CN113568241A - Double-channel all-optical wavelength conversion method - Google Patents
Double-channel all-optical wavelength conversion method Download PDFInfo
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- CN113568241A CN113568241A CN202110835419.9A CN202110835419A CN113568241A CN 113568241 A CN113568241 A CN 113568241A CN 202110835419 A CN202110835419 A CN 202110835419A CN 113568241 A CN113568241 A CN 113568241A
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/365—Non-linear optics in an optical waveguide structure
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Abstract
The invention discloses a double-channel all-optical wavelength conversion method, which adopts the scheme provided by the invention to realize all-optical wavelength conversion on two paths of reversely transmitted signals by using the same section of HNLF based on FWM effect, and different signals are transmitted in opposite directions in optical fibers, thereby avoiding crosstalk among signals caused by overlapping of the signals in time domain, frequency domain and polarization direction and improving the conversion speed; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Description
Technical Field
The invention relates to the technical field of wavelength conversion, in particular to a dual-channel all-optical wavelength conversion method.
Background
In all-optical networks, all information is always transmitted and exchanged by optical signals, and the switch performs routing according to the wavelength. Wavelength routing switching in the optical transmission network adopts a wavelength conversion technology, and the network capacity can be enlarged and the networking flexibility can be improved by reusing the wavelength. Wavelength conversion based on four-wave mixing (FWM) is the only way to achieve strictly transparent wavelength conversion, and is also the only way to achieve simultaneous conversion of one set of wavelengths to another, and the speed is high. But the conversion speed is limited by the FWM all-optical wavelength conversion of a single channel in the prior art. Therefore, a solution to the problem of limited switching speed is needed.
Disclosure of Invention
The invention provides a double-channel all-optical wavelength conversion method, which is used for solving the problem that the conversion speed is limited by single-channel FWM all-optical wavelength conversion in the prior art.
The invention provides a double-channel all-optical wavelength conversion method, which comprises the following steps:
the first signal light and the first pumping light are coupled through a first optical coupler, pass through a first amplifier and then are injected into the high-nonlinearity fiber along a first injection direction through a first circulator;
the second signal light and the second pumping light are coupled through a second optical coupler, pass through a second amplifier and then pass through a second circulator and are injected into the high-nonlinearity optical fiber along a second injection direction; the first implantation direction is opposite to the second implantation direction;
the first signal light, the first pump light, the second signal light and the second pump light injected into the high nonlinear optical fiber respectively generate two beams of first new wavelength optical signals and two beams of second new wavelength optical signals based on a four-wave mixing effect;
the two first new wavelength optical signals are output through a first circulator; the two second new wavelength optical signals are output through a second circulator.
Optionally, the first circulator and the second circulator are circulators with at least three ports;
when the first circulator and the second circulator are three-port circulators; the first circulator includes: a first port, a second port, and a third port; the second circulator includes: a fourth port, a fifth port and a sixth port;
the injecting the highly nonlinear optical fiber along a first injection direction through the first circulator comprises:
then the high-nonlinearity fiber is input through a first port of the first circulator and output through a second port and injected into the high-nonlinearity fiber;
correspondingly, the two first new wavelength optical signals are output through a first circulator, and the first new wavelength optical signals include:
the two first new wavelength optical signals are input through a second port of the first circulator and output through a third port;
and injecting the high-nonlinearity optical fiber along a second injection direction through a second circulator, wherein the injection comprises:
then the high-nonlinearity fiber is input through a fourth port of the second circulator and is output and injected into the high-nonlinearity fiber through a fifth port;
correspondingly, the two second new wavelength optical signals are output via a second circulator, including:
and the two second new wavelength optical signals are input through a fifth port of the second circulator and output through a sixth port.
Optionally, the coupling of the first signal light and the first pump light through a first optical coupler includes:
the first signal light and the first pump light are coupled through a first optical coupler at a ratio of 50:50 for optical coupling;
the second signal light and the second pump light are coupled through a second optical coupler, and the second optical coupler includes:
the second signal light and the second pump light are coupled through a second optical coupler to have a ratio of 50: a ratio of 50 for optical coupling.
Optionally, the injecting the high nonlinearity fiber in the first injection direction through the first circulator includes:
injecting a graphene-doped bidirectional structure optical fiber along a first injection direction through a first circulator;
the injecting the highly nonlinear optical fiber through the second circulator in a second injection direction includes:
injecting the graphene-doped bidirectional-structure optical fiber along a second injection direction through a second circulator;
correspondingly, the first signal light, the first pump light, the second signal light and the second pump light injected into the high nonlinear optical fiber respectively generate two beams of first new wavelength optical signals and two beams of second new wavelength optical signals based on a four-wave mixing effect, and the method includes:
the first signal light, the first pump light, the second signal light and the second pump light injected into the graphene-doped bidirectional-structure optical fiber respectively generate two beams of first new-wavelength optical signals and two beams of second new-wavelength optical signals based on a four-wave mixing effect.
Optionally, the two first new wavelength optical signals are output via a first circulator; the two second new wavelength optical signals are output through a second circulator, and the method includes:
the two first new wavelength optical signals are optical signals which are processed by all-optical signals based on a nonlinear effect, and the two first new wavelength optical signals are output through a first circulator; the two beams of second new wavelength optical signals are optical signals processed by all-optical signals based on a nonlinear effect, and the two beams of second new wavelength optical signals are output through a second circulator.
Optionally, the first signal light and the second signal light belong to different optical signals.
Optionally, in the step of generating two first new wavelength optical signals and two second new wavelength optical signals respectively by the first signal light, the first pump light, the second signal light, and the second pump light injected into the high nonlinear optical fiber based on a four-wave mixing effect, the four-wave mixing effect is replaced by a cross-phase modulation effect or a self-phase modulation effect.
Optionally, before the first signal light and the first pump light are coupled by the first optical coupler, the method includes:
the third pump light and the fourth pump light are optically coupled to form first pump light; and the fifth pump light and the sixth pump light are optically coupled to form second pump light.
The invention also provides a double-channel all-optical wavelength conversion method, which comprises the following steps:
the third signal light passes through a third amplifier and then is injected into the high-nonlinearity optical fiber along a third injection direction through a third circulator;
the fourth signal light passes through a fourth amplifier and a fourth circulator and is injected into the high-nonlinearity fiber along a fourth injection direction; the third implant direction is opposite to the fourth implant direction;
the third signal light and the fourth signal light injected into the high-nonlinearity optical fiber generate a signal spectrum broadening effect based on a self-phase modulation effect to form new broadened optical signals;
and outputting the optical signal after forming the new broadening through a third circulator and a fourth circulator respectively.
Optionally, the forming a new broadened optical signal includes:
adjusting the peak power of the signal spectrum;
the signal spectrum is broadened to cover the central wavelength of the third signal light and the fourth signal light, and output signals are filtered at the output ends of the third circulator and the fourth circulator respectively.
The invention provides a two-channel all-optical wavelength conversion method, which adopts the scheme provided by the invention to realize all-optical wavelength conversion on two paths of reversely transmitted signals by using the same section of HNLF based on FWM effect, and different signals are transmitted in opposite directions in optical fibers, thereby avoiding crosstalk among signals caused by overlapping of the signals in time domain, frequency domain and polarization direction and improving the conversion speed; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a two-channel all-optical wavelength conversion method according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the principle of two-channel all-optical wavelength conversion in the embodiment of the present invention.
Fig. 3 is a flowchart of another two-channel all-optical wavelength conversion method according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1:
an embodiment of the present invention provides a two-channel all-optical wavelength conversion method, where fig. 1 is a flowchart of the two-channel all-optical wavelength conversion method in the embodiment of the present invention, fig. 2 is a schematic diagram of a principle structure of two-channel all-optical wavelength conversion in the embodiment of the present invention, and with reference to fig. 1 and fig. 2, please refer to fig. 1 and fig. 2, the method includes the following steps:
step S101, coupling a first signal light and a first pumping light through a first optical coupler, a first amplifier, and injecting the first signal light and the first pumping light into a high-nonlinearity optical fiber along a first injection direction through a first circulator;
step S102, coupling the second signal light and the second pumping light through a second optical coupler, a second amplifier and a second circulator, and injecting the second signal light and the second pumping light into the high-nonlinearity fiber along a second injection direction; the first implantation direction is opposite to the second implantation direction;
step S103, respectively generating two beams of first new wavelength optical signals and two beams of second new wavelength optical signals by the first signal light, the first pump light, the second signal light and the second pump light which are injected into the high nonlinear optical fiber based on a four-wave mixing effect;
step S104, outputting the two first new wavelength optical signals through a first circulator; the two second new wavelength optical signals are output through a second circulator.
The working principle of the technical scheme is as follows: the scheme adopted by the embodiment is that the first signal light and the first pumping light are coupled through a first optical coupler, pass through a first amplifier and then pass through a first circulator and are injected into the high-nonlinearity fiber along a first injection direction; the second signal light and the second pumping light are coupled through a second optical coupler, pass through a second amplifier and then pass through a second circulator and are injected into the high-nonlinearity optical fiber along a second injection direction; the first implantation direction is opposite to the second implantation direction; the first signal light, the first pump light, the second signal light and the second pump light injected into the high nonlinear optical fiber respectively generate two beams of first new wavelength optical signals and two beams of second new wavelength optical signals based on a four-wave mixing effect; the two first new wavelength optical signals are output through a first circulator; the two second new wavelength optical signals are output through a second circulator.
Specifically, two paths of signal light and pump light are coupled by 50:50, amplified by an amplifier and injected into a high nonlinear fiber (HNLF) through a circulator along opposite directions, and two paths of signals in opposite directions in the fiber respectively generate two new wavelengths due to a four-wave mixing effect and are output through an output port of the circulator. Therefore, the problem of signal crosstalk between signals due to cross phase modulation (XPM) and four-wave mixing effect (FWM) is avoided by adopting the reverse transmission structure. And different optical signals enter the optical fiber from opposite directions through the circulator, and are output by the circulator after being subjected to all-optical signal processing based on the nonlinear effect in the optical fiber.
The circulator is a device for unidirectional annular transmission of electromagnetic waves, and the device with unidirectional annular characteristic is used in modern radar and microwave multi-path communication systems. The principle of the circulator is still the anisotropic nature of the magnetic field biased ferrite material. The microwave structure has microstrip type, waveguide type, strip line type and coaxial type, wherein most of microstrip three-terminal ring devices are used, ferrite material is used as medium, a conduction band structure is arranged on the microstrip three-terminal ring devices, and a constant magnetic field is applied to the microstrip three-terminal ring devices, so that the microstrip three-terminal ring devices have the ring characteristic. If the direction of the bias field is changed, the circulating direction changes.
It should be noted that different signals propagate in opposite directions in the optical fiber, and crosstalk between signals caused by overlapping of signals in time domain, frequency domain and polarization direction is avoided. The method has the advantages that all-optical wavelength conversion processing of two paths of signals is completed under the condition that only one section of HNLF is used, two different types of signal processing can be simultaneously performed on one path of signal, all-optical signal processing capacity of multi-channel optical signals is achieved, and the method has certain positive significance for exploring methods for reducing the complexity of complex optical network nodes and improving all-optical signal processing efficiency. Secondly, based on nonlinear effects such as cross phase modulation XPM, self phase modulation SPM, four-wave mixing effect FWM and the like in the bidirectional structure optical fiber, all-optical demultiplexing of time division multiplexing signals (OTDM), 2R or 3R all-optical regeneration, all-optical logic gates, code pattern conversion and the like can be realized.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the same section of HNLF is used for realizing all-optical wavelength conversion on two paths of reversely transmitted signals based on the FWM effect, and different signals are transmitted in opposite directions in the optical fiber, so that the crosstalk among the signals caused by the overlapping of the signals in the time domain, the frequency domain and the polarization direction is avoided, and the conversion speed is improved; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Example 2:
on the basis of embodiment 1, the first circulator and the second circulator are circulators with at least three ports;
when the first circulator and the second circulator are three-port circulators; the first circulator includes: a first port, a second port, and a third port; the second circulator includes: a fourth port, a fifth port and a sixth port;
the injecting the highly nonlinear optical fiber along a first injection direction through the first circulator comprises:
then the high-nonlinearity fiber is input through a first port of the first circulator and output through a second port and injected into the high-nonlinearity fiber;
correspondingly, the two first new wavelength optical signals are output through a first circulator, and the first new wavelength optical signals include:
the two first new wavelength optical signals are input through a second port of the first circulator and output through a third port;
and injecting the high-nonlinearity optical fiber along a second injection direction through a second circulator, wherein the injection comprises:
then the high-nonlinearity fiber is input through a fourth port of the second circulator and is output and injected into the high-nonlinearity fiber through a fifth port;
correspondingly, the two second new wavelength optical signals are output via a second circulator, including:
and the two second new wavelength optical signals are input through a fifth port of the second circulator and output through a sixth port.
The working principle of the technical scheme is as follows: the scheme adopted by the embodiment is that the first circulator and the second circulator are circulators with at least three ports; when the first circulator and the second circulator are three-port circulators; the first circulator includes: a first port, a second port, and a third port; the second circulator includes: a fourth port, a fifth port, and a sixth port. Then the high-nonlinearity fiber is input through a first port of the first circulator and output through a second port and injected into the high-nonlinearity fiber; the two first new wavelength optical signals are input through a second port of the first circulator, output through a third port, input through a fourth port of the second circulator and output through a fifth port to be injected into the high nonlinear optical fiber; and the two second new wavelength optical signals are input through a fifth port of the second circulator and output through a sixth port.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the same section of HNLF is used for realizing all-optical wavelength conversion on two paths of reversely transmitted signals based on the FWM effect, and different signals are transmitted in opposite directions in the optical fiber, so that the crosstalk among the signals caused by the overlapping of the signals in the time domain, the frequency domain and the polarization direction is avoided, and the conversion speed is improved; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Example 3:
on the basis of embodiment 1, the coupling of the first signal light and the first pump light via the first optical coupler includes:
the first signal light and the first pump light are coupled through a first optical coupler at a ratio of 50:50 for optical coupling;
the second signal light and the second pump light are coupled through a second optical coupler, and the second optical coupler includes:
the second signal light and the second pump light are coupled through a second optical coupler to have a ratio of 50: a ratio of 50 for optical coupling.
The working principle of the technical scheme is as follows: the scheme adopted by this embodiment is that the first signal light and the first pump light are coupled via a first optical coupler, and the scheme includes: the first signal light and the first pump light are coupled through a first optical coupler at a ratio of 50:50 for optical coupling; the second signal light and the second pump light are coupled through a second optical coupler, and the second optical coupler includes: the second signal light and the second pump light are coupled through a second optical coupler to have a ratio of 50: a ratio of 50 for optical coupling.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the same section of HNLF is used for realizing all-optical wavelength conversion on two paths of reversely transmitted signals based on the FWM effect, and different signals are transmitted in opposite directions in the optical fiber, so that the crosstalk among the signals caused by the overlapping of the signals in the time domain, the frequency domain and the polarization direction is avoided, and the conversion speed is improved; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Example 4:
on the basis of embodiment 1, the injecting the high nonlinear optical fiber in the first injection direction through the first circulator comprises:
injecting a graphene-doped bidirectional structure optical fiber along a first injection direction through a first circulator;
the injecting the highly nonlinear optical fiber through the second circulator in a second injection direction includes:
injecting the graphene-doped bidirectional-structure optical fiber along a second injection direction through a second circulator;
correspondingly, the first signal light, the first pump light, the second signal light and the second pump light injected into the high nonlinear optical fiber respectively generate two beams of first new wavelength optical signals and two beams of second new wavelength optical signals based on a four-wave mixing effect, and the method includes:
the first signal light, the first pump light, the second signal light and the second pump light injected into the graphene-doped bidirectional-structure optical fiber respectively generate two beams of first new-wavelength optical signals and two beams of second new-wavelength optical signals based on a four-wave mixing effect.
The working principle of the technical scheme is as follows: the present embodiment adopts a scheme that the injecting the high nonlinear optical fiber in the first injecting direction through the first circulator includes: injecting a graphene-doped bidirectional structure optical fiber along a first injection direction through a first circulator; the injecting the highly nonlinear optical fiber through the second circulator in a second injection direction includes: injecting the graphene-doped bidirectional-structure optical fiber along a second injection direction through a second circulator; the first signal light, the first pump light, the second signal light and the second pump light injected into the graphene-doped bidirectional-structure optical fiber respectively generate two beams of first new-wavelength optical signals and two beams of second new-wavelength optical signals based on a four-wave mixing effect.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the same section of HNLF is used for realizing all-optical wavelength conversion on two paths of reversely transmitted signals based on the FWM effect, and different signals are transmitted in opposite directions in the optical fiber, so that the crosstalk among the signals caused by the overlapping of the signals in the time domain, the frequency domain and the polarization direction is avoided, and the conversion speed is improved; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Example 5:
on the basis of embodiment 1, the two first new-wavelength optical signals are output through a first circulator; the two second new wavelength optical signals are output through a second circulator, and the method includes:
the two first new wavelength optical signals are optical signals which are processed by all-optical signals based on a nonlinear effect, and the two first new wavelength optical signals are output through a first circulator; the two beams of second new wavelength optical signals are optical signals processed by all-optical signals based on a nonlinear effect, and the two beams of second new wavelength optical signals are output through a second circulator.
The working principle of the technical scheme is as follows: the scheme adopted by the embodiment is that the two first new-wavelength optical signals are output through a first circulator; the two second new wavelength optical signals are output through a second circulator, and the method includes: the two first new wavelength optical signals are optical signals which are processed by all-optical signals based on a nonlinear effect, and the two first new wavelength optical signals are output through a first circulator; the two beams of second new wavelength optical signals are optical signals processed by all-optical signals based on a nonlinear effect, and the two beams of second new wavelength optical signals are output through a second circulator
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the same section of HNLF is used for realizing all-optical wavelength conversion on two paths of reversely transmitted signals based on the FWM effect, and different signals are transmitted in opposite directions in the optical fiber, so that the crosstalk among the signals caused by the overlapping of the signals in the time domain, the frequency domain and the polarization direction is avoided, and the conversion speed is improved; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Example 6:
in addition to embodiment 1, the first signal light and the second signal light belong to different optical signals.
The working principle of the technical scheme is as follows: the present embodiment adopts a scheme that the first signal light and the second signal light belong to different optical signals.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the same section of HNLF is used for realizing all-optical wavelength conversion on two paths of reversely transmitted signals based on the FWM effect, and different signals are transmitted in opposite directions in the optical fiber, so that the crosstalk among the signals caused by the overlapping of the signals in the time domain, the frequency domain and the polarization direction is avoided, and the conversion speed is improved; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Example 7:
on the basis of embodiment 1, in the two first new wavelength optical signals and the two second new wavelength optical signals respectively generated by the first signal light, the first pump light, the second signal light, and the second pump light injected into the high nonlinear optical fiber based on a four-wave mixing effect, the four-wave mixing effect is replaced by a cross-phase modulation effect or a self-phase modulation effect.
The working principle of the technical scheme is as follows: in the scheme adopted in this embodiment, the first signal light, the first pump light, the second signal light, and the second pump light injected into the high nonlinear optical fiber respectively generate two first new wavelength optical signals and two second new wavelength optical signals based on a four-wave mixing effect, and the four-wave mixing effect is replaced by a cross-phase modulation effect or a self-phase modulation effect.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the same section of HNLF is used for realizing all-optical wavelength conversion on two paths of reversely transmitted signals based on the FWM effect, and different signals are transmitted in opposite directions in the optical fiber, so that the crosstalk among the signals caused by the overlapping of the signals in the time domain, the frequency domain and the polarization direction is avoided, and the conversion speed is improved; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Example 8:
on the basis of embodiment 1, before the first signal light and the first pump light are coupled by the first optical coupler, the method includes:
the third pump light and the fourth pump light are optically coupled to form first pump light; and the fifth pump light and the sixth pump light are optically coupled to form second pump light.
The working principle of the technical scheme is as follows: in this embodiment, before the first signal light and the first pump light are coupled by the first optical coupler, the method includes: the third pump light and the fourth pump light are optically coupled to form first pump light; and the fifth pump light and the sixth pump light are optically coupled to form second pump light.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the same section of HNLF is used for realizing all-optical wavelength conversion on two paths of reversely transmitted signals based on the FWM effect, and different signals are transmitted in opposite directions in the optical fiber, so that the crosstalk among the signals caused by the overlapping of the signals in the time domain, the frequency domain and the polarization direction is avoided, and the conversion speed is improved; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Example 9:
the present embodiment provides a two-channel all-optical wavelength conversion method, fig. 3 is a flowchart of another two-channel all-optical wavelength conversion method in the embodiment of the present invention, please refer to fig. 3, the method includes the following steps:
step S301, injecting third signal light into a high-nonlinearity optical fiber through a third amplifier and a third circulator along a third injection direction;
step S302, injecting fourth signal light into a high-nonlinearity fiber through a fourth amplifier and a fourth circulator along a fourth injection direction; the third implant direction is opposite to the fourth implant direction;
step S303, generating a signal spectrum broadening effect on the third signal light and the fourth signal light injected into the high-nonlinearity optical fiber based on a self-phase modulation effect to form new broadened optical signals;
and step S304, outputting the newly formed and stretched optical signals through a third circulator and a fourth circulator respectively.
The working principle of the technical scheme is as follows: in the scheme adopted by the embodiment, third signal light passes through a third amplifier and then is injected into a high-nonlinearity fiber along a third injection direction through a third circulator; the fourth signal light passes through a fourth amplifier and a fourth circulator and is injected into the high-nonlinearity fiber along a fourth injection direction; the third implant direction is opposite to the fourth implant direction; the third signal light and the fourth signal light injected into the high-nonlinearity optical fiber generate a signal spectrum broadening effect based on a self-phase modulation effect to form new broadened optical signals; and outputting the optical signal after forming the new broadening through a third circulator and a fourth circulator respectively.
Specifically, by changing input light, only signal light is input, and by utilizing a self-phase modulation effect, two signal spectrums in the optical fiber are widened due to an SPM effect, the peak power of the signals is adjusted, so that the spectrums can be widened to cover original central wavelengths of the two signals, and output signals are filtered at the output ends of the two circulators respectively.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the same section of HNLF is used for realizing all-optical wavelength conversion on two paths of reversely transmitted signals based on the FWM effect, and different signals are transmitted in opposite directions in the optical fiber, so that the crosstalk among the signals caused by the overlapping of the signals in the time domain, the frequency domain and the polarization direction is avoided, and the conversion speed is improved; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
Example 10:
on the basis of embodiment 9, the forming of the new broadened optical signal includes:
adjusting the peak power of the signal spectrum;
the signal spectrum is broadened to cover the central wavelength of the third signal light and the fourth signal light, and output signals are filtered at the output ends of the third circulator and the fourth circulator respectively.
The working principle of the technical scheme is as follows: the scheme adopted by this embodiment is that the forming of the new broadened optical signal includes: adjusting the peak power of the signal spectrum; the signal spectrum is broadened to cover the central wavelength of the third signal light and the fourth signal light, and output signals are filtered at the output ends of the third circulator and the fourth circulator respectively. The spectrum of two signals in the optical fiber is broadened due to SPM effect by changing input light and only inputting signal light, and the peak power of the signals is adjusted to broaden the spectrum to cover the original central wavelength of the two signals, and output signals are filtered at the output ends of the two circulators respectively.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the same section of HNLF is used for realizing all-optical wavelength conversion on two paths of reversely transmitted signals based on the FWM effect, and different signals are transmitted in opposite directions in the optical fiber, so that the crosstalk among the signals caused by the overlapping of the signals in the time domain, the frequency domain and the polarization direction is avoided, and the conversion speed is improved; in addition, the scheme realizes that two paths of coupling signals are simultaneously and respectively processed under the condition of only one section of HNLF, reduces the number of used devices and simplifies the system structure.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A dual-channel all-optical wavelength conversion method is characterized by comprising the following steps:
the first signal light and the first pumping light are coupled through a first optical coupler, pass through a first amplifier and then are injected into the high-nonlinearity fiber along a first injection direction through a first circulator;
the second signal light and the second pumping light are coupled through a second optical coupler, pass through a second amplifier and then pass through a second circulator and are injected into the high-nonlinearity optical fiber along a second injection direction; the first implantation direction is opposite to the second implantation direction;
the first signal light, the first pump light, the second signal light and the second pump light injected into the high nonlinear optical fiber respectively generate two beams of first new wavelength optical signals and two beams of second new wavelength optical signals based on a four-wave mixing effect;
the two first new wavelength optical signals are output through a first circulator; the two second new wavelength optical signals are output through a second circulator.
2. The dual-channel all-optical wavelength conversion method according to claim 1, wherein the first circulator and the second circulator are circulators having at least three ports;
when the first circulator and the second circulator are three-port circulators; the first circulator includes: a first port, a second port, and a third port; the second circulator includes: a fourth port, a fifth port and a sixth port;
the injecting the highly nonlinear optical fiber along a first injection direction through the first circulator comprises:
then the high-nonlinearity fiber is input through a first port of the first circulator and output through a second port and injected into the high-nonlinearity fiber;
correspondingly, the two first new wavelength optical signals are output through a first circulator, and the first new wavelength optical signals include:
the two first new wavelength optical signals are input through a second port of the first circulator and output through a third port;
and injecting the high-nonlinearity optical fiber along a second injection direction through a second circulator, wherein the injection comprises:
then the high-nonlinearity fiber is input through a fourth port of the second circulator and is output and injected into the high-nonlinearity fiber through a fifth port;
correspondingly, the two second new wavelength optical signals are output via a second circulator, including:
and the two second new wavelength optical signals are input through a fifth port of the second circulator and output through a sixth port.
3. The dual-channel all-optical wavelength conversion method according to claim 1, wherein the first signal light and the first pump light are coupled via a first optical coupler, comprising:
the first signal light and the first pump light are coupled through a first optical coupler at a ratio of 50:50 for optical coupling;
the second signal light and the second pump light are coupled through a second optical coupler, and the second optical coupler includes:
the second signal light and the second pump light are coupled through a second optical coupler to have a ratio of 50: a ratio of 50 for optical coupling.
4. The dual-channel all-optical wavelength conversion method according to claim 1, wherein injecting the highly nonlinear optical fiber in a first injection direction through the first circulator comprises:
injecting a graphene-doped bidirectional structure optical fiber along a first injection direction through a first circulator;
the injecting the highly nonlinear optical fiber through the second circulator in a second injection direction includes:
injecting the graphene-doped bidirectional-structure optical fiber along a second injection direction through a second circulator;
correspondingly, the first signal light, the first pump light, the second signal light and the second pump light injected into the high nonlinear optical fiber respectively generate two beams of first new wavelength optical signals and two beams of second new wavelength optical signals based on a four-wave mixing effect, and the method includes:
the first signal light, the first pump light, the second signal light and the second pump light injected into the graphene-doped bidirectional-structure optical fiber respectively generate two beams of first new-wavelength optical signals and two beams of second new-wavelength optical signals based on a four-wave mixing effect.
5. The two-channel all-optical wavelength conversion method according to claim 1, wherein the two first new wavelength optical signals are output via a first circulator; the two second new wavelength optical signals are output through a second circulator, and the method includes:
the two first new wavelength optical signals are optical signals which are processed by all-optical signals based on a nonlinear effect, and the two first new wavelength optical signals are output through a first circulator; the two beams of second new wavelength optical signals are optical signals processed by all-optical signals based on a nonlinear effect, and the two beams of second new wavelength optical signals are output through a second circulator.
6. The two-channel all-optical wavelength conversion method according to claim 1, wherein the first signal light and the second signal light belong to different optical signals.
7. The dual-channel all-optical wavelength conversion method according to claim 1, wherein the first signal light, the first pump light, the second signal light, and the second pump light injected into the high nonlinear optical fiber respectively generate two first new wavelength optical signals and two second new wavelength optical signals based on a four-wave mixing effect, and the four-wave mixing effect is replaced by a cross-phase modulation effect or a self-phase modulation effect.
8. The dual-channel all-optical wavelength conversion method according to claim 1, wherein before the first signal light and the first pump light are coupled by the first optical coupler, the method comprises:
the third pump light and the fourth pump light are optically coupled to form first pump light; and the fifth pump light and the sixth pump light are optically coupled to form second pump light.
9. A dual-channel all-optical wavelength conversion method is characterized by comprising the following steps:
the third signal light passes through a third amplifier and then is injected into the high-nonlinearity optical fiber along a third injection direction through a third circulator;
the fourth signal light passes through a fourth amplifier and a fourth circulator and is injected into the high-nonlinearity fiber along a fourth injection direction; the third implant direction is opposite to the fourth implant direction;
the third signal light and the fourth signal light injected into the high-nonlinearity optical fiber generate a signal spectrum broadening effect based on a self-phase modulation effect to form new broadened optical signals;
and outputting the optical signal after forming the new broadening through a third circulator and a fourth circulator respectively.
10. The dual-channel all-optical wavelength conversion method according to claim 9, wherein said forming a new broadened optical signal comprises:
adjusting the peak power of the signal spectrum;
the signal spectrum is broadened to cover the central wavelength of the third signal light and the fourth signal light, and output signals are filtered at the output ends of the third circulator and the fourth circulator respectively.
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