CN103051378A - Optical fiber fault detecting system based on optical fiber laser chaotic signal - Google Patents
Optical fiber fault detecting system based on optical fiber laser chaotic signal Download PDFInfo
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- CN103051378A CN103051378A CN2012105834602A CN201210583460A CN103051378A CN 103051378 A CN103051378 A CN 103051378A CN 2012105834602 A CN2012105834602 A CN 2012105834602A CN 201210583460 A CN201210583460 A CN 201210583460A CN 103051378 A CN103051378 A CN 103051378A
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Abstract
The invention relates to an optical fiber fault detecting system based on an optical fiber laser chaotic signal. The system comprises a chaotic light generator, a first optical fiber coupler, a circulator, a first photoelectric detector, a second photoelectric detector, a signal acquirer and a signal processing device, and is characterized in that the chaotic light generator is an annular cavity consisting of a semiconductor light amplifier, a polarization controller and a second optical fiber coupler; and light in the annular cavity is output from the second optical fiber coupler and enters the first optical fiber coupler after passing through a light isolator. Remote optical fiber breakpoint positioning with high precision is realized, the problems of limitation of transmission light time domain reflectometer distance to precision and low LD external injection type chaotic light time domain reflectometer precision are overcomed, and the detection precision of a chaotic light time domain reflectometer is improved to the mu m level.
Description
Technical field
The present invention relates to light time territory meter field, be specifically related to a kind of light time territory meter based on the fiber laser chaotic signal.
Background technology
Optical time domain reflectometer OTDR(Optical Time Domain Reflectometer) or back scattering confirmed by Barnoskim and Jensen in 1976 first as the characteristic of optical fiber.Optical time domain reflectometer characterizes the characteristic of optical fiber with Rayleigh scattering and Fresnel reflection.Rayleigh scattering is owing to light signal forms along the scattering that optical fiber produces.OTDR just measures and gets back to a part of scattered light of instrument port.These backscatter signals have just shown the attenuation degree that is caused by optical fiber.By judging that the backscatter signals intensity size that detects on the different time points characterizes fibre loss, the further conversion by time domain and spatial domain, the track of putting on formation in distance-plot of light intensity is a downward curve, it has illustrated that the power of backscattering constantly reduces, and this is owing to all to some extent losses of signal through emission and backscattering after the transmission of a segment distance.
In fact OTDR is to utilize the loss characteristic of its detection to be used for the breakpoint location of detection fiber with rule the most widely, because the loss of fiber failure point increases suddenly, by judging that the distance that loss increases suddenly just can judge breakpoints of optical fiber, owing to this characteristic of OTDR so that its be widely used in the maintenance of telecommunication optical fiber.But tradition utilizes the precision of OTDR of backscattering always lower, in order to improve detection accuracy and dynamic range, has proposed the optical time domain reflectometer of different principle both at home and abroad.Chinese patent ZL200810054534.7, patent name are that the patent of chaos light time domain reflectometer and method of measurement thereof has disclosed a kind of chaos light time domain reflectometer, have utilized outer injection laser chaos signal.But its lowest resolution is 6cm, and is still on the low side.
Summary of the invention
Technical problem to be solved by this invention is contradiction and the low problem of chaos light signal certainty of measurement that overcomes traditional high accuracy optical time domain reflectometer detection accuracy and detection range, a kind of fiber failure detection system based on the fiber laser chaotic signal is proposed, can realize at a distance the high-precision breakpoints of optical fiber location of um magnitude.
For solving the problems of the technologies described above, the present invention proposes a kind of fiber failure detection system based on the fiber laser chaotic signal, comprise chaos light generating apparatus, the first fiber coupler, circulator, the first photodetector, the second photodetector, signal picker and signal processing apparatus, it is characterized in that, described chaos light generating apparatus is the ring cavity that semiconductor optical amplifier, Polarization Controller and the second fiber coupler form, light in the described ring cavity is exported from described the second fiber coupler, enters described the first fiber coupler behind optical isolator.
Preferably, the coupling ratio of described the first fiber coupler is 99:1.
Same preferred, the coupling ratio of described the second fiber coupler is 90:10.
Described signal picker is digital oscilloscope.Described signal processing device is set to computer.
Analytic method of the present invention is to utilize to transmit signals to the used time of inverse signal, calculates the distance of inverse signal reentry point again.Following formula has just illustrated that OTDR is measuring distance how.
L＝(c×t)/2(n
o)
In this formula, c is light speed in a vacuum, and t is to the total time that receives signal (round trip) (it is exactly the distance of one way that two values multiply each other after 2) after the signal emission.Because light is slower than speed in a vacuum in glass, so for measuring distance accurately, tested optical fiber must indicate effective refractive index n
oAs long as determined as seen that by following formula the time of inverse signal just can judge the position of fiber failure point.
The present invention has adopted ring cavity chaos light source and the chaos light signal correlation technique of based semiconductor image intensifer (SOA).Solve the problem of LD exterior injection type chaos light source intensity restriction, improved simultaneously the light source quality of chaos light.Realized the breakpoints of optical fiber location of distant-range high-precision, overcome restriction and the LD exterior injection type chaos light time territory meter precision low problem of transmission light domain reflectometer distance to precision, made the detection accuracy of chaos light time territory meter bring up to the um magnitude.
Description of drawings
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is further described in detail.
Fig. 1 is fiber failure detection system schematic diagram of the present invention.
1-Polarization Controller PC wherein, 2-semiconductor optical amplifier SOA, the 3-the second coupler OC1,4-optical isolator ISO, the 5-the first coupler OC2,6-digital oscilloscope OSC, the 7-the first photoelectric detector PD 1,8-the second photoelectric detector PD 2,9-circulator, 10-testing fiber, 11-computer.
Embodiment
As shown in Figure 1, provide optical amplification function based on SOA in the ring cavity chaos light source of SOA, the transmission light in the ring cavity passes through optical coupler through after amplifying, and a part of light is transmitted away, through polarization controller 1, Polarization Controller 1 can be controlled the polarization state of feedback light to a part as feedback light.Feedback light by Polarization Controller finally forms the chaos light source of circulation amplify feedback further by SOA2 and be exaggerated.The chaos light of SOA ring cavity chaos light source emission is from 3 outputs of described the second fiber coupler, through optical isolator ISO, ISO can isolate the feedback light that is not required and enter in the SOA ring cavity, chaos light is accepted also conduct with reference to light through coupler OC2 rear portion by light the second electric explorer PD2, a part enters in the testing fiber through circulator 9, after by the breakpoint fault plane reflection, receive through circulator and by the first photoelectric detector PD 1 again, the reverberation that is received by PD1 and PD2 and reference light is converted into the signal of telecommunication and by digital oscilloscope OSC record, the position that last computer carries out the reflected signal of record and reference signal relevant treatment and finally draws breakpoint.
Embodiment
Take one section optical fiber as L length as testing fiber, adopt native system that this testing fiber is measured and record, cut out a bit of tail optical fiber at this testing fiber end subsequently, adopt again native system that this testing fiber is measured and record, measuring length difference for twice is 9.207mm, with this as the measurement length of native system to this segment tail optical fiber.Adopt the accurate survey tool of other length to measure the segment tail optical fiber, obtaining physical length is 9.160mm.The two error is 47um.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. fiber failure detection system based on the fiber laser chaotic signal, comprise chaos light generating apparatus, the first fiber coupler, circulator, the first photodetector, the second photodetector, signal picker and signal processing apparatus, it is characterized in that, described chaos light generating apparatus is the ring cavity that semiconductor optical amplifier, Polarization Controller and the second fiber coupler form, light in the described ring cavity is exported from described the second fiber coupler, enters described the first fiber coupler behind optical isolator.
2. the fiber failure detection system based on the fiber laser chaotic signal according to claim 1 is characterized in that, the coupling ratio of described the first fiber coupler is 99:1.
3. the fiber failure detection system based on the fiber laser chaotic signal according to claim 1 and 2 is characterized in that, the coupling ratio of described the second fiber coupler is 90:10.
4. the fiber failure detection system based on the fiber laser chaotic signal according to claim 3 is characterized in that, described signal picker is digital oscilloscope.
5. the fiber failure detection system based on the fiber laser chaotic signal according to claim 4 is characterized in that described signal processing device is set to computer.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516426A (en) * | 2013-10-16 | 2014-01-15 | 华中科技大学 | Wavelength division multiplexing network optical time domain reflectometer |
| CN104048685A (en) * | 2014-07-01 | 2014-09-17 | 华中科技大学 | Quasi-distributed optical fiber sensing system based on spectrum limitation chaos optical signals |
| CN104158587A (en) * | 2014-07-07 | 2014-11-19 | 太原理工大学 | Optical time domain reflect method based on period on-off key chaos signals |
| CN104618013A (en) * | 2015-01-26 | 2015-05-13 | 电子科技大学 | Associated optical time domain reflectometer based on all-fiber wide-spectrum chaotic light source |
| CN105721048A (en) * | 2016-02-19 | 2016-06-29 | 南京晓庄学院 | Compound optical fiber communication line fault monitoring method and system |
| CN105865751A (en) * | 2016-05-26 | 2016-08-17 | 上海交通大学 | System and method for monitoring optical fiber fuse effect |
| CN105953784A (en) * | 2016-04-29 | 2016-09-21 | 重庆华渝电气集团有限公司 | Chaotic signal-based angular rate sensor |
| CN105973280A (en) * | 2016-06-13 | 2016-09-28 | 上海大学 | Discrete multi-switch state detecting system of optical feedback semiconductor laser and detecting method thereof |
| CN108254062A (en) * | 2018-01-05 | 2018-07-06 | 太原理工大学 | A kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation |
| CN108512594A (en) * | 2018-04-23 | 2018-09-07 | 太原理工大学 | A kind of method for subsequent processing improving chaos light time domain reflectometer resolution ratio |
| CN109357842A (en) * | 2014-07-31 | 2019-02-19 | 贰陆股份公司 | Along the optical time domain reflectometer propagated and use the method for the optical time domain reflectometer |
| CN115441947A (en) * | 2022-11-07 | 2022-12-06 | 济南量子技术研究院 | Optical fiber field link dispersion measurement system and method based on time difference measurement |
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| CN101226100A (en) * | 2008-01-31 | 2008-07-23 | 太原理工大学 | Chaos light time domain reflectometer and measuring method thereof |
| CN102594399A (en) * | 2012-02-10 | 2012-07-18 | 中国科学院半导体研究所 | Chaotic ultra wideband (UWB)-over-fiber radio signal generator with adjustable trap property |
| CN102594544A (en) * | 2012-01-04 | 2012-07-18 | 太原理工大学 | Spectral broadening device for chaotic laser signals and method thereof |
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| CN101226100A (en) * | 2008-01-31 | 2008-07-23 | 太原理工大学 | Chaos light time domain reflectometer and measuring method thereof |
| CN102594544A (en) * | 2012-01-04 | 2012-07-18 | 太原理工大学 | Spectral broadening device for chaotic laser signals and method thereof |
| CN102594399A (en) * | 2012-02-10 | 2012-07-18 | 中国科学院半导体研究所 | Chaotic ultra wideband (UWB)-over-fiber radio signal generator with adjustable trap property |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516426A (en) * | 2013-10-16 | 2014-01-15 | 华中科技大学 | Wavelength division multiplexing network optical time domain reflectometer |
| CN104048685A (en) * | 2014-07-01 | 2014-09-17 | 华中科技大学 | Quasi-distributed optical fiber sensing system based on spectrum limitation chaos optical signals |
| CN104048685B (en) * | 2014-07-01 | 2017-01-11 | 华中科技大学 | Quasi-distributed optical fiber sensing system based on spectrum limitation chaos optical signals |
| CN104158587B (en) * | 2014-07-07 | 2017-02-15 | 太原理工大学 | Optical time domain reflect method based on period on-off key chaos signals |
| CN104158587A (en) * | 2014-07-07 | 2014-11-19 | 太原理工大学 | Optical time domain reflect method based on period on-off key chaos signals |
| CN109357842B (en) * | 2014-07-31 | 2020-11-20 | 贰陆股份公司 | Propagating optical time domain reflectometer and method of using the same |
| CN109357842A (en) * | 2014-07-31 | 2019-02-19 | 贰陆股份公司 | Along the optical time domain reflectometer propagated and use the method for the optical time domain reflectometer |
| CN104618013A (en) * | 2015-01-26 | 2015-05-13 | 电子科技大学 | Associated optical time domain reflectometer based on all-fiber wide-spectrum chaotic light source |
| CN104618013B (en) * | 2015-01-26 | 2017-08-11 | 电子科技大学 | A kind of related optical time domain reflectometer based on all -fiber wide range chaos light source |
| CN105721048A (en) * | 2016-02-19 | 2016-06-29 | 南京晓庄学院 | Compound optical fiber communication line fault monitoring method and system |
| CN105721048B (en) * | 2016-02-19 | 2017-03-22 | 南京晓庄学院 | Compound optical fiber communication line fault monitoring method and system |
| CN105953784A (en) * | 2016-04-29 | 2016-09-21 | 重庆华渝电气集团有限公司 | Chaotic signal-based angular rate sensor |
| CN105865751A (en) * | 2016-05-26 | 2016-08-17 | 上海交通大学 | System and method for monitoring optical fiber fuse effect |
| CN105973280A (en) * | 2016-06-13 | 2016-09-28 | 上海大学 | Discrete multi-switch state detecting system of optical feedback semiconductor laser and detecting method thereof |
| CN105973280B (en) * | 2016-06-13 | 2018-04-06 | 上海大学 | The discrete Multi- Switch condition detecting system and method for light feedback semiconductor laser |
| CN108254062A (en) * | 2018-01-05 | 2018-07-06 | 太原理工大学 | A kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation |
| CN108512594A (en) * | 2018-04-23 | 2018-09-07 | 太原理工大学 | A kind of method for subsequent processing improving chaos light time domain reflectometer resolution ratio |
| CN108512594B (en) * | 2018-04-23 | 2020-11-27 | 太原理工大学 | Subsequent processing method for improving resolution of chaotic optical time domain reflectometer |
| CN115441947A (en) * | 2022-11-07 | 2022-12-06 | 济南量子技术研究院 | Optical fiber field link dispersion measurement system and method based on time difference measurement |
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Application publication date: 20130417 |