CN102820921A - Method for improving optical fiber OTDR (optical time domain reflectometry) test performance - Google Patents
Method for improving optical fiber OTDR (optical time domain reflectometry) test performance Download PDFInfo
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- CN102820921A CN102820921A CN2012103379383A CN201210337938A CN102820921A CN 102820921 A CN102820921 A CN 102820921A CN 2012103379383 A CN2012103379383 A CN 2012103379383A CN 201210337938 A CN201210337938 A CN 201210337938A CN 102820921 A CN102820921 A CN 102820921A
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Abstract
The invention discloses a method for improving the optical fiber OTDR (optical time domain reflectometry) test performance. A heating component is arranged on a laser in an OLT (optical line terminal) optical module; and when an OTDR module in the OLT optical module tests the optical fiber OTDR performance, the heating component is intermittently heated and transfers the heat to the laser to change the laser temperature. According to the invention, the laser is heated to change the laser wavelength so that the laser wavelength fluctuates in a small range, and the noise influence of the intrinsic optical interference of optical fiber on the optical fiber under OTDR test is greatly reduced so as to improve the OTDR test performance, so the method is simple and convenient.
Description
Technical field
The present invention relates to the optical communication technique field, particularly a kind of method of improving optical fiber OTDR test performance.
Background technology
Along with the development of optical fiber communication, the especially development of EPON, advantages such as it is big with capacity, transmission range length, lower cost, full-service support become hot technology.EPON is meant among the ODN (optical distribution) and does not contain any electronic device and electronic power supply that ODN all is made up of optical branching device passive devices such as (Splitter).An EPON comprises an optical line terminal (OLT) that is installed on console for centralized control, and a collection of supporting optical network unit that is installed on customer site (ONUs).Optical distribution between OLT and ONU (ODN) has comprised optical fiber and passive optical splitters or coupler.In the current information age, optical fiber cable is destroyed the communication accidental interruption that causes will produce immeasurable loss, in order to reduce the loss, need the abnormal conditions in the monitoring fibre circuit, in time report to the police, and drop to minimum to loss.In order to ensure reliability of information transmission; Precision instrument---optical time domain reflectometer (Optical Time Domain Reflectometer) carries out real-time monitoring to the performance of fibre circuit in general employing, to judge incidents such as fiber lengths, optical fiber attenuation, fused fiber splice point, connector or fibercuts position.In the prior art OTDR technology is integrated in the OLT optical module, has reduced the cost of existing independent OTDR tester largely, and increase wiring can for existing passive optical-fiber network Access Network.Yet when carrying out optical fiber OTDR test with the OLT optical module that is integrated with the OTDR function, there is noise effect in the interference of light that optical fiber itself exists to tested optical fiber, thereby has influenced optical fiber OTDR test performance.At present also there is not a kind of method simply and easily to eliminate the influence of the interference of light to the OTDR test performance.
Summary of the invention
The objective of the invention is to overcome existing above-mentioned deficiency in the prior art, a kind of method of testing of improving optical fiber OTDR test performance simply and easily is provided.
In order to realize the foregoing invention purpose, the invention provides following technical scheme:
A kind of method of improving optical fiber OTDR test performance; A heater block is set on the laser in the OLT optical module; OTDR module in the OLT optical module is carried out in the optical fiber OTDR performance test process; Said heater block is interrupted heating, and heater block is passed to laser with heat, makes laser temperature change.
Preferably, said heater block is a resistance.
According to embodiments of the invention, said resistance is arranged on laser inside, and through this resistance break-make electricity is made its heating, the resistance heat is directly passed to laser, makes laser temperature change in the OTDR test process.
According to embodiments of the invention; Said resistance is arranged on the laser outside; On pcb board, the one side and the laser of pcb board welding resistance fit tightly through thermal paste resistance welded, in the OTDR test process through resistance break-make electricity is made its heating; The resistance heat is passed to laser through thermal paste, makes laser temperature change.
According to embodiments of the invention; Said resistance is arranged on the laser outside; On adagio, the one side and the laser of the non-welding resistance of adagio fit tightly resistance welded, in the OTDR test process through resistance break-make electricity is made its heating; The resistance heat is passed to laser through adagio, makes laser temperature change.
Preferably, said laser is a Distributed Feedback Laser.
Compared with prior art, beneficial effect of the present invention:
The present invention adopts the method to the laser heating to change laser wavelength; Fluctuation among a small circle takes place in laser wavelength; Reduce the noise effect of the interference of light of optical fiber existence itself greatly, thereby improve the OTDR test performance the optical fiber of OTDR test, simple and convenient; Improve optical fiber OTDR integrated testability performance, test result is more accurate.
Description of drawings:
Fig. 1 is for adopting the preceding OTDR test curve figure of the inventive method.
Fig. 2 is the OTDR test curve figure after employing the inventive method.
Fig. 3 is the internal circuit block diagram of the OLT optical module of existing integrated OTDR module.
Embodiment
Below in conjunction with Test Example and embodiment the present invention is made further detailed description.But should this be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment, allly all belong to scope of the present invention based on the technology that content of the present invention realized.
The method of improving optical fiber OTDR test performance of the present invention; A heater block is set on the laser in the OLT optical module; OTDR module in the OLT optical module is carried out in the optical fiber OTDR performance test process; Said heater block is interrupted heating, and heater block is passed to laser with heat, makes laser temperature change.
Said heater block is a resistance.Said laser preferentially adopts Distributed Feedback Laser.For the interference of light that reduces to cause influence to the OTDR test performance by optical fiber itself; In the process of test OTDR; Need the wavelength of laser that certain fluctuation is arranged, the implementation method of the present invention's employing is in test OTDR process, to make the temperature of laser that certain variation arranged for this reason, and the wavelength of Distributed Feedback Laser can have the increase of certain limit along with temperature rises; In the process of test OTDR; Laser wavelength has fluctuation among a small circle, can effectively reduce the noise effect of the interference of light to the fiber segment of OTDR test curve, thereby improves optical fiber OTDR test performance.
Embodiment 1:
Said resistance is arranged on laser inside, and through this resistance break-make electricity is made its heating, the resistance heat is directly passed to laser, makes laser temperature change in the OTDR test process.The advantage that adopts this this kind mode is the pin configuration that can not influence normal laser, outside connects used adagio it goes without doing any variation, and is easier to operation at optical module production and assembly time ratio, reduces risks.
Embodiment 2:
Said resistance is arranged on the laser outside; Resistance welded on pcb board; The one side and the laser of pcb board welding resistance fit tightly through thermal paste; Through resistance break-make electricity is made its heating, the resistance heat is passed to laser through thermal paste, makes laser temperature change in the OTDR test process.The advantage that adopts this kind mode is that resistance can fit tightly with laser, and laser is given in the conduction that the heat of resistance can be faster and better.
Embodiment 3:
Said resistance is arranged on the laser outside; On adagio, the one side and the laser of the non-welding resistance of adagio fit tightly resistance welded, in the OTDR test process through resistance break-make electricity is made its heating; The resistance heat is passed to laser through adagio, makes laser temperature change.The more convenient operation of welding resistance when adopting the advantage of this kind mode to be production and assembly, and saved the insulating radiation glue between adagio and laser.
Fig. 3 is the internal circuit block diagram of the OLT optical module of existing integrated OTDR module.Pulse driving circuit in the OTDR module in this OLT optical module is modulated pulse signal to the data-signal of driver output; Drive laser is luminous then; Through an optical branching device Splitter (is the optical splitter of 1:9 like splitting ratio), export after the light signal of 1490nm closed ripple with wavelength division multiplexer WDM.The light that this OLT optical module receives comprises the 1490nm light that 1310nm light that ONT Optical Network Terminal ONT sends and fiber reflection are returned, and through wavelength division multiplexer WDM partial wave, receiver 1 receives 1310nm light successively, and limiting amplifier amplifies the back and exports; The 1490nm light that fiber reflection is returned is through the 1:9 optical branching device; Convert the signal of telecommunication into through receiver 2; Signal acquisition circuit in the OTDR module is gathered this signal of telecommunication; Then pulse generation and the signal processing circuit in the OTDR module handled acquired signal, and the data after the processing output to outer computer and carry out further processes and displays.Specify the test process of test 10km optical fiber below in conjunction with Fig. 3.
During test; Optical fiber is connected with the OLT optical module; The pulse driving circuit of OTDR inside modules produces light pulse signal in the OLT optical module, and this light pulse signal gets in the optical fiber through laser, optical branching device Splitter, wavelength division multiplexer successively, and the 1490nm light that fiber reflection is returned is through the 1:9 optical branching device; Convert the signal of telecommunication into through receiver 2; Signal acquisition circuit in the OTDR module is gathered this signal of telecommunication, obtains the data of a series of sampled points, and each data is all represented the reflected optical power value of certain point in the optical fiber.The distance of going into end is as abscissa, and the reflected optical power value of each sampled point obtains the relation of optical fiber attenuation and length as ordinate, thereby reflects optical fiber properties to be tested.For the interference of light that reduces to be caused by optical fiber itself influence to the OTDR test performance, in test process, the present invention is employed on the laser in the OLT optical module resistance is set; Through this resistance break-make electricity is made its heating; The resistance heat is directly passed to laser, makes laser temperature change in test process, make the temperature of laser that certain variation is arranged, and the wavelength of Distributed Feedback Laser can have the increase of certain limit along with temperature rises; In test process; Laser wavelength has fluctuation among a small circle, can effectively reduce the noise effect of the interference of light to the fiber segment of OTDR test curve, thereby improves optical fiber OTDR test performance.
Fig. 1 and Fig. 2 provide before employing this method and corresponding OTDR test performance curve after employing this method; Fig. 1 is for adopting the preceding OTDR test curve of this method; Fig. 2 is the OTDR test curve after employing this method, and the contrast test result can find out significantly that in 0 ~ 10km fiber segment the noise level of Fig. 2 obviously reduces; When utilizing software to calculate the OTDR dynamic range automatically, can not cause the judgement of software error because of the excessive noise of fiber segment.
The present invention provides a kind of method of the OTDR of improvement test performance, and three kinds of technology implementation schemes are provided.Main protection is through heating changes wavelength to obtain the technology implementation method of better OTDR test performance to laser.The present invention adopts the method to the laser heating to change laser wavelength; Fluctuation among a small circle takes place in laser wavelength; Just can effectively reduce the noise effect of the interference of light, thereby improve the OTDR test performance the optical fiber of OTDR test, simple and convenient; Improve optical fiber OTDR integrated testability performance, test result is more accurate.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. method of improving optical fiber OTDR test performance; It is characterized in that; A heater block is set on the laser in the OLT optical module, and the OTDR module in the OLT optical module carries out in the optical fiber OTDR test process said heater block being interrupted heating; Heater block is passed to laser with heat, makes laser temperature change.
2. the method for improving optical fiber OTDR test performance according to claim 1 is characterized in that, said heater block is a resistance.
3. the method for improving optical fiber OTDR test performance according to claim 2; It is characterized in that said resistance is arranged on laser inside, in the OTDR test process through this resistance break-make electricity is made its heating; The resistance heat is directly passed to laser, makes laser temperature change.
4. the method for improving optical fiber OTDR test performance according to claim 2; It is characterized in that said resistance is arranged on the laser outside, resistance welded on pcb board; The one side and the laser of pcb board welding resistance fit tightly through thermal paste; Through resistance break-make electricity is made its heating, the resistance heat is passed to laser through thermal paste, makes laser temperature change in the OTDR test process.
5. the method for improving optical fiber OTDR test performance according to claim 2; It is characterized in that said resistance is arranged on the laser outside, resistance welded on adagio; The one side and the laser of the non-welding resistance of adagio fit tightly; Through resistance break-make electricity is made its heating, the resistance heat is passed to laser through adagio, makes laser temperature change in the OTDR test process.
6. according to each described method of improving optical fiber OTDR test performance of claim 3 to 5, it is characterized in that said laser is a Distributed Feedback Laser.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135320A (en) * | 2013-05-02 | 2014-11-05 | 深圳新飞通光电子技术有限公司 | OTDR (Optical Time-Domain Reflectermeter) control circuit of OLT (Optical Line Terminal) optical module |
| CN109525309A (en) * | 2018-11-27 | 2019-03-26 | 武汉光迅科技股份有限公司 | A kind of OTDR combination unit |
| US20240068905A1 (en) * | 2022-08-25 | 2024-02-29 | Ii-Vi Delaware, Inc. | Pluggable Optical Time Domain Reflectometer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1172254A (en) * | 1995-11-01 | 1998-02-04 | 住友电气工业株式会社 | Laser light source apparatus, OTDR apparatus, and optical communication line inspection system |
| CN101015100A (en) * | 2004-05-14 | 2007-08-08 | C8公司 | Temperature tuning of wavelength of semiconductor laser using variable thermal impedance |
| CN101958749A (en) * | 2010-07-24 | 2011-01-26 | 桂林光通电子工程公司 | On-line optical cable monitoring method |
| CN102549946A (en) * | 2011-12-12 | 2012-07-04 | 华为技术有限公司 | Modulator circuit of optical time domain reflectometer test signal, passive optical network and device |
| CN203193637U (en) * | 2013-05-02 | 2013-09-11 | 深圳新飞通光电子技术有限公司 | OTDR control circuit of OLT optical module |
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- 2012-09-13 CN CN2012103379383A patent/CN102820921A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1172254A (en) * | 1995-11-01 | 1998-02-04 | 住友电气工业株式会社 | Laser light source apparatus, OTDR apparatus, and optical communication line inspection system |
| CN101015100A (en) * | 2004-05-14 | 2007-08-08 | C8公司 | Temperature tuning of wavelength of semiconductor laser using variable thermal impedance |
| CN101958749A (en) * | 2010-07-24 | 2011-01-26 | 桂林光通电子工程公司 | On-line optical cable monitoring method |
| CN102549946A (en) * | 2011-12-12 | 2012-07-04 | 华为技术有限公司 | Modulator circuit of optical time domain reflectometer test signal, passive optical network and device |
| CN203193637U (en) * | 2013-05-02 | 2013-09-11 | 深圳新飞通光电子技术有限公司 | OTDR control circuit of OLT optical module |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135320A (en) * | 2013-05-02 | 2014-11-05 | 深圳新飞通光电子技术有限公司 | OTDR (Optical Time-Domain Reflectermeter) control circuit of OLT (Optical Line Terminal) optical module |
| CN104135320B (en) * | 2013-05-02 | 2016-12-28 | 深圳新飞通光电子技术有限公司 | A kind of OTDR control circuit of OLT optical module |
| CN109525309A (en) * | 2018-11-27 | 2019-03-26 | 武汉光迅科技股份有限公司 | A kind of OTDR combination unit |
| US20240068905A1 (en) * | 2022-08-25 | 2024-02-29 | Ii-Vi Delaware, Inc. | Pluggable Optical Time Domain Reflectometer |
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