CN1265576C - Apparatus and method for in-line dispersion compensating of mixing rate system - Google Patents
Apparatus and method for in-line dispersion compensating of mixing rate system Download PDFInfo
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- CN1265576C CN1265576C CNB021441170A CN02144117A CN1265576C CN 1265576 C CN1265576 C CN 1265576C CN B021441170 A CNB021441170 A CN B021441170A CN 02144117 A CN02144117 A CN 02144117A CN 1265576 C CN1265576 C CN 1265576C
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Abstract
The present invention relates to a transmission method for mixing rate light, particularly to an apparatus and a method for on-line dispersion compensating of a mixing rate system. The present invention comprises at least a dispersion compensator, at least a circulator and a combiner, wherein each level circulator is connected with one dispersion compensator, the dispersion compensator is connected with the next level circulator, and all circulator and the last level dispersion compensator are respectively connected with the combiner, and thereby, a compensating link circuit is formed. The present invention can make the on-line dispersion compensation on a single optical signal or a plurality of different rates of optical signals without a multiplexer/demultiplexer. The present invention can be flexibly configured and upgraded according to the system requirement and is suitable for waveguide integrative manufacturing in future. The present invention is especially suitable for optical path connection or optical path joints among OXC, OADM, OTM and transmits a few of ring type metro or WDM systems of a mixing rate service.
Description
Affiliated technical field
The present invention relates to the transmission of mixing rate light, particularly the online dispersion compensation device and the method for mixing rate system.The present invention is used for solving the dispersion compensation of metropolitan area network, dense wave division multipurpose (DWDM) optical transmission system, intelligent optical network system 2.5G/10G/40G mixing rate optical transmission.The light path that the present invention is specially adapted between optical cross connect system (OXC), Optical Add/Drop Multiplexer (OADM), the Optical Terminal Multiplexer (OTM) connects or the light path node, transmits the ring-like Metro or wavelength division multiplexing (WDM) system of a few mixing rate business.
Background technology
In optical fiber telecommunications system, the focus and the difficult point of the mixing rate light signal transmission in same optical fiber becoming network struction, and wherein the solution of dispersion compensation is the key technology that realizes the mixing rate optical transmission.The system dispersion tolerance limit of different rates light signal differs very big, the relation of system dispersion tolerance value and rate value is not linear, but square relation, for example be upgraded to the words of 10G from 2.5G when system, the system dispersion tolerance limit requires and can improve 16 times, and is as shown in table 1, and this brings very big difficulty for the integrated solution of dispersion compensation of mixing rate optical transmission system, particularly when the 40G light signal also joined the mixed transport of optical-fiber network, this requirement meeting was higher.
Table 1 different rates dispersion limited non-relay apart from theoretical value:
| 1550nm(G.652) | 1550nm(G.655) | |
| 2.5Gbit/s | 929km | 4528km |
| 10Gbit/s | 58km | 283km |
| 40Gbit/s | 3.6km | 18km |
In the different rates optical transmission system, its dispersion compensation schemes has nothing in common with each other at present.For the 2.5G system,, generally in system, need not carry out dispersion compensation because its dispersion tolerance is very big; For the 10G system, because its dispersion tolerance is less, generally, transmission range will take into account the diffusing compensation of the circumstances in which people get things ready for a trip when surpassing 60km, dispersion compensation schemes commonly used has dispersion compensating fiber (broadband system) and Dispersion Compensation Grating (single-channel system); For the 40G system, because its dispersion tolerance is minimum, in system, to carry out fine compensation, because optical fiber dispersion also will carry out online dynamic dispersion compensation sometimes with variation of temperature with Tunable Dispersion Compensator.
How the light signal of different rates in the same optical fiber being carried out incorporate dispersion compensation in ASON, Metro and DWDM is the problem that we will solve.
Present metropolitan area network, basically also do not introduce the 40G business in the dwdm system, the dispersion compensation solution of current 2.5G/10G mixed transport generally is to adopt broadband DCF (dispersion compensating fiber) to carry out dispersion compensation piecemeal, promptly adopt general DCF module simultaneously 10G and 2.5G signal to be compensated, this kind method is added in DCF making a start of optical sender usually, on the receiving end of optical receiver or the optical relay website, the work zone of DCF is roomy, can realize broadband compensation, device is to temperature-insensitive, require looser for condition of work, the technology maturity height is applicable to Metro or dwdm system that wave number is more.
Shortcoming and the limitation that adopts DCF to carry out the mixing rate dispersion compensation is at present:
If the 10G service wavelength is less in 1 network, then every dispersion compensation of channels cost is very high, current DCF all relies on import, the DCF module price of a compensation 80km is about 7000 dollars, consider that the tax rate is equivalent to about 70000$, and corresponding D CG (Dispersion Compensation Grating) price is lower than 5000$, that is to say, has only that to adopt DCF to be only when above worthwhile when the 10G business in the network reaches tens wavelength.
2, DCF module general requirements is DCM20,40,60,80 etc. (DCM20 represents to compensate 20km optical fiber), and for example 35km often can't fine compensation for actual fiber length, and the repeatedly accumulation of this residual dispersion can cause the reception cost of high-speed optical signal.
3, the loss of DCF introducing is too big, and system has been introduced bigger nonlinear effect and polarization mode dispersion.And DCF has introduced unnecessary dispersion compensation loss for the 2.5G business, thereby has increased the spending of the preceding preseting amplifier of receiver, and has introduced DCF noise and extra amplifier noise.
If 4 have introduced the business of 40G, also to carry out deciliter ripple and adjustable dispersion compensating at 40G in addition, system configuration must be changed.
Another kind of scheme is to adopt DCG to carry out dispersion compensation, usual way is that the 10G signal is got off with the channel-splitting filter branch, the light signal after the compensation adds a circulator with a DCG and carries out dispersion compensation, if also will continue to transmit to be incorporated in the light path with wave multiplexer to go again.DCG generally can only compensate single ripple, and its Insertion Loss is little, and nonlinear effect is not obvious, and the technology comparative maturity is commonly used in high speed (10G and the above speed) SDH optical transmission of single ripple.
The shortcoming of current general DCG dispersion compensation method is to carry out online dispersion compensation to certain wavelength in the system, if specific wavelength is carried out dispersion compensation, need to use Optical Add/Drop Multiplexer (OADM) or demodulation multiplexer (DEMUX) down with this wavelength filter, send into and carry out dispersion compensation among the DCG, be incorporated in the Transmission Fibers by OADM or MUX more then, the upper and lower road of this wavelength will increase the Insertion Loss and the cost of system, if and system configuration is changed or upgrading, these multiplexer/demultiplexer spares also will be changed thereupon.
The dispersion compensation technology of prechirp and decision-feedback is not mature enough, and big limitation is arranged, and another relatively more expensive method is to adopt electric relaying, and signal is carried out 3R regeneration.
Summary of the invention
The online dispersion compensation device and the method that the purpose of this invention is to provide a kind of mixing rate system, making does not need can carry out online dispersion compensation simultaneously to the light signal of different rates grade in the optical fiber through deciliter ripple, the light signal of each speed grade that is compensated can be one or more, this can be according to system requirements flexible configuration and upgrading, and is applicable to and carries out the integrated manufacturing of waveguide in the future.
The present invention includes at least one dispersion compensator, it also comprises at least one circulator and a mixer; Each grade circulator is connected with a dispersion compensator, and described dispersion compensator is connected with the next stage circulator, and all circulators are connected with mixer respectively with the dispersion compensator of afterbody, constitutes the compensation link.
Above-mentioned dispersion compensator is Dispersion Compensation Grating or Tunable Dispersion Compensator, and Tunable Dispersion Compensator is made by chirped fiber grating.Circulator can replace with coupler, and described coupler is 2 * 2 couplers or 1 * 2 coupler, and described mixer can be coupler or wave multiplexer.
The online dispersion compensation device of mixing rate of the present invention system can be to be that separate unit or this separate unit superpose and constitute the online dispersion compensation device with m circulator, n dispersion compensator according to above-mentioned connected mode, broadband signal is carried out the dispersion compensation of while.
The compensation method of the online dispersion compensation device of mixing rate of the present invention system is through following step:
1) the mixing rate light signal is introduced into first order circulator, through first order dispersion compensator, finish the dispersion compensation of first kind of light signal after, the light signal of described speed continues to enter mixer through first order circulator;
2) light signal of other speed sees through the upper level dispersion compensator and enters the next stage circulator, and alternative light signal enters mixer through described next stage circulator after the next stage dispersion compensator is finished dispersion compensation;
3) Yu Xia light signal repeating step 2), all finish dispersion compensation up to all light signals;
4) all light signals return in the optical fiber through mixer.
Above-mentioned dispersion compensator is Dispersion Compensation Grating or Tunable Dispersion Compensator, and Tunable Dispersion Compensator is made by chirped fiber grating.Circulator can replace with coupler, and described coupler is 2 * 2 couplers or 1 * 2 coupler, and described mixer can be coupler or wave multiplexer.
The present invention and DCF dispersion compensation and simple DCG light path up and down carry out dispersion compensation and compare, and are characterized in:
What 1, Metro and wdm system transmitted is the mixed service of different rates (2.5G, 10G even 40G), and the used wavelength of high speed business is not a lot.ASON, Metro, wdm system for the mixing high speed business that hangs down port number can provide online cheaply dispersion compensation schemes, and the Insertion Loss of introducing is little, the dispersion measure that can compensate is accurate, also little many of amplifier cost, nonlinear effect, the PMD that introduces to system.That is to say, the present invention can carry out online dispersion compensation to the mixing rate system, the signal branch of various speed in the optical fiber need not be got off and just can carry out dispersion compensation to them respectively, reduce the partial wave of photosphere signal and the process of closing ripple, reduce system cost.And this module can be carried out flexible configuration according to the number of signals in the light path, when system upgrade, only needn't change system configuration with changing module.
2, need not can compensate by OADM or MUX/DEMUX filtering for single channel or broadband chromatic dispersion compensation;
3, the present invention is applicable to wavelength-division multiplex system or the design of integrated waveguide dispersion compensation structure, and the potential prospect of high-performance, low cost, high integration is arranged.
Description of drawings
Fig. 1 is the basic light channel structure schematic diagram of module that the present invention compensates a 40G signal, a 10G signal and a plurality of 2.5G signals.
Fig. 2 is the module light channel structure schematic diagram that the present invention compensates a 40G signal, a n-1 10G signal and a plurality of 2.5G signals.
Fig. 3 is the online dispersion compensation module structural representation that utilizes the 40G/10G/2.5G signal of 2 * 2 couplers.
Fig. 4 is the application schematic diagram of the present invention in ASON.
Fig. 5 is the application schematic diagram of the present invention in WDM.
Embodiment
The present invention is described in detail as follows in conjunction with the embodiments with reference to accompanying drawing:
As shown in Figure 1, the workflow of described dispersion compensation module is: the mixing rate signal enters circulator 1 from optical fiber, then change TDC (Tunable Dispersion Compensator) over to, it is to be made by chirped fiber grating, its centre wavelength is aimed at the 40G light signal, 40G light signal dispersion compensating back reflection comes out, and continue to enter coupler through circulator 1, and other signal enters circulator 2 through TDC.The 10G signal of need dispersion compensation returns circulator 2 and enters coupler in the remaining mixed signal after the DCG compensation, remaining 2.5G signal sees through DCG and enters coupler, and then 40G, 10G, 2.5G signal all enter coupler again after through compensation link separately and return in the optical fiber at last.
The decay of this module is very little, decay to 0.4～0.5dB between the circulator port, the decay of dispersion compensator such as TDC, DCG is less than 1dB, and the decay of coupler is also less than 1dB, and then the decay of whole module is about about 3dB, the light path of the 40G signal process of compensation is short earlier, it is little to decay, and is about 2dB, and the light path of 2.5G signal process is the longest, it is bigger to decay, and is about 4dB.That is to say, the decay difference of different rates signal, but because the signal of various speed finally is a branch comes and detect separately, so the power unevenness between them can not exert an influence to receptivity.
This module can be carried out flexible configuration to structure according to the light path number that will compensate, and can compensate a plurality of 40G signals, 10G signal or 2.5G signal, the structure of module such as Fig. 2.Structure as shown in Figure 2 can compensate a 40G signal, a n-1 10G signal, and a plurality of 2.5G signal, so analogizes, and also can be designed as m 40G signal of compensation, a n 10G signal, and p 2.5G signal.But the total channel number of compensation is not too many, and one comes multi-stage annular device structure can cause that decay increases, and two can cause the power unevenness between the same rate signal, bring influence if receiving terminal adopts the PD array to receive unavoidably simultaneously to reception.Simultaneously, according to the total channel number that is compensated, can coupler be replaced with wave multiplexers such as Arrayed Waveguide Grating (AWG), film filter according to the consideration of price, aspect of performance.
For further reducing cost, the circulator in the module can replace with 3dB 2 * 2 couplers, and the price of circulator is about 4～500 dollars, and the price of 2 * 2 couplers is about 100 RMB.Structure as shown in Figure 3, Fig. 3: the online dispersion compensating block structure that utilizes the 40G/10G/2.5G signal of 2 * 2 couplers.
The advantage of this structure is that cost is low, and shortcoming is that the decay of introducing will increase greatly.A decay of having a try is probably for about 7dB in a 3dB2 * 2 couplers for reflected light path to be compensated, and remaining decay that sees through signal also has about 3.5dB, and then for the described module of Fig. 3, it decays to 9～11dB.If want to utilize 2 * 2 couplers to realize the described multichannel dispersion compensator of Fig. 2, scheme can realize, but the low speed light signal is difficult to accept to system through the decay of being introduced behind which floor 2 * 2 coupler in the module.So this scheme with 2 * 2 couplers relatively is applicable to single 40G, 10G and a plurality of 2.5G signal are carried out online dispersion compensation.
Also available 1 * 2 coupler of circulator in the module replaces, and effect is identical with 2 * 2 couplers.
Circulator, DCG, 2 * 2 couplers, 1 * 2 coupler used in the technical program all are general ripe devices, and price is very low; TDC has manufacturers such as OFS, Teraxion to provide at present, and the principle that its chromatic dispersion compensation quantity is adjustable is to utilize the dispersion measure of the variation change chirped fiber grating of temperature gradient, and is fine to the accurate regulating effect of the chromatic dispersion of 40G signal.
This dispersion compensation module can be used for current Metro series of products, WDM series of products and next step ASON product.The usage example of this dispersion compensation schemes in ASON: the application of dispersion compensation module as shown in Figure 4 in ASON, and the application of dispersion compensation module in WDM as shown in Figure 5.
Claims (10)
1, the online dispersion compensation device of a kind of mixing rate system comprises at least one dispersion compensator, it is characterized in that it also comprises at least one circulator and a mixer; Each grade circulator is connected with a dispersion compensator, and described dispersion compensator is connected with the next stage circulator, and all circulators are connected with mixer respectively with the dispersion compensator of afterbody, constitutes the compensation link.
2,, it is characterized in that described mixer can be coupler or wave multiplexer according to the online dispersion compensation device of the described mixing rate of claim 1 system.
3,, it is characterized in that described dispersion compensator is by Dispersion Compensation Grating according to the online dispersion compensation device of the described mixing rate of claim 1 system.
4,, it is characterized in that described dispersion compensator made by chirped fiber grating according to the online dispersion compensation device of the described mixing rate of claim 1 system.
5, the online dispersion compensation device of a kind of mixing rate system comprises at least one dispersion compensator, it is characterized in that it also comprises at least one coupler and a mixer; Each grade coupled device is connected with a dispersion compensator, and described dispersion compensator is connected with the next stage coupler, and all couplers are connected with mixer respectively with the dispersion compensator of afterbody, constitutes the compensation link.
6,, it is characterized in that described coupler is 2 * 2 couplers or 1 * 2 coupler according to the online dispersion compensation device of the described mixing rate of claim 5 system.
7, the compensation method of device according to claim 1 is characterized in that it is through following step:
(1) the mixing rate light signal is introduced into first order circulator, through first order dispersion compensator, finish the dispersion compensation of first kind of light signal after, the light signal of described speed continues to enter mixer through first order circulator;
(2) light signal of other speed sees through the upper level dispersion compensator and enters the next stage circulator, and alternative light signal enters mixer through described next stage circulator after the next stage dispersion compensator is finished dispersion compensation;
(3) Yu Xia light signal repeating step (2) is all finished dispersion compensation up to all light signals;
(4) all light signals return in the optical fiber through mixer.
8,, it is characterized in that the described light signal of finishing dispersion compensation is 40G, 10G or 2.5G light signal according to the described compensation method of claim 7.
9,, it is characterized in that it is through following step as the compensation method of device as described in the claim 5:
(1) the mixing rate light signal is introduced into first order coupler, through first order dispersion compensator, finish the dispersion compensation of first kind of light signal after, the light signal of described speed continues to enter mixer through first order coupler;
(2) light signal of other speed sees through the upper level dispersion compensator and enters the next stage coupler, and alternative light signal enters mixer through described next stage coupler after the next stage dispersion compensator is finished dispersion compensation;
(3) Yu Xia light signal repeating step (2) is all finished dispersion compensation up to all light signals;
(4) all light signals return in the optical fiber through mixer.
10,, it is characterized in that the described light signal of finishing dispersion compensation is 40G, 10G or 2.5G light signal according to the described compensation method of claim 9.
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| CNB021441170A CN1265576C (en) | 2002-09-28 | 2002-09-28 | Apparatus and method for in-line dispersion compensating of mixing rate system |
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| CNB021441170A CN1265576C (en) | 2002-09-28 | 2002-09-28 | Apparatus and method for in-line dispersion compensating of mixing rate system |
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| CN1265576C true CN1265576C (en) | 2006-07-19 |
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