both the transmitting optical path and the receiving optical path inside the optical transceiver component are coupled with the optical fiber, and the optical signal is transmitted and received through the optical fiber.
  • BOSA bidirectional optical subassembly
  • the position of the light-emitting chip determines the position of the optical axis of the emitting light path
  • the position of the photodetector determines the position of the optical axis of the receiving light path.
  • the coupling of the emitting light path and the receiving light path may be difficult and the coupling effect is poor, resulting in the emission of the light path. And/or the coupling effect between the receiving optical path and the optical fiber is poor, which affects the light emitting effect and/or the light receiving effect of the optical sending component.
  • Embodiments of the present application provide an optical transceiver component, an optical communication device, and a system.
  • the above device or system reduces the coupling difficulty of the receiving and receiving optical axes by expanding the allowable deviation range of the photodetector.
  • the embodiment of the present application provides an optical transceiver component.
  • the optical transceiver component includes a light-emitting chip, a wavelength division multiplexer, a converging lens and a photodetector.
  • the light-emitting chip is used to provide outgoing light.
  • the wavelength division multiplexer is used to project the outgoing light on the first optical axis, and project the incident light on the first optical axis to the second optical axis.
  • the first optical axis is parallel to the second optical axis.
  • the converging lens is used for converging the incident light on the second optical axis to the photodetector.
  • a photodetector is used to receive the converged incident light.
  • the incident light on the second optical axis is converged to the photodetector by a converging lens.
  • Expand the allowable offset range (from ⁇ WDM+ ⁇ PD to ⁇ WDM+ ⁇ PD ⁇ f between the photosensitive surface of the photodetector and the first optical axis through the converging effect of the converging lens, f is greater than 1, see the description of the embodiment in Figure 5 for details ), which reduces the accuracy requirements for the assembly position of the photodetector and/or light-emitting chip.
  • the requirements on the assembly accuracy of the light-emitting chip and/or the photodetector can be relaxed, thereby reducing the accuracy requirements on the assembly equipment.
  • the coupling of the receiving and receiving optical circuits can be realized through relatively low-precision assembly equipment, and the product yield of the BOSA can be improved.
  • the incident light on the second optical axis is converged to the photodetector by the converging lens, so that the allowable deviation range between the photodetector and the first optical axis can be enlarged.
  • the allowable deviation range between the photodetector and the first optical axis is the allowable offset distance between the center of the photosensitive surface of the photodetector and the first optical axis.
  • the first optical axis is the optical axis where the optical transceiver component is coupled with the optical fiber.
  • the incident light on the second optical axis is converged to the photodetector by the converging lens, so that the allowable deviation range of the photodetector can be expanded.
  • the allowable deviation range of the photodetector is the allowable deviation range of the installation position of the photodetector itself.
  • the allowable deviation range of the installation position of the photodetector is within this distance, so the converging lens expands the allowable deviation range of the photodetector (from (x1+x2, y1+y2) to (x1'+x2', y1 '+y2'), see the description of the embodiment in Figure 6 for details).
  • the incident light on the second optical axis is converged to the photodetector by the converging lens, so that the allowable deviation range of the installation angle of the wavelength division multiplexer can be expanded.
  • the wavelength division multiplexer cannot project the incident light onto the photosensitive surface of the photodetector, so that the incident light deviates from the photosensitive surface, affecting light transmission and reception The light receiving effect of the component.
  • the allowable deviation range in the y-axis direction is expanded by the converging lens, thereby expanding the sum of the allowable deviation range ⁇ zLD of the light-emitting chip on the z-axis and the allowable deviation range ⁇ yPD of the photodetector on the y-axis.
  • the allowable deviation range in the x-axis direction is expanded by the converging lens, thereby expanding the sum of the allowable deviation range ⁇ zLD of the light-emitting chip on the x-axis and the allowable deviation range ⁇ xPD of the photodetector on the x-axis.
  • the optical transceiver component further includes a filter.
  • the filter is used to filter the incident light before or after convergence, so that the incident light after convergence entering the photodetector is within the target wavelength range.
  • the incident light from the optical fiber may be the optical signal transmitted by multiple light sources through the optical fiber, it includes optical signals of various wavelengths; or a part of the outgoing light (wavelength In the process of reflecting the outgoing light, the demultiplexer may refract part of the outgoing light to the second optical axis, that is, the optical path of the incident light); factors such as these may cause noise signals in the incident light. Therefore, the signal outside the target wavelength range is filtered out by the filter, and the signal-to-noise ratio of the incident light received by the photodetector is improved.
  • the filter is located on the optical path between the wavelength division multiplexer and the converging lens.
  • the filter is used to filter the incident light before converging, so that the incident light entering the converging lens is within the target wavelength range.
  • placing the filter on the optical path before the converging lens can reduce the optical path behind the converging lens. Under the same converging lens (magnification), the converging effect is better, and the coupling effect of the receiving and receiving optical circuits of the corresponding optical receiving and receiving components is also better.
  • placing the filter on the optical path before the converging lens can reduce the magnification of the converging lens under the same converging effect. Since the magnification of the converging lens is related to its size, the volume of the converging lens can be reduced, thereby reducing the volume of the entire optical transceiver assembly.
  • the filter is located on the optical path between the converging lens and the photodetector.
  • the filter is used to filter the condensed incident light, so that the condensed incident light incident on the photodetector is within the target wavelength range.
  • the filter is a filter, or a filter film on the surface of the converging lens.
  • the optical transceiver assembly further includes a support structure connected to the converging lens and a base.
  • the support structure is used to carry the wavelength division multiplexer.
  • the base is used to carry light-emitting chips, photodetectors and supporting structures.
  • the wavelength division multiplexer is supported by a support structure connected to the converging lens, so that the wavelength division multiplexer and the converging lens (and possible filters) are integrated on a connected structure to achieve integration
  • the structure can reduce the overall volume occupied by the wavelength division multiplexer and the converging lens (and possible filters), thereby reducing the volume of the entire optical transceiver assembly.
  • the integrated structure does not need to assemble scattered wavelength division multiplexers, converging lenses and filters.
  • the structure is simpler, the packaging process is simpler, and the manufacturing cost of the optical transceiver assembly is reduced.
  • the support structure includes one or more slopes.
  • the one or more slopes are used to support the wavelength division multiplexer.
  • the wavelength division multiplexer is supported by an inclined plane.
  • the supporting area of the wavelength division multiplexer is large, which reduces the stress on each component in the optical transceiver assembly, thereby reducing the possibility of deformation of each component and improving the stability of the structure.
  • the embodiment of the present application provides an optical network unit.
  • the optical network unit includes the optical transceiver component described in the first aspect.
  • the embodiment of the present application provides a passive optical network system.
  • the passive optical network system includes an optical line terminal, an optical distribution network and the optical network unit described in the second aspect. Wherein, the optical line terminal is connected with the optical distribution network.
  • the optical distribution network is connected with the optical network unit.
  • Fig. 1 is a network device configuration diagram of a passive optical network
  • FIG. 2a is a schematic diagram of a packaging structure of an optical transceiver component
  • Fig. 2b is a schematic diagram of a package structure of a miniaturized optical transceiver component
  • Fig. 3 is a coupling schematic diagram of the transceiver optical circuit of the optical transceiver component
  • FIG. 4 is a schematic structural diagram of an optical transceiver assembly provided in an embodiment of the present application.
  • FIG. 5 is a schematic diagram of the optical transceiver optical circuit coupling of the optical transceiver assembly provided by the embodiment of the present application;
  • FIG. 6 is a schematic diagram of the allowable deviation range ⁇ PD of the optical transceiver component provided by the embodiment of the present application.
  • Fig. 7 is a schematic diagram of the deviation correction effect of the optical transceiver assembly provided by the embodiment of the present application.
  • Fig. 8 is a schematic diagram of the allowable deviation range of the optical transceiver assembly provided by the embodiment of the present application on the y-axis and the z-axis;
  • FIG. 9 is a schematic structural diagram of another optical transceiver component provided by an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of an optical transceiver component with a filter provided in an embodiment of the present application.
  • FIG. 11 is a schematic diagram of the packaging structure of an optical transceiver assembly with a filter provided in an embodiment of the present application
  • FIG. 12 is a schematic diagram of a support structure in the optical transceiver assembly shown in FIG. 11;
  • Fig. 13 is a schematic diagram of the packaging structure of another optical transceiver component with a filter provided by the embodiment of the present application;
  • FIG. 14 is a schematic diagram of a support structure in the optical transceiver assembly shown in FIG. 13;
  • FIG. 15 is a network structure diagram of a passive optical network system according to an embodiment of the present application.
  • the optical communication network applied to the access network scenario mainly exists in the form of a passive optical network (PON).
  • PON passive optical network
  • Relevant communication equipment such as optical network unit (ONU), etc., mainly consists of optical transceiver components (bi-directional optical sub-assembly, BOSA), single boards and chassis for placing optical transceiver components.
  • BOSA optical transceiver components
  • an optical module in the optical line terminal 01 corresponds to an optical distribution network (ODN) 02, and serves a certain number of optical network units ONU 03.
  • ODN optical distribution network
  • one optical fiber distribution network 02 corresponds to x optical network units 03 (ONU1-ONUx), and each optical network unit 03 can represent a user.
  • the optical transceiver components in the optical network unit 03 are responsible for the photoelectric conversion and transmission of network signals, which is the basis for the normal communication of the entire network.
  • the BOSA includes a transmitting optical sub-assembly (TOSA), a receiving optical sub-assembly (ROSA) and a wavelength division multiplexer.
  • TOSA transmitting optical sub-assembly
  • ROSA receiving optical sub-assembly
  • a wavelength division multiplexer the role of the optical sending component TOSA is to convert electrical signals into optical signals, and input them into optical fibers for transmission.
  • the role of the optical receiving component ROSA is to receive the optical signal introduced by the optical fiber and convert it into an electrical signal.
  • the function of a wavelength division multiplexer is to transmit certain wavelengths of light while reflecting other wavelengths of light.
  • the optical transmission path is shown by the solid arrow in Figure 2a.
  • the light emitted by the optical transmission component TOSA passes through the wavelength division multiplexer in a straight line, and then enters the optical fiber for transmission.
  • the optical receiving path ROSA is shown by the dotted arrow in Figure 2a.
  • the optical signal transmitted by the optical fiber is reflected when it passes through the wavelength division multiplexer.
  • the optical receiving component ROSA is just located on the reflected optical path, thereby realizing the reception of the optical signal.
  • the traditional BOSA structure includes independently packaged TOSA and ROSA. If the independently packaged TOSA and ROSA are packaged again, the resulting BOSA has a larger volume.
  • a BOSA structure as shown in Fig. 2b is proposed.
  • TOSA and BOSA are not separately packaged.
  • the structures in TOSA and BOSA are packaged in the same transistor outline (TO), thereby reducing the volume of BOSA.
  • the light-emitting chip in TOSA, the photodetector in ROSA and the wavelength division multiplexer are packaged in the same TO.
  • the axis of the optical path of the outgoing light and the incident light is coupled to the axis of the fiber (that is, the axis of the optical path of the outgoing light and the incident light is aligned with the axis of the fiber), so as to realize the transmission of the outgoing light and the incident light.
  • the coupling effect between the outgoing light path and the incident light path may be poor.
  • the coupling effect between the outgoing light path and the incident light path and the axis of the optical fiber is poor, which affects the light emitting effect and/or light receiving effect of the optical transceiver component.
  • Both light-emitting chips and photodetectors have a certain tolerance range.
  • the light-emitting chip as long as the actual error between the axis of the outgoing light and the axis of the optical fiber is within this range, the light emission effect of the BOSA can be guaranteed.
  • the photodetector as long as the actual error between the axis of the incident light and the center of the photosensitive surface of the photodetector is within this range, the light receiving effect of the BOSA can be ensured.
  • the allowable deviation range of the light-emitting chip is much smaller than that of the photodetector.
  • the coupling of the receiving and receiving optical circuits is usually performed based on the axis of the output light of the light-emitting chip to ensure the light emission effect of the BOSA. Based on this, by controlling the deviation between the axis of the incident light and the center of the photosensitive surface of the photodetector within the allowable deviation range of the photodetector, the light receiving effect of the BOSA is ensured.
  • Fig. 3 represents the ideal position and ideal optical path through the solid line, and represents the actual position and the actual optical path caused by the above-mentioned deviation through the dotted line.
  • the outgoing light is reflected to the optical fiber through the wavelength division multiplexer, and the optical fiber is aligned with the optical axis of the outgoing light, resulting in the actual position being further to the left than the ideal position.
  • the optical fiber is located to the left of the ideal, causing the incident light to be located to the left of the ideal optical path.
  • Incident light to the left impinges on the photodetector, which may deviate from the photosensitive surface of the photodetector.
  • the photodetector may not be able to receive the optical signal from the optical fiber, or may only be able to receive part of the optical signal from the optical fiber (ie Only a part of the incident light spot is received by the photosensitive surface), which affects the light receiving effect of BOSA.
  • the embodiment shown in FIG. 3 takes the shift of the light-emitting chip in one direction as an example to illustrate the impact of the deviation on the light receiving effect of the BOSA, and does not limit the applicable scenarios of the embodiment of the present application.
  • the positional deviation of the photodetector may cause the axis of the incident light to deviate from the center of the photosensitive surface, thereby affecting the light receiving effect of the BOSA; or, the positional deviation or angular deviation of the wavelength division multiplexer may change the incident light to the position of the photodetector, thereby affecting the light-receiving effect of the BOSA; or, in the case of receiving and receiving optical circuit coupling based on the center of the photosensitive surface of the photodetector, any of the above-mentioned offsets or deviations may cause The deviation between the axis of the optical fiber determined based on the center of the photosensitive surface and the axis of the outgoing light is greater than the allowable deviation range, which may affect the light
  • the optical transceiver assembly 400 proposed in the embodiment of the present application includes a light emitting chip 401 , a wavelength division multiplexer (wavelength division multiplexing, WDM) 402 , a converging lens 403 and a photodetector 404 .
  • WDM wavelength division multiplexing
  • the light emitting chip 401 is used to provide outgoing light.
  • the wavelength division multiplexer 402 is used to project the outgoing light onto the first optical axis, and project the incident light on the first optical axis onto the second optical axis. Specifically, the wavelength division multiplexer 402 reflects the outgoing light onto the first optical axis, refracts the incident light on the first optical axis, and projects it onto a second optical axis parallel to the first optical axis.
  • the first optical axis is the coupling optical axis between the optical transceiver assembly 400 and the optical fiber. That is, when the optical transceiver assembly 400 is coupled with the optical fiber, the optical axis of the optical fiber is aligned with the first optical axis.
  • the converging lens 403 is used for converging the incident light on the second optical axis to the photodetector 404 to expand the allowable deviation range between the photodetector and the first optical axis.
  • the photodetector 404 is used to receive the converged incident light.
  • the light emitting chip is also called a laser diode (laser diode, LD).
  • the photodetector is also called a photodiode (photodiode, PD), which is not limited in this application.
  • the wavelength division multiplexer 402 may be a coated film of a quartz substrate, a film coated film of a polymer substrate, or the like.
  • the light-emitting chip 401 may be a Fabry-Perot (fabry-perot, FP) laser, a distributed feedback (distribute feedback, DFB) laser, or an electro-absorption modulated laser (electro-absorption modulated laser, EML), etc.
  • the photodetector 404 may be a photodiode (photodiode, PD), an avalanche diode (avalanche photodiode, APD) or the like.
  • the converging lens 403 may be a spherical lens, an aspheric lens, or the like. This application does not limit this.
  • optical transceiver assembly 400 provided by the embodiment of the present application is described above, and various beneficial effects of setting the converging lens 403 in the optical transceiver assembly 400 will be described below.
  • the converging lens 403 can expand the allowable deviation range between the photodetector and the first optical axis (fiber coupling optical axis).
  • the position where the outgoing light hits the wavelength division multiplexer 402 determines the position of the first optical axis.
  • the axis of the optical fiber coupled with the optical transceiver assembly 400 is completely aligned with the first optical axis. Therefore, the position where the outgoing light irradiates the wavelength division multiplexer 402 also determines the axis position of the optical fiber coupled with the optical transceiver assembly 400 .
  • the refractive index and thickness of the wavelength division multiplexer 402 determine the offset distance of the second optical axis relative to the first optical axis, which is referred to as ⁇ WDM in the embodiment of the present application.
  • the second optical axis determines where the incident light directly strikes the photosensitive detector 404 .
  • the photodetector 404 can ensure the receiving effect of the incident light. Therefore, the allowable deviation range between the center of the photosensitive surface of the photodetector and the first optical axis is ⁇ WDM+ ⁇ PD.
  • the allowable distance between the position where the incident light directly irradiates the photosensitive detector 404 and the center of the photosensitive surface of the photodetector 404 The offset range is still ⁇ PD.
  • the incident light on the second optical axis is converged by the converging lens 403, and the position irradiated on the photodetector 404 is closer to the center of the photosensitive surface, so the allowable deviation between the incident light on the second optical axis and the center of the photosensitive surface
  • the shift range is ⁇ PD ⁇ f, where f is the magnification of the converging lens 403, and f is greater than 1.
  • the allowable deviation range between the coupling axis (i.e. the first optical axis) of the optical transceiver assembly and the optical fiber and the center of the photosensitive surface of the photodetector is from ⁇ WDM+ ⁇ PD is expanded to ⁇ WDM+ ⁇ PD ⁇ f, which lowers the accuracy requirement on the assembly position of photodetectors and/or light emitting chips.
  • the requirements on the assembly accuracy of the light-emitting chip and/or the photodetector can be relaxed, thereby reducing the accuracy requirements on the assembly equipment.
  • the coupling of the receiving and receiving optical circuits can be realized through relatively low-precision assembly equipment, and the product yield rate can be improved.
  • the axis of the optical fiber is completely aligned with the first optical axis. It should be noted that the difference between the optical fiber axis and the first optical axis may also be within the allowable deviation range ⁇ LD of the light-emitting chip. Within ⁇ LD, the light emission effect of BOSA can be guaranteed, and the loss of optical signals is small. No limit.
  • the converging lens 403 can expand the allowable deviation range between the photodetector and the first optical axis on the one hand, and can also increase the allowable deviation range of the photodetector itself (ie, ⁇ PD shown in FIG. 5 ). As shown in Figure 6, through the converging lens, the size of the incident light spot can be reduced. Thereby expanding the distance between the incident light spot and the edge of the photosensitive surface, thereby expanding the allowable deviation range ⁇ PD of the photodetector from (x1+x2, y1+y2) to (x1'+x2', y1'+y2').
  • the positional deviation of the photodetector may cause the center of the incident light axis to be far from the center of the photosensitive surface, thereby affecting the light receiving effect of BOSA. Then, by enlarging ⁇ PD as shown in FIG. 6 , the deviation distance can be made within the range of ⁇ PD, thereby ensuring the light receiving effect of BOSA and improving the product yield of BOS.
  • the BOSA structure provided by the embodiment of the present application can expand ⁇ PD, that is, expand the allowable deviation range of the photodetector. Thereby reducing the accuracy requirements for assembly equipment.
  • the effects shown in FIG. 5 and the effects shown in FIG. 6 may also be superimposed.
  • the optical transceiver assembly 400 provided by the embodiment of the present application expands the allowable deviation range between the photodetector and the first optical axis from ⁇ PD to ⁇ PD ⁇ f.
  • the expansion of ⁇ PD by the converging lens 403 described in the embodiment shown in FIG. 6 further enhances the effect of expanding the allowable deviation range between the photodetector and the first optical axis. Thereby further reducing the accuracy requirements for assembly equipment and improving product yield.
  • the angle of the wavelength division multiplexer can also be corrected through the converging lens, so that the incident light
  • the converging projection is projected onto the photosensitive surface of the photodetector, thereby expanding the allowable deviation range of the installation angle of the wavelength division multiplexer.
  • the outgoing light enters the wavelength division multiplexer at an angle of 45°. Reflected by the wavelength division multiplexer 402 , an included angle of 90° is formed between the outgoing light entering the optical fiber and the outgoing light exiting the light-emitting chip 401 .
  • the photosensitive surface of the photodetector 404 is parallel to the light emitted from the light-emitting chip 401 , and the refraction of the incident light by the wavelength division multiplexer 402 does not change the direction of the incident light. Therefore, the incident light from the optical fiber is refracted by the wavelength division multiplexer 402 and then vertically enters the photosensitive surface of the photodetector 404 .
  • the angle between the outgoing light entering the optical fiber and the outgoing light exiting the light-emitting chip 401 is greater than 90°.
  • the converging lens 403 Through the converging lens 403, the incident light deviated from the photosensitive surface is converged to the photosensitive surface, thereby ensuring the light receiving effect of the BOSA. Moreover, the allowable deviation range of the installation angle of the wavelength division multiplexer is expanded.
  • the converging lens 403 can also expand the sum of the allowable deviation range of the photodetector and the allowable deviation range of the light-emitting chip.
  • ⁇ PD is the allowable offset distance of the incident light of the photodetector.
  • ⁇ y is the allowable deviation distance between the center of the photosensitive surface of the photodetector and the incident light, that is, the allowable deviation range between the center of the photosensitive surface and the second optical axis.
  • the allowable deviation distance can be reasonably allocated on the z-axis of the light-emitting chip and the y-axis of the photodetector, thereby reducing the difficulty of position control in a certain direction.
  • ⁇ yPD+ ⁇ zLD ⁇ yPD ⁇ f the coupling effect of the receiving and receiving optical circuits on the y-axis (z-axis) can be guaranteed.
  • the coupling effect of the receiving and receiving optical circuits on the x-axis can be guaranteed.
  • ⁇ yPD is the allowable deviation range of the photodetector on the y-axis
  • ⁇ zLD is the allowable deviation range of the light-emitting chip on the z-axis
  • ⁇ PD is the allowable deviation range of the photodetector itself.
  • ⁇ xPD and ⁇ xLD represent the allowable deviation ranges of the photodetector and the light-emitting chip on the x-axis, respectively.
  • production equipment such as manipulators
  • a larger tolerance to the light-emitting chip
  • a smaller tolerance is assigned to the photodetector on the y-axis.
  • the tolerance range ( ⁇ PD, ⁇ yPD, ⁇ xPD, ⁇ zLD, ⁇ xLD, etc.) described in the embodiments of the present application may represent the tolerance range between the outgoing light and the optical axis of the incident light, or may represent The optical axis of the incident light and the tolerance range obtained by additional consideration of the exit light and the incident light spot are not limited in this application.
  • the requirements on the assembly accuracy of the light-emitting chip and/or the photodetector can be relaxed. Thereby reducing the accuracy requirements for assembly equipment.
  • the coupling of the receiving and receiving optical circuits can be realized through relatively low-precision assembly equipment, and the product yield rate can be improved.
  • the above description of the allowable deviation range is a schematic description. In the actual optical path, there may be subtle differences between the allowable deviation range and the actual deviation range due to the deviation of the assembly angle of the WDM, the deviation of the concentricity of the light outlet of the light-emitting chip, the deviation of the photosensitive area of the photodetector, and the deviation of the height. These also belong to the scope of the present application.
  • the beneficial effects of the multiple aspects described in the embodiments of FIG. 5 to FIG. 8 can exist independently in the optical transceiver assembly provided in the embodiment of the present application, or can exist in combination, which is not limited in the present application.
  • the converging lens 403 in the optical transceiver assembly 400 can expand the allowable deviation range between the photodetector and the first optical axis (see FIG. 5 for details), and can also increase the allowable deviation range ⁇ PD( See Figure 6 for details).
  • the embodiment of the present application also provides an extended structure of the optical transceiver component.
  • the positions of the photodetector 404 and the light emitting chip 401 can be exchanged.
  • the structure after the exchange is shown in Figure 9.
  • the light emitting chip 401 is used to provide outgoing light.
  • the wavelength division multiplexer 402 is used to refract the outgoing light, so as to project the outgoing light onto the first optical axis.
  • the wavelength division multiplexer 402 is also used to reflect the incident light on the first optical axis to the second optical axis.
  • the converging lens 403 is used for converging the incident light on the second optical axis to the photodetector, so as to expand the allowable deviation range between the photodetector and the third optical axis.
  • the third optical axis is the optical axis after the first optical axis is reflected on the wavelength division multiplexer 402 , and is also the optical axis of the outgoing light emitted from the light-emitting chip.
  • the structure shown in FIG. 9 differs only in the directions of incident light and outgoing light. Therefore, the structure shown in FIG. 9 has the coupling influence relationship between outgoing light and incident light shown in FIG. 4 , so the corresponding descriptions and beneficial effects can refer to the descriptions of FIGS. 4 to 8 , and will not be repeated here.
  • a filter may also be provided on the optical path of the incident light to filter the incident light.
  • a filter 405 is further included on the optical path between the wavelength division multiplexer 402 and the converging lens 403 of the optical transceiver assembly 400 .
  • the filter is used to filter the incident light before being converged, so that the incident light entering the converging lens 403 is within the target wavelength range.
  • the converged incident light incident on the photodetector 404 is within the target wavelength range.
  • the target wavelength range is the wavelength range of the optical signal received by the photodetector. Due to the transmission of optical signals through optical line terminals, optical transmission networks, optical fibers, etc., noise signals may be generated. Therefore, the signal outside the target wavelength range is filtered out by the filter, and the signal-to-noise ratio of the incident light received by the photodetector is improved.
  • the filter 405 may also be placed on the optical path between the converging lens 403 and the photodetector 404 .
  • the filter 405 is used to filter the converged incident light, so that the converged incident light entering the photodetector 404 is within the target wavelength range, which is not limited in the present application.
  • the wavelength division multiplexer 402 and the filter 405 can be supported by a supporting structure, so as to reduce the difficulty of process in the production and assembly process.
  • the TO package of the optical transceiver assembly 400 includes a light-emitting chip 401, a wavelength division multiplexer 402, a converging lens 403, a photodetector 404, a filter 405, a support structure 406, a base and a cap lens .
  • the TO base supports the light-emitting chip 401 through a laser diode sub (LD SUB), and supports the photodetector 404 through a photodiode sub (PD SUB).
  • LD SUB laser diode sub
  • PD SUB photodiode sub
  • the supporting structure 406 is connected with the converging lens 403 and is used for supporting the wavelength division multiplexer 402 . Specifically, as shown in FIG. 12 , the support structure 406 includes two slopes. The two slopes are used to support the wavelength division multiplexer 402 .
  • FIG. 12 is only an example of the support structure 406 , and does not limit the number of slopes included in the support structure 406 .
  • the support structure 406 may include one or more slopes, which is not limited in the present application.
  • the converging lens 403 includes at least one convex surface for converging incident light.
  • Converging lens 403 may also include a flat surface, which may be used to place filter 405 .
  • the converging lens includes a flat surface, which is used to hold the filter 405 , which can be connected to a support structure 406 .
  • the convex surface opposite to the plane of the converging lens 403 is used to condense the incident light.
  • the structures of the converging lens 403 and the support structure 406 may also be as shown in FIGS. 13 and 14 .
  • the convex surface of the converging lens 403 is connected to the supporting structure 406 for converging incident light.
  • the plane opposite to the convex surface of the converging lens 403 is used to fix the filter 405 .
  • the converging lens 403 and the supporting structure 406 in FIGS. 11 and 12 After the incident light from the optical fiber is refracted by the wavelength division multiplexer 402 , it first passes through the filter 405 and then the converging lens 403 to achieve convergence of the incident light. Placing the filter 405 on the optical path before the converging lens 403 can reduce the optical path after the converging lens 403 . Under the same magnification, the convergence effect is better, and the coupling effect of the corresponding optical transceiver component 400 is also better.
  • placing the filter 405 on the optical path before the converging lens 403 can reduce the magnification of the converging lens 403 under the same converging effect. Since the magnification of the converging lens 403 is related to the size, the volume of the converging lens 403 can be reduced, thereby reducing the volume of the entire optical transceiver assembly 400 .
  • the filter 405 can be fixed on the plane of the converging lens 403 by coating, and the filter 405 is a filter film at this time.
  • the filter 405 can also be fixed on the plane of the converging lens 403 by optical glue, and the filter 405 is a filter at this time.
  • the present application does not limit the shape and fixing method of the filter 405 .
  • the condenser lens 403 may also not include a plane. In this configuration, the converging lens 403 is not used for the fixed filter 405 .
  • the wavelength division multiplexer is supported by a support structure connected with the converging lens, so that the wavelength division multiplexer and the converging lens (and possible filters) are integrated on a connected structure, which can reduce the The overall volume occupied by the wavelength division multiplexer and the converging lens (and possibly existing filters) reduces the volume of the entire optical transceiver assembly.
  • optical transceiver assembly shown in FIG. 1 may include the structure of the optical transceiver assembly 400 provided in the embodiment of the present application.
  • the ONU and the PON system including the structure of the optical transceiver assembly 400 belong to the protection scope of the embodiment of the present application.
  • An optical network unit is formed by connecting the components 400 in any of the above embodiments to a single board and placing them in a chassis.
  • FIG. 15 When the above optical network unit is applied to a passive optical network system, the structure of the passive optical network system is shown in FIG. 15 , including: an optical line terminal 100 , an optical distribution network 200 , and an optical network unit 300 . Wherein, the optical network unit 300 is provided with an optical transceiver component 400 . The optical distribution network 200 is connected to the optical line terminal 100; the optical network unit 300 is connected to the optical distribution network 200.
  • the optical transceiver assembly 400 provided in the embodiment of the present application and the passive optical network system including the optical transceiver assembly 400 can realize the reception of optical signals from optical fibers and the transmission of optical signals through optical fibers.
  • the shell structure of the optical transceiver assembly 400 is applicable to the existing BOSA shell structure, which facilitates the realization of the fabrication and packaging process, avoids the complicated fabrication of the external tube body, improves the fabrication efficiency and the yield rate, and thus reduces the cost of optical transceivers. Construction costs of the assembly 400, ONU and passive optical network system.
  • the disclosed system, device and method can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
  • the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disc and other media that can store program codes. .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

L'invention concerne un sous-ensemble optique bidirectionnel (400), un dispositif de communication optique et un système qui sont utilisés pour réduire la difficulté de couplage d'un trajet de transmission optique et d'un trajet de réception optique. Le sous-ensemble optique bidirectionnel (400) comprend : une puce électroluminescente (401), qui est utilisée pour fournir une lumière émergente ; un multiplexeur par répartition en longueur d'onde (402) qui est utilisé pour projeter la lumière émergente sur un premier axe optique, et projeter, sur un second axe optique, une lumière incidente sur le premier axe optique, le premier axe optique étant parallèle au second axe optique ; une lentille convergente (403), qui est utilisée pour faire converger, sur un détecteur photoélectrique (404), une lumière incidente sur le second axe optique, de façon à étendre une plage d'écart admissible entre le détecteur photoélectrique (404) et le premier axe optique ; et le détecteur photoélectrique (404), qui est utilisé pour recevoir la lumière incidente ayant convergé.
PCT/CN2022/125800 2022-01-11 2022-10-18 Sous-ensemble optique bidirectionnel, dispositif de communication optique et système WO2023134246A1 (fr)

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CN202210028763.1A CN116466444A (zh) 2022-01-11 2022-01-11 一种光收发组件、光通信设备和***
CN202210028763.1 2022-01-11

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003279808A (ja) * 2002-03-25 2003-10-02 Matsushita Electric Ind Co Ltd 光送受信モジュール
US20060153023A1 (en) * 2005-01-07 2006-07-13 Naoko Hikichi Optical Module
JP2010191231A (ja) * 2009-02-19 2010-09-02 Hitachi Ltd 光モジュール
JP2010286683A (ja) * 2009-06-12 2010-12-24 Nippon Telegr & Teleph Corp <Ntt> ３波長多重光送受信モジュール
CN110417476A (zh) * 2019-07-05 2019-11-05 华为技术有限公司 一种tosa、bosa、光模块以及光网络设备

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003279808A (ja) * 2002-03-25 2003-10-02 Matsushita Electric Ind Co Ltd 光送受信モジュール
US20060153023A1 (en) * 2005-01-07 2006-07-13 Naoko Hikichi Optical Module
JP2010191231A (ja) * 2009-02-19 2010-09-02 Hitachi Ltd 光モジュール
JP2010286683A (ja) * 2009-06-12 2010-12-24 Nippon Telegr & Teleph Corp <Ntt> ３波長多重光送受信モジュール
CN110417476A (zh) * 2019-07-05 2019-11-05 华为技术有限公司 一种tosa、bosa、光模块以及光网络设备

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