CN102255664B - Polarization multiplexing communication method and system based on time interleaving return to zero code - Google Patents
Polarization multiplexing communication method and system based on time interleaving return to zero code Download PDFInfo
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Abstract
The invention discloses a polarization multiplexing communication method and system based on a time interleaving return to zero code. The method comprises the following steps of: making linearly polarized light output by a continuous-wave laser pass through a polarization beam splitter to form two paths of light carriers with equal power and orthogonal polarization states, wherein the slow axis of the polarization beam splitter and the polarization direction of the linearly polarized light form an angle of 45 degrees; pre-coding two paths of bit streams to be transmitted to form two paths of data, modulating the two paths of data onto the two paths of light carriers respectively to form two paths of modulated light signals, performing polarization multiplexing with the polarization beam splitter to form a polarization multiplexing signal S and transmitting the polarization multiplexing signal; and converting the phase information of the received polarization multiplexing signal S into amplitude information, performing photoelectric conversion and electric filtering to obtain an electric signal, transmitting the electric signal into a sampling decider, and separating data obtained by deciding according to the time interleaving relation between two paths of bit streams to be transmitted to form two paths of data streams which correspond to two paths of bit streams to be transmitted respectively. According to the method and the system, the nonlinearity resistance of the polarization multiplexing system can be improved effectively independent of an automatic polarization controller or complex coherent reception.
Description
Technical field
The present invention relates to optical communication field, particularly relate to polarization multiplexing communication method and system that a kind of time-based interleaves NRZ.
Background technology
Light wave is transverse electro-magnetic wave, has polarization characteristic.For optical fiber communication, the challenge that polarisation of light had both brought polarization mode dispersion, Polarization Dependent Loss etc. to overcome, also make outside the functions such as intensity, phase place, frequency, can utilize polarisation of light to carry out carry information, PolMux (Polarization Multiplexing, the palarization multiplexing) technology that proposes of the nineties later stage for example.The PolMux Technology Need is by means of the automatic polarization controller, but the automatic polarization controller performance of commercialization is limited and expensive at present, directly causes the PolMux technology still can't obtain at present the engineering application.
The light coherent reception technology based on Digital Signal Processing of industry research in recent years, can be under the prerequisite that does not need the automatic polarization controller, realize the polarization demultiplexing in electric territory, but light coherent reception technology is limited to the performance of the devices such as its complexity and analog to digital converter, is difficult to commercial in a short time.
Along with the development of technology, the mostly existing corresponding solution preferably of the linear damage in the light transmission, nonlinear impairments highlights the restriction of system transmission performance.G.Charlet et al. proposes the method replaced by the adjacent pulse polarization, destroys the polarization conditions of nonlinear effect, effectively promotes the anti-non-linear ability of marine-cable light transmission system.C.Xie et al. points out that nonlinear effect maximum in polarisation multiplex system is XPolM (Cross Polarization Modulation, the cross polarization modulation), propose iRZ (Time-interleaving Return-to-Zero, the time interleaves NRZ) and can effectively suppress XPolM.
Therefore, in order to utilize the high spectrum efficiency of PolMux technology, adapt to the requirement of network to the bottom bandwidth, need to propose the feasible polarization multiplexing scheme of reality, make it can crack the difficult problem that, electricity territory, light territory polarization demultiplexing technology is limited by device performance and technology maturity restriction, can effectively promote the anti-non-linear ability of polarisation multiplex system again simultaneously.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology, the polarization multiplexing communication method and the system that provide a kind of time-based to interleave NRZ, it had not both relied on the current limited devices of performance such as automatic polarization controller, perhaps complicated coherent reception, can effectively promote again the anti-non-linear ability of polarisation multiplex system.
Time-based provided by the invention interleaves the polarization multiplexing communication method of NRZ, comprise the following steps: the linearly polarized light of A, continuous-wave laser output is through polarization beam apparatus, form two-way constant power and mutually orthogonal light carrier C1, the C2 of polarization state, the slow axis of described polarization beam apparatus becomes miter angle with the polarization direction of described linearly polarized light; Two-way bit stream to be transmitted forms two paths of data D1, D2 through precoding processing, D1, D2 are modulated to respectively on described light carrier C1, C2, form light signal S1, S2 after two-way is modulated, S1, S2 complete palarization multiplexing through polarization beam combiner, form polarisation-multiplexed signal S transmission; B, convert the phase information in the described polarisation-multiplexed signal S received to amplitude information, obtain the signal of telecommunication through opto-electronic conversion and electrofiltration ripple, again the described signal of telecommunication is sent into to the sampling decision device, the relation that interleaves in time is separately according to described two-way bit stream to be transmitted for the data that judgement is obtained, form two paths of data stream R1 and R2, respectively corresponding described two-way bit stream to be transmitted.
In technique scheme, the polarization state of light signal S1, S2 after described two-way modulation is mutually orthogonal.
In technique scheme, light signal S1, the S2 after the modulation of described two-way all adopts RZ pattern and differential phase keying (DPSK) coding, and all meets in time pulse and interleave relation.
In technique scheme, the symbol period of light signal S1, S2 after described two-way modulation is identical, and the sampling interval of described sampling decision device is half of S1, S2 symbol period.
In technique scheme, the transmission link that described polarisation-multiplexed signal S forms by Wavelength-division multiplexer/demultiplexer, image intensifer, optical fiber, dispersion compensating fiber or restructural type optical add/drop multiplexer ROADM is transmitted.
Time-based provided by the invention interleaves the palarization multiplexing optical communication system of NRZ, comprise in turn connected palarization multiplexing transmitter, transmission link and palarization multiplexing receiver, described palarization multiplexing transmitter comprises continuous-wave laser, polarization beam apparatus, two precoders, two RZ DPSK modulators and polarization beam combiner, the continuous-wave laser polarization light output, enter polarization beam apparatus, the slow axis of described polarization beam apparatus becomes miter angle with the polarization direction of input line polarised light, polarization beam apparatus output two-way constant power and the mutually orthogonal light carrier C1 of polarization state, C2, two-way bit stream to be transmitted is respectively after precoder completes precoding, form two paths of data D1, D2, D1, D2 respectively through RZ DPSK modulators modulate on two-way light carrier C1, C2, form light signal S1, S2 after two-way is modulated, S1, S2 complete palarization multiplexing through polarization beam combiner, form polarisation-multiplexed signal S, S arrives the palarization multiplexing receiver through transmission link, described palarization multiplexing receiver comprises in turn connected light delay interferometer, balance or single-ended receiver and sampling decision device, the light delay interferometer converts the phase information in the polarisation-multiplexed signal S received to amplitude information, balance or single-ended receiver complete opto-electronic conversion and electrofiltration ripple, and the signal of telecommunication obtained is sent into to the sampling decision device, the relation that interleaves in time is separately according to described two-way bit stream to be transmitted for sampling decision device data that judgement is obtained, form two paths of data stream R1 and R2, respectively the two-way bit stream to be transmitted in corresponding palarization multiplexing transmitter.
In technique scheme, described transmission link comprises Wavelength-division multiplexer/demultiplexer, image intensifer, optical fiber, dispersion compensating fiber or restructural type optical add/drop multiplexer ROADM.
In technique scheme, the polarization state of light signal S1, S2 after described two-way modulation is mutually orthogonal.
In technique scheme, light signal S1, the S2 after the modulation of described two-way all adopts RZ pattern and differential phase keying (DPSK) coding, and all meets in time pulse and interleave relation.
In technique scheme, the symbol period of light signal S1, S2 after described two-way modulation is identical, and the sampling interval of described sampling decision device is half of S1, S2 symbol period.
The present invention utilizes the time domain pulse of iRZ to interleave characteristics, take that differential phase keying (DPSK) and light delay interfere is basis, a kind of palarization multiplexing optical communication system is provided, both solved the practical difficult problem of polarisation-affecting multiplex technique, can effectively overcome the nonlinear effect of polarisation multiplex system again, be particularly suitable for the application scenarioss such as metropolitan area network.
Compared with prior art, advantage of the present invention is as follows:
(1) without the limited and expensive automatic polarization controller of the normal light territory necessary performance of polarization demultiplexing.
(2) without complicated light coherent receiver.
(3) can effectively promote the anti-non-linear ability of polarisation multiplex system.
(4) simplify system configuration, reduced cost.Common polarization demultiplexing all needs two receivers respectively two polarization channels to be received, and in the present invention, two polarization channels receive together, only need a receiver, have therefore simplified system configuration, have reduced cost.
The accompanying drawing explanation
The system architecture diagram that Fig. 1 is the embodiment of the present invention;
The structural representation that Fig. 2 is palarization multiplexing transmitter in the embodiment of the present invention;
The light pulse schematic diagram that time interleaves and polarization state is staggered that Fig. 3 is palarization multiplexing transmitter output in the embodiment of the present invention;
The structural representation that Fig. 4 is palarization multiplexing receiver in the embodiment of the present invention;
The receiving terminal electric eye figure that Fig. 5 is palarization multiplexing receiver in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The time-based that the embodiment of the present invention provides interleaves the polarization multiplexing communication method of NRZ, comprises the following steps:
The linearly polarized light of A, continuous-wave laser output, through polarization beam apparatus, forms two-way constant power and mutually orthogonal light carrier C1, the C2 of polarization state, and the slow axis of described polarization beam apparatus becomes miter angle with the polarization direction of described linearly polarized light; Two-way bit stream to be transmitted forms two paths of data D1, D2 through precoding processing, D1, D2 are modulated to respectively on described light carrier C1, C2, form light signal S1, S2 after two-way is modulated, S1, S2 complete palarization multiplexing through polarization beam combiner, form polarisation-multiplexed signal S transmission; Concrete, but the transmission link that polarisation-multiplexed signal S forms by Wavelength-division multiplexer/demultiplexer, image intensifer, optical fiber, dispersion compensating fiber or ROADM (Reconfigurable Optical Add-Drop Multiplexer, restructural type optical add/drop multiplexer) is transmitted.The polarization state of light signal S1, S2 after described two-way modulation is mutually orthogonal, S1, S2 all adopt RZ pattern (Return to Zero Code, NRZ) and differential phase keying (DPSK) (DPSK, Differential Phase Shift Keying) coding, and all meet in time pulse and interleave relation.
B, convert the phase information in the described polarisation-multiplexed signal S received to amplitude information, obtain the signal of telecommunication through opto-electronic conversion and electrofiltration ripple, again the described signal of telecommunication is sent into to the sampling decision device, the sampling interval of sampling decision device is S1, S2 symbol period half (symbol period of S1, S2 is identical).The data that judgement is obtained, according to described two-way bit stream to be transmitted, the relation that interleaves in time separately, forms two paths of data stream R1 and R2, corresponding described two-way bit stream to be transmitted respectively, thus reach the transfer of data purpose.
Shown in Figure 1, the palarization multiplexing optical communication system that the time-based that the embodiment of the present invention provides interleaves NRZ comprises: connected palarization multiplexing transmitter, transmission link and palarization multiplexing receiver in turn.
Shown in Figure 2, the palarization multiplexing transmitter comprises: continuous-wave laser (CW Laser), polarization beam apparatus (PBS), two precoders (Pre-coder), two RZ DPSK modulators (RZ DPSK Modulator) and polarization beam combiner (PBC).The continuous-wave laser polarization light output, enter polarization beam apparatus, and the slow axis of described polarization beam apparatus becomes miter angle with the polarization direction of input line polarised light, polarization beam apparatus output two-way constant power and mutually orthogonal light carrier C1, the C2 of polarization state.Two-way bit stream to be transmitted is respectively after precoder completes precoding, form two paths of data D1, D2, D1, D2 respectively through RZ DPSK modulators modulate separately on corresponding light carrier C1, C2, form light signal S1, S2 after two-way is modulated, S1, S2 complete palarization multiplexing through polarization beam combiner, form polarisation-multiplexed signal S.
Shown in Figure 3, two ways of optical signals S1 and S2, each modulated signal of phase shift keying naturally not only, and they also to have the polarization state of following two feature: the one, S1 and S2 mutually orthogonal; The 2nd, S1 and S2 adopt the RZ code, and meet in time strict pulse and interleave relation.The symbol period of S1, S2 is identical, and the conventional letter cycle is Ts, adjacent two RZ pulses (its polarization state is mutually orthogonal) center, on the time at a distance of 0.5Ts.Interleave arrangement by this time, can keep circuit luminous power substantially constant, thereby weaken the nonlinear effects such as SPM (from phase-modulation), XPM (Cross-phase Modulation, Cross-phase Modulation); Interleave the adjacent pulse polarization state quadrature of common formation by palarization multiplexing and time, can effectively suppress the nonlinear effects such as iFWM (intra-channel Four Wave Mixing, four wave mixing in channel), XPolM.
Shown in Figure 1, the polarisation-multiplexed signal S of polarization transmitter machine output, through the transmission of transmission link, delivers to the palarization multiplexing receiver.Transmission link comprises the variety of network components such as Wavelength-division multiplexer/demultiplexer, image intensifer, optical fiber, dispersion compensating fiber, ROADM.
Shown in Figure 4, the palarization multiplexing receiver comprises in turn connected light delay interferometer (ODI, Optical Delay Interferometer), balance or single-ended receiver and sampling decision device.Arrive the polarisation-multiplexed signal S of palarization multiplexing receiver through transmission link, at first enter ODI, ODI converts the phase information in the polarisation-multiplexed signal S received to amplitude information, is convenient to carry out the strength investigation of square-law, and strength investigation is completed by balance or single-ended receiver.This ODI is general ODI in existing common DPSK receiver, and the settings such as its time delay, phase shift are without doing any special arrangement.Balance or single-ended receiver complete opto-electronic conversion and electrofiltration ripple, obtain the signal of telecommunication.
The electric eye figure of the signal of telecommunication is shown in Figure 5, two adjacent eye pattern centers, on the time at a distance of 0.5Ts.Common DPSK receiver, the sampling interval is Ts.In the embodiment of the present invention, the sampling interval of sampling decision device is 0.5Ts.The signal of telecommunication is sent into to the sampling decision device, the relation that interleaves in time is separately according to described two-way bit stream to be transmitted for sampling decision device data that judgement is obtained, form two paths of data stream R1 and R2, two-way bit stream to be transmitted in the corresponding palarization multiplexing transmitter of difference, thus reach the transfer of data purpose.
Palarization multiplexing receiver in the embodiment of the present invention has following three advantages: the one, without complicated light coherent receiver; The 2nd, without the limited and expensive automatic polarization controller of the normal light territory necessary performance of polarization demultiplexing; Three is that two polarization channels receive together, only need a receiver, and common polarization demultiplexing all needs two receivers, respectively two polarization channels is received.
Visible, the embodiment of the present invention can not only effectively suppress the nonlinear effect in the light transmission, and has advantages of that system configuration is simple, cost is lower, realizability is higher.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (6)
1. a time-based interleaves the polarization multiplexing communication method of NRZ, it is characterized in that, comprises the following steps:
The linearly polarized light of A, continuous-wave laser output, through polarization beam apparatus, forms two-way constant power and mutually orthogonal light carrier C1, the C2 of polarization state, and the slow axis of described polarization beam apparatus becomes miter angle with the polarization direction of described linearly polarized light; Two-way bit stream to be transmitted forms two paths of data D1, D2 through precoding processing, D1, D2 are modulated to respectively on described light carrier C1, C2, form light signal S1, S2 after two-way is modulated, the polarization state of light signal S1, S2 after described two-way modulation is mutually orthogonal, S1, S2 all adopt RZ pattern and differential phase keying (DPSK) coding, and all meet in time pulse and interleave relation; S1, S2 complete palarization multiplexing through polarization beam combiner, form polarisation-multiplexed signal S transmission;
B, convert the phase information in the described polarisation-multiplexed signal S received to amplitude information, obtain the signal of telecommunication through opto-electronic conversion and electrofiltration ripple, again the described signal of telecommunication is sent into to the sampling decision device, the relation that interleaves in time is separately according to described two-way bit stream to be transmitted for the data that judgement is obtained, form two paths of data stream R1 and R2, respectively corresponding described two-way bit stream to be transmitted.
2. time-based as claimed in claim 1 interleaves the polarization multiplexing communication method of NRZ, it is characterized in that: the symbol period of light signal S1, S2 after described two-way modulation is identical, and the sampling interval of described sampling decision device is half of S1, S2 symbol period.
3. time-based as claimed in claim 1 or 2 interleaves the polarization multiplexing communication method of NRZ, it is characterized in that: the transmission link that described polarisation-multiplexed signal S forms by Wavelength-division multiplexer/demultiplexer, image intensifer, optical fiber, dispersion compensating fiber and restructural type optical add/drop multiplexer ROADM is transmitted.
4. a time-based interleaves the palarization multiplexing optical communication system of NRZ, it is characterized in that: comprise in turn connected palarization multiplexing transmitter, transmission link and palarization multiplexing receiver,
Described palarization multiplexing transmitter comprises continuous-wave laser, polarization beam apparatus, two precoders, two RZ DPSK modulators and polarization beam combiner, the continuous-wave laser polarization light output, enter polarization beam apparatus, the slow axis of described polarization beam apparatus becomes miter angle with the polarization direction of input line polarised light, polarization beam apparatus output two-way constant power and mutually orthogonal light carrier C1, the C2 of polarization state; Two-way bit stream to be transmitted is respectively after precoder completes precoding, form two paths of data D1, D2, D1, D2 respectively through RZ DPSK modulators modulate on two-way light carrier C1, C2, form light signal S1, S2 after two-way is modulated, the polarization state of light signal S1, S2 after described two-way modulation is mutually orthogonal, S1, S2 all adopt RZ pattern and differential phase keying (DPSK) coding, and all meet in time pulse and interleave relation; S1, S2 complete palarization multiplexing through polarization beam combiner, form polarisation-multiplexed signal S, and S arrives the palarization multiplexing receiver through transmission link;
Described palarization multiplexing receiver comprises in turn connected light delay interferometer, balance or single-ended receiver and sampling decision device, the light delay interferometer converts the phase information in the polarisation-multiplexed signal S received to amplitude information, balance or single-ended receiver complete opto-electronic conversion and electrofiltration ripple, and the signal of telecommunication obtained is sent into to the sampling decision device, the relation that interleaves in time is separately according to described two-way bit stream to be transmitted for sampling decision device data that judgement is obtained, form two paths of data stream R1 and R2, respectively the two-way bit stream to be transmitted in corresponding palarization multiplexing transmitter.
5. time-based as claimed in claim 4 interleaves the palarization multiplexing optical communication system of NRZ, it is characterized in that: described transmission link comprises Wavelength-division multiplexer/demultiplexer, image intensifer, optical fiber, dispersion compensating fiber and restructural type optical add/drop multiplexer ROADM.
6. time-based as described as claim 4 or 5 interleaves the palarization multiplexing optical communication system of NRZ, it is characterized in that: the symbol period of light signal S1, S2 after described two-way modulation is identical, and the sampling interval of described sampling decision device is half of S1, S2 symbol period.
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Address after: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee after: Wuhan post and Telecommunications Science Research Institute Co., Ltd. Address before: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee before: Wuhan Inst. of Post & Telecom Science |