CN113568243A - All-optical wavelength converter based on graphene double-pump four-wave mixing effect - Google Patents
All-optical wavelength converter based on graphene double-pump four-wave mixing effect Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3536—Four-wave interaction
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- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/3556—Semiconductor materials, e.g. quantum wells
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- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/35—Non-linear optics
- G02F1/365—Non-linear optics in an optical waveguide structure
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Abstract
The invention discloses a graphene-based all-optical wavelength converter with a double-pump four-wave mixing effect, wherein signal light emitted by a signal light source passes through a first polarization controller, the first pump light and the second pump light respectively pass through a second polarization controller and a third polarization controller to form double pump light with a preset polarization angle, the double pump light is coupled through a second optical coupler to form a first coupled pump light beam, and the first coupled pump light beam and the signal light passing through the first polarization controller are coupled through the first optical coupler to form a second coupled light beam; and the second coupling light beam is subjected to signal amplification through an erbium-doped fiber amplifier, the amplified light beam is injected into the optical fiber made of the graphene material, and a plurality of light beams with new wavelengths are formed through the third-order nonlinear effect of the graphene. The double-pump four-wave mixing effect and the graphene material are utilized to reduce the sensitivity of the polarization state of input light, and the conversion efficiency can be improved.
Description
Technical Field
The invention relates to the technical field of wavelength converters, in particular to a graphene-based all-optical wavelength converter with a double-pump four-wave mixing effect.
Background
The modern optical fiber communication technology is a communication network with high flexibility and survivability established by taking an all-optical network as a core and taking wavelength routing as a basis on the basis of a point-to-point wavelength division multiplexing system (WDM) and introducing optical cross-connection and add-drop multiplexing nodes, and an all-optical wavelength converter is one of the most important core components of the all-optical communication network, and the characteristics of conversion efficiency, bit error rate, conversion bandwidth and the like of the all-optical wavelength converter greatly influence the performance of the all-optical wavelength converter.
An ideal all-optical wavelength converter should have the advantages of insensitivity to polarization, wide tuning range, high signal-to-noise ratio, high conversion rate, and the like. The four-wave mixing effect is the only wavelength conversion which can be completely transparent to the modulation mode and the code rate at present, and higher conversion efficiency can be obtained. However, the four-wave mixing effect of a single pump requires a pump light with a large power, the wavelength conversion efficiency is inversely proportional to the wavelength interval, which limits the wavelength conversion interval, and in order to effectively generate the four-wave mixing effect, the wavelength of the pump light is consistent with the zero dispersion wavelength of the optical fiber, which results in a limited output wavelength range, the conversion efficiency is not high, and the requirements on the power, the polarization, the wavelength interval and the like of the pump light and the signal light are high.
Disclosure of Invention
The invention provides a graphene-based all-optical wavelength converter with a double-pump four-wave mixing effect, which is used for solving the problems that in the prior art, in order to effectively generate the four-wave mixing effect, the wavelength of pump light is consistent with the zero dispersion wavelength of optical fibers, so that the output wavelength range is limited, the conversion efficiency is not high, the requirements on the power, the polarization, the wavelength interval and the like of the pump light and the signal light are high, and the like.
The invention provides a graphene-based all-optical wavelength converter with a double-pump four-wave mixing effect, which is characterized by comprising the following components: the device comprises a double-pump light source, a signal light source, a polarization controller, an optical coupler, an erbium-doped fiber amplifier and an optical fiber comprising a graphene material;
the polarization controller comprises a first polarization controller, a second polarization controller and a third polarization controller;
the double-pump light source comprises a first pump light source and a second pump light source;
the optical coupler comprises a first optical coupler and a second optical coupler;
the first polarization controller is connected with the signal light source, the second polarization controller is connected with the first pump light source, and the third polarization controller is connected with the second pump light source; the second optical coupler is connected with the second polarization controller and the third polarization controller, and the first optical coupler is connected with the second optical coupler and the first polarization controller; the input end of the erbium-doped fiber amplifier is connected with the first optical coupler, and the output end of the erbium-doped fiber amplifier is connected with the optical fiber comprising the graphene material;
when the all-optical wavelength converter is in a working state, the signal light emitted by the signal light source passes through the first polarization controller, the first pump light emitted by the first pump light source, the second pump light emitted by the second pump light source, the first pump light and the second pump light respectively pass through the second polarization controller and the third polarization controller to form double pump light with a preset polarization angle, the double pump light is coupled through the second optical coupler to form a first coupled pump light beam, and the first coupled pump light beam and the signal light passing through the first polarization controller are coupled through the first optical coupler to form a second coupled light beam; and the second coupling light beam is subjected to signal amplification through the erbium-doped optical fiber amplifier, the amplified light beam is injected into the optical fiber of the graphene material, and a plurality of light beams with new wavelengths are formed through the third-order nonlinear effect of the graphene.
Optionally, the first pump light and the second pump light respectively pass through the second polarization controller and the third polarization controller to form a dual pump light with a preset polarization angle, where the preset polarization angle includes a polarization direction parallel and a polarization direction perpendicular.
Optionally, the first pump light is pump light with an adjustable wavelength, and the second pump light is pump light with a fixed wavelength.
Optionally, when the first pump light and the second pump light respectively pass through the second polarization controller and the third polarization controller to form dual pump light with parallel polarization directions, and the first coupling light beam and the signal light passing through the first polarization controller are coupled through the first optical coupler, the first polarization controller is adjusted to control the polarization direction of the signal light passing through the first polarization controller, and further to control an angle between the signal light passing through the first polarization controller and the first coupling pump light beam, and light beams with different numbers of wavelengths can be formed at different angles.
Optionally, the number range of the light beams with different numbers of wavelengths different from the signal light wavelength is greater than or equal to 4 and less than or equal to 9.
Optionally, in an angle between the signal light passing through the first polarization controller and the first coupled pump light beam, when the angle is in a non-vertical state between the signal light and the first coupled pump light beam, 9 light beams with new wavelengths different from the signal light wavelength are formed; the angle is perpendicular between the signal light and the first coupled pump beam, resulting in 4 new wavelength beams different from the signal light wavelength.
Optionally, when the first pump light and the second pump light pass through the second polarization controller and the third polarization controller respectively to form dual pump light with parallel polarization directions, a wavelength interval between the first pump light and the second pump light is a constant value, and when a wavelength interval between the dual pump light and the signal light is increased to a preset value, the conversion efficiency of the all-optical wavelength converter reaches a constant state.
Optionally, when the first pump light and the second pump light pass through the second polarization controller and the third polarization controller respectively to form dual pump light with vertical polarization directions, a wavelength frequency difference between the second pump light and the signal light with the fixed wavelength pump light is smaller than a preset value, and the smaller the preset value is, the more stable the conversion efficiency of the all-optical wavelength converter is.
Optionally, the optical fiber module further includes an optical filter, where the optical filter is disposed at an output end of the optical fiber including the graphene material, and is configured to filter out signal light and output a plurality of light beams with new wavelengths formed by a third-order nonlinear effect of the graphene.
Optionally, the optical fiber including the graphene material is a micro-nano optical fiber.
The invention provides a graphene-based all-optical wavelength converter with a double-pump four-wave mixing effect, and the scheme provided by the invention utilizes the double-pump four-wave mixing effect and uses a graphene material to replace a high-nonlinearity optical fiber, so that the sensitivity of an input light polarization state can be well reduced, a wider tuning range is obtained, the stability is relatively high, and the conversion efficiency can be improved.
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 schematic structural diagram of an all-optical wavelength converter based on a graphene two-pump four-wave mixing effect in 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.
The embodiment of the present invention provides an all-optical wavelength converter based on a graphene two-pump four-wave mixing effect, fig. 1 is a schematic structural diagram of the all-optical wavelength converter based on the graphene two-pump four-wave mixing effect in the embodiment of the present invention, please refer to fig. 1, where the converter includes the following components:
the optical fiber amplifier comprises a double-pump light source 001, a signal light source 002, a polarization controller, an optical coupler, an erbium-doped optical fiber amplifier 008 and an optical fiber 009 comprising graphene materials;
the polarization controllers include a first polarization controller 003, a second polarization controller 004, and a third polarization controller 005;
the double-pump light source 001 comprises a first pump light source 001-1 and a second pump light source 001-2;
the optical couplers include a first optical coupler 007 and a second optical coupler 006;
the first polarization controller 003 is connected to the signal light source 002, the second polarization controller 004 is connected to the first pump light source 001-1, and the third polarization controller 005 is connected to the second pump light source 001-2; the second optical coupler 006 is connected to the second polarization controller 004 and the third polarization controller 005, and the first optical coupler 007 is connected to the second optical coupler 006 and the first polarization controller 003; the input end of the erbium-doped fiber amplifier 008 is connected with the first optical coupler 007, and the output end of the erbium-doped fiber amplifier 008 is connected with the optical fiber 009 made of graphene materials;
when the all-optical wavelength converter is in a working state, the signal light emitted by the signal light source 002 passes through the first polarization controller 003, the first pump light emitted by the first pump light source 001-1 and the second pump light emitted by the second pump light source 001-2 respectively pass through the second polarization controller 004 and the third polarization controller 005 to form double pump light with a preset polarization angle, the double pump light is coupled through the second optical coupler 006 to form a first coupled pump light beam, and the first coupled pump light beam and the signal light passing through the first polarization controller 003 are coupled through the first optical coupler 007 to form a second coupled light beam; the second coupling light beam is subjected to signal amplification through the erbium-doped optical fiber amplifier 008, the amplified light beam is injected into the optical fiber made of the graphene material, and a plurality of light beams with new wavelengths are formed through the third-order nonlinear effect of the graphene.
The working principle of the technical scheme is as follows: an all-optical wavelength converter is a device that can convert a light wave with a signal from one wavelength input to another wavelength output, and can be used to realize the reuse and redistribution of the light wavelength and avoid the problem of wavelength contention. The present embodiment adopts a scheme that the all-optical wavelength converter includes the following components: a dual pump light source 001, a signal light source 002, a polarization controller, an optical coupler, an erbium doped fiber amplifier 008, and an optical fiber 009 including graphene material. And the polarization controllers include a first polarization controller 003, a second polarization controller 004, and a third polarization controller 005; the double-pump light source 001 comprises a first pump light source 001-1 and a second pump light source 001-2; the optical coupler includes a first optical coupler 007 and a second optical coupler 006. The connection relation of the devices is as follows: the first polarization controller 003 is connected to the signal light source 002, the second polarization controller 004 is connected to the first pump light source 001-1, and the third polarization controller 005 is connected to the second pump light source 001-2; the second optical coupler 006 is connected to the second polarization controller 004 and the third polarization controller 005, and the first optical coupler 007 is connected to the second optical coupler 006 and the first polarization controller 003; the input end of the erbium-doped fiber amplifier 008 is connected to the first optical coupler 007, and the output end of the erbium-doped fiber amplifier 008 is connected to the optical fiber 009 made of graphene materials.
In addition, the operation conditions between the above devices in the operating state are as follows: when the all-optical wavelength converter is in a working state, the signal light emitted by the signal light source 002 passes through the first polarization controller 003, the first pump light emitted by the first pump light source 001-1 and the second pump light emitted by the second pump light source 001-2 respectively pass through the second polarization controller 004 and the third polarization controller 005 to form double pump light with a preset polarization angle, the double pump light is coupled through the second optical coupler 006 to form a first coupled pump light beam, and the first coupled pump light beam and the signal light passing through the first polarization controller 003 are coupled through the first optical coupler 007 to form a second coupled light beam; the second coupling light beam is subjected to signal amplification through the erbium-doped optical fiber amplifier 008, the amplified light beam is injected into the optical fiber made of the graphene material, and a plurality of light beams with new wavelengths are formed through the third-order nonlinear effect of the graphene.
The beneficial effects of the above technical scheme are: the implementation of the all-optical wavelength converter in the prior art generally utilizes the nonlinear effect of an optical linear medium, and substantially converts or modulates intensity information of control light to information of amplitude, phase, frequency, polarization and the like of light with another wavelength.
In addition, the scheme solves the problem that single-pump four-wave mixing polarization sensitivity and conversion efficiency are affected along with the wavelength interval, and the graphene is used for replacing a high-nonlinearity optical fiber, so that the conversion efficiency is improved. Meanwhile, the polarization correlation in single-pump four-wave mixing wavelength conversion is overcome, and the wavelength conversion efficiency can be kept stable in a wide wavelength range.
The present invention provides another embodiment, in which the first pump light and the second pump light pass through the second polarization controller 004 and the third polarization controller 005 respectively to form a dual pump light having a predetermined polarization angle, and the predetermined polarization angle includes a polarization direction parallel and a polarization direction perpendicular.
The working principle of the technical scheme is as follows: the scheme adopted in this embodiment is that the first pump light passes through the second polarization controller 004 to adjust the polarization angle, and the second pump light passes through the third polarizer to adjust the polarization angle, so that the first pump light passing through the second polarization controller 004 and the second pump light passing through the third polarization controller 005 form double pump light, and the polarization angle between the first pump light passing through the second polarization controller 004 and the second pump light passing through the third polarization controller 005 can be controlled by controlling the first polarization controller 003 and the second polarization controller to be preset, so that the polarization angle relationship between the first pump light and the second pump light passing through the polarization controllers can reach a parallel state or a perpendicular state.
Specifically, in this embodiment, three light sources are used, which are a first pump light and a second pump light respectively, where the first pump light is tunable pump light, the second pump light is fixed-wavelength pump light, the first pump light and the second pump light respectively pass through the second polarization controller 004 and the third polarization controller 005, the polarization state is adjusted to ensure that the polarization directions of the two pump lights are parallel, and the conversion efficiency is maximum at this time. The wavelength interval between the first pump light and the second pump light is constant, the wavelength of the signal light is tuned, and the conversion efficiency is relatively constant along with the increase of the wavelength interval between the signal light and the pump light. Adjusting the polarization direction of the signal light will produce a different number of new wavelengths.
Secondly, signal light and double-pump light are coupled and amplified by an amplifier and then injected into optical fibers made of graphene materials, and a plurality of new wavelengths are generated due to the third-order nonlinear effect of the graphene. After the micro-nano optical fiber is modified by the graphene, the intensity of the newly generated wavelength is obviously enhanced, namely the conversion efficiency is improved to a certain degree.
Therefore, the two-pump four-wave mixing can be divided into two types, parallel two-pump and vertical two-pump, according to the difference of polarization states. The above describes the case of parallel double pumping, that is, the polarization directions of the first pump light and the second pump light are made parallel by adjusting the second polarization controller 004 and the third polarization controller 005, and the two pumps are parallel. In this case, nine new wavelengths are generated when the signal light is not perpendicular to the pump light; when the signal light is perpendicular to the double pump light, four new converted lights will be generated. The double-pump light source 001 with the mutually vertical polarization directions can be adopted to realize stable conversion efficiency and signal to noise ratio in a longer distance.
Therefore, by utilizing the double-pumped four-wave mixing effect and combining the optical fiber with the graphene material, the wavelength conversion efficiency and the SRS stimulated Raman effect can be improved to a great extent, and a plurality of wavelength conversion signals can be generated simultaneously.
The beneficial effects of the above technical scheme are: the scheme provided by the embodiment utilizes the double-pump four-wave mixing effect, and the graphene material is used for replacing the high-nonlinearity optical fiber, so that the sensitivity of the polarization state of input light can be well reduced, a wider tuning range is obtained, the stability is relatively high, and the conversion efficiency can be improved.
In another embodiment, the first pump light is a pump light with adjustable wavelength, and the second pump light is a pump light with fixed wavelength.
The working principle of the technical scheme is as follows: the scheme adopted in this embodiment is that the first pump light is pump light with an adjustable wavelength, and the second pump light is pump light with a fixed wavelength.
Specifically, in this embodiment, three light sources are used, which are a first pump light and a second pump light respectively, where the first pump light is tunable pump light, the second pump light is fixed-wavelength pump light, the first pump light and the second pump light respectively pass through the second polarization controller 004 and the third polarization controller 005, the polarization state is adjusted to ensure that the polarization directions of the two pump lights are parallel, and the conversion efficiency is maximum at this time. The wavelength interval between the first pump light and the second pump light is constant, the wavelength of the signal light is tuned, and the conversion efficiency is relatively constant along with the increase of the wavelength interval between the signal light and the pump light. Adjusting the polarization direction of the signal light will produce a different number of new wavelengths.
Secondly, signal light and double-pump light are coupled and amplified by an amplifier and then injected into optical fibers made of graphene materials, and a plurality of new wavelengths are generated due to the third-order nonlinear effect of the graphene. After the micro-nano optical fiber is modified by the graphene, the intensity of the newly generated wavelength is obviously enhanced, namely the conversion efficiency is improved to a certain degree.
Therefore, the two-pump four-wave mixing can be divided into two types, parallel two-pump and vertical two-pump, according to the difference of polarization states. The above describes the case of parallel double pumping, that is, the polarization directions of the first pump light and the second pump light are made parallel by adjusting the second polarization controller 004 and the third polarization controller 005, and the two pumps are parallel. In this case, nine new wavelengths are generated when the signal light is not perpendicular to the pump light; when the signal light is perpendicular to the double pump light, four new converted lights will be generated. The double-pump light source 001 with the mutually vertical polarization directions can be adopted to realize stable conversion efficiency and signal to noise ratio in a longer distance.
Therefore, by utilizing the double-pumped four-wave mixing effect and combining the optical fiber with the graphene material, the wavelength conversion efficiency and the SRS stimulated Raman effect can be improved to a great extent, and a plurality of wavelength conversion signals can be generated simultaneously.
The beneficial effects of the above technical scheme are: the scheme provided by the embodiment utilizes the double-pump four-wave mixing effect, and the graphene material is used for replacing the high-nonlinearity optical fiber, so that the sensitivity of the polarization state of input light can be well reduced, a wider tuning range is obtained, the stability is relatively high, and the conversion efficiency can be improved.
In another embodiment, when the first pump light and the second pump light are respectively formed into dual pump light with parallel polarization directions by the second polarization controller 004 and the third polarization controller 005, and the first coupled light beam and the signal light passing through the first polarization controller 003 are coupled by the first optical coupler 007, the polarization direction of the signal light passing through the first polarization controller 003 is controlled by adjusting the first polarization controller 003, and the angle between the signal light passing through the first polarization controller 003 and the first coupled pump light beam is further controlled, and light beams with different numbers of wavelengths are formed at different angles.
The working principle of the technical scheme is as follows: the scheme adopted in this embodiment is that when the first pump light and the second pump light respectively pass through the second polarization controller 004 and the third polarization controller 005 to form dual pump light with parallel polarization directions, and when the first coupled light beam and the signal light passing through the first polarization controller 003 are coupled through the first optical coupler 007, the polarization direction of the signal light passing through the first polarization controller 003 is controlled by adjusting the first polarization controller 003, and the angle between the signal light passing through the first polarization controller 003 and the first coupled pump light beam is further controlled, and light beams with different numbers of wavelengths can be formed at different angles.
Specifically, in this embodiment, three light sources are used, which are a first pump light and a second pump light respectively, where the first pump light is tunable pump light, the second pump light is fixed-wavelength pump light, the first pump light and the second pump light respectively pass through the second polarization controller 004 and the third polarization controller 005, the polarization state is adjusted to ensure that the polarization directions of the two pump lights are parallel, and the conversion efficiency is maximum at this time. The wavelength interval between the first pump light and the second pump light is constant, the wavelength of the signal light is tuned, and the conversion efficiency is relatively constant along with the increase of the wavelength interval between the signal light and the pump light. Adjusting the polarization direction of the signal light will produce a different number of new wavelengths.
Secondly, signal light and double-pump light are coupled and amplified by an amplifier and then injected into optical fibers made of graphene materials, and a plurality of new wavelengths are generated due to the third-order nonlinear effect of the graphene. After the micro-nano optical fiber is modified by the graphene, the intensity of the newly generated wavelength is obviously enhanced, namely the conversion efficiency is improved to a certain degree.
Therefore, the two-pump four-wave mixing can be divided into two types, parallel two-pump and vertical two-pump, according to the difference of polarization states. The above describes the case of parallel double pumping, that is, the polarization directions of the first pump light and the second pump light are made parallel by adjusting the second polarization controller 004 and the third polarization controller 005, and the two pumps are parallel. In this case, nine new wavelengths are generated when the signal light is not perpendicular to the pump light; when the signal light is perpendicular to the double pump light, four new converted lights will be generated. The double-pump light source 001 with the mutually vertical polarization directions can be adopted to realize stable conversion efficiency and signal to noise ratio in a longer distance.
Therefore, by utilizing the double-pumped four-wave mixing effect and combining the optical fiber with the graphene material, the wavelength conversion efficiency and the SRS stimulated Raman effect can be improved to a great extent, and a plurality of wavelength conversion signals can be generated simultaneously.
The beneficial effects of the above technical scheme are: the scheme provided by the embodiment utilizes the double-pump four-wave mixing effect, and the graphene material is used for replacing the high-nonlinearity optical fiber, so that the sensitivity of the polarization state of input light can be well reduced, a wider tuning range is obtained, the stability is relatively high, and the conversion efficiency can be improved.
The present invention provides another embodiment, in which the number range of the wavelengths different from the signal light wavelength in the light beams with different numbers of wavelengths is greater than or equal to 4 and less than or equal to 9.
The working principle of the technical scheme is as follows: the present embodiment adopts a scheme that the number range of the wavelengths different from the signal light wavelength in the light beams with different numbers of wavelengths is greater than or equal to 4 and less than or equal to 9.
Specifically, in this embodiment, three light sources are used, which are a first pump light and a second pump light respectively, where the first pump light is tunable pump light, the second pump light is fixed-wavelength pump light, the first pump light and the second pump light respectively pass through the second polarization controller 004 and the third polarization controller 005, the polarization state is adjusted to ensure that the polarization directions of the two pump lights are parallel, and the conversion efficiency is maximum at this time. The wavelength interval between the first pump light and the second pump light is constant, the wavelength of the signal light is tuned, and the conversion efficiency is relatively constant along with the increase of the wavelength interval between the signal light and the pump light. Adjusting the polarization direction of the signal light will produce a different number of new wavelengths.
Secondly, signal light and double-pump light are coupled and amplified by an amplifier and then injected into optical fibers made of graphene materials, and a plurality of new wavelengths are generated due to the third-order nonlinear effect of the graphene. After the micro-nano optical fiber is modified by the graphene, the intensity of the newly generated wavelength is obviously enhanced, namely the conversion efficiency is improved to a certain degree.
Therefore, the two-pump four-wave mixing can be divided into two types, parallel two-pump and vertical two-pump, according to the difference of polarization states. The above describes the case of parallel double pumping, that is, the polarization directions of the first pump light and the second pump light are made parallel by adjusting the second polarization controller 004 and the third polarization controller 005, and the two pumps are parallel. In this case, nine new wavelengths are generated when the signal light is not perpendicular to the pump light; when the signal light is perpendicular to the double pump light, four new converted lights will be generated. The double-pump light source 001 with the mutually vertical polarization directions can be adopted to realize stable conversion efficiency and signal to noise ratio in a longer distance.
Therefore, by utilizing the double-pumped four-wave mixing effect and combining the optical fiber with the graphene material, the wavelength conversion efficiency and the SRS stimulated Raman effect can be improved to a great extent, and a plurality of wavelength conversion signals can be generated simultaneously.
The beneficial effects of the above technical scheme are: the scheme provided by the embodiment utilizes the double-pump four-wave mixing effect, and the graphene material is used for replacing the high-nonlinearity optical fiber, so that the sensitivity of the polarization state of input light can be well reduced, a wider tuning range is obtained, the stability is relatively high, and the conversion efficiency can be improved.
In another embodiment, in the angle between the signal light passing through the first polarization controller 003 and the first coupled pump beam, which is a non-vertical state between the signal light and the first coupled pump beam, 9 new wavelength light beams different from the wavelength of the signal light are formed; the angle is perpendicular between the signal light and the first coupled pump beam, resulting in 4 new wavelength beams different from the signal light wavelength.
The working principle of the technical scheme is as follows: in the scheme adopted in this embodiment, in the angle between the signal light passing through the first polarization controller 003 and the first coupled pump light beam, when the angle is in a non-perpendicular state between the signal light and the first coupled pump light beam, 9 light beams with new wavelengths different from the wavelength of the signal light are formed; the angle is perpendicular between the signal light and the first coupled pump beam, resulting in 4 new wavelength beams different from the signal light wavelength.
Specifically, in this embodiment, three light sources are used, which are a first pump light and a second pump light respectively, where the first pump light is tunable pump light, the second pump light is fixed-wavelength pump light, the first pump light and the second pump light respectively pass through the second polarization controller 004 and the third polarization controller 005, the polarization state is adjusted to ensure that the polarization directions of the two pump lights are parallel, and the conversion efficiency is maximum at this time. The wavelength interval between the first pump light and the second pump light is constant, the wavelength of the signal light is tuned, and the conversion efficiency is relatively constant along with the increase of the wavelength interval between the signal light and the pump light. Adjusting the polarization direction of the signal light will produce a different number of new wavelengths.
Secondly, signal light and double-pump light are coupled and amplified by an amplifier and then injected into optical fibers made of graphene materials, and a plurality of new wavelengths are generated due to the third-order nonlinear effect of the graphene. After the micro-nano optical fiber is modified by the graphene, the intensity of the newly generated wavelength is obviously enhanced, namely the conversion efficiency is improved to a certain degree.
Therefore, the two-pump four-wave mixing can be divided into two types, parallel two-pump and vertical two-pump, according to the difference of polarization states. The above describes the case of parallel double pumping, that is, the polarization directions of the first pump light and the second pump light are made parallel by adjusting the second polarization controller 004 and the third polarization controller 005, and the two pumps are parallel. In this case, nine new wavelengths are generated when the signal light is not perpendicular to the pump light; when the signal light is perpendicular to the double pump light, four new converted lights will be generated.
Therefore, by utilizing the double-pumped four-wave mixing effect and combining the optical fiber with the graphene material, the wavelength conversion efficiency and the SRS stimulated Raman effect can be improved to a great extent, and a plurality of wavelength conversion signals can be generated simultaneously.
The beneficial effects of the above technical scheme are: the scheme provided by the embodiment utilizes the double-pump four-wave mixing effect, and the graphene material is used for replacing the high-nonlinearity optical fiber, so that the sensitivity of the polarization state of input light can be well reduced, a wider tuning range is obtained, the stability is relatively high, and the conversion efficiency can be improved.
In another embodiment, when the first pump light and the second pump light are respectively formed into dual pump lights with parallel polarization directions by the second polarization controller 004 and the third polarization controller 005, the wavelength interval between the first pump light and the second pump light is a constant value, and when the wavelength interval between the dual pump light and the signal light is increased to a preset value, the conversion efficiency of the all-optical wavelength converter reaches a constant state.
The working principle of the technical scheme is as follows: in the scheme adopted in this embodiment, when the first pump light and the second pump light pass through the second polarization controller 004 and the third polarization controller 005 respectively to form dual pump light with parallel polarization directions, a wavelength interval between the first pump light and the second pump light is a constant value, and when a wavelength interval between the dual pump light and the signal light is increased to a preset value, the conversion efficiency of the all-optical wavelength converter reaches a constant state.
Specifically, in this embodiment, three light sources are used, which are a first pump light and a second pump light respectively, where the first pump light is tunable pump light, the second pump light is fixed-wavelength pump light, the first pump light and the second pump light respectively pass through the second polarization controller 004 and the third polarization controller 005, the polarization state is adjusted to ensure that the polarization directions of the two pump lights are parallel, and the conversion efficiency is maximum at this time. The wavelength interval between the first pump light and the second pump light is constant, the wavelength of the signal light is tuned, and the conversion efficiency is relatively constant along with the increase of the wavelength interval between the signal light and the pump light. Adjusting the polarization direction of the signal light will produce a different number of new wavelengths.
Secondly, signal light and double-pump light are coupled and amplified by an amplifier and then injected into optical fibers made of graphene materials, and a plurality of new wavelengths are generated due to the third-order nonlinear effect of the graphene. After the micro-nano optical fiber is modified by the graphene, the intensity of the newly generated wavelength is obviously enhanced, namely the conversion efficiency is improved to a certain degree.
Therefore, the two-pump four-wave mixing can be divided into two types, parallel two-pump and vertical two-pump, according to the difference of polarization states. The above describes the case of parallel double pumping, that is, the polarization directions of the first pump light and the second pump light are made parallel by adjusting the second polarization controller 004 and the third polarization controller 005, and the two pumps are parallel. In this case, nine new wavelengths are generated when the signal light is not perpendicular to the pump light; when the signal light is perpendicular to the double pump light, four new converted lights will be generated.
Therefore, by utilizing the double-pumped four-wave mixing effect and combining the optical fiber with the graphene material, the wavelength conversion efficiency and the SRS stimulated Raman effect can be improved to a great extent, and a plurality of wavelength conversion signals can be generated simultaneously.
The beneficial effects of the above technical scheme are: the scheme provided by the embodiment utilizes the double-pump four-wave mixing effect, and the graphene material is used for replacing the high-nonlinearity optical fiber, so that the sensitivity of the polarization state of input light can be well reduced, a wider tuning range is obtained, the stability is relatively high, and the conversion efficiency can be improved.
The present invention provides another embodiment, in this embodiment, when the first pump light and the second pump light are respectively formed into a dual pump light with a vertical polarization direction by the second polarization controller 004 and the third polarization controller 005, the wavelength frequency difference between the second pump light with the fixed wavelength pump light and the signal light is smaller than a preset value, and the smaller the preset value is, the more stable the conversion efficiency of the all-optical wavelength converter is.
The working principle of the technical scheme is as follows: in the scheme adopted by this embodiment, when the first pump light and the second pump light pass through the second polarization controller 004 and the third polarization controller 005 respectively to form a dual-pump light with a vertical polarization direction, a wavelength frequency difference between the second pump light and the signal light with the fixed wavelength pump light is smaller than a preset value, and the smaller the preset value is, the more stable the conversion efficiency of the all-optical wavelength converter is. Therefore, in the case of vertical double pumping, the fixed second pump light must maintain a small frequency difference with the signal light, and the use of the double-pump light source 001 with mutually perpendicular polarization directions can stabilize the conversion efficiency and the signal-to-noise ratio over a long distance.
The beneficial effects of the above technical scheme are: the scheme provided by the embodiment utilizes the double-pump four-wave mixing effect, and the graphene material is used for replacing the high-nonlinearity optical fiber, so that the sensitivity of the polarization state of input light can be well reduced, a wider tuning range is obtained, the stability is relatively high, and the conversion efficiency can be improved.
The present invention provides another embodiment, in which the optical fiber further includes an optical filter, the optical filter is disposed at an output end of the optical fiber 009 including the graphene material, and is configured to filter out signal light and output a plurality of light beams with new wavelengths formed by a third-order nonlinear effect of the graphene.
The working principle of the technical scheme is as follows: the scheme adopted by this embodiment is that the optical fiber module further includes an optical filter, the optical filter is disposed at the output end of the optical fiber 009 including the graphene material, and is configured to filter out signal light and output a plurality of light beams with new wavelengths formed by a third-order nonlinear effect of the graphene. By arranging the optical filter, the existing signal light can be filtered out, and all converted light beams with new wavelengths are output.
The beneficial effects of the above technical scheme are: the scheme provided by the embodiment utilizes the double-pump four-wave mixing effect, and the graphene material is used for replacing the high-nonlinearity optical fiber, so that the sensitivity of the polarization state of input light can be well reduced, a wider tuning range is obtained, the stability is relatively high, and the conversion efficiency can be improved.
The invention provides another embodiment, in which the optical fiber 009 comprising the graphene material is a micro-nano optical fiber.
The working principle of the technical scheme is as follows: the scheme adopted by the embodiment is that the optical fiber 009 made of graphene materials is a micro-nano optical fiber. After the micro-nano optical fiber is modified by the graphene, the intensity of the newly generated wavelength is obviously enhanced, namely the conversion efficiency is improved to a certain degree.
The beneficial effects of the above technical scheme are: the scheme provided by the embodiment utilizes the double-pump four-wave mixing effect, and the graphene material is used for replacing the high-nonlinearity optical fiber, so that the sensitivity of the polarization state of input light can be well reduced, a wider tuning range is obtained, the stability is relatively high, and the conversion efficiency can be improved.
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. All-optical wavelength converter of two pumping four-wave mixing effect based on graphite alkene, its characterized in that includes: the device comprises a double-pump light source, a signal light source, a polarization controller, an optical coupler, an erbium-doped fiber amplifier and an optical fiber comprising a graphene material;
the polarization controller comprises a first polarization controller, a second polarization controller and a third polarization controller;
the double-pump light source comprises a first pump light source and a second pump light source;
the optical coupler comprises a first optical coupler and a second optical coupler;
the first polarization controller is connected with the signal light source, the second polarization controller is connected with the first pump light source, and the third polarization controller is connected with the second pump light source; the second optical coupler is connected with the second polarization controller and the third polarization controller, and the first optical coupler is connected with the second optical coupler and the first polarization controller; the input end of the erbium-doped fiber amplifier is connected with the first optical coupler, and the output end of the erbium-doped fiber amplifier is connected with the optical fiber comprising the graphene material;
when the all-optical wavelength converter is in a working state, the signal light emitted by the signal light source passes through the first polarization controller, the first pump light emitted by the first pump light source, the second pump light emitted by the second pump light source, the first pump light and the second pump light respectively pass through the second polarization controller and the third polarization controller to form double pump light with a preset polarization angle, the double pump light is coupled through the second optical coupler to form a first coupled pump light beam, and the first coupled pump light beam and the signal light passing through the first polarization controller are coupled through the first optical coupler to form a second coupled light beam; and the second coupling light beam is subjected to signal amplification through the erbium-doped optical fiber amplifier, the amplified light beam is injected into the optical fiber of the graphene material, and a plurality of light beams with new wavelengths are formed through the third-order nonlinear effect of the graphene.
2. The all-optical wavelength converter based on the graphene two-pump four-wave mixing effect according to claim 1, wherein the first pump light and the second pump light pass through the second polarization controller and the third polarization controller respectively to form a two-pump light with preset polarization angles, and the preset polarization angles include a parallel polarization direction and a perpendicular polarization direction.
3. The graphene-based two-pump four-wave mixing effect all-optical wavelength converter according to claim 2, wherein the first pump light is a tunable wavelength pump light, and the second pump light is a fixed wavelength pump light.
4. The all-optical wavelength converter of graphene-based two-pump four-wave mixing effect according to claim 3, wherein when the first pump light and the second pump light pass through the second polarization controller and the third polarization controller respectively to form two pump lights with parallel polarization directions, and when the first coupled light beam and the signal light passing through the first polarization controller are coupled by the first optical coupler, the first polarization controller is adjusted to control the polarization direction of the signal light passing through the first polarization controller, so as to further control an angle between the signal light passing through the first polarization controller and the first coupled pump light beam, and different angles form light beams with different numbers of wavelengths.
5. The all-optical wavelength converter based on the graphene two-pump four-wave mixing effect according to claim 4, wherein the number range of the light beams with different numbers of wavelengths different from the signal light wavelength is greater than or equal to 4 and less than or equal to 9.
6. The all-optical wavelength converter based on the graphene two-pump four-wave mixing effect according to claim 5, wherein in an angle between the signal light passing through the first polarization controller and the first coupled pump light beam, when the angle is in a non-vertical state between the signal light and the first coupled pump light beam, 9 new wavelength light beams different from the signal light wavelength are formed; the angle is perpendicular between the signal light and the first coupled pump beam, resulting in 4 new wavelength beams different from the signal light wavelength.
7. The all-optical wavelength converter based on the graphene two-pump four-wave mixing effect according to claim 3, wherein when the first pump light and the second pump light pass through the second polarization controller and the third polarization controller respectively to form two pump lights with parallel polarization directions, a wavelength interval between the first pump light and the second pump light is a constant value, and when the wavelength interval between the two pump lights and the signal light increases to a preset value, the conversion efficiency of the all-optical wavelength converter reaches a constant state.
8. The all-optical wavelength converter based on the graphene two-pump four-wave mixing effect according to claim 3, wherein when the first pump light and the second pump light pass through the second polarization controller and the third polarization controller respectively to form the two pump lights with vertical polarization directions, a wavelength frequency difference between the second pump light with the fixed wavelength and the signal light is smaller than a preset value, and the smaller the preset value, the more stable the conversion efficiency of the all-optical wavelength converter.
9. The all-optical wavelength converter based on the graphene two-pump four-wave mixing effect according to claim 1, further comprising an optical filter, disposed at an output end of the optical fiber including the graphene material, for filtering out signal light and outputting a plurality of light beams with new wavelengths formed by a third-order nonlinear effect of graphene.
10. The all-optical wavelength converter based on the graphene two-pump four-wave mixing effect according to claim 1, wherein the optical fiber comprising the graphene material is a micro-nano optical fiber.
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