CN114355696A - Polarization multiplexing signal wavelength conversion device and method based on optical fiber ring crosstalk elimination - Google Patents
Polarization multiplexing signal wavelength conversion device and method based on optical fiber ring crosstalk elimination Download PDFInfo
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Abstract
The invention discloses a polarization multiplexing signal wavelength conversion device and method based on optical fiber ring crosstalk elimination in the field of all-optical wavelength conversion. The optical fiber ring adopted by the invention consists of a Polarization Beam Splitter (PBS), a high nonlinear optical fiber (HNLF) and a Polarization Controller (PC). PBS decomposes the coupled pump light and polarization multiplexing signal into two polarization mode signals in x direction and y direction, the polarization mode signal in x direction enters HNLF clockwise, the polarization mode signal in y direction enters HNLF counterclockwise, and four-wave mixing is performed in HNLF independently in x polarization direction and y polarization direction. According to the scheme, a signal compensation digital signal processing unit is not needed, the system cost is reduced, and the practicability is high. The invention can eliminate the channel crosstalk caused by the nonlinear polarization rotation effect of the polarization multiplexing signal in the wavelength conversion process, and improves the performance of the system. And the signal compensation digital signal processing unit is not needed, and the device has the characteristics of simple structure, low cost and strong practicability.
Description
Technical Field
The invention belongs to the technical field of All-Optical Wavelength Conversion (AOWC), and particularly relates to a polarization multiplexing signal Wavelength Conversion device and method based on Optical fiber ring crosstalk elimination.
Background
With the rapid development of services such as cloud computing, network television, multipoint video conference and the like and the rapid development of the internet of things, the service capacity of a communication network is increased explosively, which all provides new challenges for an optical transmission network. The application of Wavelength Division Multiplexing (WDM) technology greatly increases the transmission capacity of optical communication networks, however, there is a limitation of "electronic bottleneck" in implementing conversion by using a conventional optical/electrical/optical (O/E/O) processing method at a network connection node, and the power consumption is large. An all-optical wavelength conversion technology (AOWC) is introduced at an optical network node, information does not need to be converted from an optical domain to an electric domain like in a traditional communication network, the electronic bottleneck of an optical/electric/optical system during signal transmission and exchange is broken, power consumption is saved, and dynamic network reconfiguration and flexible and efficient wavelength routing can be realized.
There are several implementations of all-optical wavelength conversion, including using the Differential Frequency Generation (DFG) effect in electro-optic crystals, using the cross-phase modulation (XPM) effect, cross-gain modulation (XGM) effect in Semiconductor Optical Amplifiers (SOAs), using the nonlinear optical ring mirror (NOLM) switching effect, and using the four-wave mixing (FWM) effect in SOAs or highly nonlinear optical fibers (HNLF). In these wavelength conversion modes, the FWM effect in nonlinear devices such as SOA and HNLF is used to perform all-optical wavelength conversion, and the wavelength conversion method has the advantages of good transparency to data modulation formats, simple structure and the like, and is receiving attention. Compared with the wavelength conversion adopting the SOA, the wavelength conversion based on the FWM effect in the HNLF is not limited by the service life of a carrier, and the wavelength conversion method has the advantages of wide conversion range, suitability for high-speed data transmission and the like.
On the other hand, capacity expansion by increasing the single-wavelength communication rate is an effective technical means. The Polarization Multiplexing (PM) technology utilizes two orthogonal polarization states to carry respective information for transmission, and increases system capacity and spectrum utilization rate while not greatly changing the original network structure.
Therefore, in order to adapt to the development of high-speed large-capacity optical fiber communication systems and networks, it is very meaningful to realize high-quality all-optical wavelength conversion of polarization-multiplexed signals at nodes of an optical network. At present, there is an article reported that [ Jia Lu, Polarization sensitive wavelength conversion based on four-wave conversion for Polarization multiplexing signal in high-nonlinear fibers, 2009, 282(7): 1274-1280 ], and experiments verify that the power cost after conversion of 2.5Gb/s and 10Gb/s Polarization multiplexing signals is 0.8dB and 2dB when the pump light spacing is 0.42 nm. This is because in the process of performing all-optical wavelength conversion on the polarization multiplexed signal, crosstalk occurs between multiplexed channels due to the Nonlinear Polarization Rotation (NPR) effect, which becomes intensity noise after photoelectric detection at the receiving end, and affects the quality of the converted optical signal. [ Mathieu Chagnon, Digital signal processing for dual-polarization interference and interference phase modulation for using stocks detection, IEEE Journal of Lightwave Technology, 2016, 34(1): 188-. However, the stokes vector direct detector is composed of two directional couplers, a Polarization Beam Splitter (PBS) and a 90 th optical mixer, four photodetectors, four analog-to-digital converters (ADCs) and a DSP unit, and the receiver structure is complex and the system cost is high.
Disclosure of Invention
In order to solve the problems, the invention provides a polarization multiplexing signal wavelength conversion device and method based on optical fiber ring crosstalk elimination. The fiber ring consists of a Polarization Beam Splitter (PBS), a high nonlinear fiber (HNLF) and a Polarization Controller (PC). PBS decomposes the coupled pump light and polarization multiplexing signal into two polarization mode signals in x direction and y direction, the polarization mode signal in x direction enters HNLF clockwise, the polarization mode signal in y direction enters HNLF counterclockwise, and four-wave mixing is performed in HNLF independently in x polarization direction and y polarization direction. According to the scheme, a signal compensation digital signal processing unit is not needed, the system cost is reduced, and the practicability is high.
In order to achieve the purpose, the invention adopts the following technical scheme:
a polarization multiplexing signal wavelength conversion device and method based on optical fiber ring crosstalk elimination are disclosed, the device comprises: three single-mode lasers, three polarization controllers, three polarization beam splitters, two baseband data signal generators, two Mach-Zehnder modulators, a polarization beam combiner, two optical couplers, a high nonlinear optical fiber, a tunable optical filter, two photodetectors and two receivers, and is characterized in that:
the first single-mode laser is used for generating continuous signal light;
the second single-mode laser and the third single-mode laser are used for generating two continuous pumping lights;
the first polarization controller is used for adjusting the polarization state of the signal light to form an included angle of 45 degrees with the main shaft of the first polarization beam splitter;
the first polarization beam splitter is used for splitting the signal light into two polarization modes in the x direction and the y direction;
the two baseband data signal generators are used for generating two paths of baseband data signals;
the two Mach-Zehnder modulators are used for respectively modulating the two paths of baseband data signals onto two polarization modes of the signal light;
the first polarization beam combiner is used for coupling two polarization modes carrying baseband data signals to form polarization multiplexing signal light;
the first optical coupler is used for coupling the two pumping lights together;
the second optical coupler is used for coupling the polarization multiplexing signal light output by the first polarization beam combiner and the pump light output by the first coupler together;
the second polarization controller is used for adjusting the included angle of 45 degrees between the coupled polarization multiplexing signal light and the pump light and the main shaft of the second polarization beam splitter;
the second polarization beam splitter is used for splitting the coupled polarization multiplexing signal light and the pump light into polarization mode signals in the x direction and the y direction, wherein the polarization mode signal in the x direction enters HNLF along the clockwise direction, and the polarization mode signal in the y direction enters HNLF along the counterclockwise direction;
the third polarization controller is used for adjusting the polarization states of two paths of signals in the clockwise direction and the anticlockwise direction in the optical fiber loop, so that two polarization modes output by the second polarization beam splitter are perpendicular to each other;
the high nonlinear optical fiber is used for carrying out four-wave frequency mixing on two paths of signals in the clockwise direction and the anticlockwise direction in the x polarization direction and the y polarization direction respectively, and generating conversion light carrying baseband data signals in the two polarization directions;
the tunable optical filter is used for filtering the converted light carrying the baseband data signal output by the second polarization beam splitter;
the third polarization beam splitter is used for decomposing the converted optical signal filtered by the tunable filter into two mutually perpendicular polarization modes;
the two photodetectors are used for converting the two polarization mode signals of the converted optical signal into electric signals;
and the two receivers are used for receiving the electric signals output by the two photodetectors.
Corresponding to the device, the invention also provides a polarization multiplexing signal wavelength conversion device and a method based on optical fiber ring crosstalk elimination, which are characterized by comprising the following steps:
the method comprises the following steps: generating a continuous signal light by using the first single-mode laser, adjusting a polarization state of the signal light to form an included angle of 45 degrees with a main shaft of the first polarization beam splitter by using the first polarization controller, decomposing the output of the first polarization beam splitter into two polarization modes in an x direction and a y direction, modulating two paths of baseband data signals generated by the baseband data signal generator onto the two polarization modes of the signal light by using the two Mach-Zehnder modulators, and coupling the two polarization modes carrying the baseband data signals by using the polarization beam combiner to form polarization multiplexing signal light;
step two: generating two continuous pumping lights by using the second single-mode laser and the third single-mode laser, and coupling the two pumping lights together by using the first optical coupler;
step three: the second optical coupler is utilized to couple the polarization multiplexing signal light output by the polarization beam combiner and the pump light output by the first coupler together, and the second polarization controller is adopted to adjust the included angle of 45 degrees between the coupled polarization multiplexing signal light and the pump light and the main shaft of the second polarization beam splitter;
step four: the second polarization beam splitter is used for splitting the coupled polarization multiplexing signal light and the pump light into polarization mode signals in the x direction and the y direction, the polarization mode signals in the x direction enter HNLF along the clockwise direction, the polarization mode signals in the y direction enter HNLF along the counterclockwise direction, the third polarization controller is used for adjusting the polarization states of the two signals in the clockwise direction and the counterclockwise direction in the optical fiber loop, so that the two polarization modes output by the second polarization beam splitter are perpendicular to each other, the high nonlinear optical fiber is used for performing four-wave frequency mixing on the two signals in the clockwise direction and the counterclockwise direction in the optical fiber loop respectively in the x polarization direction and the y polarization direction, and conversion light carrying baseband data signals is generated in the two polarization directions;
step five: the tunable optical filter is used for filtering the converted light carrying the baseband data signal output by the second polarization beam splitter, the third polarization beam splitter is used for decomposing the converted optical signal filtered by the tunable optical filter into two mutually perpendicular polarization modes, the two polarization modes enter the two photoelectric detectors respectively, the two polarization mode signals of the converted optical signal are converted into electric signals, and finally the two receivers are used for receiving the electric signals output by the two photoelectric detectors in two polarization directions respectively.
The invention is based on the wavelength conversion structure of the optical fiber ring, utilize a PBS to decompose polarization multiplexing signal light and pumping light into x direction and y direction polarization mode signal, the polarization mode signal of x direction enters the high non-linear optic fibre along clockwise, the polarization mode signal of y direction enters the high non-linear optic fibre along the counter-clockwise, carry on the four-wave mixing in x polarization direction and y polarization direction independently separately in HNLF, can dispel the cross talk among the signal channels caused by the rotation effect of non-linear polarization in the wavelength conversion of polarization multiplexing signal, and does not need the processing unit of signal compensation digital signal, simple in construction, with low costs, improve the performance of the wavelength conversion system integrally.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
in the figure:
1-single mode laser (DFB)
2-single mode laser (DFB)
3-single mode laser (DFB)
4-Polarization Controller (PC)
5-Polarization Beam Splitter (PBS)
6-baseband data signal generator
7-baseband data signal generator
8-Mach-Zehnder modulator (MZM)
9-Mach-Zehnder modulator (MZM)
10-Polarization Beam Combiner (PBC)
11-Optical Coupler (OC)
12-Optical Coupler (OC)
13-Polarization Controller (PC)
14-Polarization Beam Splitter (PBS)
15-Polarization Controller (PC)
16-optical nonlinear fiber (HNLF)
17-tunable optical filter
18-Polarization Beam Splitter (PBS)
19-photoelectric detector
20-photoelectric detector
21-receiver
22-receiver
Fig. 2 is the result of the HNLF-based polarization multiplexed signal wavelength conversion scheme. Wherein, fig. 2(a) is a spectrum diagram after wavelength conversion in the HNLF-based polarization multiplexing signal wavelength conversion scheme; fig. 2(b) and 2(c) are eye diagrams of converting the x-polarization direction and the y-polarization direction of an optical signal in the HNLF-based polarization multiplexed signal wavelength conversion scheme, respectively.
FIG. 3 is a graph of results of an embodiment of the present invention; wherein, fig. 3(a) is a spectrum diagram after wavelength conversion in the polarization multiplexing signal wavelength conversion scheme based on the optical fiber ring; fig. 3(b) and 3(c) are eye diagrams for converting the x-polarization direction and the y-polarization direction of an optical signal in a polarization multiplexed signal wavelength conversion scheme based on a fiber ring.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, in the present embodiment, the apparatus includes:
a single mode laser 1 for generating continuous signal light;
a single mode laser 2 for generating continuous pump light;
a single mode laser 3 for generating continuous pump light;
the polarization controller 4 is used for adjusting the polarization state of the signal light to form an included angle of 45 degrees with the main shaft of the polarization beam splitter 5;
a polarization beam splitter 5 for splitting the signal light into two polarization modes in the x direction and the y direction;
a baseband data signal generator 6; for generating a baseband data signal;
a baseband data signal generator 7; for generating a baseband data signal;
mach- zehnder modulators 8 and 9 for modulating the two paths of baseband data signals 6 and 7 to two polarization modes of the signal light respectively;
a polarization beam combiner 10, configured to couple two polarization modes carrying baseband data signals to form polarization multiplexing signal light;
an optical coupler 11 for coupling together the two pump lights;
an optical coupler 12, configured to couple the polarization multiplexing signal light output by the polarization beam combiner 10 and the pump light output by the optical coupler 11 together;
the polarization controller 13 is configured to adjust an included angle of 45 degrees between the polarization multiplexing signal light output by the optical coupler 12 and the main axis of the polarization beam splitter 14;
the polarization beam splitter 14 is configured to split the coupled polarization multiplexing signal light and the pump light into x-direction and y-direction polarization mode signals, where the x-direction polarization mode signal enters the high nonlinear optical fiber 16 clockwise, and the y-direction polarization mode signal enters the high nonlinear optical fiber 16 counterclockwise;
the polarization controller 15 is configured to adjust polarization states of two signals in the optical fiber loop in the clockwise direction and the counterclockwise direction, so that two polarization modes output by the polarization beam splitter 14 are perpendicular to each other;
the high nonlinear optical fiber 16 is used for performing four-wave frequency mixing on two paths of signals in the clockwise direction and the anticlockwise direction in the x polarization direction and the y polarization direction respectively in an optical fiber loop, and generating conversion light carrying baseband data signals in the two polarization directions;
a tunable optical filter 17 for filtering the converted light carrying the baseband data signal output by the polarization beam splitter 14;
a polarization beam splitter 18 for splitting the converted optical signal filtered by the tunable filter 17 into two polarization modes perpendicular to each other;
a photodetector 19 for converting the optical signal of the x-polarization direction into an electrical signal;
a photodetector 20 for converting the optical signal of the y polarization direction into an electrical signal;
a receiver 21 for receiving the electrical signal in the x polarization direction;
a receiver 22 for receiving the electrical signal with the y polarization direction;
the working process adopted by the invention is as follows:
the method comprises the following steps: the single-mode laser 1 is adopted to generate continuous signal light with the frequency of 193.05THZ and the power of 12dbm, the polarization controller 4 is adopted to adjust the polarization state of the signal light to form a 45-degree included angle with the main shaft of the polarization beam splitter 5, the output of the polarization beam splitter 5 is divided into two polarization modes in the x direction and the y direction, two Mach- Zehnder modulators 8 and 9 are adopted to respectively modulate two paths of NRZ signals 6 and 7 with the single polarization rate of 2.5Gbit/s onto the two polarization modes of the signal light, and the polarization beam combiner 10 is adopted to couple the two polarization modes carrying the NRZ signals to form polarization multiplexing signal light;
step two: the single-mode laser 2 is used for generating continuous pumping light with the frequency of 193.2THZ and the power of 20dBm, the single-mode laser 3 is used for generating continuous pumping light with the frequency of 193.24THZ and the power of 20dBm, and the optical coupler 11 is used for coupling the two pumping lights together;
step three: the polarization multiplexing signal light output by the polarization beam combiner 10 and the pump light output by the optical coupler 11 are coupled together by using the optical coupler 12, and the polarization controller 13 is adopted to adjust the included angle of 45 degrees between the coupled polarization multiplexing signal light and the pump light and the main shaft of the polarization beam splitter 14;
step four: the polarization multiplexing signal light and the pump light after coupling are decomposed into polarization mode signals in the x direction and the y direction by the polarization beam splitter 14, the polarization mode signals in the x direction enter the high nonlinear optical fiber 16 along the clockwise direction, the polarization mode signals in the y direction enter the high nonlinear optical fiber 16 along the counterclockwise direction, the polarization controller 15 is used for adjusting the polarization states of two paths of signals in the clockwise direction and the counterclockwise direction in the optical fiber loop, so that the two polarization modes output by the polarization beam splitter 14 are perpendicular to each other, four-wave frequency mixing is respectively carried out on the two paths of signals in the clockwise direction and the counterclockwise direction in the optical fiber loop in the x polarization direction and the y polarization direction by adopting the high nonlinear optical fiber 16, and conversion light carrying NRZ signals is generated in the two polarization directions;
step five: the tunable optical filter 17 is used to filter the converted light with frequency of 193.01THZ carrying NRZ signal output by the polarization beam splitter 14, and the polarization beam splitter 18 is used to decompose the converted optical signal filtered by the tunable optical filter 17 into two polarization modes perpendicular to each other, which enter the two photodetectors 19 and 20, respectively, convert the two polarization mode signals of the converted optical signal into electrical signals, and finally, the two receivers 21 and 22 are used to receive the electrical signals output by the two photodetectors 19 and 20 in two polarization directions, respectively.
Fig. 2 is the result of the HNLF-based polarization multiplexed signal wavelength conversion scheme. Wherein, fig. 2(a) is a spectrum diagram after wavelength conversion in the HNLF-based polarization multiplexing signal wavelength conversion scheme; fig. 2(b) and 2(c) are eye diagrams of converting the x-polarization direction and the y-polarization direction of an optical signal in the HNLF-based polarization multiplexed signal wavelength conversion scheme, respectively. Fig. 3 shows the results of this example applied to fig. 1. Wherein, fig. 3(a) is a spectrum diagram after wavelength conversion in the polarization multiplexing signal wavelength conversion scheme based on the optical fiber ring; fig. 3(b) and 3(c) are eye diagrams for converting the x-polarization direction and the y-polarization direction of an optical signal in a polarization multiplexed signal wavelength conversion scheme based on a fiber ring.
Comparing fig. 3(b-c) with fig. 2(b-c), it can be seen that the eye opening of the converted optical signal in the polarization multiplexing signal wavelength conversion scheme based on the optical fiber ring is larger and clearer, which illustrates that the crosstalk between multiplexing channels due to the nonlinear polarization rotation effect during the wavelength conversion process is eliminated.
Main technical advantages
The invention is based on the wavelength conversion structure of the optical fiber ring, uses a PBS to decompose polarization multiplexing signal light and pumping light into polarization mode signals in the x direction and the y direction, the polarization mode signal in the x direction enters the high nonlinear optical fiber along the clockwise direction, the polarization mode signal in the y direction enters the high nonlinear optical fiber along the counterclockwise direction, and four-wave mixing is respectively and independently carried out in the x polarization direction and the y polarization direction in HNLF (high frequency fiber), so that the channel crosstalk caused by the nonlinear polarization rotation effect of the polarization multiplexing signal in the wavelength conversion process can be eliminated, and the system performance is improved. The device does not need a signal compensation digital signal processing unit and has the advantages of simple structure, low cost and strong practicability.
Claims (4)
1. A polarization multiplexing signal wavelength conversion device based on optical fiber ring crosstalk elimination comprises the following components: three single-mode lasers, three polarization controllers, three polarization beam splitters, two baseband data signal generators, two Mach-Zehnder modulators, a polarization beam combiner, two optical couplers, a high nonlinear optical fiber, a tunable optical filter, two photodetectors and two receivers, and is characterized in that:
the first single-mode laser is used for generating continuous signal light;
the second single-mode laser and the third single-mode laser are used for generating two continuous pumping lights;
the first polarization controller is used for adjusting the polarization state of the signal light to form an included angle of 45 degrees with the main shaft of the first polarization beam splitter;
the first polarization beam splitter is used for splitting the signal light into two polarization modes in the x direction and the y direction;
the two baseband data signal generators are used for generating two paths of baseband data signals;
the two Mach-Zehnder modulators are used for respectively modulating the two paths of baseband data signals onto two polarization modes of the signal light;
the first polarization beam combiner is used for coupling two polarization modes carrying baseband data signals to form polarization multiplexing signal light;
the first optical coupler is used for coupling the two pumping lights together;
the second optical coupler is used for coupling the polarization multiplexing signal light output by the first polarization beam combiner and the pump light output by the first coupler together;
the second polarization controller is used for adjusting the included angle of 45 degrees between the coupled polarization multiplexing signal light and the pump light and the main shaft of the second polarization beam splitter;
the second polarization beam splitter is used for splitting the coupled polarization multiplexing signal light and the pump light into polarization mode signals in the x direction and the y direction, the polarization mode signals in the x direction enter the high-nonlinearity optical fiber clockwise, and the polarization mode signals in the y direction enter the high-nonlinearity optical fiber anticlockwise;
the third polarization controller is used for adjusting the polarization states of two paths of signals in the clockwise direction and the anticlockwise direction in the optical fiber loop, so that two polarization modes output by the second polarization beam splitter are perpendicular to each other;
the high nonlinear optical fiber is used for carrying out four-wave frequency mixing on two paths of signals in the clockwise direction and the anticlockwise direction in the x polarization direction and the y polarization direction respectively, and generating conversion light carrying baseband data signals in the two polarization directions;
the tunable optical filter is configured to filter converted light carrying a baseband data signal output by the second polarization beam splitter;
the third polarization beam splitter is used for decomposing the converted optical signal filtered by the tunable filter into two mutually perpendicular polarization modes;
the two photodetectors are used for converting the two polarization mode signals of the converted optical signal into electric signals;
and the two receivers are used for receiving the electric signals output by the two photodetectors.
2. The polarization multiplexing signal wavelength conversion device based on optical fiber ring crosstalk elimination according to claim 1, characterized in that a polarization beam splitter is adopted to decompose the coupled pump light and polarization multiplexing signal into two polarization mode signals in x direction and y direction, the polarization mode signal in x direction enters the high non-linear optical fiber clockwise, the polarization mode signal in y direction enters the high non-linear optical fiber counterclockwise, four-wave mixing is performed in the high non-linear optical fiber in x polarization direction and y polarization direction independently, and channel crosstalk caused by non-linear polarization rotation effect of the polarization multiplexing signal in the wavelength conversion process can be reduced.
3. The polarization multiplexing signal wavelength conversion device based on optical fiber ring crosstalk elimination according to claim 1, wherein a polarization controller is adopted to adjust polarization states of two signals in a clockwise direction and a counterclockwise direction in an optical fiber loop, so that two polarization modes output by a polarization beam splitter in the loop are perpendicular to each other.
4. The polarization multiplexing signal wavelength conversion method based on optical fiber ring crosstalk elimination is characterized by comprising the following steps of:
the method comprises the following steps: generating a continuous signal light by using the first single-mode laser, adjusting a polarization state of the signal light to form an included angle of 45 degrees with a main shaft of the first polarization beam splitter by using the first polarization controller, decomposing the output of the first polarization beam splitter into two polarization modes in an x direction and a y direction, modulating two paths of baseband data signals generated by the baseband data signal generator onto the two polarization modes of the signal light by using the two Mach-Zehnder modulators, and coupling the two polarization modes carrying the baseband data signals by using the polarization beam combiner to form polarization multiplexing signal light;
step two: generating two continuous pumping lights by using the second single-mode laser and the third single-mode laser, and coupling the two pumping lights together by using the first optical coupler;
step three: the second optical coupler is utilized to couple the polarization multiplexing signal light output by the polarization beam combiner and the pump light output by the first coupler together, and the second polarization controller is adopted to adjust the included angle of 45 degrees between the coupled polarization multiplexing signal light and the pump light and the main shaft of the second polarization beam splitter;
step four: the second polarization beam splitter is used for splitting the coupled polarization multiplexing signal light and the pump light into polarization mode signals in the x direction and the y direction, the polarization mode signals in the x direction enter the high-nonlinearity optical fiber clockwise, the polarization mode signals in the y direction enter the high-nonlinearity optical fiber anticlockwise, the third polarization controller is used for adjusting the polarization states of the two paths of signals in the clockwise direction and the anticlockwise direction in the optical fiber loop, so that the two polarization modes output by the second polarization beam splitter are perpendicular to each other, the high-nonlinearity optical fiber is used for carrying out four-wave frequency mixing on the two paths of signals in the clockwise direction and the anticlockwise direction in the optical fiber loop respectively in the x polarization direction and the y polarization direction, and conversion light carrying baseband data signals is generated in the two polarization directions;
step five: the tunable optical filter is used for filtering the converted light carrying the baseband data signal output by the second polarization beam splitter, the third polarization beam splitter is used for decomposing the converted optical signal filtered by the tunable optical filter into two mutually perpendicular polarization modes, the two polarization modes enter the two photoelectric detectors respectively, the two polarization mode signals of the converted optical signal are converted into electric signals, and finally the two receivers are used for receiving the electric signals output by the two photoelectric detectors in two polarization directions respectively.
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