CN101183913B - Method for fine adjustment of dispersion compensation in wavelength division multiplexing optical transmission system - Google Patents
Method for fine adjustment of dispersion compensation in wavelength division multiplexing optical transmission system Download PDFInfo
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- CN101183913B CN101183913B CN2007101778246A CN200710177824A CN101183913B CN 101183913 B CN101183913 B CN 101183913B CN 2007101778246 A CN2007101778246 A CN 2007101778246A CN 200710177824 A CN200710177824 A CN 200710177824A CN 101183913 B CN101183913 B CN 101183913B
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Abstract
The invention relates to a method of adjusting chromatic dispersion compensation accurately in a wavelength division multiplex optical transmission system. The OUT unit of sending end encodes the digital electrical signal needed to transfer to the circuit in FEC. After WDM circuit transmission, FEC decoder chip in the OUT unit of receiving end decodes the received digital signal in FEC. The decoder chip takes real-time statistics for wrong code words to confirm the quantity of 0 error check and 1 error check in the current short time slice. The invention has the advantages that the TDC device in front of the OUT unit of receiving end compensates the chromatic dispersion in circuit transmission; the FEC decoder chip sends the error check quantity back to TDC; the CPU of TDC enables dynamic control to the quantity of circuit chromatic dispersion compensation according to the statistic information of bit error check.
Description
Technical field
The present invention relates to accurately adjust in a kind of Wave division multiplexing optical transmission system the method for dispersion compensation, dispersion compensation can't adapt to the situation that circuit changes automatically in the existing wavelength-division system to improve.
Background technology
At present, DWDM (Dense Wavelength-Division Multiplexing dense wave division multipurpose) equipment has been widely used in the construction of transmission networks at different levels, from the backbone network to this locality and metro core network DWDM communications platform proportion increasing, cross SDH (Synchronous Digital Hierarchy SDH (Synchronous Digital Hierarchy)) layer, realize that directly IP operation is more and more higher at the cry of WDM (Wavelength-Division Multiplexing wavelength division multiplexing) transmission over networks.Emerging of a large amount of commercializations of extra long distance WDM equipment and 80 * 40Gbit/s wavelength-division system solved the application demand of big capacity, two-forty, long distance basically, and the appearance of ROADM (Reconfigurable Optical Add/Drop Multiplexer Reconfigurable Optical Add/drop Multiplexer) equipment also makes the WDM equipment network carry out the transition to ring-network topology, the crossing topology of two rings and more complicated lattice shape networking from simple pointtopoint topology, realizes the mesh network topology the most at last.During ROADM equipment is used, network change is more frequent, for each radio frequency channel, in case the variation of start-stop node takes place, the physical quantity such as for example loss, chromatic dispersion etc. that influences communication quality also can produce than big-difference, therefore, the network for ROADM equipment is formed certainly will will have the solution of the dispersion compensation of maneuverability more.In addition, especially the 40Gbit/s signal is had higher requirement for the accuracy of dispersion compensation, and the slight dispersion variation of circuit all may cause received signal error code even interruption.
CHROMATIC DISPERSION IN FIBER OPTICS can be divided into modal dispersion, material dispersion, waveguide dispersion and polarization mode dispersion.For wdm system, because the light pulse of different wave length has different propagation velocitys in optical fiber, the dispersion limit of each wavelength can there are differences.At present 2.5Gbit/s signal dispersion limit in optical fiber G.652 can reach 640KM, basically need not consider the compensation of chromatic dispersion, the about 1600ps/nm of value is held in the chromatic dispersion of 10Gbit/s light source, be equivalent to the G.652 transmission range of optical fiber 80km, the about 60ps/nm of value is held in the chromatic dispersion of 40Gbit/s light source, be equivalent to the G.652 transmission range of optical fiber 3km, must the chromatic dispersion in the optical fiber be compensated when surpassing the dispersion limited transmission range.
At present, to the compensation technique section of the mainly containing internal fixation dispersing optics compensation of chromatic dispersion, electric territory dispersion compensation, compensating adaptive dispersion etc., compensating element, mainly contains DCF (DispersionCompensation Fiber dispersion compensating fiber) and FBG (Fiber Bragg Grating Fiber Bragg Grating FBG) compensating element, during the internal fixation dispersing optics compensation of its stage casing.Compensating element, has very big negative dispersion coefficient usually, can reach 100ps/nm/km.DCF has obtained a large amount of commercializations now.The DCF technology is ripe relatively, simple, be fit to long compensated distance, have controlled chromatic dispersion compensation quantity, stronger upgrading potentiality, enough big bandwidth, transparent to transformat and bit rate, with WDM compatibility, steady performance, thereby adopt DCF to carry out dispersion compensation to have clear superiority, find broad application.G.652 and G.655 wait the optical fiber of different model, there is different dispersion compensating fibers corresponding with it respectively at.But in actual applications, this compensation scheme also exists certain problem, the dispersion values that is compensating element, is fixed, and each section CHROMATIC DISPERSION IN FIBER OPTICS is difficult in and obtains fine compensation in this section, simultaneously, the actual dispersion of optical fiber also for example constantly changes variation of temperature along with the time and changes dispersion measure (the temperature variant drift value of zero-dispersion wavelength of fiber is 0.03nm/ ℃).In addition, also can there be the fine operation of signal in the span line, also have chromatic dispersion difference even light signal still transmits in same optical cable but in the different fibre core, all of these factors taken together all will influence the effect of this fixedly dispersion compensation schemes, particularly for the 40Gbit/s signal.Therefore, now to the two-forty long-haul transmission system particularly the 40Gbit/s transmission system to carry out dynamic dispersion compensation be that adjustable chromatic dispersion compensation (TDC) is necessary very much.
Tunable Dispersion Compensator spare can carry out very accurate dispersion compensation, and this product commercialization degree is better at present, can realize fully that 80km is with interior all kinds of CHROMATIC DISPERSION IN FIBER OPTICS compensation.Handle by pulse signal transmitting terminal, also can improve warbling and dispersion of light pulse, thereby increase the optical transmission distance of no chromatic dispersion compensation, satisfy the transmission requirement of metropolitan area network, this method does not need to increase in addition dispersion compensation device, can save cost and simplied system structure.Multiple realization technology is arranged at present, can accomplish bigger chromatic dispersion compensation quantity and compensation control flexibly basically.
When adjustable dispersion compensating elements such as utilizing TDC carries out accurate dispersion compensation; utilize the actual residual dispersion amount of chromatic dispersion test instrument measurement circuit often earlier; Artificial Control TDC device adjustment chromatic dispersion compensation quantity carries out accurate dispersion compensation then; this is very effective for the dispersion compensation that solves under the 40Gbit/s signal quiescent conditions; but when circuit changes; for example transmission path changes by ROADM generation Wavelength dispatching; fall fine; the protection of different routes is switched; even the aging abbe number that produces of long-time optical cable changes; can't accomplish that at this moment thereby these variations of real-time response ensure service reliability in the very first time, dispersion compensating fiber or TDC device are controlled adjustment adapt to these variations and must rely on manually by the circuit dispersion measure being tested once more afterwards.Now more and more higher to the requirement of service reliability, of this sort dispersion compensation solution is response line variation fast, can't ensure professional reliable transmission, must take corresponding measure to improve.
Under the situation of FEC (Forward error correction forward error correction) technology widespread usage, utilize the characteristic of FEC to realize that automatic compensation to chromatic dispersion is a kind of very economical and mode of being easy to realize.
The principle of FEC technology is to add check byte when transmitting terminal is encoded, according to the bit correlation, at receiving terminal by check bit being carried out certain calculating correcting the mistake in the code stream, thereby reach the purpose of improvement system error performance.Forward error correction (FEC) technology is as one of key technology of extra long distance optical transmission system, just be widely used in the existing network optical transmission system, in the transmission of the 40Gbit/s of 10Gbit/s signal and higher rate signal long-distance, the FEC function has all become essential option.
The FEC technology can be carried out error correction to the little error code that causes in the signals transmission, if a code word " 1 " is judged to " 0 " in the reception mistiming, it can be reduced to " 1 " by fec decoder also will add up its error correction number, add one with FEC error correction 0 bit count value is corresponding, equally, if code word " 0 " is corrected go back to " 0 " by fec decoder from " 1 " at receiving terminal, then FEC error correction 1 bit count value correspondence adds one.
After adopting the FEC technology, when receiving, system can bear lower OSNR, thereby for guaranteeing professional normal transmission because the little error code of circuit that chromatic dispersion or other factors cause is corrected by error correcting technique in the circuit transmission course.
Summary of the invention
The object of the invention is to provide the method for accurately adjusting dispersion compensation in a kind of Wave division multiplexing optical transmission system, and this method is more accurately adjusted the optical dispersion compensation in the WDM transmission system automatically based on fec decoder error correction count results.
In signals transmission, chromatic dispersion will cause the digital signal pulsewidth to broaden, like this for the Serial No. of OSNR (Optical SignalNoise Ratio Optical Signal To Noise Ratio) coding, too much chromatic dispersion may cause " 1 " pulse stretching to cause " 0 " code word on its next door to be mistaken for " 1 ", add up from the decoding that the FEC interface differential technique is collected mail number, the 1 error correction counting that produces during received signal dispersion compensation (owing to mend) not in place is more than 0 error correction counting, and the 0 error correction counting that produces when overcompensate (cross and mend) is more than 1 error correction counting.Utilize the FEC error correction this specific character we can roughly judge current received signal be in owe to mend or the benefit state, adjust the variation that its chromatic dispersion compensation quantity adapts to the circuit chromatic dispersion thereby control TDC automatically according to this information.
Utilizing FEC to carry out in the WDM transmission system of dispersion compensation adjustment, transmitting terminal OTU (optical transmission unit) unit carries out FEC coding (particular content is seen G.709 standard) to the digital electric signal that needs are sent on the circuit, after the transmission of WDM circuit, the fec decoder chip carries out fec decoder to the digital signal that receives in the receiving terminal OTU unit, because decoding chip can carry out real-time statistics to the wrong code word in the transmission signals, can determine easily in 0 error correction that in last short period section, produces and the quantity of 1 error correction.Be arranged in receiving terminal OTU unit TDC device before and be responsible for the chromatic dispersion of circuit transmission is compensated, one fixed compensation amount is arranged, can adjust its compensation rate by the CPU of TDC in circuit timing just.And the error code correction statistical information of OTU unit can be established a communications link by the cpu i/f unit of cpu i/f unit and TDC, and the CPU of TDC can realize dynamic control to the circuit chromatic dispersion compensation quantity according to the statistical information of error code correction.
Based on said system, propose accurately to adjust in a kind of Wave division multiplexing optical transmission system the method for dispersion compensation, it is characterized in that comprising the steps:
Steps A: the fec decoder module begins to carry out error correction counting, 0 error correction and the 1 error correction count value of adding up a predetermined amount of time fec decoder;
Step B: predetermined amount of time statistics judges in the current timing statistics section whether have the FEC error correction after finishing, if do not have, then changes steps A and restarts next time statistics, otherwise, change step C;
Step C: relatively 1 error correction counting is counted with 0 error correction, if 1 error correction counting judges then that greater than 0 error correction counting the current demand signal chromatic dispersion is in the benefit state of owing, changes step D, otherwise, judge that the current demand signal chromatic dispersion was in the benefit state, the commentaries on classics step e;
Step D: notice TDC module increases step value by the chromatic dispersion of setting increases chromatic dispersion compensation quantity; Change steps A then over to and restart next time statistics;
Step e: notice TDC module reduces step value by the chromatic dispersion of setting and reduces chromatic dispersion compensation quantity; Change steps A then over to and restart next time statistics.
Wherein, the statistical counting value is the 1 error correction counting and total 0 error correction counting of decoding total in this time period corresponding to the fec decoder module of all OTU unit of this TDC unit in the described steps A.
When single wavelength signals was carried out the TDC dispersion compensation, the OTU unit was corresponding one by one with described TDC unit.
When the line sharing wavelength signals was carried out the TDC dispersion compensation, a TDC unit was corresponding to a plurality of OTU unit.
After adopting this automatic dispersion compensation control technology, equipment can be by FEC the error correction counting very sensitive learn current dispersion compensation be in owe to mend or benefit state and control the TDC device and adjust chromatic dispersion compensation quantity automatically professional transmission reliability is guaranteed, avoid manual intervention, shorten dispersion compensation and adjust the time.
Description of drawings
Fig. 1 is the dispersion measure of system's actual measurement and the relation between the fec decoder error correction counting;
Fig. 2 is the transmission schematic diagram of WDM signal;
Fig. 3 is the system's receiving end configuring condition when single wavelength signals is carried out the TDC dispersion compensation;
Fig. 4 is the system's receiving end configuring condition when the line sharing wavelength signals is carried out the TDC dispersion compensation;
Fig. 5 is the mode that the error correction counting FEEDBACK CONTROL TDC of OTU unit adjusts compensation rate;
The flow chart that Fig. 6 adjusts for FEC error correction counting control TDC dispersion compensation.
Embodiment
Below in conjunction with accompanying drawing, will the specific embodiment of method involved in the present invention be described in more detail.
Method involved in the present invention mainly based on dispersion measure and the fec decoder error correction counting of system actual measurement between the relation of existence.In signals transmission, chromatic dispersion will cause the digital signal pulsewidth to broaden, like this for the Serial No. of OSNR coding, too much chromatic dispersion may cause " 1 " pulse stretching to cause " 0 " code word on its next door to be mistaken for " 1 ", add up from the decoding that the FEC interface differential technique is collected mail number, the 1 error correction counting that produces during received signal dispersion compensation (owing to mend) not in place is more than 0 error correction counting, and the 0 error correction counting that produces when overcompensate (cross and mend) is more than 1 error correction counting.Utilize the FEC error correction this specific character we can roughly judge current received signal be in owe to mend or the benefit state, adjust the variation that its chromatic dispersion compensation quantity adapts to the circuit chromatic dispersion thereby control TDC automatically according to this information.Wherein, the relation between the dispersion measure of system's actual measurement statistics and the fec decoder error correction counting as shown in Figure 1.
Circuit chromatic dispersion undercompensation 160Km when the long G652 optical fiber of 200Km adds the 40Km dispersion compensating fiber, circuit chromatic dispersion undercompensation 120Km when the long G652 optical fiber of 200Km adds the 80Km dispersion compensating fiber, chromatic dispersion is not owed to mend only and is mended when non-fiber and dispersion compensating fiber, do not have fec decoder error correction counting this moment, benefit 40Km is crossed in chromatic dispersion when only adding the 40Km dispersion compensating fiber.The OSNR that receives OTU under all line configuring situations is all more than 22dB, and the OSNR tolerance limit can reach below the 15dB under the FEC situation opening.The test Bit Error Code Statistics time is 5 minutes.The timing statistics segment length of getting can be adjusted according to actual needs.
The present invention based on the WDM transmission system as shown in Figure 2, make a start at signal, the business interface of WDM equipment OTU unit receives the service signal that needs transmission, in the OTU unit, finish processing such as performance monitoring to service signal, multiplexing or mapping, then, its built-in FEC coding chip of OTU unit by using is encoded to line signal, coded system is followed G.709 advice content, and before last circuit transmits, carry out the E/O conversion, become the certain wavelengths signal and carry out entry-line transmission behind the wavelength division multiplexing by WDM equipment.After through the fibre circuit transmission, receiving terminal compensates the circuit dispersion measure by the TDC unit, signal after the compensation is received by each OTU unit, the FEC coding module because made a start, so receiving end is corresponding the fec decoder module is arranged also, wdm system utilizes the FEC encoding and decoding to improve the OSNR redundancy of transmission system.The FEC chip can carry out real-time counting respectively and report the cpu i/f unit 0 error correction and 1 error correction in when decoding.
Wherein, for WDM transmission system shown in Figure 2, when carrying out the TDC dispersion compensation at dissimilar light signals, line configuring is different.
System's receiving end configuring condition when single wavelength signals is carried out the TDC dispersion compensation as shown in Figure 3; Each wavelength in the circuit is introduced into the TDC module and carries out dispersion compensation then by the reception of OTU unit after DMUX (Wavelength branching device) shunt, be generally used for the circuit chromatic dispersion gradient and cause receiving end to owe to mend situation or 40Gbit/s and the above two-forty signal that some wavelength is crossed benefit by some wavelength more greatly.
System's receiving end configuring condition when the line sharing wavelength signals is carried out the TDC dispersion compensation as shown in Figure 4, all wavelengths signal in the circuit carries out entering the reception of OTU unit along separate routes by DMUX behind the dispersion compensation through TDC earlier, low relatively of this application cost are mainly used in the receiving end chromatic dispersion gradient and do not cause the existing situation that owes benefit again of mending of crossing not too greatly more.
Below understand specifically the method for accurately adjusting dispersion compensation in the Wave division multiplexing optical transmission system involved in the present invention theoretical foundation and based on WDM transmission system structure, the following describes the concrete steps of this method.
Because whether FEC error correction 0,1 error correction counting crosses the relation as mentioned above that exists of mending with the TDC dispersion compensation.Because the chromatic dispersion of circuit optical fiber can not be compensated fully accurately by the dispersion compensating fiber or the module of each section, being arranged in receiving terminal OTU unit TDC device before is responsible for the chromatic dispersion of circuit transmission is compensated, in circuit timing just one fixed compensation amount is arranged, can adjust its compensation rate by the CPU of TDC.Carry out fec decoder at the signal that receives after the OTU unit is changed line side O/E, the OTU unit that has the FEC function can carry out 0 error correction and the 1 error correction counting of FEC, the error correction counting that utilizes the fec decoder chip to provide can be easy to judge that the chromatic dispersion of current circuit belonged to benefit or owed benefit, real-time statistics information to these two kinds of error correction countings can be informed the TDC unit by cpu i/f unit communication between dish as shown in Figure 5, and the error code correction statistical information of OTU unit can be established a communications link by the cpu i/f of cpu i/f and TDC, and the CPU of TDC can realize dynamic control to the circuit chromatic dispersion compensation quantity according to the statistical information of error code correction.The mode of compensation rate is adjusted in Fig. 5 explanation by the error correction counting FEEDBACK CONTROL TDC of OTU unit.The TDC unit receives after this information to adjust that stepping be adjusted chromatic dispersion compensation quantity and to be compensated by cpu i/f control TDCM according to error correction information according to default chromatic dispersion and regulates until line side FEC error correction disappears is that circuit chromatic dispersion compensation quantity and circuit dispersion measure reach coupling.Whole method of adjustment step as shown in Figure 6.
Step 501:FEC decoder module begins to carry out error correction counting, 0 error correction and the 1 error correction count value of adding up a predetermined amount of time fec decoder;
Step 502: after predetermined amount of time statistics finishes, judge whether exist the FEC error correction to occur in the current timing statistics section,, then change step 501 and restart next time statistics if do not have, otherwise, change step 503;
Step 503: judge in the error correction counting that whether 1 error correction counting is more than 0 error correction counting, if 1 error correction counting is counted more than 0 error correction, judge that then the current demand signal chromatic dispersion is in the benefit state of owing, change step 504, otherwise, judge that the current demand signal chromatic dispersion was in the benefit state, changeed step 505;
Step 504: notice TDC module increases step value by the chromatic dispersion of setting increases chromatic dispersion compensation quantity; Change step 501 then over to and restart next time statistics;
Step 505: notice TDC module reduces step value by the chromatic dispersion of setting and reduces chromatic dispersion compensation quantity; Change step 501 then over to and restart next time statistics.
For the described method step of Fig. 6, the mode of adding up described FEC error correction counting is according to the difference of concrete line configuring as shown in Figure 3, Figure 4 and different.
For the line configuring mode of Fig. 3, statistical information is from specific single OTU unit, and for the feedback system among Fig. 4, statistical information is from all OTU unit of receiving end.That is to say that with respect to Fig. 3, circuit is configured in and uses the FEC module when TDC feedback error correction information among Fig. 4, difference is and need be added up self FEC error correction information by all OTU unit of receiving end that TDC gathers the back to these statistical informations and regulates chromatic dispersion compensation quantity.
After adopting above-mentioned automatic dispersion compensating control method, equipment can be by FEC the error correction counting very sensitive learn current dispersion compensation be in owe to mend or benefit state and control the TDC device and adjust chromatic dispersion compensation quantity automatically professional transmission reliability is guaranteed, avoid manual intervention, shorten dispersion compensation and adjust the time.
The above only for explanation the specific embodiment of the present invention, and is not used in qualification the present invention, all any modifications of being done within spiritual principles of the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. accurately adjust the method for dispersion compensation in the Wave division multiplexing optical transmission system, it is characterized in that: in scheduled time slot, forward error correction (FEC) decoder module statistical decoder 1 error correction of receiving end optical transmission unit (OTU) and the counting of 0 error correction, when 1 error correction counting is counted greater than 0 error correction, adjustable chromatic dispersion compensation (TDC) unit increases chromatic dispersion compensation quantity, when 1 error correction during smaller or equal to 0 error correction, the TDC unit reduces chromatic dispersion compensation quantity
Wherein, 0 error correction is meant if a code word " 1 " is judged to " 0 " receiving mistiming, be reduced to the situation of " 1 " by fec decoder, and 1 error correction is meant if code word " 0 " is corrected back the situation of " 0 " from " 1 " by fec decoder at receiving terminal.
2. the method for accurate adjustment dispersion compensation as claimed in claim 1 is characterized in that: described increase chromatic dispersion compensation quantity is for increasing chromatic dispersion compensation quantity by one first predetermined step value.
3. the method for accurate adjustment dispersion compensation as claimed in claim 2 is characterized in that: described minimizing chromatic dispersion compensation quantity is for reducing chromatic dispersion compensation quantity by one second predetermined step value.
4. the method for accurate adjustment dispersion compensation as claimed in claim 1 is characterized in that: described statistics is for calculating corresponding to the fec decoder module of all OTU unit of this TDC unit sum that sum and 0 error correction of 1 error correction counting count of decoding.
5. the method for accurate adjustment dispersion compensation as claimed in claim 4 is characterized in that: when single wavelength signals was carried out the TDC dispersion compensation, the OTU unit was corresponding one by one with described TDC unit.
6. the method for accurate adjustment dispersion compensation as claimed in claim 4 is characterized in that: when the line sharing wavelength signals was carried out the TDC dispersion compensation, a described TDC unit was corresponding to a plurality of OTU unit.
7. accurately adjust the method for dispersion compensation in the Wave division multiplexing optical transmission system, it is characterized in that comprising the steps:
Steps A: forward error correction (FEC) decoder module begins to carry out error correction counting, 0 error correction and the 1 error correction count value of adding up a predetermined amount of time fec decoder;
Step B: after predetermined amount of time statistics finishes, judge whether exist the FEC error correction to occur in the current timing statistics section,, then change steps A and restart next time statistics if do not have, otherwise, change step C;
Step C: relatively 1 error correction counting is counted with 0 error correction, if 1 error correction counting judges then that greater than 0 error correction counting the current demand signal chromatic dispersion is in the benefit state of owing, changes step D, otherwise, judge that the current demand signal chromatic dispersion was in the benefit state, the commentaries on classics step e;
Step D: notice adjustable chromatic dispersion compensation (TDC) module increases step value by the chromatic dispersion of setting increases chromatic dispersion compensation quantity; Change steps A then over to and restart next time statistics;
Step e: notice TDC module reduces step value by the chromatic dispersion of setting and reduces chromatic dispersion compensation quantity; Change steps A then over to and restart next time statistics,
Wherein, 0 error correction is meant if a code word " 1 " is judged to " 0 " receiving mistiming, be reduced to the situation of " 1 " by fec decoder, and 1 error correction is meant if code word " 0 " is corrected back the situation of " 0 " from " 1 " by fec decoder at receiving terminal.
8. the method for accurate adjustment dispersion compensation as claimed in claim 7 is characterized in that: described steps A statistics is decoded corresponding to the fec decoder module of all optical transmission units (OTU) unit of this TDC module, and 1 error correction counting is total counts sum with 0 error correction.
9. the method for accurate adjustment dispersion compensation as claimed in claim 8 is characterized in that: when single wavelength signals was carried out the TDC dispersion compensation, the OTU unit was corresponding one by one with described TDC unit.
10. the method for accurate adjustment dispersion compensation as claimed in claim 8 is characterized in that: when the line sharing wavelength signals was carried out the TDC dispersion compensation, a TDC unit was corresponding to a plurality of OTU unit.
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| WO2006137138A1 (en) * | 2005-06-23 | 2006-12-28 | Fujitsu Limited | Wavelength dispersion compensation control method and device |
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| CN1613211A (en) * | 2002-01-04 | 2005-05-04 | 马科尼英国知识产权有限公司 | Dispersion compensation in optical communications systems |
| WO2006137138A1 (en) * | 2005-06-23 | 2006-12-28 | Fujitsu Limited | Wavelength dispersion compensation control method and device |
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