CN102305985B - Method and device for all-optical regeneration of high-speed differential quadrature reference phase shift keying (DQPSK) modulation signal - Google Patents
Method and device for all-optical regeneration of high-speed differential quadrature reference phase shift keying (DQPSK) modulation signal Download PDFInfo
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Abstract
The invention discloses a method and a device for all-optical regeneration of a high-speed differential quadrature reference phase shift keying (DQPSK) modulation signal. The method comprises the following steps of: modulating the DQPSK signal; regenerating an on-off-keying (OOK) signal; and recovering the DQPSK signal. An aggravated DQPSK optical signal on a transmission link enters a demodulation unit of the DQPSK signal; the DQPSK signal is demodulated into the OOK signal, and simultaneously phase noises are converted into intensity noises; then an OOK signal regenerator performs amplitude regeneration on the optical signal; and finally, a polarization controller and a polarizer convert the OOK signal into the DQPSK signal to realize the all-optical regeneration of the DQPSK signal. By the method and the device, the all-optical regeneration of the DQPSK signal can be realized, a difficulty in the all-optical regeneration of the DQPSK signal is expected to be overcome, and a probable solution is provided for solving similar problems in high-speed optical signal processing.
Description
Technical field
The present invention relates to high-speed high capacity all-optical network communication technical field, be specifically related to full optical regeneration method and the device of novel high-speed modulation format.
Background technology
In in recent years, wavelength-division multiplex technique, forward error correction coding, Raman distributed amplifier, novel Transmission Fibers have all greatly improved capacity and the distance of optical fiber telecommunications system.The modulation format of optical fiber telecommunications system mainly is to adopt traditional on-off keying (On-Off-Keying, OOK), and a series of new modulation formats begin to be paid attention in optical fiber telecommunications system gradually, and new modulation format has improved signal for chromatic dispersion, light filtering and nonlinear tolerance.These modulation formats have comprised CRZ(Chirped Return toZero), AMI (Alternate Mark Inversion), CSRZ (Carrier Suppressed Return to Zero) and PSK (Phase Shift Keying).And the high-transmission capacity of the single fiber that report is arranged has at present reached 25.6Tb/s.For high transfer rate like this, adopt the OOK modulation signal of traditional RZ or NRZ pattern to be difficult to realize, can only adopt the multi-system modulation format of the higher phase-magnitude hybrid modulation of spectrum efficiency.Just because of this, studied widely in present high-speed light transmission plan such as modulation formats such as DQPSK, be acknowledged as the ideal chose of band optical fiber communication system of future generation.
Meanwhile, although with respect to traditional OOK modulation format, phase modulation format has higher tolerance to the nonlinear effect in the transmission, but the linear phase noise of being introduced by image intensifer in the high-speed transfer, and by the nonlinear phase noise that the line nonlinearity effect causes, will cause the severe exacerbation of differential phase-shift keying (DPSK) (DPSK), four phase RPSK relative phase shift keying (DQPSK) equiphase modulation signal quality.In order to guarantee the transmission quality of signal in the following high-speed high capacity optical-fiber network, must regenerate to DPSK, DQPSK signal.Therefore, work out and a kind ofly can realize that the full photo reversal technology to phase modulated signal is the inevitable requirement that adapts to following high-speed light transmission technology development.
At present, for the Study of Regeneration Technique of phase modulated signal, have in the world suitable report, but major part also mainly concentrates on the regeneration aspect of DPSK signal.Common several schemes have: 1, utilize the realization of Cross-phase Modulation or Fiber-optic parameter enlarge-effect to again amplification and the again shaping of RZ-DPSK signal in highly nonlinear optical fiber; 2, utilize semiconductor optical amplifier (SOA) to realize the regenerative amplification of DPSK in conjunction with the Sagnac ring; 3, by the polarization interference structure phase noise of DPSK is converted to intensity noise, simultaneously in the data pulse of OOK, remain with phase information, utilize SOA to come strength signal is realized again shaping, utilize at last low noise EDFA that the DPSK signal of regeneration is amplified again.
And for the Study of Regeneration Technique of DQPSK signal, then rarely seen relevant report.The K. Cvecek of research group of Germany proposes to utilize nonlinear amplifying loop mirror (NALM) that the DQPSK signal is carried out the amplitude regeneration tests, but this scheme is merely able to the amplitude noise that is caused by ASE is regenerated, and does not have ability that the phase noise that worsens in the DQPSK signal is regenerated.In the regeneration scheme of the Masayuki Matsumoto of research group of Japan by the emulation proposition, at first the DQPSK signal is interfered by time-delay, be converted to the OOK signal, then by the 2R regenerator OOK signal is carried out shaping and amplitude regeneration, OOK signal after the regeneration interacts the DQPSK signal after finally obtaining regenerating with the time clock of extracting in full optical phase modulator subsequently.
At home, the achievement in research of full photo reversal technology is embodied in the regeneration to the OOK signal mostly, by contrast, then carries out evening for the research of phase modulated signal in many colleges and universities and research institution, and is main mainly with theoretical simulation research.And for the research of DQPSK signal, work concentrates on the aspects such as modulation, transmission, demodulation of signal mostly.
Importantly, the phase modulation format take DPSK, DQPSK as representative is paid close attention in a large number in the research of high-speed light transmission technology at present in the world, and becomes a kind of inevitable research tendency.But the research major part of its regeneration techniques also is limited to research to DPSK, does not then propose yet effective solution for the regeneration of DQPSK.
Summary of the invention
The present invention seeks to realize the full photo reversal of DQPSK modulation signal, the problems such as the system complex, the cost that exist in the current DQPSK signal regeneration method are high to solve, poor stability provide a kind of full optical regeneration method and device of novel high speed DQPSK modulation signal.
The present invention at first provides a kind of full optical reproducing apparatus of high speed DQPSK modulation signal, and this device comprises:
The first Polarization Controller: the deterioration DQPSK flashlight that is used for inputting on the transmission link is realized the conversion of 45 ° of line polarisations;
Differential group delay line: be used for the DQPSK signal after the conversion of the first Polarization Controller is realized that signal on x axle and two polarization states of y axle has the time-delay of a symbol period;
The first photo-coupler: be used for the light signal behind the differential group delay is divided into two-way, the first via is as the real part of DQPSK signal, the second tunnel imaginary part as the DQPSK signal;
The first via comprises: the second Polarization Controller, the second photo-coupler and the first polarization beam apparatus, the real part of first via DQPSK signal makes by the second Polarization Controller and produces one+45 ° phase differential between the polarization state of two main shafts, ellipse polarisation by second latter two quadrature of photo-coupler enters the first polarization beam apparatus again, ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary OOK data stream is passed through after the identical distance in ring, output terminal at the first polarization beam apparatus produces polarization interference, and a part of phase noise among the DQPSK is transformed into amplitude noise and is present in the OOK data stream of two complementations at this moment;
The second the tunnel comprises: the 3rd Polarization Controller, the 3rd photo-coupler and the second polarization beam apparatus, the imaginary part of the second road DQPSK signal makes by the 3rd Polarization Controller equally and produces-45 ° of phase differential between the polarization state of two main shafts, ellipse polarisation by the 3rd latter two quadrature of photo-coupler enters the second polarization beam apparatus again, ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary OOK data stream is passed through after the identical distance in ring, output terminal at the second polarization beam apparatus can produce polarization interference, and a part of phase noise among the DQPSK is transformed into amplitude noise and is present in the OOK data stream of two complementations at this moment;
Mach moral structure regenerator once: be used for finishing the light intensity regeneration to above-mentioned two paths of data, adjust simultaneously the time-delay of two paths of signals, and two ways of optical signals is interfered and become one road signal the most at last;
Optical band pass filter: be used for the noise that the once moral structure regenerator regenerative process light amplification of filtering Mach is introduced;
The 4th Polarization Controller:
The polarizer: the signal of pairwise orthogonal is become a polarization state to regenerate the DQPSK signal;
Erbium-Doped Fiber Amplifier (EDFA):
Described Mach once moral structure regenerator is to have once moral structure and have the semiconductor optical amplifier of regeneration function of Mach.
The present invention provides a kind of full optical regeneration method that adopts the above device to realize high speed DQPSK modulation signal simultaneously, and the method realizes as follows:
1st, by the first Polarization Controller (PC1) polarization state of the DQPSK signal that worsens is become linear polarization at 45 °;
2nd, the DQPSK signal after turning the upper step is partially sent into differential group delay line (DGD), makes signal on two polarization states of x axle and y axle that the time-delay of a symbol period be arranged;
3rd, and then by the first photo-coupler (OC1) output of differential group delay line is divided into identical two-way: the first via is expressed as real part I passage wherein, and following the second the tunnel represent imaginary part Q passage;
The 4th, in first via real part I passage, make by the second Polarization Controller and produce one+45 ° phase differential between the polarization state of two main shafts, ellipse polarisation by latter two quadrature of the second photo-coupler (OC2) enters the first polarization beam apparatus (PBS1) again, ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary OOK data stream is passed through after the identical distance in ring, output terminal at the first polarization beam apparatus produces polarization interference, and a part of phase noise among the DQPSK is transformed into amplitude noise and is present in the OOK data stream of two complementations at this moment;
The 5th, equally, in the second tunnel imaginary part Q passage, make by the 3rd Polarization Controller and produce-45 ° of phase differential between the polarization state of two main shafts, ellipse polarisation by latter two quadrature of the 3rd photo-coupler (OC3) enters the second polarization beam apparatus (PBS2) again, ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary OOK data stream is passed through after the identical distance in ring, output terminal at the second polarization beam apparatus produces polarization interference, and a part of phase noise among the DQPSK is transformed into amplitude noise and is present in the OOK data stream of two complementations at this moment;
6th, above-mentioned first via real part I passage and the second tunnel imaginary part Q channel signal enter once moral structure regenerator of Mach respectively after the 4th step, the 5th step process, and utilize regenerator respectively two paths of signals to be finished the amplitude regeneration function; In once output place of moral structure regenerator of Mach, realize adjusting the relative phase relation of the first via, the second road signal by the electric current of regulating two arms, the signal after the final two-way regeneration Mach once the output terminal of moral structure regenerator interfere and become one road signal;
7th, with amplifying the noise of introducing in the optical band pass filter filtering OOK signal regeneration;
8th, corresponding polarization axle change is at 45 ° respectively the signal of polarization state quadrature to use the 4th Polarization Controller, by the polarizer signal of pairwise orthogonal is become a polarization state to regenerate the DQPSK signal at last;
9th, the DQPSK signal after the regeneration is amplified so that subsequent applications.
Advantage of the present invention and beneficial effect:
1, the scheme simple economy is practical, and all the other are passive device except Mach once moral structure regenerator and Erbium-Doped Fiber Amplifier (EDFA) (EDFA), and are simple in structure.2, truly full photo reversal does not wherein relate to light-electrical-optical conversion.3, solved the current difficult problem that can't realize the full light of DQPSK signal.
Description of drawings
Fig. 1 is the general structure schematic diagram of the full photo reversal of DQPSK signal among the present invention;
Fig. 2 is DQPSK signal conversion work block diagram among the present invention.
Among the figure, 1 is the first Polarization Controller, and 2 is second Polarization Controllers, 3 is the 3rd Polarization Controllers, 4 is first photo-couplers, and 5 is second photo-couplers, and 6 is the 3rd photo-couplers, 7 is first polarization beam apparatus, 8 is second polarization beam apparatus, the 9th, and optical band pass filter, 10 is the 4th Polarization Controllers, the 11st, the polarizer, the 12nd, Erbium-Doped Fiber Amplifier (EDFA).
Now by reference to the accompanying drawings the full photo reversal process of DQPSK signal is elaborated.
Embodiment
The full optical reproducing apparatus of embodiment 1, high speed DQPSK modulation signal
As shown in Figure 1, this device comprises:
The first Polarization Controller 1: the deterioration DQPSK flashlight that is used for inputting on the transmission link is realized the conversion of 45 ° of line polarisations;
Differential group delay line: be used for the DQPSK signal after the conversion of the first Polarization Controller is realized that signal on x axle and two polarization states of y axle has the time-delay of a symbol period;
The first photo-coupler 4: be used for the light signal behind the differential group delay is divided into two-way, the first via is as the real part of DQPSK signal, the second tunnel imaginary part as the DQPSK signal;
The first via comprises: the second Polarization Controller 2, the second photo-coupler 5 and the first polarization beam apparatus 7, the real part of first via DQPSK signal makes by the second Polarization Controller and produces one+45 ° phase differential between the polarization state of two main shafts, ellipse polarisation by second latter two quadrature of photo-coupler enters the first polarization beam apparatus again, ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary OOK data stream is passed through after the identical distance in ring, output terminal at the first polarization beam apparatus produces polarization interference, and a part of phase noise among the DQPSK is transformed into amplitude noise and is present in the OOK data stream of two complementations at this moment;
The second the tunnel comprises: the 3rd Polarization Controller 3, the 3rd photo-coupler 6 and the second polarization beam apparatus 8, the imaginary part of the second road DQPSK signal makes by the 3rd Polarization Controller equally and produces-45 ° of phase differential between the polarization state of two main shafts, ellipse polarisation by the 3rd latter two quadrature of photo-coupler enters the second polarization beam apparatus again, ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary OOK data stream is passed through after the identical distance in ring, output terminal at the second polarization beam apparatus can produce polarization interference, and a part of phase noise among the DQPSK is transformed into amplitude noise and is present in the OOK data stream of two complementations at this moment;
Mach moral structure regenerator once: be used for finishing the light intensity regeneration to above-mentioned two paths of data, adjust simultaneously the time-delay of two paths of signals, and two ways of optical signals is interfered and become one road signal the most at last;
Optical band pass filter 9: be used for the noise that the once moral structure regenerator regenerative process light amplification of filtering Mach is introduced;
The 4th Polarization Controller 10: corresponding polarization axle change is at 45 ° respectively the signal of polarization state quadrature;
The polarizer 11: the signal of pairwise orthogonal is become a polarization state to regenerate the DQPSK signal;
Erbium-Doped Fiber Amplifier (EDFA) 12: the DQPSK signal after the regeneration is amplified so that subsequent applications;
Described Mach once moral structure regenerator is to have once moral structure and have the semiconductor optical amplifier of regeneration function of Mach.
The full optical regeneration method of embodiment 2, high speed DQPSK modulation signal
The full optical regeneration method of high speed DQPSK modulation signal of the present invention comprises, the demodulation of DQPSK signal, OOK signal regeneration, the generation of DQPSK signal after the regeneration.Concrete steps are as follows:
The deterioration DQPSK signal that transmits from transmission line at first enters the DQPSK signal demodulation part of regenerating unit shown in Figure 1, by the first Polarization Controller 1 (PC1) polarization state of the DQPSK signal that worsens is become linear polarization at 45 °;
Then the DQPSK signal is through differential group delay line (DGD), makes signal on two polarization states of x axle and y axle that the time-delay of a symbol period be arranged;
And then by the first photo-coupler 4(OC1) output of differential group delay line DGD is divided into identical two-way: the first via is expressed as the I passage wherein, and following the second the tunnel represent the Q passage, in the I passage by the second Polarization Controller 2(PC2) make and produce one+45 ° phase differential between the polarization state of two main shafts, again by the second photo-coupler 5(OC2) the ellipse polarisation of latter two quadrature enters the first polarization beam apparatus 7(PBS1), ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary OOK data stream is passed through after the identical distance in ring, output terminal at the first polarization beam apparatus can produce polarization interference, and a part of phase noise among the DQPSK is transformed into amplitude noise and is present in the OOK data stream of two complementations at this moment.Same by the 3rd Polarization Controller 3(PC3 at the Q passage) make-45 ° of phase differential of generation between the polarization state of two main shafts, again by the 3rd photo-coupler 6(OC3) the ellipse polarisation of latter two quadrature enters the second polarization beam apparatus 8(PBS2), ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary OOK data stream is passed through after the identical distance in ring, output terminal at the second polarization beam apparatus can produce polarization interference, and a part of phase noise among the DQPSK is transformed into amplitude noise and is present in the OOK data stream of two complementations at this moment.At this OOK signal that obtains the two-way complementation, in this process, make the phase noise of DQPSK signal be converted into amplitude noise, see Fig. 2.
Above-mentioned I passage and Q channel signal enter once moral structure regenerator of Mach, utilize regenerator respectively two paths of signals to be finished the amplitude regeneration function.
At Mach once in the moral structure regenerator, can realize adjusting the up and down relative phase relation of two paths of signals by the electric current of regulating two arms, signal after the final two-way regeneration Mach once the output terminal of moral structure regenerator interfere and become one road signal, in this process, eliminate amplitude noise the OOK signal is regenerated, make simultaneously the signal synthetic a tunnel of two-way complementation.
Then come the noise that amplifier is introduced in the regenerative process of filtering front by optical band pass filter 9.
With the polarizer 11 signal after regenerating is become the pattern the same with original DQPSK signal finally by crossing the 4th Polarization Controller 10, and carry out light amplification so that use the back through Erbium-Doped Fiber Amplifier (EDFA) 12.
Claims (3)
1. the full optical reproducing apparatus of high speed four phase RPSK relative phase shift keying modulation signals is characterized in that this device comprises:
The first Polarization Controller: the deterioration four phase RPSK relative phase shift keying flashlights that are used for inputting on the transmission link are realized the conversion of 45 ° of line polarisations;
Differential group delay line: be used for four phase RPSK relative phase shift keying signals after the conversion of the first Polarization Controller are realized that signal on x axle and two polarization states of y axle has the time-delay of a symbol period;
The first photo-coupler: be used for the light signal behind the differential group delay is divided into two-way, the first via is as the real part of four phase RPSK relative phase shift keying signals, the second tunnel imaginary part as four phase RPSK relative phase shift keying signals;
The first via comprises: the second Polarization Controller, the second photo-coupler and the first polarization beam apparatus, the real part of the first via four phase RPSK relative phase shift keying signals makes by the second Polarization Controller and produces one+45 ° phase differential between the polarization state of two main shafts, ellipse polarisation by second latter two quadrature of photo-coupler enters the first polarization beam apparatus again, ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary on-off keying data stream is passed through after the identical distance in ring, output terminal at the first polarization beam apparatus produces polarization interference, and a part of phase noise in the four phase RPSK relative phase shift keyings is transformed into amplitude noise and is present in the on-off keying data stream of two complementations at this moment;
The second the tunnel comprises: the 3rd Polarization Controller, the 3rd photo-coupler and the second polarization beam apparatus, the imaginary part of the second tunnel four phase RPSK relative phase shift keying signal makes by the 3rd Polarization Controller equally and produces-45 ° of phase differential between the polarization state of two main shafts, ellipse polarisation by the 3rd latter two quadrature of photo-coupler enters the second polarization beam apparatus again, ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary on-off keying data stream is passed through after the identical distance in ring, output terminal at the second polarization beam apparatus can produce polarization interference, and a part of phase noise in the four phase RPSK relative phase shift keyings is transformed into amplitude noise and is present in the on-off keying data stream of two complementations at this moment;
Mach moral structure regenerator once: be used for finishing the light intensity regeneration to above-mentioned two paths of data, adjust simultaneously the time-delay of two paths of signals, and two ways of optical signals is interfered and become one road signal the most at last;
Optical band pass filter: be used for the noise that the once moral structure regenerator regenerative process light amplification of filtering Mach is introduced;
The 4th Polarization Controller: corresponding polarization axle change is at 45 ° respectively the signal of polarization state quadrature;
The polarizer: the signal of pairwise orthogonal is become a polarization state to regenerate four phase RPSK relative phase shift keying signals;
Erbium-Doped Fiber Amplifier (EDFA): be used for the amplification to four phase RPSK relative phase shift keying signals after regenerating.
2. device according to claim 1, it is characterized in that described Mach once moral structure regenerator be to have once moral structure and have the semiconductor optical amplifier of regeneration function of Mach.
3. one kind is adopted the described device of claim 1 to realize the at a high speed full optical regeneration method of four phase RPSK relative phase shift keying modulation signals, it is characterized in that, the method realizes as follows:
The polarization state of the four phase RPSK relative phase shift keying signals that 1st, will worsen by the first Polarization Controller (PC1) becomes linear polarization at 45 °;
2nd, four phase RPSK relative phase shift keying signals after turning the upper step are partially sent into differential group delay line (DGD), make signal on two polarization states of x axle and y axle that the time-delay of a symbol period be arranged;
3rd, and then by the first photo-coupler (OC1) output of differential group delay line is divided into identical two-way: the first via is expressed as real part I passage wherein, and following the second the tunnel represent imaginary part Q passage;
The 4th, in first via real part I passage, make by the second Polarization Controller and produce one+45 ° phase differential between the polarization state of two main shafts, ellipse polarisation by latter two quadrature of the second photo-coupler (OC2) enters the first polarization beam apparatus (PBS1) again, ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary on-off keying data stream is passed through after the identical distance in ring, output terminal at the first polarization beam apparatus produces polarization interference, and a part of phase noise in the four phase RPSK relative phase shift keyings is transformed into amplitude noise and is present in the on-off keying data stream of two complementations at this moment;
The 5th, equally, in the second tunnel imaginary part Q passage, make by the 3rd Polarization Controller and produce-45 ° of phase differential between the polarization state of two main shafts, ellipse polarisation by latter two quadrature of the 3rd photo-coupler (OC3) enters the second polarization beam apparatus (PBS2) again, ellipse polarisation becomes quadrature and two complementary line polarisations afterwards, latter two complementary on-off keying data stream is passed through after the identical distance in ring, output terminal at the second polarization beam apparatus produces polarization interference, and a part of phase noise in the four phase RPSK relative phase shift keyings is transformed into amplitude noise and is present in the on-off keying data stream of two complementations at this moment;
6th, above-mentioned first via real part I passage and the second tunnel imaginary part Q channel signal enter once moral structure regenerator of Mach respectively after the 4th step, the 5th step process, and utilize regenerator respectively two paths of signals to be finished the amplitude regeneration function; Once in the moral structure regenerator, realize adjusting the relative phase relation of the first via, the second road signal at Mach by the electric current of regulating two arms, the signal after the final two-way regeneration Mach once the output terminal of moral structure regenerator interfere and become one road signal;
7th, with amplifying the noise of introducing in the signal regeneration of optical band pass filter filtering on-off keying;
8th, corresponding polarization axle change is at 45 ° respectively the signal of polarization state quadrature to use the 4th Polarization Controller, by the polarizer signal of pairwise orthogonal is become a polarization state to regenerate four phase RPSK relative phase shift keying signals at last;
9th, four phase RPSK relative phase shift keying signals after the regeneration are amplified so that subsequent applications.
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| CN103117812B (en) * | 2013-01-24 | 2015-08-05 | 华中科技大学 | A kind of regenerator being applicable to WDM-DPSK light signal |
| CN103780308B (en) * | 2014-01-13 | 2017-01-25 | 电子科技大学 | Multi-wavelength all-optical regenerative device capable of inhibiting crosstalk and method thereof |
| CN104378159B (en) * | 2014-12-01 | 2017-04-12 | 中国人民解放军信息工程大学 | Multilayer modulation visible light communication method, transmitter, receiver and system |
| CN107070559B (en) * | 2017-03-31 | 2019-04-30 | 南京恒高光电研究院有限公司 | A kind of full optical phase modulator |
| CN112383362B (en) * | 2020-10-17 | 2021-12-03 | 北京邮电大学 | Method and system for regenerating MPSK (Multi-phase Shift keying) signal carrying ASE (amplified spontaneous emission) noise |
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