CN1061804C - Method and system for control of wavelength-division multiplex fibre-optic communication wave length - Google Patents
Method and system for control of wavelength-division multiplex fibre-optic communication wave length Download PDFInfo
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- CN1061804C CN1061804C CN96120030A CN96120030A CN1061804C CN 1061804 C CN1061804 C CN 1061804C CN 96120030 A CN96120030 A CN 96120030A CN 96120030 A CN96120030 A CN 96120030A CN 1061804 C CN1061804 C CN 1061804C
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Abstract
The present invention relates to a control method and a system for wave division multiplexing optical fiber communication wavelength, which belongs to the technical field of optical fiber communication. A fire-new method is adopted by the present invention to stably control wavelength in optical fiber communication, namely that the extraction and control information of optical power is directly outputted from a wave synthesizer in an optical fiber detection communication system, and a single-chip computer, a wavelength control plug-in component device, etc. are matched. Wavelength is conveniently, reliably and automatically controlled and adjusted in a real-time mode. The original communication system equipment is fully used by the method. The present invention has the advantages of simple maintenance, small device volume, low cost, strong intelligence performance, good controllability, good expansibility, reliability and stability, and is suitable for being popularized and applied.
Description
The invention belongs to technical field of optical fiber communication.
The rapid growth of current development of Communication Technique and communication information amount, existing and following communication system is had higher requirement, wavelength division multiplexing (WDM) optical fiber telecommunications system is just with its big capacity, the transparency, and advantages such as flexibility and low cost cause the interest that people are increasing.WDM technology (as shown in Figure 1), it is characterized in that in an optical fiber, transmit a plurality of wavelength simultaneously, and the code check of the digital signal that each wavelength carries can be comparable with single wavelength system, thereby improved total bitrate, reached the purpose of dilatation, because the existence of a plurality of wavelength, compare with single-path system, it is more important that wavelength control just seems.Do not disturb for making between them, must keep certain interval between the wavelength in twos, each wavelength also must keep certain stability respectively, in case the wavelength of system produces bigger drift, even several channels interfere with each other, and can't differentiate, and will cause the error rate of entire WDM system, the decline significantly of stability causes the deterioration significantly of systematic function.
Have very big importance just because of the wavelength control technology in wdm system, people have proposed many wavelength control schemes, for the wavelength-division multiplex system that uses discrete lasers, and existing following wavelength control schemes:
(1) adopts spectroanalysis instrument as standard of wavelength,, compare, adjust the actual wavelength of laser, make it and to set wavelength identical with the method for controlling laser temperature with the standard value of setting with its actual wavelength value that records.(2) adopt light-splitting device (as monochromator, grating etc.), make the laser wavelength value be converted into displacement, drive the PIN pipe by mechanical transmission mechanism again and record displacement and be converted into wavelength, compare with standard value, obtain the margin of error, say the word and eliminate this error to actuator.(3) adopt super chamber, by changing the long wavelength locking in chamber, wavelength is converted into specific magnitude of voltage, with the standard value comparison, the acquisition error is controlled again, here at first stably the temperature of control chamber itself and other characteristic.(4) adopt other method, as grating, wavemeter is perhaps by exocoel wavelength stabilization or the like.
Though original technology can satisfy the requirement of wavelength control, wherein most of method volume is bigger, and price is expensive, the hardware configuration complexity, power consumption is bigger, and some long-term working stability is poor, can't make plug-in card and insert in the standard rack, be not suitable for the practicability system; Though the system that perhaps has has realized very high precision with expensive equipment, in real system, do not need so high precision, cause unnecessary investment waste.The restricted influence of this link of frequency stabilization the practicalization of overall optical fiber communication wavelength-division multiplex technique.Therefore, economic, simple, the practical frequency stabilization system of design is very necessary.
The present invention has adopted a kind of and the diverse new method of prior art--gross power monitoring method on the method to the error-detecting of wavelength and automatic control and adjustment.This method changes by the total optical power of wave multiplexer output in the Direct-detection Optical fiber communication system comes each road wavelength information of extraction system, be aided with the intelligence software algorithm carries out Stability Control to each reuse wavelengths of optical WDM communication system practicability control system, its device volume is little, cost is low, stable, reliable, be applicable to actual use.
Principle of the present invention is as follows:
Close the wdm system of ripple with the grating wave multiplexer, it has fixed specific one group of passband and centre wavelength thereof, when the output light wavelength of laser drops on one of them, just can be coupled in the output optical fibre of wave multiplexer, and it is approaching more with centre wavelength, its coupling efficiency is high more, shows that the power output of wave multiplexer is big more, and receiving terminal just can better restoring signal.Otherwise if wave length shift does not add restriction, then systematic function descends greatly.Therefore, can directly measure the power output of wave multiplexer with wave multiplexer as standard of wavelength, when power output kept maximum, promptly laser output light wavelength was consistent with the centre wavelength of wave multiplexer passband.Again because the size of determined this group wavelength of wave multiplexer and being determined by its structure, it is one group of highly stable amount, very little comparatively speaking with environmental change, about one degree centigrade of 0.01nm, so if the output light of each laser is by behind the wave multiplexer, the output gross power keeps maximum, shows that then the wavelength interval also is satisfactory.Therefore, on the basis that system performance is analysed in depth, change each wavelength that needs in the prior art wavelength division multiplexing and divided the link that comes and detect respectively, compare, monitor one by one, and only need by anatomizing the gross power variation tendency, therefrom fully information extraction, be equipped with effective Based Intelligent Control and algorithm, just can realize wavelength stability control wavelength-division multiplex system.
The main feature of this method be audaciously with gross power promptly all roads power and as indication parameter, carry out the control of single channel.This is because the temperature stabilization of laser thermostat when constant, the wavelength change that variation of ambient temperature and other factors cause is a slow process, can observed total luminous power diminish i.e. wavelength shift, be the process of a long time integration, and control is to carry out in the short relatively time.Therefore, at control period, owing to once only change the thermostat of No. one laser, the temperature value of the thermostat on all the other each roads does not change, so, can suppose that the luminous power on all the other each roads is constant in the short like this control time.And controlled a road, because the temperature value of thermostat changes, the laser thermal sediment temperature changes, cause the wavelength of laser to change, thereby the power of output light behind wave multiplexer on this road is changed, as seen, at control period, in the time of such weak point, the variation of gross power has only reflected the variation of the luminous power on controlled road.
The present invention includes signal source, error detecting system and regulation and control system three parts.Wherein signal source is made of a plurality of lasers; Error detecting system is made up of wave multiplexer (10), coupler (16), detection amplifying circuit (9), A/D conversion (5) and Single Chip Microcomputer (SCM) system (4); Regulation and control system then comprises microcomputer (1), Single Chip Microcomputer (SCM) system (4) and thermostat (12) composition.Each laser 11 output wavelength λ 1, λ 2 ... λ n, each road wavelength transmits behind grating wave multiplexer synthetic a tunnel, gross power P, behind wave multiplexer 10, we insert a coupler 16, are coupled out a part of light and carry out wavelength control.The signal light power that is coupled out is that Po (P is a constant with the ratio of Po) is by detecting amplifying circuit 9, photo-signal is converted into voltage signal Vo, through low-pass filtering, send into the A/D port 5 of 8098 Single Chip Microcomputer (SCM) system 4, through A/D conversion, digital filtering, become digital quantity Do, Do is a constant with the ratio of Po, and the ratio of P and Po also is a constant, so the size of Do has reflected by total light signal gross power Po behind the wave multiplexer.The Do value that obtains is compared with the performance number of initial setting, and is if difference in the preset threshold scope, shows that the variation of gross power is little, Wavelength stabilized.If new total power value is less than the value of setting, and difference surpassed threshold range, shows that then the gross power of system descends, and wave length shift has appearred in some laser.At this moment, the start-up control algorithm, the one tunnel one the tunnel controls.To each road, be the target temperature by the thermostat 12 that changes this road laser 11 specifically, the output light wavelength of laser is the function of temperature, and temperature change causes this road wavelength shift, just changes by this road luminous power behind the wave multiplexer.Thereby cause that also gross power changes.Earlier to wherein one the tunnel carrying out temperature control, until the gross power control to maximum.Use next road of same algorithm controls again, all roads come back to starting point after all controlling and going over, and upgrade initial set value, continue to monitor the fluctuation of total optical power.Control algolithm is maximizing automatically, finally fluctuates in the small scope near maximum.
Be to strengthen flexibility, SCM Based wavelength control system can with microcomputer communication.By microcomputer, can change the step-length of each intensification or cooling, change the road of control, change various threshold values; By Single Chip Microcomputer (SCM) system, microcomputer can communicate with thermostat 12: the various states that can obtain thermostat; According to the current state of thermostat, artificial or adjust the pid parameter of thermostat by Automatic Program, make it to reach best.
Again control algolithm is once illustrated below:
For a complete supervisory control system, wavelength control is not only arranged, also have the monitoring of other amount.In fact, wavelength control system is the part of supervisory control system, and by communicating by letter with other monitoring module, it can obtain more parameter, thereby improves the performance of wavelength control.In optical fiber telecommunications system, each laser all has detection backlight, uses this parameter, just can extrapolate the size of laser emission luminous power, also just can know all lasers emission luminous powers with.Wavelength control system obtains this information, as parameter, just can compensate for laser launches noise that the variation of luminous power cause with this parameter with the average light power that sees through wave multiplexer and its ratio.Among the present invention, adopted above thinking.And, owing to utilized detection backlight, when a certain road occurring and close, can not have a significant impact wavelength control yet, detection backlight can tell wavelength control system which has been unglazed, wavelength control system just can not go to control this road again.
Other also have been used for control algolithm with quadrat method.During each control, all to carry out random perturbation one time, thereby judge the direction of temperature control wavelength.If this disturbance acts on a road of wavelength departure, may cause to add on the upper side partially.System at first is the step sizes of control disturbance to this way to solve the problem, making initial disturbance is a perturbation, next is the wavelength change direction to be estimated as far as possible, this perturbation probability in the right direction is uprised, first, write down long-time wavelength change situation, new wavelength change is carried out linear prediction with these data; Second, wavelength change is relevant with many factors, utilize the situation of change of some factor that other watch-dog provides, handle with means such as theory analysis or empirical equations, just can judge wavelength change by the variation of these factors, the direction of perturbation is undertaken by judged result, and correct probability has raising.By adaptive step control, make precision higher simultaneously.
Embodiments of the invention:
Wavelength control system is that main body realizes monitoring and controlled function with the wavelength control plug-in unit, and as shown in Figure 4, its circuit diagram as shown in Figure 3.Circuit is by control section, communications portion, optical detection part branch, A/D conversion portion, the information storage part composition that grades.The input of this device, output socket are: A socket 17 is communicated by letter with thermostat; B socket 18 and host computer communication exchange monitor message; C socket 19 is the input of wave multiplexer light.It is convenient and practical that this device is easy to carry whole system.
Wavelength control insert arrangement of the present invention is engaged in my breadboard 8 tunnel 240 kilometers division multiplex fibre-optic communication wave experimental systems and tries out, and has realized good wavelength control function.
In a word, the major advantage of this device is that cost is low, and volume is little, and is low in energy consumption, simple in structure, and reliability is higher, Needn't dispose the CF standard, safeguard simply, all be commercial devices, is fit to batch production, intelligent strong, Controllability and favorable expandability. Can make plug-in card, insert the standard rack operation.
Figure of description:
Fig. 1 wavelength-division multiplex system schematic diagram
Fig. 2 wavelength control system principle
1-microcomputer 2-serial port
3-RS-232 extended serial mouth 4-8098 Single Chip Microcomputer (SCM) system
5-A/D conversion 6-8098 single chip communication mouth
7-RAM 8-ROM
9-detects amplifying circuit 10-wave multiplexer
The thermostat of 11-laser 12-laser
13-RS-422 serial port 14-detection backlight
The parameter 16-coupler that 15-is relevant with wavelength change
Fig. 3 wavelength control insert arrangement each several part circuit diagram
Fig. 4 is used for the outside drawing of the wavelength control device of 8 tunnel 240 kilometers optical fibre wavelength-division multiplex experimental systems
Fig. 4 wavelength control insert arrangement embodiment
The 17-A socket is communicated by letter with thermostat
The 18-B socket is communicated by letter with host computer, exchange monitoring information
The 19-C socket, the input of wave multiplexer light
Claims (4)
1, a kind of wavelength-division multiplex fibre-optic communication wave length control method:
(1) a plurality of lasers are signal source, send a plurality of wavelength;
(2) the gross power monitoring method is adopted in the detection of wavelength error, make the different wave length of a plurality of laser outputs, import wave multiplexer (10) simultaneously, measure its output total optical power as indication parameter, when the total optical power value is set the luminous power initial value less than certain, and when difference surpasses threshold range, regulate the thermostat (12) of each road laser successively, recover total optical power to set point.
2, a kind of wavelength-division multiplex fibre-optic communication wave length control system comprises signal source, error detecting system and regulation and control system, it is characterized in that:
(1) signal source is by a plurality of laser constitutions, and a plurality of lasers send a plurality of wavelength;
(2) error detecting system is made up of wave multiplexer (10), coupler (16), detection amplifying circuit (9), A/D conversion (5), Single Chip Microcomputer (SCM) system (4); The wavelength of a plurality of laser outputs, after entering wave multiplexer (10) synthetic a tunnel simultaneously, make part light enter coupler (16), the signal light power that is coupled out is Po, and amplifying circuit (9) is converted into voltage signal Vo after testing, enters Single Chip Microcomputer (SCM) system (4) after the low-pass filtering, through A/D conversion becoming digital quantity Do, Do and initial set value relatively if difference surpasses the setting threshold scope, represent that then wavelength change surpasses set point;
(3) regulation and control system is made up of microcomputer (1), Single Chip Microcomputer (SCM) system (4) and thermostat (12), when numerical variable Do and initial set value comparison, when its difference surpasses the setting threshold scope, monitoring module by Single Chip Microcomputer (SCM) system (4) communicates microcomputer (1) and thermostat (12), the start-up control algorithm, automatically regulate thermostat (12) to optimum state, in time control each road wavelength change.
3, according to the described wavelength-division multiplex fibre-optic communication wave length control system of claim 2, it is characterized in that: each laser all is furnished with the total parameter of checkout gear backlight (14) Information Monitoring at any time in the wavelength control system, input Single Chip Microcomputer (SCM) system (4) by intelligent algorithm, is optimized and revised control procedure.
4, according to the described wavelength-division multiplex fibre-optic communication wave length control system of claim 2, it is characterized in that:
(1) wavelength control insert arrangement circuit is graded and is formed by the control section, communications portion, optical detection part branch, the A/D conversion portion information storage part that detect in the control system, and this device is easy to carry whole system, and is convenient and practical;
(2) the wavelength control insert arrangement is realized communicating by letter with the wavelength monitoring control section by input, output socket, and wherein the A socket is communicated by letter with thermostat; The B socket is communicated by letter with host computer, exchange monitoring information: the input of C socket wave multiplexer light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96120030A CN1061804C (en) | 1996-10-11 | 1996-10-11 | Method and system for control of wavelength-division multiplex fibre-optic communication wave length |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96120030A CN1061804C (en) | 1996-10-11 | 1996-10-11 | Method and system for control of wavelength-division multiplex fibre-optic communication wave length |
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| Publication Number | Publication Date |
|---|---|
| CN1153433A CN1153433A (en) | 1997-07-02 |
| CN1061804C true CN1061804C (en) | 2001-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN96120030A Expired - Fee Related CN1061804C (en) | 1996-10-11 | 1996-10-11 | Method and system for control of wavelength-division multiplex fibre-optic communication wave length |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039149B (en) * | 2007-02-12 | 2011-06-08 | 华为技术有限公司 | Wavelength aligning method and system |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100765001B1 (en) * | 2001-07-10 | 2007-10-09 | 엘지노텔 주식회사 | multi-channel optical wavelength locking equipment |
| CN101057424B (en) * | 2005-02-22 | 2010-04-14 | 中兴通讯股份有限公司 | Device and method for collectively monitoring a wavelength in DWDM system |
| CN1819502B (en) * | 2006-03-10 | 2012-09-05 | 北京千禧恒业科技有限公司 | Wave-length controlling circuit of light communication wavelength division multiplexing |
| CN101110643B (en) * | 2006-07-21 | 2011-07-20 | 中兴通讯股份有限公司 | System and method for implementing wavelength centralized adjustment and control |
| US8744265B2 (en) * | 2007-04-27 | 2014-06-03 | Futurewei Technologies, Inc. | Passive optical network with partially-tuned lasers |
| CN109814223A (en) * | 2019-02-26 | 2019-05-28 | 武汉电信器件有限公司 | A kind of WDM device and method for optical module |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2170370A (en) * | 1985-01-24 | 1986-07-30 | British Telecomm | Wavelength division multiplexed networks |
| EP0489525A2 (en) * | 1990-12-06 | 1992-06-10 | Gec-Marconi Limited | Improvements relating to optical sensing systems |
| JPH08251105A (en) * | 1994-09-26 | 1996-09-27 | Nippon Telegr & Teleph Corp <Ntt> | Wavelength monitor device |
-
1996
- 1996-10-11 CN CN96120030A patent/CN1061804C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2170370A (en) * | 1985-01-24 | 1986-07-30 | British Telecomm | Wavelength division multiplexed networks |
| EP0489525A2 (en) * | 1990-12-06 | 1992-06-10 | Gec-Marconi Limited | Improvements relating to optical sensing systems |
| JPH08251105A (en) * | 1994-09-26 | 1996-09-27 | Nippon Telegr & Teleph Corp <Ntt> | Wavelength monitor device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039149B (en) * | 2007-02-12 | 2011-06-08 | 华为技术有限公司 | Wavelength aligning method and system |
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| Publication number | Publication date |
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| CN1153433A (en) | 1997-07-02 |
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