CN204190770U - A kind of fiber failure positioner based on FMCW technology - Google Patents
A kind of fiber failure positioner based on FMCW technology Download PDFInfo
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- CN204190770U CN204190770U CN201420673746.4U CN201420673746U CN204190770U CN 204190770 U CN204190770 U CN 204190770U CN 201420673746 U CN201420673746 U CN 201420673746U CN 204190770 U CN204190770 U CN 204190770U
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- fmcw
- frequency mixer
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- photodetector
- fiber failure
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- 239000000835 fiber Substances 0.000 title claims abstract description 31
- 238000001228 spectrum Methods 0.000 claims abstract description 14
- 230000035945 sensitivity Effects 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 229910003327 LiNbO3 Inorganic materials 0.000 claims 1
- 230000001427 coherent effect Effects 0.000 abstract description 9
- 239000013307 optical fiber Substances 0.000 abstract description 7
- 238000003745 diagnosis Methods 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 2
- 238000002168 optical frequency-domain reflectometry Methods 0.000 description 2
- 238000000253 optical time-domain reflectometry Methods 0.000 description 2
- 230000035559 beat frequency Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Testing Of Optical Devices Or Fibers (AREA)
Abstract
The utility model discloses a kind of fiber failure positioner based on FMCW technology, it comprises FMCW signal source, FMCW signal source is connected with external modulator and frequency mixer, the two ends of external modulator connect a mouth of light source and three terminal device circulators respectively, the c mouth of circulator is connected with photodetector, be connected with frequency mixer after photodetector, frequency mixer, low pass filter, spectrum analyzer are connected successively with computer.Fiber failure positioning device structure of the present utility model is simple, after can utilizing photodetector that light signal is changed into the signal of telecommunication, carries out electric Coherent processing, from difference frequency signal, obtain fiber distance in frequency mixer.By the light Coherent processing of complexity instead of simple electric Coherent processing, optical fiber distance measuring is more easily realized, and the linear frequency sweep light source that instead of with common laser light source in existing apparatus, reduces cost, for fiber failure location and diagnosis provide a kind of new device.
Description
Technical field
The utility model belongs to optical fiber distance measuring field, is specifically related to a kind of fiber failure positioner based on FMCW technology.
Background technology
The method of traditional fiber failure location mainly utilizes optical time domain reflectometer OTDR to measure fault point distance, its general principle is in testing fiber, launch a short light pulse, fiber distance is calculated by the time response detecting light dorsad, OTDR is higher to light source requirements, and spatial resolution and dynamic range, there is contradiction between system sensitivity.Continuous Wave with frequency modulation FMCW is a kind of technology used in High Accuracy Radar range finding, and major advantage is that range accuracy is high, equipment is relatively simple, is easy to realize solid state design etc.Current OFDR technology utilizes FMCW technology to realize light Coherent processing in area of light, spatial resolution and system sensitivity high, but realize that difficulty is large, measuring distance is short, environment is very responsive to external world, is mainly used in distributed temperature sensing, be difficult to be used in the optical fiber distance measuring of long distance.
Utility model content
The purpose of this utility model is to provide a kind of fiber failure positioner based on FMCW technology, solve existing based in the fiber failure positioner of OFDR technology, the technical sophistication using linear frequency sweep light source and coupler to carry out light Coherent processing to cause, poor stability, cost are high and can not be used for the problem of long-distance optical fiber range finding.
The technical scheme that the utility model adopts is, a kind of fiber failure positioner based on FMCW technology, comprise FMCW signal source, FMCW signal source is connected with external modulator and frequency mixer, the two ends of external modulator connect a mouth of light source and three terminal device circulators respectively, the c mouth of circulator is connected with photodetector, is connected with frequency mixer after photodetector.
Feature of the present utility model is also,
Fiber failure positioner also comprises low pass filter, spectrum analyzer and computer, and wherein, frequency mixer, low-pass filtering, spectrum analyzer are connected successively with computer.
Light source is semiconductor laser, and the acp chip of FMCW signal source adopts AD9858, and external modulator is M-Z modulator, adopts JDSU LiNbO
3electro-optic intensity modulator, photodetector adopts KG-HSP high sensitivity optical detection module, and the acp chip of frequency mixer is AD834.
Spectrum analyzer adopts RIGOL DSA1030A instrument.
The beneficial effects of the utility model are, fiber failure positioning device structure of the present utility model is simple, by photodetector, light signal is changed into the signal of telecommunication, then in frequency mixer, carries out electric Coherent processing, from difference frequency signal, obtain fiber distance.Because electric Coherent processing process is simple, optical fiber distance measuring is more easily realized.The light Coherent processing of complexity is replaced with simple electric Coherent processing by fiber failure positioner of the present utility model, and the linear frequency sweep light source that instead of with common laser light source in existing apparatus, reduce cost, for fiber failure location and diagnosis provide a kind of new device.
Accompanying drawing explanation
Fig. 1 is the fiber failure positioning device structure figure based on FMCW technology of the present utility model.
In figure, 1. light source, 2.FMCW signal source, 3. external modulator, 4. circulator, 5. photo-detector, 6. frequency mixer, 7. low pass filter, 8. spectrum analyzer, 9. computer, 10. circulator a mouth, 11. circulator c mouths, 12. circulator b mouths.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail.
See Fig. 1, fiber failure positioner based on FMCW technology comprises FMCW signal source 2, FMCW signal source 2 is connected with external modulator 3 and frequency mixer 6, the two ends of external modulator 3 connect a mouth 10 of light source 1 and three terminal device circulators 4 respectively, the c mouth 11 of circulator 4 is connected with photodetector 5, be connected with frequency mixer 6 after photodetector 5, frequency mixer 6, low pass filter 7, spectrum analyzer 8 are connected successively with computer 9.
Wherein, circulator b mouth 12 connects testing fiber, and light source 1 is semiconductor laser, and the acp chip of FMCW signal source 2 adopts AD9858, and external modulator 3 is M-Z modulator, adopts JDSU LiNbO
3electro-optic intensity modulator, photodetector 5 has high sensitivity and low noise equivalent power, and adopt KG-HSP high sensitivity optical detection module, the acp chip of frequency mixer 6 is AD834, and spectrum analyzer 8 adopts RIGOL DSA1030A instrument.
The course of work of the fiber failure positioner based on FMCW technology of the present utility model is, FMCW signal source 2 produces two-way linear frequency modulation continuous wave signal simultaneously, one tunnel is as reference signal input mixer 6, another road is as modulation signal input external modulator 3, the direct current light signal driving external modulator 3 pairs of light sources 1 to produce carries out external modulation, first light signal after modulation enters circulator by a mouth of circulator 4, testing fiber is injected again through b mouth, incident light in optical fiber is separated with back-scattering light by circulator 4, then by c mouth by backscattering light output, back-scattering light is converted to the signal of telecommunication through photodetector 5, this signal of telecommunication is reflected signal, reflected signal enters frequency mixer 6 after photodetector 5 exports, frequency mixer 6 carries out mixing by from the reference signal of FMCW signal source 2 and the reflected signal of photodetector 4, by low pass filter 7 filtering high fdrequency component after mixing, obtain the difference frequency signal comprising range information, difference frequency signal exports rear input spectrum analyzer 8 from low pass filter 7, spectrum analyzer 8 carries out frequency domain sample and fast fourier transform (FFT) analyzes data, data after computer 9 collection analysis displays image information, frequency information is converted to fiber position information.
The general principle that the utility model utilizes FMCW technology to carry out fiber failure location is, FMCW signal source produces two-way linear frequency modulation continuous wave signal simultaneously, one tunnel is as reference signal input mixer, another road is as modulation signal input M-Z modulator, external modulation is carried out to light source, light signal after modulation injects testing fiber by circulator, because light exists Rayleigh scattering and Fresnel reflection in the transmitting procedure of optical fiber, photodetector converts back-scattering light to the signal of telecommunication, is referred to as reflected signal.With broadband analogue multiplier, mixing is carried out to reference signal and reflected signal, because reflected signal and reference signal have one section of time delay, thus cause between reflected signal and reference signal, there is certain difference on the frequency, then use low pass filter filtering high fdrequency component, obtain the difference frequency signal comprising range information.Use spectrum analyzer to carry out frequency domain sample and FFT, obtain spectrum information, finally by computer acquisition spectrum analyzer data, from the beat frequency information obtained, obtain range information, thus calculate the position of fiber failure point.
Claims (4)
1. the fiber failure positioner based on FMCW technology, it is characterized in that, comprise FMCW signal source (2), FMCW signal source (2) is connected with external modulator (3), frequency mixer (6) respectively, the two ends of external modulator (3) connect a mouth (10) of light source (1) and three terminal device circulators (4) respectively, the c mouth (11) of circulator (4) is connected with photodetector (5), is connected with frequency mixer (6) after photodetector (5).
2. a kind of fiber failure positioner based on FMCW technology as claimed in claim 1, it is characterized in that, frequency mixer (6) is also connected with low pass filter (7), spectrum analyzer (8) and computer (9) successively.
3. a kind of fiber failure positioner based on FMCW technology as claimed in claim 1, it is characterized in that, described light source (1) is semiconductor laser, the acp chip of described FMCW signal source (2) adopts AD9858, described external modulator (3) is M-Z modulator, adopt JDSU LiNbO3 electro-optic intensity modulator, described photodetector (5) adopts KG-HSP high sensitivity optical detection module, and the acp chip of described frequency mixer (6) is AD834.
4. a kind of fiber failure positioner based on FMCW technology as claimed in claim 2, is characterized in that, described spectrum analyzer (8) adopts RIGOL DSA1030A instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420673746.4U CN204190770U (en) | 2014-11-12 | 2014-11-12 | A kind of fiber failure positioner based on FMCW technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420673746.4U CN204190770U (en) | 2014-11-12 | 2014-11-12 | A kind of fiber failure positioner based on FMCW technology |
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| CN204190770U true CN204190770U (en) | 2015-03-04 |
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| CN201420673746.4U Expired - Fee Related CN204190770U (en) | 2014-11-12 | 2014-11-12 | A kind of fiber failure positioner based on FMCW technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823431A (en) * | 2016-03-25 | 2016-08-03 | 江苏骏龙电力科技股份有限公司 | Optical fiber over-bending detection method |
| CN106645949A (en) * | 2016-09-26 | 2017-05-10 | 武汉大学 | Heterodyne sweep-frequency type spectrum analyzer based on low frequency detection |
| CN110261799A (en) * | 2019-06-19 | 2019-09-20 | 中国科学院合肥物质科学研究院 | Detection system is quenched using the high-temperature superconducting magnet of Distributed Optical Fiber Sensing Techniques |
-
2014
- 2014-11-12 CN CN201420673746.4U patent/CN204190770U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823431A (en) * | 2016-03-25 | 2016-08-03 | 江苏骏龙电力科技股份有限公司 | Optical fiber over-bending detection method |
| CN106645949A (en) * | 2016-09-26 | 2017-05-10 | 武汉大学 | Heterodyne sweep-frequency type spectrum analyzer based on low frequency detection |
| CN106645949B (en) * | 2016-09-26 | 2019-05-24 | 武汉大学 | A kind of heterodyne sweep frequency type spectrum analyzer based on low frequency detection |
| CN110261799A (en) * | 2019-06-19 | 2019-09-20 | 中国科学院合肥物质科学研究院 | Detection system is quenched using the high-temperature superconducting magnet of Distributed Optical Fiber Sensing Techniques |
| CN110261799B (en) * | 2019-06-19 | 2022-02-15 | 中国科学院合肥物质科学研究院 | High-temperature superconducting magnet quench detection system using distributed optical fiber sensing technology |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20161112 |