CN103188017B - Quick self-adapted dispersion compensation method in a kind of 40Gbps dwdm system - Google Patents
Quick self-adapted dispersion compensation method in a kind of 40Gbps dwdm system Download PDFInfo
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Abstract
The present invention relates to quick self-adapted dispersion compensation method in a kind of 40Gbps dwdm system, specifically comprise the following steps: steps A: OTU receiver delay interferometer DLI coarse adjustment; Step B: dichotomy dispersion coarse adjustment; Step C:TDC fine tuning; Step D: receiver DLI optimizes; Step e: TDC monitors, and judges whether dispersion changes by FEC correction count or alarm, if dispersion changes, enters step B or C.Method of the present invention, uses dichotomy to find coarse adjustment point fast, adopts mid-point method to find optimum dispersion, effectively reduce the time of dispersion compensation, improve efficiency, avoid the defect of local optimum simultaneously after entering fine tuning.
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.Espespecially in 40Gbps dwdm system, quick self-adapted dispersion compensation method is carried out to single channel.
Background technology
Current, along with the fast development of broadband network, the data traffic requirement of magnanimity causes the R and D of fiber optic transmission system being devoted to low cost, two-forty miscellaneous, optical fiber transmission network is just experiencing from 10Gb/s system to 40Gb/s system even to the leap of 100Gb/s system, transmission range also increases greatly, optical fiber dispersion is to DWDM (Dense WavelengthDivision Multiplexing, intensive multiplexed optical wave with) the transmission performance impact of system is more and more serious, it mainly limits the transmission range of system.
Optical fiber dispersion to the Influencing Mechanism of transmission range mainly dispersion make transmission pulse broadening, thus produce pulse intersymbol interference.Optical fiber dispersion is inversely proportional to the restriction of transmission range and single pass speed square, develop from 10Gbit/s to 40Gbit/s, bit rate is increased to 4 times, limited transmission distance is reduced to 1/16, in order to reduce the impact of optical fiber dispersion on dwdm system transmission range, need to carry out dispersion compensation to the dispersion of Transmission Fibers.
But in the dwdm system of long range propagation, 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 due to the restriction of its manufacture craft, its chromatic dispersion gradient is difficult to accomplish to mate completely with Transmission Fibers, still there is a part of residual dispersion amount in each channel therefore in transmission bandwidth, the residual dispersion amount difference between channel can reach hundreds of ps/nm.
Be in the dwdm system of 10Gbit/s at single channel rate, its system dispersion tolerance limit, namely optical convering unit OTU receives tolerable dispersion range and is about 1000ps/nm, the dispersion that Transmission Fibers is introduced is after the dispersion compensation of dispersion compensation module, and the residual dispersion amount between channel and its otherness can meet far away within the scope of the dispersion tolerance of system.
Be in the dwdm system of 40Gbit/s at single channel rate, 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 between channel cannot meet within the scope of the dispersion tolerance of system.
Therefore be in the long range propagation dwdm system of 40Gbit/s at channel rate, except utilizing except the dispersion of dispersion compensation module to optical fiber compensate, also need to carry out dispersion compensation to single channel, the residual dispersion of each passage in transmission bandwidth can be met within the scope of the dispersion tolerance of system.
In the 40Gbit/s dwdm system of long range propagation, the relation curve of OSNR (Optical Signal To Noise Ratio) cost and system residual chromatic dispersion as shown in Figure 1.In order to reduce the OSNR cost caused by 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 only has tens ps/nm, in order to reduce the impact of the transmission performance deterioration caused by dispersion, single pass dispersion compensation must realize dispersion dynamic compensation by adjustable dispersion compensating module TDCM, makes OTU receive tolerable dispersion and is in optimum value.And compensating adaptive dispersion ADC algorithm can make 40Gbit/s single channel signal realize dispersion dynamic compensation fast, adapt to the change that in dwdm system, circuit dispersion occurs.
At present, conventional dispersion compensation method all adjusts based on step-by-step method, in 40Gbit/s dwdm system, system single channel needs the dispersion compensated to be about 800-1000ps/nm, selected adjustable TDCM module (adjustable chromatic dispersion compensating module) compensation range can be wider, dispersion compensation method defect 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, efficiency is low.And the Best Point that most adjustment can be dispersion adjustment with the point that the error rate is minimum, because error code is paroxysmal mostly, this kind of mode is easy to the puzzlement being absorbed in local optimum, and system cannot be operated on dispersion Best Point.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide quick self-adapted dispersion compensation method in a kind of 40GbpsDWDM system, make up long deficiency of existing dispersion compensation mode used time, dichotomy is used to find coarse adjustment point fast, mid-point method is adopted to find optimum dispersion after entering fine tuning, effectively reduce the time of dispersion compensation, improve efficiency, avoid the defect of local optimum simultaneously.
For reaching above object, 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 comprise the following steps:
Steps A: OTU receiver delay interferometer DLI coarse adjustment, utilize the adjustment of current ratio information realization delay interferometer, control lag interferometer, make it interfere some peak center frequency of mutually long port transmission curve to align with the centre frequency of laser, thus make to interfere mutually long mouth Output optical power maximum;
Step B: dichotomy dispersion coarse adjustment, is adjusted TDCM module by dichotomy, finds rapidly the dispersion of a no alarm interval, starting point using the mid point in this interval as TDC fine tuning, otherwise, continue dispersion coarse adjustment until find the dispersion of no alarm interval, enter next step;
Step C:TDC fine tuning, to enter with a fixed step size increasing or decreasing dispersion to obtain dispersion range with coarse adjustment dispersion point for starting point, finally determines the Best Point of passage residual dispersion, enter next step;
Step D: receiver DLI optimizes, and the FEC correction count monitored by frame unit by logical block and warning information pass to receiver, the control voltage of fine adjustment delay interferometer, until with minimum, obtains the optimum circuit error rate;
Step e: TDC monitors, and judges whether dispersion changes by FEC correction count or alarm, if dispersion changes, enters step B or C.
On the basis of technique scheme, a fixed step size described in step C is 20ps/nm.
On the basis of technique scheme, step B specifically comprises the following steps:
Step B1: the starting step size step_inti=(CD_MAX-TDC_MIN)/2 of definition initial adjustment dispersion, CD_MIN is the starting point of dispersion initial adjustment, regulates dispersion, as having alarm in adjustable range all always with step-length step_inti, then enter B2, B1 regulates terminal to be designated as D1;
Step B2: the starting point adjusted for dispersion with the terminal of step B1 dispersion, regulates dispersion with step-length step_inti, detecting whether have alarm, as there is no alarm situation, then entering B3, and the terminal that B2 regulates is designated as D2;
B3: the step-length of definition dispersion adjustment is step_inti/2, the terminal of an above step joint is the starting point of this step adjustment, and adjust dispersion in the other direction, as alarm always, then enter B4, the terminal that B3 regulates is designated as D3;
B4: the starting point adjusted for dispersion with the terminal of step B3 dispersion, regulates dispersion in the other direction with step-length step_inti/4, and as there is no alarm situation in this process, then the mid point recording D1 and D3 is fine tuning starting point.
On the basis of technique scheme, step C specifically comprises the following steps:
C1: with coarse adjustment dispersion point for starting point, obtains the error condition at this dispersion point place, compares with threshold value thresholding, enters C2, otherwise enter C3 as being less than or equal to threshold value;
C2: dispersion fine tuning 1, regulates dispersion with a fixed step size, finds the maximum dispersion and the minimum dispersion that make error code reach thresholding respectively, get mid point and enter the optimizing phase;
C3: dispersion fine tuning 2, regulates dispersion with a fixed step size, finds out maximum 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 comprises the following steps:
Judge whether dispersion changes by FEC correction count or alarm, if alarm continues for some time, then enter step B, if correction count is more than or equal to threshold value, then enter step C.
Quick self-adapted dispersion compensation method in 40Gbps dwdm system of the present invention, use dichotomy to find coarse adjustment point fast, adopt mid-point method to find optimum dispersion after entering fine tuning, effectively reduce the time of dispersion compensation, improve efficiency, avoid the defect of local optimum simultaneously.
Accompanying drawing explanation
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/D 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 diagram
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention gives in 40Gbit/s dwdm system (referred to as 40G dwdm system) utilizes TDCM to realize the concrete function block diagram of the dynamic dispersion compensation of single channel signal, as shown in Figure 2.Functional block diagram comprises following a few part: Optical Amplifier Unit, adjustable dispersion compensating module TDCM (dispersion compensation unit, hereinafter referred to as TDCM module), control unit, OTU receiver unit, frame unit, logical block.Optical Amplifier Unit gives TDCM module by after the optical signal amplification of reception, frame unit feedback performance information is to control unit, the performance information that control unit is fed back by certain Algorithm Analysis, to configuration order under TDCM module, after TDCM block configuration dispersion compensation values, frame unit performance changes, again this new performance information is fed back to control unit, analyzed by control unit again, circulation like this, until TDCM module dispersion values reaches the patient dispersion compensation optimum value of OTU receiver unit, logical block is to OTU receiver unit ceaselessly feedback information simultaneously, so that OTU receiver unit is operated in optimum state.
ADC technology is according to 40G dwdm system single pass circuit dispersion configuring condition, the information relevant to signal performance fed back by receiving terminal is used as the Main Basis of control algolithm, the dispersion of automatic adjustment TDCM module, when Received signal strength performance reaches optimum state, now passage residual dispersion is exactly best residual dispersion.After the dispersion automatically adjusting TDCM module makes passage residual dispersion be optimum value, ADC also monitors by adjustment passage, make the residual dispersion of passage be in optimum value always, after circuit is switched, if line configuring changes, ADC also can adjust channel dispersion automatically, makes its performance reach best.Whole ADC process does not need manual intervention, and ADC receiver module completes automatic tuning of chromatic dispersion compensation function.
As shown in Figure 3, quick self-adapted dispersion compensation method in 40Gbps dwdm system of the present invention, specifically comprises the following steps:
Steps A: OTU receiver DLI (delay interferometer) coarse adjustment, utilize the adjustment of current ratio information realization delay interferometer, control lag interferometer, make it interfere some peak center frequency of mutually long port transmission curve to align with the centre frequency of laser, thus make to interfere mutually long mouth Output optical power maximum;
Step B: dichotomy dispersion coarse adjustment, by dichotomy, TDCM module is adjusted, find rapidly the dispersion of a no alarm interval, starting point using the mid point in this interval as TDC fine tuning, otherwise (referring to that the dispersion that can not find no alarm is interval), continue dispersion coarse adjustment until find the dispersion of no alarm interval, enter next step; See Fig. 4;
The dispersion range of this step adjustment is comparatively large, and with the compensation range of dispersion compensation module for adjusting interval, judge that whether this interval is effective by alarm, each adjustment is interval shortens half, and linear convergence, finally with the Best Point of two of interval approaching residual dispersions of end points; The method effectively shortens the coarse adjustment time, finds rapidly and effectively the starting point of dispersion fine tuning;
Step C:TDC fine tuning, to enter with a fixed step size increasing or decreasing dispersion to obtain dispersion range with coarse adjustment dispersion point for starting point, finally determines the Best Point of passage residual dispersion, enter next step;
The dispersion range of this step adjustment is less.Adjustment step-length can be set to 20ps/nm, searches out the minimum and maximum dispersion point reaching Rule of judgment, gets mid point and enter optimization.This approach avoid the shortcoming that dispersion adjustment is absorbed in local optimum;
Step D: receiver DLI optimizes, and the FEC correction count monitored by frame unit by logical block and warning information pass to receiver, the control voltage of fine adjustment delay interferometer, until with minimum, obtains the optimum circuit error rate;
Step e: TDC monitors, and judges whether dispersion changes by FEC correction count or alarm, if dispersion changes, enters step B or C.
On the basis of technique scheme, step B specifically comprises the following steps:
Step B1: the starting step size step_inti=(CD_MAX-TDC_MIN)/2 of definition initial adjustment dispersion, CD_MIN is the starting point of dispersion initial adjustment, regulates dispersion, as having alarm in adjustable range all always with step-length step_inti, then enter B2, B1 regulates terminal to be designated as D1;
Step B2: the starting point adjusted for dispersion with the terminal of step B1 dispersion, regulates dispersion with step-length step_inti, detecting whether have alarm, as there is no alarm situation, then entering B3, and the terminal that B2 regulates is designated as D2;
B3: the step-length of definition dispersion adjustment is step_inti/2, the terminal of an above step joint is the starting point of this step adjustment, and adjust dispersion in the other direction, as alarm always, then enter B4, the terminal that B3 regulates is designated as D3;
B4: the starting point adjusted for dispersion with the terminal of step B3 dispersion, regulates dispersion in the other direction with step-length step_inti/4, and as there is no alarm situation in this process, then the mid point recording D1 and D3 is fine tuning starting point.
On the basis of technique scheme, step C specifically comprises the following steps:
C1: with coarse adjustment dispersion point for starting point, obtains the error condition at this dispersion point place, compares with threshold value thresholding, enters C2, otherwise enter C3 as being less than or equal to threshold value;
C2: dispersion fine tuning 1, regulates dispersion with a fixed step size, finds the maximum dispersion and the minimum dispersion that make error code reach thresholding respectively, get mid point and enter the optimizing phase, see Fig. 5;
C3: dispersion fine tuning 2, regulates dispersion with a fixed step size, finds out maximum dispersion and the minimum dispersion point of existing alarm respectively, get mid point and enter the optimizing phase, see Fig. 6;
In described step C, the step-length of dispersion adjustment is 20ps/nm.
On the basis of technique scheme, step e specifically comprises the following steps:
Judge whether dispersion changes by FEC correction count or alarm, if alarm continues for some time (being such as greater than 30s), then enter step B, if correction count is more than or equal to threshold value, then enter step C.
In step e, if the alarm that OTU receiver monitors continues for some time, then think that large saltus step occurs the residual dispersion of passage, need again to find the optimal compensation dispersion point, enter second step dispersion coarse adjustment.If OTU receiver continues for some time the error rate collected be greater than threshold value, then need only enter fine tuning, fine tuning dispersion, finally find optimum dispersion point, the stability of safeguards system.
The method of the invention, overcome the defect that general dispersion regulation time is long, dichotomy is adopted during coarse adjustment dispersion, enter rapidly dispersion fine tuning, during dispersion fine tuning, enter dispersion fine tuning 1 or dispersion fine tuning 2 by condition judgment, find qualified minimum and maximum dispersion point, choose mid point as best residual dispersion point.OTU receiver is optimized and the process of dispersion fine tuning association, and the change of Real-Time Monitoring dispersion, has ensured the stability that system transmits.
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (4)
1. a quick self-adapted dispersion compensation method in 40Gbps dwdm system, is characterized in that, specifically comprise the following steps:
Steps A: OTU receiver delay interferometer DLI coarse adjustment, utilize the adjustment of current ratio information realization delay interferometer, control lag interferometer, make it interfere some peak center frequency of mutually long port transmission curve to align with the centre frequency of laser, thus make to interfere mutually long mouth Output optical power maximum;
Step B: dichotomy dispersion coarse adjustment, is adjusted adjustable dispersion compensating module TDCM by dichotomy, finds rapidly the dispersion of a no alarm interval, starting point using the mid point in this interval as TDC fine tuning, otherwise, continue dispersion coarse adjustment until find the dispersion of no alarm interval, enter next step;
Step C:TDC fine tuning, to enter with a fixed step size increasing or decreasing dispersion to obtain dispersion range with the dispersion interval midpoint of no alarm for starting point, finally determines the Best Point of passage residual dispersion, enter next step;
Step D: receiver DLI optimizes, and the FEC correction count monitored by frame unit by logical block and warning information pass to receiver, the control voltage of fine adjustment delay interferometer, until with minimum, obtains the optimum circuit error rate;
Step e: TDC monitors, and judges whether dispersion changes by FEC correction count or alarm, if dispersion changes, enters step B or C;
Wherein, OTU is optical convering unit, and TDC is adjustable dispersion compensating;
Step C specifically comprises the following steps:
C1: with coarse adjustment dispersion point for starting point, obtains the error condition at this dispersion point place, compares with threshold value thresholding, enters C2, otherwise enter C3 as being less than or equal to threshold value;
C2: dispersion fine tuning 1, regulates dispersion with a fixed step size, finds the maximum dispersion and the minimum dispersion that make error code reach thresholding respectively, get mid point and enter the optimizing phase;
C3: dispersion fine tuning 2, regulates dispersion with a fixed step size, finds out maximum dispersion and the minimum dispersion point of existing alarm respectively, get mid point and enter the optimizing phase.
2. quick self-adapted dispersion compensation method in 40Gbps dwdm system as claimed in claim 1, is characterized in that: a fixed step size described in step C is 20ps/nm.
3. quick self-adapted dispersion compensation method in 40Gbps dwdm system as claimed in claim 1, it is characterized in that, step B specifically comprises the following steps:
Step B1: the starting step size step_inti=(CD_MAX-CD_MIN)/2 of definition initial adjustment dispersion, CD_MIN is the starting point of dispersion initial adjustment, CD_MAX is the terminating point of dispersion initial adjustment, dispersion is regulated with step-length step_inti, as having alarm in adjustable range all always, then enter B2, B1 regulates terminal to be designated as D1;
Step B2: the starting point adjusted for dispersion with the terminal of step B1 dispersion, regulates dispersion with step-length step_inti, detecting whether have alarm, as there is no alarm situation, then entering B3, and the terminal that B2 regulates is designated as D2;
B3: the step-length of definition dispersion adjustment is step_inti/2, the terminal of an above step joint is the starting point of this step adjustment, and adjust dispersion in the other direction, as alarm always, then enter B4, the terminal that B3 regulates is designated as D3;
B4: the starting point adjusted for dispersion with the terminal of step B3 dispersion, regulates dispersion in the other direction with step-length step_inti/4, and as there is no alarm situation in this process, then the mid point recording D1 and D3 is fine tuning starting point.
4. quick self-adapted dispersion compensation method in 40Gbps dwdm system as claimed in claim 1, it is characterized in that, step e specifically comprises the following steps:
Judge whether dispersion changes by FEC correction count or alarm, if alarm continues for some time, then enter step B, if correction count is more than or equal to threshold value, then enter step C;
If the alarm that OTU receiver monitors continues for some time, then think that large saltus step occurs the residual dispersion of passage, need again to find the optimal compensation dispersion point, enter dispersion coarse adjustment; If OTU receiver continues for some time the error rate collected be greater than threshold value, then need only enter TDC fine tuning, find optimum dispersion point.
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| CN103973368B (en) * | 2014-03-17 | 2016-06-08 | 烽火通信科技股份有限公司 | A kind of compensating adaptive dispersion method of adjustment |
| CN104601239B (en) * | 2015-01-12 | 2017-05-17 | 西南交通大学 | Optical fiber adaptive nonlinear compensation method 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 |
| CN110875772B (en) * | 2018-08-30 | 2022-08-05 | 光联通讯技术有限公司美国分部 | Optical fiber dispersion monitoring device |
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| CN101588209B (en) * | 2008-05-23 | 2011-11-30 | 中兴通讯股份有限公司 | Self-adaptive chromatic dispersion compensation method |
| CN101599797B (en) * | 2008-06-06 | 2012-04-04 | 中兴通讯股份有限公司 | Method and device for triggering automatic dispersion compensation regulation |
| CN102075241B (en) * | 2009-11-19 | 2014-01-01 | 华为技术有限公司 | Method and device for dynamically detecting chromatic dispersion |
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