CN102223175B - Method for optimizing receiving parts of high-speed optical module - Google Patents
Method for optimizing receiving parts of high-speed optical module Download PDFInfo
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- CN102223175B CN102223175B CN2011101564703A CN201110156470A CN102223175B CN 102223175 B CN102223175 B CN 102223175B CN 2011101564703 A CN2011101564703 A CN 2011101564703A CN 201110156470 A CN201110156470 A CN 201110156470A CN 102223175 B CN102223175 B CN 102223175B
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Abstract
The invention provides a method for optimizing receiving parts of a high-speed optical module, relating to the field of optical transmission systems. The method comprises the following steps: (1) starting initialization, setting a preset value of each device in an optical transmission system, and setting relative time delay of a delay interferometer; (2) detecting whether information of optical signals received by a receiving end meets the preset values; executing the next step if the information meets the preset values; and exiting the procedure if the information does not meet the preset values; (3) acquiring a plurality of frames to carry out accurate detection and judgment, and executing to exit the procedure or adjust the procedure in accordance with the judgment result; and (4) after the adjustment procedure is finished completely, executing the adjustment of a demultiplexer and then exiting the procedure. The method has low requirements for the optical transmission system, and is utilized to solve the problem that re-adjustment is needed as an alarm still occurs after the optical module is optimized, eliminate re-electrification or re-adjustment of a board card, shorten adjusting time and promote error code performance of the optical transmission system.
Description
Technical field
The present invention relates to the optical transmission system field, is specifically a kind of optimization method of high-speed optical module receiving unit.
Background technology
Along with the continuous growth of the miscellaneous services such as speech and data, for the capacity of transmission network, huge challenge has been proposed, how to grow distance, the transmission of jumbo business is being carried out research widely.The research of various advanced modulation patterns is wherein important branches, along with going deep into of phase-modulation transmission system research, it is found that it has excellent light signal and noise proportional sensitivity.
Senior phase modulation pattern is a kind of in the phase-modulation transmission system, and the phase difference of former and later two bits of general using carrys out coded message, and implementation commonly used is: when former and later two bit phase were constant, representative transmitted bit 1; When former and later two bit phase had the upset of π, representative transmitted bit 0.In order at receiving terminal, the phase information demodulation to be made as to amplitude information, namely for the rendering data signal, in receiver, adopt a kind of device (as Mach-Zehnder interferometer) that is referred to as delay interferometer.Light signal is divided into two-way in delay interferometer transmits, wherein a road with respect to an other road postpone one relative time delay Δ T, and finally reconfigure these two parts, according on this transmitter, being modulated onto the phase place on light signal, realize interfering long or interference mutually to disappear mutually.Traditional theory thinks, the time path difference Δ T while just being 1 bit, time delay demodulation performance the best.New experiment showed, in the transmission system that has chromatic dispersion and polarizing coating dispersion also arranged, and time delay when Δ T is slightly less than a bit, can improve certain aspect of system such as accepting the performances such as sensitivity, error performance, chromatic dispersion tolerance limit.In therefore accurate control lag interferometer, the Δ T in relative time delay of two paths of signals, have important meaning for systematic function.
In addition, in optical transmission system, also need to regulate the parameters such as decision threshold in demodulation multiplexer and phase deviation, make optical transmission system reach best performance.In traditional optical module, after the adjusting program is carried out in process or is finished, sometimes can there be the LOF alarm in optical transmission system always, after board need to being re-powered or reset, regulate once again, it is normal that optical transmission system just can recover, the adjusting time that so just need to grow, after regulating, the error performance of optical transmission system is good not, regulates flow process and requires meticulousr to optical transmission system; In addition, in the adjustment process of multiplexer, there will be defect, as inadequate as the optical transmission system performance collection, or regulate direction misjudgment etc.
Summary of the invention
For the defect that exists in prior art, the object of the present invention is to provide a kind of optimization method of high-speed optical module receiving unit, requirement to optical transmission system is wider, after improving optical module optimization, still occur that alarm causes the problem that need to readjust, reducing board re-powers or readjusts, shorten the adjusting time, promote the error performance of optical transmission system.
For reaching above purpose, the technical scheme that the present invention takes is: a kind of optimization method of high-speed optical module receiving unit, comprise the steps: that (1) starts initialization, the preset value of each device in optical transmission system is set, be set the relative time delay of delay interferometer simultaneously; (2) whether the information that detects the light signal that receiving terminal receives meets preset value, if, enter next step, if not, quit a program; (3) gather some frames and accurately detect judgement, according to judged result, carry out and quit a program or the adjusting program; (4), after adjusting program all completes, after carrying out the demodulation multiplexer adjusting, quit a program.
On the basis of technique scheme, while in described (3), often once gathering some frames, extract at twice the different information of frame, then times of collection is deposited in to a counter, then gather some frames next time.
On the basis of technique scheme, in described (3), main judgement is according to being the error rate of optical transmission system, when the error rate lower than 10e
-6The time, quit a program; When there is the LOF alarm in optical transmission system, carry out Primary regulation program in relative time delay; When the error rate higher than 10e
-6And, when the LOF alarm does not appear in optical transmission system, carry out secondary adjusting in relative time delay program.
On the basis of technique scheme, described execution demodulation multiplexer regulate with relative time delay Primary regulation program, relative time delay secondary to regulate the step of program identical, described execution demodulation multiplexer is regulated and is comprised decision threshold adjusting and phase offset adjustments.
On the basis of technique scheme, described relative time delay Primary regulation program, relative time delay secondary to regulate the step of program identical, and the two is all to regulate for parameter identical in described delay interferometer.
On the basis of technique scheme, after described delay interferometer is carried out Primary regulation program in relative time delay, again carry out secondary adjusting in relative time delay program.
On the basis of technique scheme, described relative time delay, the Primary regulation program comprised: first determine to regulate step-length and direction, optical transmission system is added up the system data collection, then carry out the proportion integration differentiation search and realize the dynamic step-length of regulating, through the bubbling search, mark maximum again, finally by crossing feedback ratio and pinpoint circulation, determine to regulate the optimum value of parameter.
On the basis of technique scheme, described adjusting step-length and current photoelectric parameter have certain functional relation, described function comprise proportional, integration item and differential term and, there are inverse relation in described proportional and the current system error rate, there is the relation of direct ratio in the accumulation of integration item and error rate of system, and there is inverse relation in the variation speed of differential term and error rate of system.
Beneficial effect of the present invention is:
By at the optical transmission system Counter, the number of times of system data collection statistics being done to accumulative total, and such process is repeated to several times, the data acquisition of by large sample, repeatedly counting, the performance that clear and definite optical transmission system is present, the adjusting flow process of taking accordingly will be meticulousr, and is more pointed, therefore will regulate failed probability and be down to minimum, improve and the problem that readjusts occurs, reduce board and re-power or readjust.
In addition, by adoption rate integral differential (Proportion Integration Differentiation, PID) mode of search and bubbling search combination is regulated, because step-length is dynamically to follow the tracks of according to the variation of the error rate, the dynamic step-length of regulating can be located more rapidly when guaranteeing precision, when guaranteeing degree of regulation, greatly shortened the adjusting time, promote the error performance of optical transmission system, by the circulation feedback ratio after, guarantee that the system parameters regulate is all optimal value for whole system.
The accompanying drawing explanation
Fig. 1 is the overview flow chart of the optimization method of high-speed optical module receiving unit of the present invention;
Fig. 2 be in Fig. 1 relative time delay the Primary regulation program flow chart;
Fig. 3 gathers the flow chart that some frames accurately detect judgement in Fig. 1;
Fig. 4 searches for by PID the schematic diagram of searching for optimum value with bubbling in Fig. 2;
Fig. 5 is pinpoint flow chart in Fig. 2.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, the optimization method of described high-speed optical module receiving unit comprises step:
(1) start initialization, the preset value of each device in optical transmission system is set, be set the relative time delay (hereinafter to be referred as Δ T) of delay interferometer simultaneously.
(2) sensed light signal, judge whether the information of the light signal that receiving terminal is received meets preset value, if, represent that receiving terminal is received and meet default light signal, enter next step; If not, illustrate that receiving terminal do not receive manageable information, directly quit a program.
(3) gather some frames and accurately detect judgement, according to judged result, carry out and quit a program or the adjusting program.Main judgement is according to being the error rate of optical transmission system, and in the ability example, judged result comprises following three kinds: when the error rate lower than 10e
-6The time, can be considered as optical transmission system quite in condition, execution quits a program; When there is the LOF alarm in optical transmission system, be considered as the optical transmission system situation very bad, carry out Δ T Primary regulation program; When the error rate higher than 10e
-6And when the LOF alarm did not appear in optical transmission system, the optical transmission system situation, between between the two above, carried out Δ T secondary and is regulated program.After wherein carrying out Δ T Primary regulation program, need to then carry out Δ T secondary and regulate program, further to optimize.In other embodiments, can determine according to the parameters of optical transmission system the critical value of the error rate, the error rate of judgement is such as 10e usually
-10.
(4), after adjusting program all completes, after carrying out the demodulation multiplexer adjusting, quit a program.
As shown in Figure 2, be the flow chart of Δ T Primary regulation program.At first determine to regulate step-length and direction, determine that optical transmission system gathers statistics to system data according to comprising frame information and other photoelectric parameter.Then carry out the PID search, to realize regulating dynamically step-length, between described adjusting step-length and current photoelectric parameter (being current error amount), has certain functional relation, this function comprise proportional, integration item and differential term and, there are inverse relation in described proportional and the current system error rate, be that optical transmission system bit error rate is high, step-length wants respective settings little; If optical transmission system bit error rate is low, step-length is set large.There is the relation of direct ratio in the accumulation of integration item and error rate of system, if the error rate is always very high, step-length is set as greatly; If the error rate descends very soon from high to low, step-length is set little.There is inverse relation in the variation speed of differential term and error rate of system, and very slow if the error rate changes, step-length is set as greatly; If it is very fast that the error rate changes, step-length is set as little.Then through the bubbling search, mark maximum, so-called bubbling search, be two more adjacent successively numbers, to count and be placed on front greatly, decimal is put behind, from whole data, searching out maximum or minimum value, and all the time by current search to maximum be labeled as the best.Finally by crossing feedback ratio and pinpoint circulation, program has namely found current optimum value of regulating parameter, and carrying out quits a program gets final product.
Described Δ T Primary regulation program, Δ T secondary are regulated program and demodulation multiplexer, and to regulate three's step identical, demodulation multiplexer is regulated and is comprised decision threshold adjusting and phase offset adjustments, it is all to regulate for parameter identical in delay interferometer that T-adjusting program of Δ and Δ T secondary are regulated program, and the foundation of only regulating is different.
As shown in Figure 3, described step (3) gathers some frames and accurately detects in the process of judgement, and optical transmission system is provided with the number of times that a counter is realized the accumulative total store frame information, and the instruction of control assembly in can the response light transmission system.After described control assembly is assigned sample command, memory unit in optical transmission system starts to gather for the first time some frames (the concrete comprehensive memory unit capacity of number of times and practical adjustments effect are determined), after gathering, control assembly can carry out the extraction of a frame information, progressively extraction and analysis frame information 1 and extraction and analysis frame information 2, due to frame, contain the information of multiple reaction optical transmission system performance, such as LOF, how various types of error codes distribute etc., therefore taked the step of extracted twice analysis frame information.Due to every frame, be only a sample of systematic function again, from statistical theory, can know, the more many performance conditions that more can reflect really system of sample size.Therefore after extraction and analysis frame information 2, carry out the some frames of collection next time, such cyclic process repeats repeatedly, makes a large amount of frame sample that collects enough reflect system status.The number of times of described execution is determined according to the practical adjustments effect, when effect reaches default, can stop.
As Fig. 2, shown in Figure 4 and Figure 5, above-mentioned steps is further illustrated, in Fig. 4, abscissa represents the voltage V of delay interferometer, the n reciprocal of the ordinate representative system error rate, obvious Optimum Point Position A point in figure, but B wherein, C, D point are also optimum values in minizone separately, incomplete regulative mode may cause searching these points and it is judged as to optimum value.Fig. 6 is pinpoint flow chart, after the bubbling search is complete, determined current optimum value place, the upper adjusting several times that continue in this basis, described number of times can be determined according to step-length and experiment effect, for example 6 times, and will continue the value of regulating and carry out feedback ratio with current optimum value, if the value that continues after the adjusting several times is better talked about than the relative optical communication system of currency, namely the system error performance is better, through feedback ratio after, current optimum value will be replaced.Then proceed the bubbling search in Fig. 2, again carry out accurate positioning action, so loop nesting has just guaranteed that program finally can rest on the optimum value A point in Fig. 5, rather than B, C, D point.
Below by a specific embodiment, describe the present invention in detail.
In optical transmission system, after optical module receiving unit power-up initializing is complete, just starts sensed light signal and whether exist, suppose the luminous power boundary is arranged on-20dBm, if luminous power detected, be-30dBm can think that signal does not possess treatment conditions, quitting a program in execution graph 1; If luminous power detected greater than-20dBm, enter the some frames of following collection and accurately detect determining program, memory unit starts the samples storage frame, in the ability example, once can gather and store 100 frames, after collection completed, control assembly started to extract the information of 100 frame the insides, be extraction and analysis frame information 1 and extraction and analysis frame information 2 steps in corresponding diagram 3, after depositing the information number of times of extraction in counter, repetitive cycling sampling sampling again, for example circulate 200 times, then according to frame information 1 and the frame information 2 of counter accumulative total, adjudicate.
After judgement, produce three kinds of results, when the error rate lower than 10e
-6The time, can be considered as optical transmission system quite in condition, execution quits a program; When there is the LOF alarm in optical transmission system, be considered as the optical transmission system situation very bad, carry out Δ T Primary regulation program; When the error rate higher than 10e
-6And when the LOF alarm did not appear in optical transmission system, the optical transmission system situation, between between the two above, carried out Δ T secondary and is regulated program.After supposing the present embodiment judgement, be the third result, carry out time delay Δ T secondary and regulate program.First determine initial step length and direction, then the error performance parameter in acquisition frame information starts the PID search, the PID search can be determined roughly an optimum range roughly, then in this little segment limit, start bubbling search and accurately location circulation, this cycles through to search after current optimum value and continues the search several times and feedback ratio guarantees that the value that searches is best.
The present invention is not limited to above-mentioned execution mode, for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, within these improvements and modifications also are considered as protection scope of the present invention.The content that is not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (6)
1. the optimization method of a high-speed optical module receiving unit, is characterized in that, comprises the steps:
(1) start initialization, the preset value of each device in optical transmission system is set, be set the relative time delay of delay interferometer simultaneously;
(2) whether the information that detects the light signal that receiving terminal receives meets preset value, if, enter next step, if not, quit a program;
(3) gather some frames and accurately detect judgement, according to judged result, carry out and quit a program or the adjusting program;
(4), after adjusting program all completes, after carrying out the demodulation multiplexer adjusting, quit a program;
While in described (3), often once gathering some frames, extract at twice the different information of frame, then times of collection is deposited in to a counter, then gather some frames next time; In described (3), main judgement is according to being the error rate of optical transmission system, when the error rate lower than 10e
-6The time, quit a program; When there is the LOF alarm in optical transmission system, carry out Primary regulation program in relative time delay; When the error rate higher than 10e
-6And, when the LOF alarm does not appear in optical transmission system, carry out secondary adjusting in relative time delay program.
2. the optimization method of high-speed optical module receiving unit as claimed in claim 1, it is characterized in that: described execution demodulation multiplexer regulate with relative time delay Primary regulation program, relative time delay secondary to regulate the step of program identical, described execution demodulation multiplexer is regulated and is comprised decision threshold adjusting and phase offset adjustments.
3. the optimization method of high-speed optical module receiving unit as claimed in claim 2, it is characterized in that: described relative time delay Primary regulation program, relative time delay secondary to regulate the step of program identical, and the two is all to regulate for parameter identical in described delay interferometer.
4. the optimization method of high-speed optical module receiving unit as claimed in claim 3, is characterized in that: after described delay interferometer is carried out Primary regulation program in relative time delay, again carry out secondary adjusting in relative time delay program.
5. the optimization method of high-speed optical module receiving unit as claimed in claim 3, it is characterized in that: described relative time delay, the Primary regulation program comprised: first determine to regulate step-length and direction, optical transmission system gathers and adds up system data, then carry out the proportion integration differentiation search and realize the dynamic step-length of regulating, through the bubbling search, mark maximum again, finally by crossing feedback ratio and pinpoint circulation, determine to regulate the optimum value of parameter.
6. the optimization method of high-speed optical module receiving unit as claimed in claim 5, it is characterized in that: described adjusting step-length and current photoelectric parameter have certain functional relation, described function comprises the summation of proportional, integration item and differential term, there are inverse relation in described proportional and the current system error rate, there is proportional relation in the accumulation of integration item and error rate of system, and there is inverse relation in the variation speed of differential term and error rate of system.
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| CN116032377A (en) * | 2021-10-26 | 2023-04-28 | 华为技术有限公司 | Method for controlling power consumption of optical network system, optical network system and communication equipment |
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