CN101695011A - Method and device for high-speed multi-channel all-optical 3R regeneration - Google Patents
Method and device for high-speed multi-channel all-optical 3R regeneration Download PDFInfo
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Abstract
The invention relates to a method and a device for high-speed multi-channel all-optical 3R regeneration. The device comprises an all-optical multi-wavelength shifter, a multi-wavelength clock extraction unit, a polarization orthogonal unit and a multi-wavelength decision device. The method comprises the following steps: a multipath degraded optical signal in a transmission link enters into the multi-wavelength shifter, and a multipath optical signal subjected to wavelength conversion enters into the multi-wavelength clock extraction unit to extract a multipath optical clock signal and is processed by polarization orthogonality; the degraded signal subjected to the polarization orthogonality and the relevant extracted clock enter into an all-optical multi-wavelength decision unit simultaneously, and in the unit, an optical clock respectively carries out parametric process with relevant degraded signals to perform all-optical decision regeneration. The invention is not limited by the rate of the optical signal, can directly regenerate a wavelength-division multiplex signal in the device and have no need of synthesizing each path of signal after regeneration. In addition, the regeneration device mainly consists of passive devices, has simple structure and low cost and overcomes the defects of complex structure, high cost, and the like in the traditional multi-channel regeneration system.
Description
[technical field]: the present invention relates to high-speed high capacity all-optical network communication technical field, be specifically related to high-speed multi-channel all-optical 3 R regeneration techniques and device.
[technical background]: in all-optical network, the full light 3R regeneration (Reamplification, Reshaping, Retiming) of signal is a key issue that needs to be resolved hurrily.Because the factors such as ASE noise of the interference of chromatic dispersion, WDM interchannel, nonlinear effect, light source and the image intensifer of system all inevitably cause the deterioration of signal in the network, especially in 40Gb/s and above ultra high-speed optical network, this deterioration be can not ignore especially to the influence of signal.The characteristic of following optical-fiber network dynamic flexible has determined the uncertainty of the transmission path of signal again, therefore can not take the scheme of fixed compensation to the recovery of signal, and must carry out 3R regeneration to signal.
But at present the research that signal is carried out the 3R regeneration techniques concentrates in single wavelength system, and the full light 3R of the single wavelength regeneration scheme of 40Gb/s has had many reports in the world, and domestic University Of Tianjin and Tsing-Hua University have also all finished system experimentation.But the full light 3R of single wavelength system is in a kind of awkward stage at present: 1, single channel speed is in the following system of 40Gb/s, and full photo reversal is compared with the OEO scheme on performance still is cost does not all have advantage to say.2, in system cost, all there is very big problem greater than the system more than the 40Gb/s in single channel speed in the optical signal transmission, is difficult to and the wdm system competition, is difficult to practicability in the recent period, and therefore, the demand of single wavelength light 3R regeneration techniques is not very urgent.
Here need to particularly point out, the essential distinction of the optical signal transmission and the signal of telecommunication is in the optical-fiber network: light is owing to adopted wavelength division multiplexing (WDM) technology can the multidiameter delay transmission, and electricity can only be the single channel serial transmission.This also is the sharpest edges place of optical signal transmission than signal of telecommunication transmission.As above-mentioned, although in the system below 40Gbit/s, the 3R technology of electricity will be more than low, the good reliability of 3R technical costs of full light.But for the wdm system that extensively adopts in the present optical transmission system, because the limitation of electric treatment mechanism adopts the mode of electricity to regenerate respectively to each wavelength respectively, the advantage of its cost, reliability is offset greatly with the increase of number of wavelengths.And from the essence of light, can in same system, carry out 3R regeneration simultaneously in theory to a plurality of wavelength, this be electricity the 3R technology can't reach.So the full light 3R of the multi-wavelength technology that only can be used in wdm system just may be given full play to full optical tech advantage.
Review history, the rapid commercialization of WDM technology has benefited from the maturation of erbium-doped fiber amplifier (EDFA) technology, has realized a phase step type development of optical communication system capacity.Develop so far, present WDM technology can while multiplexing roads up to a hundred wavelength optical signals flow on single fiber, has made full use of the communication window of monomode fiber, has realized the transmission capacity of Tb/s magnitude in single fiber.We can say that the appearance of EDFA just makes WDM technology become the most fast telecommunication transmission technology of development.
Historical often surprising similar, the breakthrough of the full light 3R of multi-wavelength regeneration techniques will bring the development of the property changed again for the application of WDM technology in the optical-fiber network of a new generation, for the two-forty broadband light network that future is novel is laid the good technical basis.
Up to now, the system research of the full photo reversal of multi-wavelength still mainly rests in the 2R regeneration.For example the researcher of Denmark utilizes nonlinear optical fiber annular mirror (NOLM) and non-equilibrium dispersive optical fiber annular mirror (DILM) to realize the full light 2R regeneration of multi-wavelength.
The system experimentation of 3R and scheme are also seldom.The researcher of BeiJing, China's University of Post and Telecommunication has proposed the system block diagram structure of a full light 3R of multi-wavelength, proposed to utilize tunable Fiber Bragg Grating FBG (FBG) that the Signal Regulation of multi-wavelength is synchronous, thereby only need recover single clock and the signal of multichannel different wave length is regenerated simultaneously, this scheme can reduce the realization difficulty of the full light 3R of multi-wavelength system.But this article has only provided the frame structure of system, and the specific implementation method that Clock Extraction and single clock are adjudicated multiple signals further is not discussed, and need also greatly reduce the practicality of this scheme to multiple signals synchronously.The researcher of Princeton university then utilizes terahertz optics asymmetric demultiplexer (TOAD) the WDM signal of multichannel different wave length is gone here and there and to change, high-speed serial signals carries out full photo reversal then, but multi-wavelength signals must carry out time division multiplexing again through the sequential adjustment, remain the 3R regeneration of one-channel signal from the time, can not realize the multiple wavelength optical signal 3R regeneration simultaneously on the complete meaning.And the signal that this means each wavelength must have identical clock signal, and the clock in the existing packet network between different user is separate, can not realize precise synchronization.So this scheme also is not suitable for existing multiple source network.
[summary of the invention]: the present invention seeks to solve problems such as the system complex that exists in the present realization multi-channel all-optical 3 R regeneration scheme, cost height, poor stability, a kind of high-speed multi-channel all-optical 3 R renovation process and device are provided, realize the simultaneously full light 3R regeneration of multichannel truly.
For solving the problems of the technologies described above, the present invention proposes a kind of high-speed multi-channel all-optical 3 R renovation process, realize as follows:
The first, provide continuous light as pump light by local light source;
The second, with local reception to multichannel worsen light signal and be divided into two-way, wherein one the tunnel carries out wavelength conversion with above-mentioned continuous light, the information that multichannel is worsened light signal is transferred to new wavelength place respectively;
Three, second step was injected in the multi-wavelength Clock Extraction unit Clock Extraction when realizing multiple signals together through the multiple signals of wavelength conversion;
Four, in order to reduce the phase mutual interference between multiple signals and the multipath clock, before full light judgement, multichannel deterioration light signal and corresponding multipath clock are carried out preliminary treatment respectively, change the polarization state of signal and clock between the adjacency channel, make the polarization state quadrature of signal and clock between the adjacency channel.
Five, pretreated multichannel is worsened light signal and corresponding multipath clock injects the multi-wavelength decision unit jointly, in the multi-wavelength decision unit each road worsen light signal respectively with corresponding clock effect, obtain the regenerated signal after the shaping.
A kind of device of realizing above-mentioned high-speed multi-channel all-optical 3 R renovation process comprises:
Coupler: the multichannel that is used for receiving worsens light signal and is divided into two-way, and one the tunnel is used for carrying out Clock Extraction to obtain the timer clock of low jitter, and another road is worsened light signal as original multichannel and carried out the preliminary treatment of adjacent signals polarization state quadrature;
Tunable light source: be connected with the multi-wavelength converter, produce high stable, narrow-linewidth laser, for wavelength conversion provides pump light;
The multi-wavelength converter: be connected with an end of coupler, wherein one tunnel multichannel that is used for that coupler is told worsens the information transfer of light signal to the multi-wavelength continuous light;
Multi-wavelength Clock Extraction unit: be connected with the output of multi-wavelength converter, be used for extracting simultaneously the multipath clock information that multichannel worsens the light signal correspondence; Described multi-wavelength Clock Extraction unit adopts passive comb filter to realize that the free spectral range of passive comb filter equals the bit rate of each road transmitting optical signal.
The first polarized orthogonal unit: be connected with the output of Clock Extraction unit, be used for changing respectively the polarization state of signal and clock between the adjacency channel, make the polarization state quadrature of adjacent two-way clock;
The second polarized orthogonal unit: be connected with the other end of coupler, be used to change the wherein polarization state of another road multichannel deterioration light signal that coupler is told, make the polarization state quadrature of adjacent two ways of optical signals;
Multi-wavelength decision device: connect first, second polarized orthogonal unit respectively, be used for full light judgement and output between multichannel deterioration signal and the multipath clock.The realization of the full light judgement of described multi-wavelength decision device is that each road deterioration light signal is adjudicated with corresponding clock signal own respectively, but not adjudicates with one tunnel clock signal and a plurality of deterioration signal.
Advantage of the present invention and meaning: 1, scheme simple economy practicality, crucial processing unit mostly is passive device, and is simple in structure.2, when port number increases, the complexity of system can not improve.3, the service behaviour of core working cell does not descend because of the increase of port number in the system.
[description of drawings]
Fig. 1 is the general structure schematic diagram of 3R regenerating unit of the present invention;
Fig. 2 a and Fig. 2 b are multi-wavelength converter work schematic diagram among the present invention;
Fig. 3 a to Fig. 3 d is multi-wavelength Clock Extraction schematic diagram among the present invention;
Fig. 4 is polarized orthogonal preliminary treatment schematic diagram among the present invention;
Fig. 5 a and Fig. 5 b are the full light judgement of multi-wavelength among the present invention schematic diagram.
[specific implementation method]:
Now in conjunction with the accompanying drawings the full light 3R of multi-wavelength regenerative process is elaborated.
Overall implementation is seen Fig. 1:
High speed multi-channel all-optical 3 R renovation process of the present invention and device, it comprises full light multi-wavelength converter, multi-wavelength Clock Extraction unit, polarized orthogonal unit, multi-wavelength decision device.From the next multi-wavelength signals of wdm system transmission, because the severe exacerbation that multistage amplification in the transmission and chromatic dispersion cause signal, in this regenerating unit, at first light signal is divided into two-way through coupler, wherein the first via is used for carrying out Clock Extraction obtaining the timer clock of low jitter, and the second the tunnel carries out the preliminary treatment of adjacent signals polarization state quadrature as original deterioration light signal, sees Fig. 4, enter the multi-wavelength decision device then, see Fig. 5 a and Fig. 5 b.The signal of the first via, extract clock for ease of multi-wavelength Clock Extraction unit, at first carry out the multi-wavelength conversion, with the wavelength location of WDM signal transformation to regulation, see Fig. 2 a and Fig. 2 b, signal behind the wavelength conversion just can be smoothly through comb filter filtering, extract the clock of each signal in the WDM signal, see Fig. 3 a, Fig. 3 b, Fig. 3 c, and then Fig. 3 d carries out the preliminary treatment of polarization state quadrature to the multipath clock that extracts, see Fig. 4, make the polarization state quadrature of adjacent two-way clock, last clock is injected in the multi-wavelength decision device jointly with same pretreated deterioration light signal, sees Fig. 5 a and Fig. 5 b, realizes that finally the full light 3R of multi-wavelength regenerates simultaneously.
The multi-wavelength converter is seen Fig. 2 a and Fig. 2 b:
Core cell in this multi-wavelength converting means be have nonlinear characteristic optical fiber or and fiber waveguide device, Fiber-based Optical Parametric Amplifiers OPA for example, periodic polarized lithium niobate PPLN etc. has all devices of nonlinear effect.In the multi-wavelength converter, with high-power local continuous light is pump light, after multi-wavelength signals enters nonlinear device, because stronger nonlinear effect, cause to occur at the opposite side that with the continuous light wavelength is the center flashlight of new frequency, and wavelength location is at the beat frequency place of input signal light and pump light, the modulation intelligence of flashlight can appear on the light wave of corresponding new frequency like this, and the new optical wavelength that produces changes with the change of pump light wavelength, therefore can multi-wavelength signals be transformed to required wavelength place by this scheme.Owing in a device, realize the wavelength conversion of a plurality of signals simultaneously, simple on the structure on the one hand, do not need the signal of each wavelength is carried out wavelength conversion respectively and makes up a plurality of wavelength shifters, on the other hand to the treatment effeciency height of multi-wavelength signals, can not introduce extra interference and deterioration because of complex structure, most importantly be implemented as lowly, be easy to extensive use.
Fig. 3 is seen in multi-wavelength Clock Extraction unit:
Core cell in this multi-wavelength clock extracting apparatus is the filtering device with pectination window, for example device such as F-P filter, polarization correlation interferometer.Utilize comb filter that clock signal is extracted in light pulse and must satisfy two conditions: free spectrum sector width FSR will be complementary with the list entries bit rate, and a transmission window center of filter will accurately be aimed at the centre carrier frequency of list entries.As long as the wavelength interval of multi-wavelength signals is the integral multiple of free spectral range, just can extract the clock of multi-wavelength signals simultaneously.The fineness of comb filter and passband width close
(fineness is a fineness, and FSR is the free spectral range, and FWHM is the transmission window full width at half maximum), when fineness is 1000, when the free spectral range was 40GHz, passband width was 40MHz, say on the principle that fineness is high more, passband width is more little, and the clock jitter that obtains is more little; If but the comb filter fineness is too high, such as fineness is 10000, and when the free spectral range was 40GHz, passband width only was 4MHz, when the FSR difference of the clock frequency of input optical signal and comb filter during, just can't extract clock information greater than passband width.Therefore,, both can obtain light time clock information, can allow to have between the input optical signal certain frequency difference again than low jitter by selecting the comb filter of suitable fineness.
Fig. 4 is seen in the preliminary treatment of polarization state quadrature:
Core cell is the birefringence device in this polarization state quadrature device, birefringence fiber for example, and SOA etc. have all devices of birefringent characteristic.Before multi-wavelength signals enters the birefringence device, at first will be through a Polarization Controller PC, to guarantee that multi-wavelength signals has identical polarization state, like this, multi-wavelength signals enters after the birefringence device, and the polarization state anglec of rotation difference of different wave length signal will make the polarization state quadrature of adjacency channel, the phase difference that then will make the component of two-way light wave on fast and slow axis is π+2k π (k is an integer), must meet relational expression
(Δ f is a channel spacing, A τ
DGDBe differential group delay), therefore according to the wavelength interval of multi-wavelength signals, as long as select the birefringence device of regulation differential group delay parameter, can guarantee that the identical multi-wavelength signals of polarization state after through the birefringence device, makes the polarization state quadrature between the adjacent channel.
The full light decision device of multi-wavelength is seen Fig. 5:
Core cell is one to have the device of high non-linearity in this multi-wavelength judgment device, for example highly nonlinear optical fiber HNLF, etc. passive device.The front after polarized orthogonal is handled the deterioration light signal and after clock light injects the multi-wavelength decision device jointly, because nonlinear effect causes parametric process, produce two decision window respectively in the both sides of pump light, and corresponding to signal light wavelength and ideler frequency optical wavelength position.Because the multi-wavelength signals after just can obtaining regenerating by narrow band filter or Wave decomposing multiplexer respective signal light wave strong point like this.
Claims (4)
1. a high-speed multi-channel all-optical 3 R renovation process is characterized in that, this method realizes as follows:
The first, provide continuous light as pump light by local light source;
The second, with local reception to multichannel worsen light signal and be divided into two-way, wherein one the tunnel carries out wavelength conversion with above-mentioned continuous light, the information that multichannel is worsened light signal is transferred to new wavelength place respectively;
Three, second step was injected in the multi-wavelength Clock Extraction unit Clock Extraction when realizing multiple signals together through the multiple signals of wavelength conversion;
Four, in order to reduce the phase mutual interference between multiple signals and the multipath clock, before full light judgement, multichannel deterioration light signal and corresponding multipath clock are carried out preliminary treatment respectively, change the polarization state of signal and clock between the adjacency channel, make the polarization state quadrature of signal and clock between the adjacency channel.
Five, pretreated multichannel is worsened light signal and corresponding multipath clock injects the multi-wavelength decision unit jointly, light signal is worsened respectively simultaneously and corresponding clock effect in each road in the multi-wavelength decision unit, obtains the regenerated signal after the shaping.
2. device of realizing the described method of claim 1 is characterized in that this device comprises:
Coupler: the multichannel that is used for receiving worsens light signal and is divided into two-way, and one the tunnel is used for carrying out Clock Extraction to obtain the timer clock of low jitter, and another road is worsened light signal as original multichannel and carried out the preliminary treatment of adjacent signals polarization state quadrature;
Wavelength tunable light source: be connected with the multi-wavelength converter, produce high stable, narrow-linewidth laser, for wavelength conversion provides pump light;
The multi-wavelength converter: be connected with an end and the tunable optical source of coupler, wherein one tunnel multichannel that is used for that coupler is told worsens the wavelength location of the information transfer of light signal to new generation;
Multi-wavelength Clock Extraction unit: be connected with the output of multi-wavelength converter, be used for extracting simultaneously the multipath clock information that multichannel worsens the light signal correspondence;
The first polarized orthogonal unit: be connected with the output of multi-wavelength Clock Extraction unit, be used for changing respectively the polarization state of signal and clock between the adjacency channel, make the polarization state quadrature of adjacent two-way clock;
The second polarized orthogonal unit: be connected with the other end of coupler, be used to change the wherein polarization state of another road multichannel deterioration light signal that coupler is told, make the polarization state quadrature of adjacent two ways of optical signals;
Multi-wavelength decision device: connect first, second polarized orthogonal unit respectively, be used for full light judgement and output between multichannel deterioration light signal and the multipath clock.
3. device according to claim 2 is characterized in that, described multi-wavelength Clock Extraction unit adopts comb filter to realize that the free spectral range of passive comb filter equals the bit rate of each road transmitting optical signal.
4. according to claim 2 or 3 described devices, it is characterized in that, the realization of the full light of described multi-wavelength judgement be each road worsen light signal respectively simultaneously and corresponding clock signal adjudicate, but not adjudicate with one tunnel clock signal and a plurality of deterioration signal.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN102520559A (en) * | 2011-12-20 | 2012-06-27 | 天津大学 | Method for generating arbitrary waveforms on basis of optical injection locking |
| CN103780308A (en) * | 2014-01-13 | 2014-05-07 | 电子科技大学 | Multi-wavelength all-optical regenerative device capable of inhibiting crosstalk and method thereof |
| CN105490748A (en) * | 2015-11-25 | 2016-04-13 | 电子科技大学 | Multi-wavelength all-optical regeneration device based on code type conversion |
| CN105553558A (en) * | 2015-12-16 | 2016-05-04 | 电子科技大学 | Multifunctional device for improving quality of optical signals |
| CN107579777A (en) * | 2017-08-14 | 2018-01-12 | 电子科技大学 | A kind of full light regenerator self-reacting device |
| CN110050417A (en) * | 2017-01-24 | 2019-07-23 | 华为技术有限公司 | Reduce the synchronous error in common public radio interface (CPRI) passive optical network (PON) |
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| CN112187370A (en) * | 2020-10-28 | 2021-01-05 | 上海交通大学 | Balanced demodulator based on intelligent all-optical decision and demodulation method thereof |
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| 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 |
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| CN103780308A (en) * | 2014-01-13 | 2014-05-07 | 电子科技大学 | Multi-wavelength all-optical regenerative device capable of inhibiting crosstalk and method thereof |
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| CN107579777A (en) * | 2017-08-14 | 2018-01-12 | 电子科技大学 | A kind of full light regenerator self-reacting device |
| CN107579777B (en) * | 2017-08-14 | 2019-09-24 | 电子科技大学 | A kind of full light regenerator self-reacting device |
| WO2019174117A1 (en) * | 2018-03-15 | 2019-09-19 | 电子科技大学 | Flexibly adjustable multi-level all-optical 2r regeneration apparatus |
| WO2022068711A1 (en) * | 2020-09-30 | 2022-04-07 | 华为技术有限公司 | Optical amplification device and multi-port wavelength division multiplexing coupler |
| CN112187370A (en) * | 2020-10-28 | 2021-01-05 | 上海交通大学 | Balanced demodulator based on intelligent all-optical decision and demodulation method thereof |
| CN112187370B (en) * | 2020-10-28 | 2021-11-05 | 上海交通大学 | Balanced demodulator based on intelligent all-optical decision and demodulation method thereof |
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