CN101304284B - Multichannel complete light 3R regenerator - Google Patents
Multichannel complete light 3R regenerator Download PDFInfo
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- CN101304284B CN101304284B CN2008100481133A CN200810048113A CN101304284B CN 101304284 B CN101304284 B CN 101304284B CN 2008100481133 A CN2008100481133 A CN 2008100481133A CN 200810048113 A CN200810048113 A CN 200810048113A CN 101304284 B CN101304284 B CN 101304284B
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Abstract
The invention relates to an all-optical 3R regenerator with high speed and large capacity, which belongs to the technical field of an all-optical network communication. The regenerator comprises an optical clock recovery device, an optical nonlinear device and an optical delay interference device; wherein, the optical clock recovery device is used for randomly choosing a line of destroyed signals to extract synchronous optical clock signals from a plurality of lines of destroyed optical signals in a transmission link; the synchronous optical clock signals and a plurality of lines of the destroyed optical signals enter into the nonlinear optical device; the nonlinear optical device is used for realizing a cross phase modulated XPM effect among the optical clock signals and a plurality of lines of the destroyed optical signals; a plurality of optical signals produced by realizing the cross phase modulated XPM effect of the nonlinear optical device enter into the optical delay interference device; the optical delay interference device is a comb-shaped filter which is used for filtering the certain chirp part in each optical signal spectral after the XPM effect happens; meanwhile, noises and deteriorated signal parts are filtered out; a plurality of regenerated optical signals are generated. The multi-channel all-optical 3R regenerator provided by the invention can regenerate each channel in one regenerator at the same time, avoid the destroy to the original signal transmission line owing to the present multi-channel regenerated device adopts the way of separating, regenerating and then combining, keep the integrity of the original transmission line. Meanwhile, the all-optical 3R regenerator with high speed and large capacity overcomes the defects that exist in the present multi-channel 3R regeneration proposal of the complicated system, high realization cost, bad stability and uneasy integration, etc.
Description
Technical field
The present invention relates to high-speed high capacity all-optical network communication technical field, be specifically related to complete light 3 R regenerator.
Background technology
Full light 2R regeneration (amplifying shaping more again) and 3R regeneration (amplify again, shaping again, more regularly) and be the core technology in the high-speed high capacity all-optical network, also be optical technology substitutes the key that the conditional electronic technology realizes real all-optical network.Compare full light 2R regeneration, the power loss that full light 3R regeneration more can effectively reduce and remedy light signal accumulates in transmission course, the noise that image intensifer is introduced, crosstalking of interchannel, and because the timing jitter that factors such as chromatic dispersion and nonlinear effect are introduced and pulse distortion or the like pulse distortion factor, thereby significantly improve the transmission range of light signal.
Full light 3R regeneration just has been the focus of research since all-optical network is born always.In general, full light 3R regeneration all is to regenerate at one road light signal (wavelength).If will multipath light signal as multipath light signal among the wavelength-division multiplex system WDM, be regenerated simultaneously, can only be that multiple signals are separated, respectively each road signal is regenerated again, and then merge signal after each road regeneration.If n road signal is arranged, just need use n regenerator, as shown in Figure 1.Multichannel primary light signal transmits in optical fiber link after merging through a multiplexer (AWG), obtains the multichannel impairment signal.The multichannel impairment signal at first demultiplexes into each independent road impairment signal through a demodulation multiplexer (AWG), and a plurality of 3R regenerators of being made up of device for non-linear optical and clock recovery unit are respectively regenerated respectively again.Again by a multiplexing merging of AWG, obtain the signal after multichannel is regenerated at last.So need with complicated regenerator array, not only system complex, cost improve, and a plurality of regenerator array makes system bulk increase, and stability reduces.In recent years, utilize single regenerator simultaneously multipath light signal in the wdm system to be realized that the demand of 3R regeneration is more and more eager.Wherein Princeton university has proposed a kind of method of utilizing nonlinear optics ring mirror, has realized four road wdm optical signals are regenerated simultaneously.But the method need be used the very big fiber annular interference device of volume, also needs the polarization state of strict control signal, and is very sensitive to ambient temperature vibrations etc., should use inconvenience, also not easy of integration.
Summary of the invention
Problem to be solved by this invention provides a kind of multichannel 3R regenerator, overcomes the system complex that exists in the present realization multichannel 3R regeneration scheme, realizes the cost height, poor stability and shortcoming such as not easy of integration.
For solving the problems of the technologies described above, the present invention proposes a kind of multichannel 3R regenerator, this multichannel 3R regenerator comprises optical clock recovery device, device for non-linear optical and optical time delay interference device, and described optical clock recovery device is used for from the transmission link the impaired light signal of multichannel and chooses one tunnel impaired light signal arbitrarily and extract synchronous optical clock signal; This synchronizable optical clock signal and the impaired light signal of multichannel enter single device for non-linear optical, and the power that the power of clock signal is far longer than impairment signal makes the 3R regeneration between different channels can not interfere with each other, and device for non-linear optical is used to realize the cross-phase modulation XPM effect between optical clock signal and the impaired light signal of multichannel; Realize that through device for non-linear optical the multipath light signal that cross-phase modulation XPM effect is produced enters described optical time delay interference device, described optical time delay interference device is a comb filter, be used for leaching the specific part of warbling that every road light signal spectrum after the XPM effect takes place, the signal section of filtering noise and deterioration generates multichannel reproduced light signal simultaneously.
As preferred version, the frequency interval of described comb filter equals the channel spacing of incident multiple signals.
The multichannel complete light 3 R regenerator that the present invention proposes, can regenerate in a regenerator to each passage simultaneously, avoided existing multichannel regenerating unit because of adopting separate regeneration, remerging the destruction of method, kept the integrality of original transmission line original signal transmission line.Simultaneously, overcome the system complex that exists in the present realization multichannel 3R regeneration scheme, realized the cost height, poor stability and shortcoming such as not easy of integration.
Description of drawings
Fig. 1 is existing multichannel 3R regeneration scheme schematic diagram.
The application scheme schematic diagram of Fig. 2 multichannel complete light 3 R regenerator of the present invention.
The waveform schematic diagram that Fig. 3 is taken place for multichannel complete light 3 R regenerator application scheme of the present invention comprises (a) time domain and (b) frequency domain schematic diagram.
Fig. 4 is the application scheme figure at the multichannel complete light 3 R regenerator of the present invention of 16 passages.
Fig. 5 is the application experiment spectrogram at the multichannel complete light 3 R regenerator of the present invention of 16 passages.
Fig. 6 is the application experiment eye pattern at the multichannel complete light 3 R regenerator of the present invention of 16 passages.
Fig. 7 chooses original, the deterioration of 1,7,10,16 passages, the experiment error code testing comparison diagram of regenerated signal after for the application experiment at the multichannel complete light 3 R regenerator of the present invention of 16 passages respectively.
Specific implementation method
Below in conjunction with accompanying drawing the present invention is described in further detail.
In the application scheme schematic diagram of multichannel complete light 3 R regenerator of the present invention as shown in Figure 2, clock recovery device is used for extracting one the tunnel from multiple signals and carries out clock recovery, obtains and the primary signal clock signal synchronous.Clock recovery is just in order to obtain optical clock signal, thereby carries out next step signal regeneration process.Clock recovery device can adopt a lot of existing apparatus to realize, as semiconductor optical amplifier fiber laser, fabry-perot filter, self-pulsing multi-region laser etc.
Device for non-linear optical can be a semiconductor optical amplifier (SOA), highly nonlinear optical fiber (HNLF), periodic polarized lithium niobate waveguide (PPLN) or the like.According to different devices, select different conditions of work, make the impaired multiple signals of clock signal and multichannel that stronger cross-phase modulation (XPM) effect take place therein simultaneously, for next step realizes that filtering lays the first stone in the time-delay interference device.When impairment signal and clock signal are present in the device for non-linear optical simultaneously, and under the situation of signal and clock synchronization, the XPM effect can take place in both; And when signal did not exist, promptly signal was under the situation of " 0 ", and clock signal is only arranged, and the XPM effect does not take place.The waveform schematic diagram is shown in accompanying drawing 3 (a).With four road impairment signals is example, and they are on the time domain synchronously and after one tunnel clock signal effect, pass through follow-up time-delay interference device again after, can realize 3R regeneration respectively.
The optical time delay interference device also can have a lot of ways of realization, and as optical-fiber type time delay interferometer (FDI), Polarization Controller adds polarization maintaining optical fibre structure or the like.They all are based on the Mach-Zender principle of interference.From the angle of frequency spectrum, it is essentially periodic comb filter, and its cycle equals the channel spacing of incoming signal.Be spaced apart 100GHz as the incident multi channel signals, then the cycle of this comb filter also is 100GHz.As for cycle how to control this filter, need determine according to different implementations.As for FDI, the fiber lengths that can control on its two arm is poor; For the polarization maintaining optical fibre scheme, can control the length of polarization maintaining optical fibre and polarization state of incoming signal or the like.
It is emphasized that, periodically all after dates of comb filter have been determined, the present invention realizes that the key point of multichannel 3R regeneration simultaneously is accurately to adjust the peak value of each filtering channel of this comb filter, make the carrier wave of itself and every road signal that certain side-play amount be arranged, promptly each peak value of comb filter is not the center of the every road of positive alignment signal carrier.Side-play amount is between the two determined according to the amount of the XPM in device for non-linear optical.This side-play amount can not be too little, otherwise can not realize regenerating preferably; Side-play amount can not be too big, is that side-play amount is big more on the one hand, and the power of the regenerated signal of output is more little, be on the other hand when adjacent two channel spacings of original incoming signal hour, too big side-play amount can be introduced crosstalking between adjacent channel.Shown in accompanying drawing 3 (b).Solid line is the spectrum of impairment signal, and dotted line is that the filtering of FDI time-delay interference device sees through spectrum.The channel spacing of visible signal equals the comb filtering interval of FDI, but each filtering channel of FDI suitably is offset the centre wavelength of every road signal.
As device for non-linear optical, FDI 4 describes the process that 16 channel signals are regenerated simultaneously in detail below more in conjunction with the accompanying drawings as the optical time delay interference device, and experimental verification with SOA.
Incoming signal is that every channel rate is 10Gb/s, be spaced apart 16 passage non-return-to-zero (NRZ) signals of 100GHz, in order to have more general practical significance and near practical application, we carry different data messages with odd chanel and even-numbered channels, as data among the figure one and data two.After odd chanel and even-numbered channels are merged by multiplexer (AWG), behind Polarization Controller (PC), enter modulator (MZM) respectively and form light signal.After 8 road odd chanel signals and 8 tunnel even-numbered channels signals merge through a 3dB optical coupler, carry out through 52 kilometer post quasi-monomode fiber Transmit Degrades, optical attenuator (ATT) being coupled into a semiconductor optical amplifier (SOA) via a 3dB optical coupler after the processes such as power attenuation, image intensifer (EDFA) amplification introducing noise and by the optical clock signal that clock recovery device recovers.Optics adjustable delay line be used between control clock signal and 16 channel signals synchronously, make they on time domain synchronously.The spectrum of clock signal and 16 road impairment signals is shown in accompanying drawing 5 (a).In order to reach enough XPM effects, the power of clock signal should be far longer than the power of impairment signal, and the power of clock signal will make that also SOA is operated in saturation condition.Each road impairment signal only can be subjected to the XPM effect by the clock signal introducing in SOA like this, and does not have cross-gain modulation (XGM) effect of introducing between clock signal and each the road signal, and therefore the regeneration of the 3R between the different passages just can not interfere with each other.Need to prove that this situation is to select SOA as device for non-linear optical at us,, select condition of work and parameter as the case may be for other optical nonlinearity optics.
After clock signal and impairment signal entered SOA, because the XPM effect takes place, the tangible broadening of the spectrum of 16 road signals was shown in accompanying drawing 5 (b).But do not realize 3R regeneration this moment, need carry out while filtering to 16 passages, realize complete 3R regeneration by follow-up FDI.
Because incoming signal is 100GHz at interval, be 2.1 millimeters so select the fiber lengths difference on FDI two arms, make its comb filter just also equal 100GHz at interval.The two arm fiber lengths difference Δ L of FDI are determined by following formula:
Wherein C is a light propagation rate in a vacuum, and neff is the refractive index of the used optical fiber of FDI, and R is the channel spacing of incoming signal.With channel spacing in this experiment is 100GHz, and the FDI optical fibre refractivity is 1.45 for example, and can calculate FDI two arm fiber lengths differences is 2.1mm.
Control the working temperature of FDI simultaneously, making has a skew between each peak value and every road signal on its spectrum.In this experiment, according to the speed of incident optical signal, the size of luminous power and the conditions such as bias current of SOA, side-play amount is-0.25nm.Shown in accompanying drawing 5 (c), each passage of visible FDI all is offset the carrier wave of primary signal through filtered each the road spectrum of FDI, so just can realize multichannel while 3R regeneration simultaneously.Accompanying drawing 5 (d) is the spectrum enlarged drawing of one of them regenerated signal.
With the wherein paths 7 in 16 road signals is example, and accompanying drawing 6 has shown the eye pattern of primary signal, impairment signal and the regenerated signal of passage 7.Wherein (a) is primary signal, (b) is impairment signal, (c) is the signal after the regeneration.Can significantly see, through Optical Fiber Transmission, image intensifer amplify introduce noise after, the eye pattern of signal (b) has had tangible deterioration such as under the original case (a), shows that time jitter increase, pulse distortion, noise are very big or the like.But behind the multichannel 3R regenerator through the present invention's proposition, the quality of signal (c) has had tangible improvement, and time jitter reduces, and pulse has realized reformation shape.Also have a sign indicating number type transfer process with what the 3R regenerative process was followed, promptly primary signal is non-return-to-zero (NRZ) form, has become (RZ) form that makes zero after the regeneration, but the entrained information of signal is in full accord before and after regeneration.Other each passages also can be realized 3R regeneration simultaneously, repeat no more.
To 1 in this 16 road signal, 7,10,16 channel signals carry out error code testing, the result as shown in Figure 7, Fig. 7 (a) is original to 1 channel signal, deterioration, the experiment error code testing comparison diagram of regenerated signal, Fig. 7 (b) is original to 7 channel signals, deterioration, the experiment error code testing comparison diagram of regenerated signal, Fig. 7 (c) is original to 10 channel signals, deterioration, the experiment error code testing comparison diagram of regenerated signal, Fig. 7 (d) is original to 16 channel signals, deterioration, the experiment error code testing comparison diagram of regenerated signal, can see 1,7,10, the every road of 16 passages signal is through carrying out 3R regeneration again after the deterioration, improvement about 4dB all can be arranged, well verified the superperformance of the multichannel 3R regenerator in this invention.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1. multichannel complete light 3 R regenerator, it is characterized in that, comprise optical clock recovery device, device for non-linear optical and optical time delay interference device, described optical clock recovery device is used for from the transmission link the impaired light signal of multichannel and chooses one tunnel impaired light signal arbitrarily and extract synchronous optical clock signal; Multichannel primary light signal transmits in optical fiber link after merging through a multiplexer AWG, obtains the impaired light signal of multichannel; This synchronizable optical clock signal and the impaired light signal of multichannel enter single device for non-linear optical, and the power that the power of clock signal is far longer than impairment signal makes the 3R regeneration between different channels can not interfere with each other, and device for non-linear optical is used to realize the cross-phase modulation XPM effect between optical clock signal and the impaired light signal of multichannel; Realize that through device for non-linear optical the multipath light signal that cross-phase modulation XPM effect is produced enters described optical time delay interference device, described optical time delay interference device is a comb filter, be used for leaching the specific part of warbling that every road light signal spectrum after the XPM effect takes place, the signal section of filtering noise and deterioration generates multichannel reproduced light signal simultaneously.
2. multichannel complete light 3 R regenerator according to claim 1 is characterized in that the frequency interval of described comb filter equals the channel spacing of incident multiple signals.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436907B (en) * | 2008-12-15 | 2012-05-09 | 电子科技大学 | Device and method for extracting light clock |
| CN101695011B (en) * | 2009-10-28 | 2012-11-21 | 天津大学 | Method and device for high-speed multi-channel all-optical 3R regeneration |
| CN102130739B (en) * | 2010-12-31 | 2014-02-19 | 华为技术有限公司 | Device and method for regenerating signals |
| CN102185657A (en) * | 2011-04-18 | 2011-09-14 | 电子科技大学 | Full-optical 3R regeneration device based on magnetically controlled optical fiber parameter oscillator |
| CN102305985B (en) * | 2011-08-31 | 2013-02-06 | 山西大同大学 | Method and device for all-optical regeneration of high-speed differential quadrature reference phase shift keying (DQPSK) modulation 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 |
| CN104317139B (en) * | 2014-11-25 | 2017-03-29 | 电子科技大学 | A kind of multi-wavelength all-optical 3R regeneration device based on magnetic control Fiber-optic parameter agitator |
| CN104639258A (en) * | 2015-02-06 | 2015-05-20 | 电子科技大学 | Parameter multicast photon channelized radio-frequency receiver |
| CN105490748B (en) * | 2015-11-25 | 2018-01-12 | 电子科技大学 | A kind of multi-wavelength all-optical regeneration device based on code conversion |
| CN107579777B (en) * | 2017-08-14 | 2019-09-24 | 电子科技大学 | A kind of full light regenerator self-reacting device |
| CN109217921B (en) * | 2018-08-24 | 2021-10-12 | 武汉恒泰通技术有限公司 | Error code testing device and testing method thereof |
| WO2023170863A1 (en) * | 2022-03-10 | 2023-09-14 | 日本電信電話株式会社 | Leakage light analyzing device and method |
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