CN101645739B - Polarization demultiplexing device, polarization multiplexing light communication system and implementation method - Google Patents
Polarization demultiplexing device, polarization multiplexing light communication system and implementation method Download PDFInfo
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Abstract
The invention discloses a polarization demultiplexing device, comprising a first wave plate device, a second wave plate device and a polarization partial wave device; the first wave plate device is used for changing a polarization multiplexing signal with arbitrary input polarization state into a linear polarization multiplexing signal; the second wave plate device is used for changing the linear polarization multiplexing signal to lead the linear polarization multiplexing signal to be aligned to a main shaft of the following polarization partial wave device; the polarization partial wave device is used for separating the polarization multiplexing signal into a first polarization signal output and a second polarization signal output. The invention also provides a polarization multiplexing light communication system and an implementation method by adopting the polarization demultiplexing device; the invention simplifies the structure of the polarization demultiplexing device, reduces the complexity of polarization control correspondingly and improves the response efficiency of the polarization demultiplexing device; meanwhile, the second wave plate device is adopted to adjust the angle of polarization communication channel and main shafts of two polarization polarizers, and polarization communication channel crosstalk caused by the damage of polarization communication channel orthogonality caused by PDL is eliminated.
Description
Technical field
The present invention relates to the optical communication system field, particularly relate to polarization demultiplexing device, palarization multiplexing optical communication system and implementation method.
Background technology
In the present invention, technical term implication used is as follows:
WDM, Wavelength Division Multiplexing, wavelength division multiplexing;
PDM, Polarization Division Multiplexing, palarization multiplexing;
PC, Polarization Controller, Polarization Controller;
PDD, Polarization Demultiplexing Device, polarization demultiplexing device;
PBC, Polarization Beam Combiner, polarization beam combiner;
PBS, Polarization Beam Separator, polarization beam apparatus;
QWP, Quarter Wave Plane, quarter wave plate;
HWP, Half Wave Plane, half-wave plate;
PMD, Polarization Mode Dispersion, polarization mode dispersion;
PDG, polarization Mode Gain, Polarization-Dependent Gain;
PDL, Polarization Dependent Loss, Polarization Dependent Loss;
ASK, Amplitude Shift Keying, amplitude shift keying;
In order to improve the efficient of wdm system, people have used two kinds of transmission technologys that polarization is relevant: palarization multiplexing (PDM) technology and polarization interleaving technique, palarization multiplexing is to utilize the mutually orthogonal light wave of two polarization states of Same Wavelength to carry respectively data, utilizes this technology that the transmission capacity of optical communication system is doubled.The polarization interleaving technique is to make the polarization state of adjacent wavelength signals mutually orthogonal, utilizes this technology can suppress crosstalking of interchannel.
Optical communication system based on polarization multiplexing generally includes two functional modules, and the one, the palarization multiplexing module of transmitting terminal is generally realized by polarization beam combiner (PBC); The one, the polarization demultiplexing module of receiving terminal, minute electric territory and light two kinds, territory solution.The advantage of electricity territory solution is to carry out the compensation of polarization-dependent effects by the high-speed digital signal processing unit, and the advantage of light territory solution is irrelevant with data rate, need not increase the high-speed digital signal processing unit, thereby cost is lower, uses more.As shown in Figure 1, the polarization demultiplexing scheme in light territory mainly is made of Polarization Controller (PC) and polarization beam apparatus (PBS) at present.The basic structure of Polarization Controller is passed through the polarisation-multiplexed signal of Optical Fiber Transmission as shown in Figure 2, and its polarization state is change at random, and the effect of first quarter wave plate (QWP) is to make polarisation-multiplexed signal become the linearly polarized light signal; The effect of half-wave plate (HWP) is the polarization direction that changes the linearly polarized light signal; The effect of second quarter wave plate is to control output signal to become desired polarization state.The output of Polarization Controller is sent into polarization beam apparatus through general single mode fiber, by polarization beam apparatus with two palarization multiplexing channel separation after, processed by receiver RX1, RX2 respectively.By the performance of monitor signal, feedback control circuit is controlled Polarization Controller, and the polarization state of the output signal of Polarization Controller is met the demands.In Fig. 1, monitor signal can be taken from receiver, perhaps only takes from the output port of PBS.But, because the Polarization Controller purposes is a lot, can be used for polarization mode dispersion (PMD) compensation, polarization demultiplexing etc., even can be used as scrambler, therefore, when Polarization Controller was used for polarization demultiplexing, it is comparatively complicated that its structure seems.Specifically, because the input signal of the polarization beam apparatus of polarization demultiplexing device back only requires it is the linearly polarized light signal, therefore, just can satisfy by first quarter wave plate and half-wave plate, so second quarter wave plate in this structure is to save, like this can also be corresponding the complexity controlled of reduction, thereby improve response efficiency.
Moreover, the implicit prerequisite of utilizing scheme shown in Figure 1 to carry out polarization demultiplexing is: transmitting terminal enters the polarisation-multiplexed signal (being comprised of two mutually orthogonal light signals of polarization state) of optical fiber, through after the transmission of optical fiber, two polarised lights that enter in the polarisation-multiplexed signal of PC are still quadratures.Such light signal could be separated into two-way without the polarization signal of crosstalking by PBS after adjusting polarization state through PC, for the receiver reception of back.Due to the polarization effect of optical fiber in system and device (as erbium-doped fiber amplifier), two polarised lights of input optical fibre orthogonality when output can be subjected to destruction to a certain extent, crosstalks thereby form polarization channels but in fact.Therefore, utilize this scheme to carry out polarization demultiplexing, systematicness may reduce because polarization channels is crosstalked.
To sum up, because PC does not aim at polarization demultiplexing design, cause the complex structure of PC, control difficulty high, affected response efficiency, thereby and crosstalk because polarised light orthogonality when the output is subjected to a certain extent destruction to form polarization channels.
Summary of the invention
Technical problem to be solved by this invention is that in solution palarization multiplexing optical communication system, the control difficulty is high, response efficiency is low, the problem that polarization channels is crosstalked easily occurs.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is to provide a kind of polarization demultiplexing device, comprise first wave sheet devices, first wave sheet devices and polarization wave splitter device in the light path that is successively set on this device, the first wave sheet devices be used for input polarization arbitrarily polarisation-multiplexed signal become the linear polarization multiplexed signals; The first wave sheet devices be used for to change the polarization state through the linear polarization multiplexed signals of first wave sheet devices output, makes the spindle alignment of the polarization wave splitter device of itself and back; The polarization wave splitter device is used for being separated into through the polarisation-multiplexed signal of Second Wave sheet devices output first polarization signal output and second polarization signal output.
In above-mentioned polarization demultiplexing device, described first wave is on chip is set to a quarter wave plate, and described Second Wave is on chip is set to a half-wave plate, and described polarization wave splitter device is a polarization beam apparatus.
also comprise and be arranged on first, one-to-two optical splitter between the Second Wave sheet devices, described first wave is on chip be set to a quarter wave plate and input polarization arbitrarily polarisation-multiplexed signal become the input that exports optical splitter after the linear polarization multiplexed signals to through this quarter wave plate, described Second Wave sheet devices is by first, the second two half-wave plates form and through first of optical splitter output, the second two-route wire palarization multiplexing letter exports respectively described first to, the second two half-wave plates, described polarization wave splitter device is by first, the second polarization polarizer composition and the first via polarisation-multiplexed signal of exporting through the first half-wave plate export the described first polarization polarizer to, the the second road polarisation-multiplexed signal of the second half-wave plate output exports the described second polarization polarizer to.
A folk prescription of second polarization channels signal in the first via polarisation-multiplexed signal of first half-wave plate output and first polarization polarizer of its back is to quadrature; A folk prescription of first polarization channels signal in the second road polarisation-multiplexed signal of second half-wave plate output and the second polarization polarizer of its back is to quadrature.
The present invention also provides a kind of palarization multiplexing optical communication system, comprise transmitting terminal and receiving terminal, transmitting terminal is provided with phase shift keying device and a polarization beam combiner, polarization beam combiner closes ripple for the polarization signal with first, second two quadratures and becomes polarisation-multiplexed signal output, and the phase shift keying device is used for the first or second polarization signal is added pilot signal.Receiving terminal is provided with an aforesaid polarization demultiplexing device, is used for polarisation-multiplexed signal is separated into two first, second polarization signal outputs; Receiving terminal also comprises a feedback control function module, and this feedback control function module receives the output signal of palarization multiplexing optical communication system output and controls the polarization state of first, second wave plate device adjustment polarisation-multiplexed signal in the polarization demultiplexing device according to this output signal.
The present invention also provides a kind of palarization multiplexing optical communication system implementation method, comprises the steps:
A10, at the transmitting terminal of this system, the modulation of polarization direction of first, second polarization signal is become two mutually orthogonal bundle polarization signals;
A20, add pilot signal on the first or second polarization signal;
A30, with added polarization signal and the multiplexing polarisation-multiplexed signal that becomes of another polarization signal of pilot signal together, be sent to receiving terminal through fibre circuit;
A40, at the receiving terminal of this system, with quarter wave plate with input polarization arbitrarily polarisation-multiplexed signal become the linear polarization multiplexed signals;
A50, the linear polarization multiplexed signals is divided into two-way and first via signal changes the polarization direction of this signal by the first half-wave plate, make second polarization channels signal of first via signal and its back first polarization polarizer play folk prescription to quadrature, thereby by first polarization polarizer output the first polarization channels signal; The the second road signal changes the polarization direction of this signal by the second half-wave plate, make the first polarization channels signal in the second road signal and its back the second polarization polarizer play folk prescription to quadrature, thereby by second polarization polarizer output the second polarization channels signal.
In above-mentioned palarization multiplexing optical communication system implementation method, the output signal of this system's output that quarter wave plate and first, second half-wave plate receive according to the feedback control function module is adjusted the polarization state of polarisation-multiplexed signal.
The present invention, simplified the structure of polarization demultiplexing device, correspondingly reduced the complexity of carrying out Polarization Control, improved the response efficiency of polarization demultiplexing device, simultaneously, adjust the angle of the main shaft of polarization channels signals and first, second polarization polarizer by first, second two half-wave plates, eliminated polarization channels orthogonality that PDL etc. causes destroyed and crosstalk between the polarization channels that causes.
Description of drawings
The light territory solution schematic diagram of the existing polarization demultiplexing device of Fig. 1;
The existing Polarization Controller basic structure of Fig. 2 schematic diagram;
Polarization demultiplexing device embodiment one schematic diagram in Fig. 3 the present invention;
Polarization demultiplexing device embodiment two schematic diagrames in Fig. 4 the present invention;
Fig. 5 the present invention eliminates the schematic diagram of polarization interference;
Palarization multiplexing optical communication system schematic diagram in Fig. 6 the present invention.
Embodiment
Palarization multiplexing optical communication system control difficulty is high, response efficiency is low, the problem that polarization channels is crosstalked easily occurs in order to solve, the invention provides a kind of polarization demultiplexing device that is used in this system receiving terminal, comprise in the light path that is successively set on this device:
The first wave sheet devices, be used for input polarization arbitrarily polarisation-multiplexed signal become the linear polarization multiplexed signals;
The Second Wave sheet devices be used for to change the polarization state through the linear polarization multiplexed signals of first wave sheet devices output, makes the spindle alignment of the polarization wave splitter device of itself and back;
The polarization wave splitter device is used for being separated into through the polarisation-multiplexed signal of Second Wave sheet devices output first polarization signal output and second polarization signal output of quadrature.
Above-mentioned polarization demultiplexing device has following two kinds of specific embodiments, and Fig. 3 is the schematic diagram of embodiment one, as shown in Figure 3, in the present embodiment, first wave is on chip is set to a quarter wave plate, and Second Wave is on chip is set to a half-wave plate, and the polarization wave splitter device is a polarization beam apparatus.the polarisation-multiplexed signal Input that this polarization demultiplexing device receives comprises first, the signal of the second two polarization channels, quarter wave plate in order to will the input polarization state arbitrarily polarisation-multiplexed signal become the linear polarization multiplexed signals, half-wave plate is in order to change the polarization state of this linear polarization multiplexed signals, to make through the polarization state rotation of the linear polarization multiplexed signals of quarter wave plate output the spindle alignment with the polarization beam apparatus of back, polarisation-multiplexed signal after polarization beam apparatus will be processed through half-wave plate is separated into the first polarization channels signal OutputA with first polarization state, and with second polarization channels signal OutputB of the first polarization state quadrature.To realize polarization demultiplexing equally, the present embodiment is compared with existing Polarization Controller, has omitted second quarter wave plate, has therefore simplified the structure of polarization demultiplexing device, correspondingly reduce the complexity of carrying out Polarization Control, improved the response efficiency of polarization demultiplexing device.
Although embodiment one has realized polarization demultiplexing by a kind of very simple structure, but in actual applications, polarization effect due to optical fiber in system and device (as erbium-doped fiber amplifier), two polarised lights of input optical fibre orthogonality when output can be subjected to destruction to a certain extent, crosstalk thereby form polarization channels, affect the use of fibre system.for this reason, the invention provides the second polarization demultiplexing device embodiment, as shown in Figure 4, this polarization demultiplexing device comprises a quarter wave plate QWP, the first half-wave plate HWPA, the second half-wave plate HWPB, the first polarizer PolarizerA, the second polarizer PolarizerB and be arranged on quarter wave plate and first, one-to-two optical splitter between the second half-wave plate, quarter wave plate in order to input polarization arbitrarily polarisation-multiplexed signal become the linear polarization multiplexed signals, this linear polarization multiplexed signals can be crossed the one-to-two optical splitter and be divided into two-way, the first via enters the polarization direction that the first half-wave plate changes this signal, make second polarization channels signal in this road signal and back the first polarization polarizer play folk prescription to quadrature, thereby by first polarization polarizer output the first polarization channels signal, the the second road signal enters the polarization direction that the second half-wave plate changes its this signal, make the first polarization channels signal and back the second polarization polarizer play folk prescription to quadrature, thereby by second polarization channels signal of the second polarization polarizer output.
the operation principle of embodiment two is as follows: establishing the polarisation-multiplexed signal that receives is Input, this Input signal comprises first, the signal of the second two polarization channels, QWP with polarization state arbitrarily the Input signal become the linearly polarized light signal, the output of QWP is divided into two-way B1 and B2, can realize with the optical splitter of 1: 2, B1 enters HWPA, to change the polarization direction of signal, the output C1 of HWPA has following features: namely second polarization channels signal in C1 and PolarizerA's plays folk prescription to quadrature, therefore, PolarizerA only exports first polarization channels signal OutputA, B2 enters HWPB, and the output C2 of HWPB has following features: namely first polarization channels signal in C2 and PolarizerB play folk prescription to quadrature, so PolarizerB only exports second polarization channels signal OutputB.The control signal that work is controlled to PDD that in figure, empty arrow line provides for the outside.
The key of second embodiment is to adjust the angle of polarization channels signal and first, second polarization polarizer main shaft by HWPA and HWPB, and the polarization channels orthogonality that causes with elimination PDL etc. is destroyed and crosstalk between the polarization channels that causes.Below in conjunction with Fig. 5, it is carried out detailed explanation.
At the transmitting terminal of polarisation multiplex system, form polarisation-multiplexed signal through after palarization multiplexing, this signal forms (as shown in Fig. 5 a) by signal P, the S of two polarization state quadratures, respectively by the first polarization channels and the carrying of the second polarization channels.For simplified illustration and without loss of generality, can think that the diaxon of PDL effect of the optical fiber of polarisation-multiplexed signal process and various devices is respectively X and Y, wherein attenuation is arranged on X-axis and on Y-axis without attenuation, P and the S projection on diaxon is respectively Px, Py and Sx, Sy.
After polarisation-multiplexed signal was through transmission, under the impact of PDL effect, the P signal became P ', and the S signal becomes S ', and their projections on diaxon are respectively P ' x, P ' y and S ' x, S ' y (as shown in Fig. 5 b).Due to the attenuation on X-axis, so P ' x＜Px, S ' x＜Sx; P ' y=Py, S ' y=Sy are in like manner arranged.Be not difficult to find out, this causes there is no orthogonality between P ' and S '.Although Polarization Controller can be controlled polarization state, adjust the polarization direction, can't repair this destruction to orthogonality.And PBS can only accomplish without separating the signal of two-way cross-polarization with crosstalking, if input signal does not have orthogonality, it will inevitably produce polarization interference when separating, also just cause the part of signal of a channel because the each side reasons such as isolation of device appear on one other channel.Therefore, in the PDD shown in Fig. 3, the output signal of its PBS has been carried polarization interference.
And utilize PDD shown in Figure 4, can eliminate top crosstalking.In PDD shown in Figure 4, the polarisation-multiplexed signal of receiving becomes the linear polarization multiplexed signals after QWP, this linear polarization multiplexed signals is divided into two-way B1, B2 by optical splitter, and adjust the polarization direction of B1 by HWPA, make in the output C1 of HWPA, S ' plays folk prescription to quadrature (as shown in Fig. 5 c) with PolarizerA's.Obviously, the output OutputA of PolarizerA is P ' in the projection that plays folk prescription and make progress, S ' thereon be projected as 0, so do not have crosstalking of S '.Equally, as shown in Fig. 5 d, make in the output C2 of HWPB, P ' and PolarizerB play folk prescription to quadrature, like this output OutputB of PolarizerB be S ' in the projection that a folk prescription makes progress, do not have crosstalking of P '.
As can be known from the above analysis, the technical scheme of the embodiment of the present invention two has improved the performance of polarization demultiplexing, and polarization channels that cause is crosstalked because the polarisation-multiplexed signal orthogonality is destroyed in elimination.
In above-mentioned two kinds of polarization demultiplexing device schemes, the specific implementation technology of wave plate has multiple, includes but not limited to crystal wave-plate, fiber optic coils, optical fiber extruding etc., is controlled the work of these wave plates by control signal.
The present invention also provides a kind of polarization demultiplexing optical communication system, as shown in Figure 6, comprise transmitting terminal and receiving terminal, described transmitting terminal is provided with a polarization beam combiner PBC, this PBC closes ripple with the polarization signal of first, second two quadratures and becomes polarisation-multiplexed signal output, described receiving terminal is provided with a polarization demultiplexing device PDD and a feedback control function piece, and PDD is separated into polarisation-multiplexed signal first, second polarization signal output of two quadratures.Transmitting terminal in system, polarization direction through the first polarization signal after amplitude shift keying device (ASK) modulation and the second polarization signal is mutually orthogonal, both are together multiplexing by polarization beam combiner (PBC), become polarisation-multiplexed signal, are sent to receiving terminal.In order to carry out polarization demultiplexing, when transmitting terminal carries out palarization multiplexing, adopt suitable labeling method (as adding pilot tone on one road polarization signal therein, perhaps make the two-way polarization signal produce difference etc. on the features such as power) so that receiving terminal can identify the two-way polarization signal when carrying out polarization demultiplexing.In the present embodiment, the second polarization signal first carries out phase shift keying modulation (PM) with the pilot signal of 1MHz before entering PBC.PDD in native system comprises first wave sheet devices, Second Wave sheet devices and polarization wave splitter device, the first wave sheet devices with input polarization arbitrarily polarisation-multiplexed signal become the linear polarization multiplexed signals; The Second Wave sheet devices changes the polarization state through the linear polarization multiplexed signals of first wave sheet devices output, makes the spindle alignment of the polarization wave splitter device of itself and back; The polarization wave splitter device will be separated into through the polarisation-multiplexed signal of Second Wave sheet devices output first polarization signal output and second polarization signal output of quadrature.Polarisation-multiplexed signal through Optical Fiber Transmission after PDD, PDD adopts above-mentioned principle with polarization state input signal Input arbitrarily, demultiplex into the first polarization channels signal OutputA and the second polarization channels signal OutputB, the feedback control function piece is processed according to the signal that monitors, the output control signal goes to control the work of PDD, monitor signal can be taken from the light path of polarization demultiplexing device output, also can take from the electric territory through receiver RX1 and/or RX2 processing.At receiving terminal, light path after PDD is divided the light (such as the optical splitter that can use 5: 95) that takes a morsel, after phase demodulating and opto-electronic conversion, according to certain algorithm go to control PDD work (such as: make in PDD the pilot signal in PolarizerA output light for minimum, pilot signal in PolarizerB output light is maximum), the method for controlling PDD work adopts existing techniques in realizing.
The present invention also provides above-mentioned palarization multiplexing optical communication system implementation method, comprises the following steps:
A10, at the transmitting terminal of this system, the modulation of polarization direction of first, second polarization signal is become two mutually orthogonal bundle polarization signals;
A20, the pilot signal by phase-shift-keying method 1MHz on adding on the first or second polarization signal;
A30, with added polarization signal and the multiplexing polarisation-multiplexed signal that becomes of another polarization signal of pilot signal together, be sent to receiving terminal through fibre circuit;
A40, at the receiving terminal of this system, with quarter wave plate with input polarization arbitrarily polarisation-multiplexed signal become the linear polarization multiplexed signals;
A50, the linear polarization multiplexed signals is divided into two-way and first via signal changes the polarization direction of this signal by the first half-wave plate, make second polarization channels signal of first via signal and its back first polarization polarizer play folk prescription to quadrature, thereby by first polarization polarizer output the first polarization channels signal; The the second road signal changes the polarization direction of this signal by the second half-wave plate, make the first polarization channels signal in the second road signal and its back the second polarization polarizer play folk prescription to quadrature, thereby by second polarization polarizer output the second polarization channels signal.
In above-mentioned steps, the output signal of this system's output that quarter wave plate and first, second half-wave plate receive according to the feedback control function module is adjusted the polarization state of polarisation-multiplexed signal.
The present invention is not limited to above-mentioned preferred forms, for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, within these improvements and modifications also are considered as protection scope of the present invention.
Claims (6)
1. polarization demultiplexing device is characterized in that comprising in the light path that is successively set on this device:
The first wave sheet devices, be used for input polarization arbitrarily polarisation-multiplexed signal become the linear polarization multiplexed signals;
The Second Wave sheet devices be used for to change the polarization state through the linear polarization multiplexed signals of first wave sheet devices output, makes the spindle alignment of the polarization wave splitter device of itself and back;
The polarization wave splitter device is used for being separated into through the polarisation-multiplexed signal of Second Wave sheet devices output first polarization signal output and second polarization signal output;
also comprise and be arranged on first, one-to-two optical splitter between the Second Wave sheet devices, described first wave is on chip is set to a quarter wave plate, and input polarization polarisation-multiplexed signal arbitrarily becomes the input that exports optical splitter after the linear polarization multiplexed signals to through this quarter wave plate, described Second Wave sheet devices is by first, the second two half-wave plates form and through first of optical splitter output, the second two-route wire polarisation-multiplexed signal exports respectively described first to, the second two half-wave plates, described polarization wave splitter device is by first, the second polarization polarizer forms, first via linear polarization multiplexed signals changes the polarization direction of this signal through described the first half-wave plate, what make the second polarization channels signal in this road signal and the described first polarization polarizer plays folk prescription to quadrature, by described first polarization polarizer output the first polarization channels signal, the the second road palarization multiplexing channel signal changes the polarization direction of this signal through the second half-wave plate, what make the first polarization channels signal in this road signal and the described second polarization polarizer plays folk prescription to quadrature, by second polarization polarizer output the second polarization channels signal.
2. polarization demultiplexing device as claimed in claim 1 is characterized in that described first wave is on chip to be set to a quarter wave plate, and described Second Wave is on chip is set to a half-wave plate, and described polarization wave splitter device is a polarization beam apparatus.
3. palarization multiplexing optical communication system, comprise transmitting terminal and receiving terminal, described transmitting terminal is provided with a polarization beam combiner, close ripple for the polarization signal with first, second two quadratures and become polarisation-multiplexed signal output, it is characterized in that described receiving terminal is provided with a described polarization demultiplexing device of claim 1 or 2, be used for polarisation-multiplexed signal is separated into two first, second polarization signal outputs, described transmitting terminal also comprises a phase shift keying device, is used for the first or second polarization signal is added pilot signal.
4. palarization multiplexing optical communication system as claimed in claim 3, characterized by further comprising a feedback control function module, this feedback control function module receives the output signal of palarization multiplexing optical communication system output and controls the polarization state of first, second wave plate device adjustment polarisation-multiplexed signal in the polarization demultiplexing device according to this output signal.
5. palarization multiplexing optical communication system implementation method, is characterized in that comprising the steps:
A10, at the transmitting terminal of this system, the modulation of polarization direction of first, second polarization signal is become two mutually orthogonal bundle polarization signals;
A20, add pilot signal on the first or second polarization signal;
A30, with added polarization signal and the multiplexing polarisation-multiplexed signal that becomes of another polarization signal of pilot signal together, be sent to receiving terminal through fibre circuit;
A40, at the receiving terminal of this system, with quarter wave plate with input polarization arbitrarily polarisation-multiplexed signal become the linear polarization multiplexed signals;
A50, the linear polarization multiplexed signals is divided into two-way and first via signal changes the polarization direction of this signal by the first half-wave plate, make the second polarization channels signal of first via signal and its back first polarization polarizer play folk prescription to quadrature, thereby by first polarization polarizer output the first polarization channels signal; The the second road signal changes the polarization direction of this signal by the second half-wave plate, make the first polarization channels signal in the second road signal and its back the second polarization polarizer play folk prescription to quadrature, thereby by second polarization polarizer output the second polarization channels signal.
6. palarization multiplexing optical communication system implementation method as claimed in claim 5 is characterized in that the output signal of this system's output that quarter wave plate and first, second half-wave plate receive according to the feedback control function module adjusts the polarization state of polarisation-multiplexed signal.
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| CN102043255B (en) * | 2010-11-18 | 2012-07-25 | 华中科技大学 | Polarization interference-based full-light OFDM signal multiplexing and demultiplexing device |
| CN102571197B (en) * | 2011-12-29 | 2014-10-08 | 东南大学 | Fast polarization control method based on combined wave plate polarization adjustment |
| CN103840883A (en) * | 2013-08-16 | 2014-06-04 | 北京邮电大学 | Method for restraining stimulated Raman scattering crosstalk in two-way optical fiber transmission |
| CN103560833A (en) * | 2013-08-16 | 2014-02-05 | 北京邮电大学 | Method for restraining SRS crosstalk in optical access network |
| CN105490769B (en) * | 2015-12-09 | 2017-11-10 | 武汉邮电科学研究院 | Polarize unrelated from coherent OFDM fibre-optic transmission system (FOTS) and transmission method |
| WO2018108235A1 (en) * | 2016-12-12 | 2018-06-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and apparatus for dual polarisation optical communication |
| CN110297230B (en) * | 2019-07-15 | 2021-02-12 | 北京理工大学 | Satellite-borne laser radar echo signal simulator |
| CN110824719B (en) * | 2019-11-20 | 2022-03-29 | 长春理工大学 | 90-degree spatial optical mixer with polarization parameter optimization configuration |
| CN114866156A (en) | 2021-02-05 | 2022-08-05 | 富士通株式会社 | Polarization recovery device and method, and optical receiver |
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| CN101453268A (en) * | 2007-12-06 | 2009-06-10 | 北京高光科技有限公司 | Optical communication system based on polarization multiplex technique and method thereof |
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