CN104618013B - A kind of related optical time domain reflectometer based on all -fiber wide range chaos light source - Google Patents
A kind of related optical time domain reflectometer based on all -fiber wide range chaos light source Download PDFInfo
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- CN104618013B CN104618013B CN201510038448.7A CN201510038448A CN104618013B CN 104618013 B CN104618013 B CN 104618013B CN 201510038448 A CN201510038448 A CN 201510038448A CN 104618013 B CN104618013 B CN 104618013B
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Abstract
A kind of related optical time domain reflectometer based on all -fiber wide range chaos light source of the disclosure of the invention, is related to chaos optical fiber laser and optical time domain reflectometer neck.The reflectometer includes：All -fiber chaos light source and relationship type optical time domain reflection system；Relationship type optical time domain reflection system includes：Adjustable attenuator, optical filter, coupler, circulator, photodetector, oscillograph；The emergent light of all -fiber chaos light source injects relationship type optical time domain reflection system, adjustable attenuator, optical filter, coupler are passed sequentially through first, reference signal and detectable signal are divided into by the chaos optical signal of coupler, reference signal is directly converted to electric signal by photodetector and is gathered and stored by oscillograph；Detectable signal realizes reflectometer function by circulator, and reflected signal is converted to after electric signal by another photodetector and is gathered and stored by same oscillograph.With system architecture is simple, stability is high, can realize sensing high-resolution, the effect of distance simultaneously.
Description
Technical field
It is especially a kind of to be mixed based on all -fiber broadband the present invention relates to chaos optical fiber laser and optical time domain reflectometer field
The relationship type optical time domain reflectometer of ignorant laser.
Background technology
With the development of information-intensive society, fiber optic communication and sensing network are more and more huger, also play the part of in the life of people
More and more important role.For optical-fiber network and device, light reflectometry techniques are a kind of important fault diagnosis means,
Under this background, the development of light reflectometry techniques has obtained increasing concern.
Light reflectometry techniques mainly include three kinds：Optical time domain reflection, the reflection of Low coherence frequency domain, relevant probe beam deflation.This
Three kinds of light reflectometry techniques have restriction in each index such as measurement distance, spatial resolution, detectivity and precision.Than
As said, Low coherence frequency domain reflection technology has a high detectivity, the spatial resolution of submillimeter level, but its detection range
Typically not greater than several meters；And optical time domain reflection technology is generally used for over long distances the even applied field of extra long distance (dozens of kilometres)
Close, but resolution ratio is relatively low, is typically only capable to rice magnitude；Probe beam deflation instrument technology is relevant by the homodyne based on swept light source
Detection technique can realize millimetre-sized sensing accuracy and can reach several kilometers of distance sensing.
It may be said that the comprehensive survey sensing capability of probe beam deflation instrument technology is occupy between other two technology, it is their one
Plant effectively supplement.But, optical frequency domain reflection technology needs fine swept light source and homodyne coherent detection, and its technical difficulty is compared
Bigger for optical time domain reflection technology, Low coherence frequency domain reflection technology can not possibly substantially accomplish long-distance sensing.First technology
CN101226100A realizes 6cm sensing accuracies using the chaos light source of LD pumpings, but by its signal power and detector gain
Limitation, the only tens of rice of its distance sensing.
All -fiber broadband chaos light source of the present invention is compared with using the chaos laser of diode-end-pumped,
Possess bigger bandwidth, it is more easy to set, it is possible to achieve the sensing length of dozens of kilometres, the resolution ratio of centimetres.
And the related optical time domain reflectometer of the present invention based on all -fiber wide range chaos light source utilizes all-fiber devices
The continuous chaos optical signal in broadband of generation makees reference signal and detectable signal respectively, then reflected signal and reference signal are done mutually
Close computing can Detection location fiber optic network breakpoint.Its positioning precision can reach centimetre even millimeter magnitude, sensing length
Reach dozens of kilometres.
The content of the invention
The purpose of the present invention is that there is provided a kind of letter of system architecture the problem of presence for the light reflectometry techniques of background technology
Single, stability is high, can realize sensing high-resolution, the relationship type optical time domain reflectometer of distance simultaneously.
The technical scheme is that a kind of related optical time domain reflectometer based on all -fiber wide range chaos light source, the reflection
Instrument includes：All -fiber chaos light source and relationship type optical time domain reflection system；The relationship type optical time domain reflection system includes：It is adjustable
Attenuator, optical filter, coupler, circulator, photodetector, oscillograph；The emergent light of all -fiber chaos light source is penetrated
Enter relationship type optical time domain reflection system, adjustable attenuator, optical filter, coupler are passed sequentially through first, pass through the mixed of coupler
Ignorant optical signal is divided into reference signal and detectable signal, and reference signal is directly converted to electric signal by oscillograph by photodetector
Gather and store；Detectable signal realizes reflectometer function by circulator, and reflected signal is converted to electricity by another photodetector
Gathered and stored by same oscillograph after signal.
The all -fiber chaos light source includes：Raman pump light source, optoisolator, zero dispersion shift fiber, Raman pump
The pump light that light source is sent passes sequentially through optoisolator, zero dispersion shift fiber.
The length of the zero dispersion shift fiber length is 10~20km.
Raman pump light source is 1455nm raman pump light sources in all -fiber chaos light source.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. the present invention utilizes Raman fiber lasers pumping zero dispersion displacement light using the broadband chaos light source of all-fiber
Fibre realizes the chaos light source output of ultra wide band, the chaos light source produced compared to traditional diode-end-pumped, and its structure is more
Simply, output bandwidth is bigger, can realize the spatial resolution of higher precision；
It is described based on all -fiber wide range chaos light source 2. because input signal is continuous signal and non-pulse signal
The spatial resolution of related optical time domain reflectometer do not determine by signal pulsewidth, therefore described based on all -fiber wide range chaos light source
Related optical time domain reflectometer can realize the orientation sensing of long range in the case where ensureing higher spatial resolution；
3. the present invention is compared with prior art, without high performance light-pulse generator, without expensive electrical domain random signal
Generator, cost is lower, and practicality is more preferable.
Brief description of the drawings
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 related optical time domain reflectometer of the present invention based on all -fiber wide range chaos light source；
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 test optical 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. optoisolator；3. zero dispersion shift fiber；4. variable optical attenuation
Device；5. optical filter；6. coupler；7. photodetector；8. circulator；9. photodetector (with 7)；10. test optical fiber
(G.652)；11. real-time oscilloscope.
Embodiment
The present invention is elaborated below in conjunction with the accompanying drawings.
It is the related optical time domain reflectometer structural representation of the present invention based on all -fiber wide range chaos light source as shown in Figure 1
Figure, the system includes 1455nm raman pump light sources 1, optoisolator 2, the composition all-fiber of zero dispersion shift fiber 3,1,2,3
Ultra wide band chaotic light source；The system also include adjustable optical attenuator 4, optical filter 5, coupler 6, photodetector 7 and 9,
Circulator 8；Test optical fiber (G.652) 10 and real-time oscilloscope 11.The length of zero dispersion shift fiber 3 is 16km, its length
Pump power needed for ultra wide band chaotic light source is determined, in of the present invention, its length of zero dispersion shift fiber 3 should be in 10-
Between 20km.The centre wavelength of the optical filter 5 is 1550.2nm, and three dB bandwidth is 0.26nm.
The circulator 8 has port one, port two and port three, and the port one is connected with coupler, the port
Two are connected with test optical fiber, and the 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 broad band full in the embodiment of the present invention
The time-domain diagram of fine chaos light source；Fig. 4 is the reality that spy detection technique of the present invention is applied to 25km breakpoints of optical fiber detection and localizations
Example result.Experiment non-zero dispersion displacement optical fiber total length 15km, a length of 1440nm of zero dispersion displacement wave, chromatic dispersion gradient used
0.045ps/nm2/ km, 1455nm pumping are operated in normal dispersion region.As pump power gradually increases, the chaos light source of generation
Bandwidth also gradually increase, 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 is gradually shifted to second order and three rank stokes lights, and
Gather near 1550nm to 1650nm.
Fig. 3 is that the related optical time domain reflectometer technology of the present invention based on all -fiber wide range chaos light source is applied to
25km tests the fixed test result figure of optical fiber.Raman pump light source is 1.48W so that chaos light source has maximum bandwidth output.Coupling
Clutch splitting ratio is 1:99, the output of 1% end is used as detection light as reference light, the output of 99% end.By adjusting adjustable attenuator,
The two paths of signals after coupler beam splitting is had appropriate luminous power, in this experiment, the power output at 1% end for-
17dBm, 99% end power output is 0.8dBm, and optical fiber tail-end simulates breakpoint with Fresnel reflection, it is considered to which reflectivity is 4%, institute
The port Output optical power of circulator three is stated for -25dBm.Two photodetectors used detect for the 1GHz of same band in addition
Device, oscillograph used is 25GHz bandwidth, and sample rate is set to 25Gs/s.The cross-correlation function for calculating two paths of signals is eventually passed through, is obtained
To the cross-correlation curve shown in Fig. 3.It is fiber reflection point position at the peak value of cross-correlation curve, technology of the present invention is accurately surveyed
Go out 24768.94 meters of fiber lengths, by judging that the full width at half maximum of peak curve determines spatial resolution for 5.2cm.
Claims (3)
1. a kind of related optical time domain reflectometer based on all -fiber wide range chaos light source, the reflectometer includes：All -fiber chaos light
Source and relationship type optical time domain reflection system；The relationship type optical time domain reflection system includes：Adjustable attenuator, optical filter, coupling
Clutch, circulator, photodetector, oscillograph；The emergent light of all -fiber chaos light source injects relationship type optical time domain reflection
System, passes sequentially through adjustable attenuator, optical filter, coupler first, is divided into reference by the chaos optical signal of coupler
Signal and detectable signal, reference signal are directly converted to electric signal by photodetector and are gathered and stored by oscillograph；Detection letter
Number reflectometer function is realized by circulator, reflected signal is converted to after electric signal by same oscillograph by another photodetector
Gather and store；The all -fiber chaos light source includes：Raman pump light source, optoisolator, zero dispersion shift fiber, Raman pump
The pump light that Pu light source is sent passes sequentially through optoisolator, zero dispersion shift fiber.
2. a kind of related optical time domain reflectometer based on all -fiber wide range chaos light source as claimed in claim 1, its feature exists
In the zero dispersion shift fiber length be 10~20km.
3. a kind of related optical time domain reflectometer based on all -fiber wide range chaos light source as claimed in claim 1, its feature exists
Raman pump light source is 1455nm raman pump light sources in all -fiber chaos light source.
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| CN105953784B (en) * | 2016-04-29 | 2018-09-04 | 重庆华渝电气集团有限公司 | Angular rate sensor based on chaotic signal |
| 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 |
| CN108540216B (en) * | 2018-04-23 | 2021-01-08 | 太原理工大学 | High-precision chaotic optical time domain reflectometer |
| 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 |
| CN111896138B (en) * | 2020-07-15 | 2022-01-25 | 太原理工大学 | Long-distance high-spatial-resolution distributed chaotic Raman optical fiber sensing device |
| CN112378430B (en) * | 2020-10-29 | 2022-04-22 | 太原理工大学 | Distributed optical fiber Raman sensing device and method based on chaotic laser |
| CN112461276B (en) * | 2020-11-10 | 2022-08-12 | 电子科技大学 | System and method for reducing OFDR light source nonlinear phase influence |
| 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 |
| 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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