CN103188017A - Fast self-adaptive dispersion compensation method in 40Gbps DWDM (dense wavelength division multiplexing) system - Google Patents
Fast self-adaptive dispersion compensation method in 40Gbps DWDM (dense wavelength division multiplexing) system Download PDFInfo
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Abstract
The invention relates to a fast self-adaptive dispersion compensation method in a 40Gbps DWDM (dense wavelength division multiplexing) system. The fast self-adaptive dispersion compensation method specifically comprises the following steps: step A) delaying coarse regulation of an interferometer DLI (delay line interferometer) by an OTU (optical transport unit) receiver; step B) performing dispersion coarse regulation through a dichotomic method; step C) performing fine regulation through a TDC (time-to-digital converter); step D): optimizing the DLI through the receiver; and step E) monitoring through the TDC, judging whether dispersion changes or not by FEC (forward error control) error correction counting or warning and entering step B) or C) if the dispersion changes. According to the method disclosed by the invention, a coarse regulation point is fast found by using the dichotomic method, the optimal dispersion is found by adopting a mid-point method after entering the fine regulation step, the dispersion compensation time is effectively reduced, the efficiency is improved, and the defects of local optimization can be simultaneously avoided.
Description
Technical field
The present invention relates to 40Gbit/s DWDM long haul transmission system, is quick self-adapted dispersion compensation method in a kind of 40Gbps dwdm system specifically.Especially refer in the 40Gbps dwdm system single channel be carried out quick self-adapted dispersion compensation method.
Background technology
Current, fast development along with broadband network, the data traffic requirement of magnanimity has caused the R and D of being devoted to the fiber optic transmission system of low cost, two-forty miscellaneous, optical fiber transmission network is just experiencing from the 10Gb/s system to the 40Gb/s system even to the leap of 100Gb/s system, transmission range also increases greatly, optical fiber dispersion is to DWDM (Dense Wavelength Division Multiplexing, intensive multiplexed optical wave usefulness) the transmission performance influence of system is more and more serious, and it mainly is the transmission range that has limited system.
Optical fiber dispersion mainly is that chromatic dispersion makes the transmission pulse broadening to the mechanism that influences of transmission range, thereby produces the pulse intersymbol interference.Optical fiber dispersion square is inversely proportional to the restriction of transmission range and single pass speed, develop to 40Gbit/s from 10Gbit/s, bit rate is increased to 4 times, limited transmission distance is reduced to 1/16, in order to reduce optical fiber dispersion to the influence of dwdm system transmission range, need carry out dispersion compensation to the chromatic dispersion of Transmission Fibers.
But in the dwdm system of long Distance Transmission, transmission fibre type is the G655 optical fiber of G652 or large effective area, its abbe number all has certain slope, and dispersion compensation module is because the restriction of its manufacture craft, its chromatic dispersion gradient is difficult to accomplish mate fully with Transmission Fibers, therefore still there is a part of residual dispersion amount in each channel in the transmission bandwidth, and the residual dispersion amount difference of interchannel can reach hundreds of ps/nm.
Be in the dwdm system of 10Gbit/s in single channel speed, its system dispersion tolerance limit, be that optical convering unit OTU receives tolerable dispersion range and is about 1000ps/nm, the chromatic dispersion that Transmission Fibers is introduced is through behind the dispersion compensation of dispersion compensation module, the residual dispersion amount of interchannel with and otherness can satisfy far away in the dispersion tolerance scope of system.
Be in the dwdm system of 40Gbit/s in single channel speed, its system dispersion tolerance limit reduces greatly along with the increase of channel rate, is approximately about tens ps/nm, and the residual dispersion amount difference of interchannel can't satisfy in the dispersion tolerance scope of system.
Therefore be in the long Distance Transmission dwdm system of 40Gbit/s at channel rate, except utilizing dispersion compensation module compensates CHROMATIC DISPERSION IN FIBER OPTICS, also need single channel is carried out dispersion compensation, the residual dispersion of each passage in the transmission bandwidth can both be satisfied in the dispersion tolerance scope of system.
In the 40Gbit/s dwdm system of long Distance Transmission, the relation curve of OSNR (Optical Signal To Noise Ratio) cost and system residual chromatic dispersion as shown in Figure 1.For the OSNR cost that reduces to be caused by chromatic dispersion, there is an optimum value in the residual dispersion value of system.Because the dispersion tolerance scope of the dwdm system of 40Gbit/s has only tens ps/nm, in order to reduce the influence of the transmission performance deterioration that is caused by chromatic dispersion, single pass dispersion compensation must be realized dispersion dynamic compensation by adjustable dispersion compensating module TDCM, makes OTU receive tolerable chromatic dispersion and is in optimum value.And compensating adaptive dispersion ADC algorithm can make the 40Gbit/s single channel signal realize dispersion dynamic compensation fast, adapts to the variation that the circuit chromatic dispersion takes place in the dwdm system.
At present, dispersion compensation method commonly used all is that the basis is adjusted with the step-by-step method, the chromatic dispersion that system's single channel need compensate in the 40Gbit/s dwdm system is about 800-1000ps/nm, selected adjustable TDCM module (adjustable chromatic dispersion compensating module) compensation range can be wideer, dispersion compensation method defective based on step-by-step method is, travels through all dispersion points with a fixed step size, searches out best residual dispersion point, length consuming time, efficient is low.And most to regulate with meeting be the best point of dispersion adjustment with the point of error rate minimum, because error code is paroxysmal mostly, this kind mode is easy to be absorbed in the puzzlement of local optimum, and system can't be operated on the best point of chromatic dispersion.
Summary of the invention
At the defective that exists in the prior art, the object of the present invention is to provide quick self-adapted dispersion compensation method in a kind of 40GbpsDWDM system, remedy existing long deficiency of dispersion compensation mode time spent, use dichotomy to find the coarse adjustment point fast, adopt mid-point method to find optimum dispersion after entering fine tuning, effectively reduce the time of dispersion compensation, improved efficient, avoided the defective of local optimum simultaneously.
For reaching above purpose, the technical scheme that the present invention takes is:
Quick self-adapted dispersion compensation method in a kind of 40Gbps dwdm system is characterized in that, specifically may further comprise the steps:
Steps A: OTU receiver delay interferometer DLI coarse adjustment, utilize current ratio information to realize the adjusting of delay interferometer, the control lag interferometer, its some peak value centre frequency of interfering long oral instructions mutually to fail curve is alignd with the centre frequency of laser, thereby make interference long mouthful of Output optical power maximum mutually;
Step B: dichotomy chromatic dispersion coarse adjustment, by dichotomy the TDCM module is adjusted, find one rapidly with nowhere to turn to alert chromatic dispersion interval, with the starting point of this interval mid point as the TDC fine tuning, otherwise, continue the chromatic dispersion coarse adjustment up to finding with nowhere to turn to alert chromatic dispersion interval, enter next step;
Step C:TDC fine tuning is that starting point enters with a fixed step size increasing or decreasing chromatic dispersion and obtains dispersion range with the coarse adjustment dispersion point, finally determines the best point of passage residual dispersion, enters next step;
Step D: receiver DLI optimizes, and FEC error correction counting and the warning information that will become frame unit to monitor by logical block pass to receiver, the control voltage of fine adjustment delay interferometer, up to and minimum, obtain the circuit error rate of optimum;
Step e: TDC monitoring judges by FEC error correction counting or alarm whether chromatic dispersion changes, if chromatic dispersion changes, enters step B or C.
On the basis of technique scheme, the described fixed step size of step C is 20ps/nm.
On the basis of technique scheme, step B specifically may further comprise the steps:
Step B1: the starting step size step_inti=(CD_MAX-TDC_MIN)/2 of definition initial adjustment chromatic dispersion, CD_MIN is the starting point of chromatic dispersion initial adjustment, regulates chromatic dispersion with step-length step_inti, as alarm is all arranged in adjustable range always, then enter B2, B1 regulates terminal point and is designated as D1;
Step B2: the terminal point with step B1 chromatic dispersion is the starting point that chromatic dispersion is adjusted, and regulates chromatic dispersion with step-length step_inti, and whether have alarm, as occurring with nowhere to turn to the alert condition, then enter B3 if detecting, and the terminal point that B2 regulates is designated as D2;
B3: the step-length of definition dispersion adjustment is step_inti/2, more than the starting point adjusted for this step of the terminal point of step joint, adjust chromatic dispersion in the other direction, as alarm always, then enter B4, the terminal point of B3 adjusting is designated as D3;
B4: be the starting point that chromatic dispersion is adjusted with the terminal point of step B3 chromatic dispersion, regulate chromatic dispersion in the other direction with step-length step_inti/4, in this process as occur with nowhere to turn to the alert condition, the mid point that then records D1 and D3 is the fine tuning starting point.
On the basis of technique scheme, step C specifically may further comprise the steps:
C1: be starting point with the coarse adjustment dispersion point, obtain the error condition at this dispersion point place, with the threshold value thresholding relatively, as entering C2 smaller or equal to threshold value, otherwise enter C3;
C2: chromatic dispersion fine tuning 1, regulate chromatic dispersion with a fixed step size, find the maximum chromatic dispersion and the minimum dispersion that make error code reach thresholding respectively, get mid point and enter the optimizing phase;
C3: chromatic dispersion fine tuning 2, regulate chromatic dispersion with a fixed step size, find out maximum chromatic dispersion and the minimum dispersion point of existing alarm respectively, get mid point and enter the optimizing phase.
On the basis of technique scheme, step e specifically may further comprise the steps:
Judge by FEC error correction counting or alarm whether chromatic dispersion changes, if alarm continues for some time, then enter step B, if the error correction counting then enters step C more than or equal to threshold value.
Quick self-adapted dispersion compensation method in the 40Gbps dwdm system of the present invention, use dichotomy to find the coarse adjustment point fast, adopt mid-point method to find optimum dispersion after entering fine tuning, effectively reduced the time of dispersion compensation, improve efficient, avoided the defective of local optimum simultaneously.
Description of drawings
The present invention has following accompanying drawing:
The relation curve of Fig. 1 system residual chromatic dispersion marginal range and OSNR cost
Fig. 2 realizes the functional block diagram of compensating adaptive dispersion
Fig. 3 fast A C adjusts implementation method
Fig. 4 dichotomy TDC coarse adjustment schematic diagram
Fig. 5 TDC fine tuning 1 schematic diagram
Fig. 6 TDC fine tuning 2 schematic diagrames
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
The present invention has provided the concrete function block diagram that utilizes TDCM to realize the dynamic dispersion compensation of single channel signal in the 40Gbit/s dwdm system (abbreviating the 40G dwdm system as), as shown in Figure 2.Comprise following a few part in the functional block diagram: Optical Amplifier Unit, adjustable dispersion compensating module TDCM (dispersion compensation unit, hereinafter referred are the TDCM module), control unit, OTU receiver unit become frame unit, logical block.Optical Amplifier Unit is given TDCM module after the light signal that receives is amplified, become frame unit feedback performance information to give control unit, control unit is by the performance information of certain Algorithm Analysis feedback, give configuration order under the TDCM module, after the TDCM block configuration dispersion compensation value, framing unit performance changes, again this new performance information is fed back to control unit, again by the control unit analysis, so circulation, reach the patient dispersion compensation optimum value of OTU receiver unit until TDCM module dispersion values, the feedback information that the while logical block is not stopped to the OTU receiver unit is so that the OTU receiver unit is operated in optimum state.
The ADC technology is according to the single pass circuit chromatic dispersion of 40G dwdm system configuring condition, be used as the main foundation of control algolithm by the information relevant with signal performance of receiving terminal feedback, automatically adjust the chromatic dispersion of TDCM module, when the reception signal performance reached optimum state, this moment, the passage residual dispersion was exactly best residual dispersion.After the chromatic dispersion of adjusting the TDCM module automatically makes the passage residual dispersion be optimum value, ADC also monitors being adjusted passage, make the residual dispersion of passage be in optimum value always, after circuit is switched, if line configuring changes, ADC also can adjust automatically to the passage chromatic dispersion, makes its performance reach best.Whole ADC process does not need manual intervention, and the ADC receiver module is finished automatic adjustment chromatic dispersion compensating function.
As shown in Figure 3, quick self-adapted dispersion compensation method in the 40Gbps dwdm system of the present invention specifically may further comprise the steps:
Steps A: OTU receiver DLI (delay interferometer) coarse adjustment, utilize current ratio information to realize the adjusting of delay interferometer, the control lag interferometer, its some peak value centre frequency of interfering long oral instructions mutually to fail curve is alignd with the centre frequency of laser, thereby make interference long mouthful of Output optical power maximum mutually;
Step B: dichotomy chromatic dispersion coarse adjustment, by dichotomy the TDCM module is adjusted, find one rapidly with nowhere to turn to alert chromatic dispersion interval, with the starting point of this interval mid point as the TDC fine tuning, otherwise (referring to can not find the chromatic dispersion interval with nowhere to turn to alert), continue the chromatic dispersion coarse adjustment up to finding with nowhere to turn to alert chromatic dispersion interval, enter next step; Referring to Fig. 4;
The dispersion range that this step is adjusted is bigger, serves as to adjust intervally with the compensation range of dispersion compensation module, judges by alarm whether this interval is effective, and each the adjustment intervally shortened half, and linear convergence finally approaches the best point of residual dispersion with two end points in interval; The method has effectively shortened the coarse adjustment time, finds the starting point of chromatic dispersion fine tuning rapidly and effectively;
Step C:TDC fine tuning is that starting point enters with a fixed step size increasing or decreasing chromatic dispersion and obtains dispersion range with the coarse adjustment dispersion point, finally determines the best point of passage residual dispersion, enters next step;
The dispersion range that this step is adjusted is less.Adjust step-length and can be set to 20ps/nm, search out the minimum and maximum dispersion point that reaches Rule of judgment, get mid point and enter optimization.The method has avoided the chromatic dispersion adjustment to be absorbed in the shortcoming of local optimum;
Step D: receiver DLI optimizes, and FEC error correction counting and the warning information that will become frame unit to monitor by logical block pass to receiver, the control voltage of fine adjustment delay interferometer, up to and minimum, obtain the circuit error rate of optimum;
Step e: TDC monitoring judges by FEC error correction counting or alarm whether chromatic dispersion changes, if chromatic dispersion changes, enters step B or C.
On the basis of technique scheme, step B specifically may further comprise the steps:
Step B1: the starting step size step_inti=(CD_MAX-TDC_MIN)/2 of definition initial adjustment chromatic dispersion, CD_MIN is the starting point of chromatic dispersion initial adjustment, regulates chromatic dispersion with step-length step_inti, as alarm is all arranged in adjustable range always, then enter B2, B1 regulates terminal point and is designated as D1;
Step B2: the terminal point with step B1 chromatic dispersion is the starting point that chromatic dispersion is adjusted, and regulates chromatic dispersion with step-length step_inti, and whether have alarm, as occurring with nowhere to turn to the alert condition, then enter B3 if detecting, and the terminal point that B2 regulates is designated as D2;
B3: the step-length of definition dispersion adjustment is step_inti/2, more than the starting point adjusted for this step of the terminal point of step joint, adjust chromatic dispersion in the other direction, as alarm always, then enter B4, the terminal point of B3 adjusting is designated as D3;
B4: be the starting point that chromatic dispersion is adjusted with the terminal point of step B3 chromatic dispersion, regulate chromatic dispersion in the other direction with step-length step_inti/4, in this process as occur with nowhere to turn to the alert condition, the mid point that then records D1 and D3 is the fine tuning starting point.
On the basis of technique scheme, step C specifically may further comprise the steps:
C1: be starting point with the coarse adjustment dispersion point, obtain the error condition at this dispersion point place, with the threshold value thresholding relatively, as entering C2 smaller or equal to threshold value, otherwise enter C3;
C2: chromatic dispersion fine tuning 1, regulate chromatic dispersion with a fixed step size, find the maximum chromatic dispersion and the minimum dispersion that make error code reach thresholding respectively, get mid point and enter the optimizing phase, referring to Fig. 5;
C3: chromatic dispersion fine tuning 2, regulate chromatic dispersion with a fixed step size, find out maximum chromatic dispersion and the minimum dispersion point of existing alarm respectively, get mid point and enter the optimizing phase, referring to Fig. 6;
The step-length of dispersion adjustment is 20ps/nm among the described step C.
On the basis of technique scheme, step e specifically may further comprise the steps:
Judge by FEC error correction counting or alarm whether chromatic dispersion changes, if alarm continues for some time (for example greater than 30s), then enter step B, if the error correction counting then enters step C more than or equal to threshold value.
In the step e, if the alarm that the OTU receiver monitors continues for some time, think that then big saltus step takes place the residual dispersion of passage, need seek the The optimal compensation dispersion point again, enter the chromatic dispersion coarse adjustment of second step.If the OTU receiver continues for some time the error rate that collects greater than threshold value, then need only enter fine tuning, the fine tuning chromatic dispersion is finally found the optimum dispersion point, the stability of safeguards system.
The method of the invention, overcome general chromatic dispersion and adjusted the defective of overlong time, adopt dichotomy during the coarse adjustment chromatic dispersion, enter the chromatic dispersion fine tuning rapidly, during the chromatic dispersion fine tuning, enter chromatic dispersion fine tuning 1 or chromatic dispersion fine tuning 2 by condition judgment, find qualified minimum and maximum dispersion point, choose mid point as best residual dispersion point.The OTU receiver is optimized and chromatic dispersion fine tuning association handles, and monitors the variation of chromatic dispersion in real time, the stability that the system that ensured transmits.
The content that is not described in detail in this specification belongs to this area professional and technical personnel's known prior art.
Claims (5)
1. quick self-adapted dispersion compensation method in the 40Gbps dwdm system is characterized in that, specifically may further comprise the steps:
Steps A: OTU receiver delay interferometer DLI coarse adjustment, utilize current ratio information to realize the adjusting of delay interferometer, the control lag interferometer, its some peak value centre frequency of interfering long oral instructions mutually to fail curve is alignd with the centre frequency of laser, thereby make interference long mouthful of Output optical power maximum mutually;
Step B: dichotomy chromatic dispersion coarse adjustment, by dichotomy the TDCM module is adjusted, find one rapidly with nowhere to turn to alert chromatic dispersion interval, with the starting point of this interval mid point as the TDC fine tuning, otherwise, continue the chromatic dispersion coarse adjustment up to finding with nowhere to turn to alert chromatic dispersion interval, enter next step;
Step C:TDC fine tuning is that starting point enters with a fixed step size increasing or decreasing chromatic dispersion and obtains dispersion range with the coarse adjustment dispersion point, finally determines the best point of passage residual dispersion, enters next step;
Step D: receiver DLI optimizes, and FEC error correction counting and the warning information that will become frame unit to monitor by logical block pass to receiver, the control voltage of fine adjustment delay interferometer, up to and minimum, obtain the circuit error rate of optimum;
Step e: TDC monitoring judges by FEC error correction counting or alarm whether chromatic dispersion changes, if chromatic dispersion changes, enters step B or C.
2. quick self-adapted dispersion compensation method in the 40Gbps dwdm system as claimed in claim 1, it is characterized in that: the described fixed step size of step C is 20ps/nm.
3. quick self-adapted dispersion compensation method in the 40Gbps dwdm system as claimed in claim 1 is characterized in that step B specifically may further comprise the steps:
Step B1: the starting step size step_inti=(CD_MAX-TDC_MIN)/2 of definition initial adjustment chromatic dispersion, CD_MIN is the starting point of chromatic dispersion initial adjustment, regulates chromatic dispersion with step-length step_inti, as alarm is all arranged in adjustable range always, then enter B2, B1 regulates terminal point and is designated as D1;
Step B2: the terminal point with step B1 chromatic dispersion is the starting point that chromatic dispersion is adjusted, and regulates chromatic dispersion with step-length step_inti, and whether have alarm, as occurring with nowhere to turn to the alert condition, then enter B3 if detecting, and the terminal point that B2 regulates is designated as D2;
B3: the step-length of definition dispersion adjustment is step_inti/2, more than the starting point adjusted for this step of the terminal point of step joint, adjust chromatic dispersion in the other direction, as alarm always, then enter B4, the terminal point of B3 adjusting is designated as D3;
B4: be the starting point that chromatic dispersion is adjusted with the terminal point of step B3 chromatic dispersion, regulate chromatic dispersion in the other direction with step-length step_inti/4, in this process as occur with nowhere to turn to the alert condition, the mid point that then records D1 and D3 is the fine tuning starting point.
4. quick self-adapted dispersion compensation method in the 40Gbps dwdm system as claimed in claim 1 is characterized in that step C specifically may further comprise the steps:
C1: be starting point with the coarse adjustment dispersion point, obtain the error condition at this dispersion point place, with the threshold value thresholding relatively, as entering C2 smaller or equal to threshold value, otherwise enter C3;
C2: chromatic dispersion fine tuning 1, regulate chromatic dispersion with a fixed step size, find the maximum chromatic dispersion and the minimum dispersion that make error code reach thresholding respectively, get mid point and enter the optimizing phase;
C3: chromatic dispersion fine tuning 2, regulate chromatic dispersion with a fixed step size, find out maximum chromatic dispersion and the minimum dispersion point of existing alarm respectively, get mid point and enter the optimizing phase.
5. quick self-adapted dispersion compensation method in the 40Gbps dwdm system as claimed in claim 1 is characterized in that step e specifically may further comprise the steps:
Judge by FEC error correction counting or alarm whether chromatic dispersion changes, if alarm continues for some time, then enter step B, if the error correction counting then enters step C more than or equal to threshold value.
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| CN103973368A (en) * | 2014-03-17 | 2014-08-06 | 烽火通信科技股份有限公司 | Adaptive dispersion compensation adjustment method |
| CN104601239A (en) * | 2015-01-12 | 2015-05-06 | 西南交通大学 | Optical fiber adaptive nonlinear compensation scheme based on intensity noise variance and low-pass filter |
| CN108964757A (en) * | 2017-05-19 | 2018-12-07 | 北京华为数字技术有限公司 | Signal errors alarm method and device |
| CN110875772A (en) * | 2018-08-30 | 2020-03-10 | 光联通讯技术有限公司美国分部 | Optical fiber dispersion monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103973368A (en) * | 2014-03-17 | 2014-08-06 | 烽火通信科技股份有限公司 | Adaptive dispersion compensation adjustment method |
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| CN108964757A (en) * | 2017-05-19 | 2018-12-07 | 北京华为数字技术有限公司 | Signal errors alarm method and device |
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