CN104618013A - Associated optical time domain reflectometer based on all-fiber wide-spectrum chaotic light source - Google Patents
Associated optical time domain reflectometer based on all-fiber wide-spectrum chaotic light source Download PDFInfo
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Abstract
The invention discloses an associated optical time domain reflectometer based on all-fiber wide-spectrum chaotic light source, relating to the field of a chaotic fiber laser and an optical time domain reflectometer. The reflectometer comprises an all-fiber chaotic light source and an associated optical time domain reflection system; the associated optical time domain reflection system comprises an adjustable attenuator, an optical filter, a coupler, a circulator, photoelectric detectors and an oscilloscope; the emergent light of the all-fiber chaotic light source shoots into the associated optical time domain reflection system and then sequentially passes through the adjustable attenuator, the optical filter and the coupler; chaotic light signals passing through the coupler are divided into reference signals and detection signals; the reference signals are directly converted into electrical signals by the photoelectric detector, and acquired and stored by the oscilloscope; the detection signals pass through the circulator to realize the function of the reflectometer; and reflected signals are converted into electrical signals by the other photoelectric detector and then are acquired and stored by the same oscilloscope. The associated optical time domain reflectometer based on the all-fiber wide-spectrum chaotic light source is simple in systemic structure, high in stability and capable of realizing high resolution and long distance of sensing at the same time.
Description
Technical field
The present invention relates to chaos fiber laser and optical time domain reflectometer field, especially a kind of relationship type optical time domain reflectometer based on all-fiber broadband chaotic laser light device.
Background technology
Along with the development of information-intensive society, optical fiber communication and sensing network more and more huger, in the life of people, also play more and more important role.For optical-fiber network and device, light reflectometry techniques is a kind of important failure diagnosis means, and under this background, the development of light reflectometry techniques obtains increasing concern.
Light reflectometry techniques mainly comprises three kinds: the reflection of optical time domain reflection, Low coherence frequency domain, relevant probe beam deflation.These three kinds of light reflectometry techniques have restriction in each indexs such as measuring distance, spatial resolution, detectivity and precision.Such as Low coherence frequency domain reflection technology has high detectivity, the spatial resolution of submillimeter level, but its detection range is no more than several meters usually; And optical time domain reflection technology is generally used for long the distance even application scenario of extra long distance (dozens of kilometres), but resolution is lower, usually can only arrive rice magnitude; Probe beam deflation instrument technology is by can realizing millimetre-sized sensing accuracy based on the homodyne coherent detection technology of swept light source and can reaching the distance sensing of several kilometers.
Can say that the comprehensive survey sensing capability of probe beam deflation instrument technology occupy between another two kinds of technology, be that their one is effectively supplementary.But optical frequency domain reflection technology needs meticulous swept light source and homodyne coherent detection, its technical difficulty compares optical time domain reflection technology and Yan Geng great, and Low coherence frequency domain reflection technology can not accomplish long-distance sensing substantially.Utilize the chaos light source of LD pumping to achieve 6cm sensing accuracy at first technology CN101226100A, but limit by its signal power and detector gain, its distance sensing is tens of rice only.
All-fiber broadband of the present invention chaos light source with utilize the chaotic laser light device of diode-end-pumped and compare, have larger bandwidth, arrange more easily, the sensing length of dozens of kilometres can be realized, the resolution of centimetres.
And the broadband continuous chaos light signal utilizing all-fiber devices to produce based on the relative photo time-domain reflectomer of all-fiber wide range chaos light source of the present invention signal for referencial use and detectable signal respectively, then reflected signal and reference signal are done the breakpoint that computing cross-correlation gets final product Detection location fiber optic network.Its positioning precision can reach centimetre even millimeter magnitude, and sensing length reaches dozens of kilometres.
Summary of the invention
The object of the invention is the light reflectometry techniques Problems existing for background technology, provide that a kind of system configuration is simple, stability is high, can realize the relationship type optical time domain reflectometer of sensing high-resolution, distance simultaneously.
Technical scheme of the present invention is a kind of relative photo time-domain reflectomer based on all-fiber wide range chaos light source, and this reflectometer comprises: all-fiber chaos light source and relationship type optical time domain reflection system; Described relationship type optical time domain reflection system comprises: adjustable attenuator, optical filter, coupler, circulator, photodetector, oscilloscope; The emergent light of described all-fiber chaos light source injects relationship type optical time domain reflection system, first successively by adjustable attenuator, optical filter, coupler, be divided into reference signal and detectable signal by the chaos light signal of coupler, reference signal is directly converted to the signal of telecommunication by photodetector and is gathered by oscilloscope and to store; Detectable signal realizes reflectometer function through circulator, is gathered and store after reflected signal is converted to the signal of telecommunication by another photodetector by same oscilloscope.
Described all-fiber chaos light source comprises: raman pump light source, optical isolator, zero dispersion shift fiber, and the pump light that raman pump light source sends is successively by optical isolator, zero dispersion shift fiber.
The length of described zero dispersion shift fiber length is 10 ~ 20km.
In described all-fiber chaos light source, raman pump light source is 1455nm raman pump light source.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1. the present invention adopts the broadband chaos light source of all-fiber, the chaos light source utilizing Raman fiber lasers pumping zero dispersion shift fiber to realize ultra broadband exports, compare the chaos light source that traditional diode-end-pumped produces, its structure is simpler, output bandwidth is larger, can realize more high-precision spatial resolution;
2. because input signal is continuous signal and non-pulse signal, so the spatial resolution of the described relative photo time-domain reflectomer based on all-fiber wide range chaos light source be can't help signal pulsewidth and determined, therefore the described relative photo time-domain reflectomer based on all-fiber wide range chaos light source can realize the orientation sensing of long distance when ensureing higher spatial resolution;
3. the present invention compared with prior art, need not high performance light-pulse generator, and electrical domain random signal generator that also need not be expensive, cost is lower, and practicality is better.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the structural representation of the relative photo time-domain reflectomer based on all-fiber wide range chaos light source of the present invention;
Fig. 2 is the spectrogram of the fine chaos light source of broad band full in the embodiment of the present invention;
Fig. 3 is the time-domain diagram of the fine chaos light source of broad band full in the embodiment of the present invention;
Fig. 4 is the reflection point positioning result of 25km measuring fiber in the embodiment of the present invention, and spatial resolution reaches 5.2cm, signal to noise ratio 18dB.
In Fig. 1: 1.1455nm raman pump light source; 2. optical isolator; 3. zero dispersion shift fiber; 4. adjustable optical attenuator; 5. optical filter; 6. coupler; 7. photodetector; 8. circulator; 9. photodetector (with 7); 10. measuring fiber (G.652); 11. real time oscilloscopes.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated.
Be illustrated in figure 1 the relative photo time-domain reflectomer structural representation based on all-fiber wide range chaos light source of the present invention, this system comprises the ultra wide band chaotic light source of 1455nm raman pump light source 1, optical isolator 2, zero dispersion shift fiber 3,1,2,3 composition all-fiber; This system also comprises adjustable optical attenuator 4, optical filter 5, coupler 6, photodetector 7 and 9, circulator 8; Measuring fiber (G.652) 10 and real time oscilloscope 11.Described zero dispersion shift fiber 3 length is 16km, and its length determines pump power needed for ultra wide band chaotic light source, and in of the present invention, its length of zero dispersion shift fiber length 3 should between 10-20km.The centre wavelength of described optical filter 5 is 1550.2nm, and three dB bandwidth is 0.26nm.
Described circulator 8 has port one, port two and port three, and described port one is connected with coupler, and described port two is connected with measuring fiber, and described port three is connected with photodetector.
Fig. 2 is the spectrogram of all-fiber chaos light source of the present invention, and Fig. 3 is the time-domain diagram of the fine chaos light source of broad band full in the embodiment of the present invention; Fig. 4 is the sample result that spy detection technique of the present invention is applied to 25km breakpoints of optical fiber detection and localization.Test non-zero dispersion displacement optical fiber total length 15km used, zero dispersion displacement wavelength is 1440nm, chromatic dispersion gradient 0.045ps/nm
2/ km, 1455 pumpings are operated in normal dispersion region.Along with pump power increases gradually, the bandwidth of the chaos light source of generation also increases gradually, and when pump power reaches 1.48W, the bandwidth of chaos light source reaches maximum 141nm (10dB bandwidth).Continue to increase pump power, due to stimulated Raman scattering, power gradually to second order and three rank stokes light transfers, and gathers near 1550nm to 1650nm.
Fig. 3 is the fixed test result figure that the relative photo time-domain reflectomer technology based on all-fiber wide range chaos light source of the present invention is applied to 25km measuring fiber.Raman pump light source is that 1.48W has maximum bandwidth to export to make chaos light source.Coupler splitting ratio is 1:99, and 1% end exports as reference light, and 99% end exports as detection light.By regulating adjustable attenuator, the two paths of signals after coupler beam splitting is made to have more suitable luminous power, in this experiment, the power output of 1% end is-17dBm, 99% end power output is 0.8dBm, optical fiber tail-end simulates breakpoint with Fresnel reflection, and consider that reflectivity is 4%, described circulator three port Output optical power is-25dBm.Two photodetectors used are the 1GHz detector of same band in addition, and oscilloscope used is 25GHz bandwidth, and sample rate is set to 25Gs/s.Eventually pass through the cross-correlation function calculating two paths of signals, obtain the cross-correlation curve shown in Fig. 3.The peak value of cross-correlation curve goes out i.e. fiber reflection point position, and technology of the present invention accurately measures fiber lengths 24768.94 meters, by judging that the full width at half maximum determination spatial resolution of peak curve is 5.2cm.
Claims (4)
1. based on a relative photo time-domain reflectomer for all-fiber wide range chaos light source, this reflectometer comprises: all-fiber chaos light source and relationship type optical time domain reflection system; Described relationship type optical time domain reflection system comprises: adjustable attenuator, optical filter, coupler, circulator, photodetector, oscilloscope; The emergent light of described all-fiber chaos light source injects relationship type optical time domain reflection system, first successively by adjustable attenuator, optical filter, coupler, be divided into reference signal and detectable signal by the chaos light signal of coupler, reference signal is directly converted to the signal of telecommunication by photodetector and is gathered by oscilloscope and to store; Detectable signal realizes reflectometer function through circulator, is gathered and store after reflected signal is converted to the signal of telecommunication by another photodetector by same oscilloscope.
2. a kind of relative photo time-domain reflectomer based on all-fiber wide range chaos light source as claimed in claim 1, it is characterized in that described all-fiber chaos light source comprises: raman pump light source, optical isolator, zero dispersion shift fiber, the pump light that raman pump light source sends is successively by optical isolator, zero dispersion shift fiber.
3. a kind of relative photo time-domain reflectomer based on all-fiber wide range chaos light source as claimed in claim 1, is characterized in that the length of described zero dispersion shift fiber length is 10 ~ 20km.
4. a kind of relative photo time-domain reflectomer based on all-fiber wide range chaos light source as claimed in claim 1, is characterized in that in described all-fiber chaos light source, raman pump light source is 1455nm raman pump light source.
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| 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 |
| CN107490434A (en) * | 2017-07-24 | 2017-12-19 | 南开大学 | The method and device that a kind of multimode light pulse cluster space-time spectral information measures at a high speed |
| 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 |
| CN108540216A (en) * | 2018-04-23 | 2018-09-14 | 太原理工大学 | A kind of high-precision chaotic optical time domain reflectometer |
| CN111896138A (en) * | 2020-07-15 | 2020-11-06 | 太原理工大学 | Long-distance high-spatial-resolution distributed chaotic Raman optical fiber sensing device |
| CN112378430A (en) * | 2020-10-29 | 2021-02-19 | 太原理工大学 | Distributed optical fiber Raman sensing device and method based on chaotic laser |
| CN112461276A (en) * | 2020-11-10 | 2021-03-09 | 电子科技大学 | System and method for reducing OFDR light source nonlinear phase influence |
| CN114142921A (en) * | 2021-12-09 | 2022-03-04 | 中山水木光华电子信息科技有限公司 | All-optical storage system and method based on different central wavelength optical fiber codes |
| CN114878141A (en) * | 2022-04-22 | 2022-08-09 | 成都飞机工业（集团）有限责任公司 | Airborne optical cable connection fault positioning method and system |
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| 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 |
| CN107490434B (en) * | 2017-07-24 | 2020-01-17 | 南开大学 | Method and device for high-speed measurement of multimode optical pulse cluster space-time spectrum information |
| CN107490434A (en) * | 2017-07-24 | 2017-12-19 | 南开大学 | The method and device that a kind of multimode light pulse cluster space-time spectral information measures at a high speed |
| 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 |
| CN108540216A (en) * | 2018-04-23 | 2018-09-14 | 太原理工大学 | A kind of high-precision chaotic optical time domain reflectometer |
| 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 |
| CN108540216B (en) * | 2018-04-23 | 2021-01-08 | 太原理工大学 | High-precision chaotic optical time domain reflectometer |
| CN111896138A (en) * | 2020-07-15 | 2020-11-06 | 太原理工大学 | Long-distance high-spatial-resolution distributed chaotic Raman optical fiber sensing device |
| CN112378430A (en) * | 2020-10-29 | 2021-02-19 | 太原理工大学 | Distributed optical fiber Raman sensing device and method based on chaotic laser |
| CN112461276A (en) * | 2020-11-10 | 2021-03-09 | 电子科技大学 | System and method for reducing OFDR light source nonlinear phase influence |
| CN114142921A (en) * | 2021-12-09 | 2022-03-04 | 中山水木光华电子信息科技有限公司 | All-optical storage system and method based on different central wavelength optical fiber codes |
| CN114142921B (en) * | 2021-12-09 | 2023-02-28 | 中山水木光华电子信息科技有限公司 | All-optical storage system and method based on different central wavelength optical fiber codes |
| CN114878141A (en) * | 2022-04-22 | 2022-08-09 | 成都飞机工业（集团）有限责任公司 | Airborne optical cable connection fault positioning method and system |
| CN114878141B (en) * | 2022-04-22 | 2023-08-04 | 成都飞机工业（集团）有限责任公司 | Airborne optical cable connection fault positioning method and system |
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