CN104776870B - The device of remote BOTDR system temperature resolution is improved using distributed raman amplification and EDFA technologies - Google Patents
The device of remote BOTDR system temperature resolution is improved using distributed raman amplification and EDFA technologies Download PDFInfo
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- CN104776870B CN104776870B CN201410826140.4A CN201410826140A CN104776870B CN 104776870 B CN104776870 B CN 104776870B CN 201410826140 A CN201410826140 A CN 201410826140A CN 104776870 B CN104776870 B CN 104776870B
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Abstract
The invention discloses a kind of device that remote BOTDR system temperature resolution is improved using distributed raman amplification and EDFA technologies, which includes optical fiber sensing system device of the present invention, utilizes relevant experimental data and utilization this method and the obtained temperature resolution comparison diagram of conventional method that built BOTDR system measurement obtains.Apparatus of the present invention can improve the temperature resolution of remote BOTDR system.
Description
Technical field
The present invention relates to a kind of remote BOTDR system temperature resolution is improved using distributed raman amplification and EDFA technologies
The device of rate.
Background technology
In recent years, the Distributed Optical Fiber Sensing Techniques based on spontaneous brillouin scattering have caused the extensive pass of people
Note, it has huge market potential, which needs to carry out the prison of long range in fields such as pipeline, cable, bridge, railways
It surveys, however, the power of spontaneous brillouin scattering signal is but very weak, with the increase of distance sensing, the consumption of pumping can cause
The power of brillouin scattering signal can be weaker, and the signal-to-noise ratio of system will become worse and worse, the temperature resolution of system
It can become lower and lower.Therefore, how to improve the temperature resolution of remote BOTDR system becomes distributing optical fiber sensing skill
One research hotspot of art.
In order to improve the distance sensing of BOTDR system and temperature resolution, distributed raman amplification technology may be used, but
The peak power for being continuous Raman pumping laser is to have certain limitations, and distance sensing can not possibly be far, with distance sensing
Increase, in the end of sensor fibre, temperature resolution can be very low.At present, all may be used using coding techniques and system averaging method
To improve the signal-to-noise ratio of system, and then distance sensing is improved, still, coding techniques must be certain to the improvement of system signal noise ratio
Code length within the scope of, after the length more than forced coding, with the increase of code length, using coding techniques not
The signal-to-noise ratio of raising system can be further continued for, temperature resolution can not improve again, and the system of encoded signal is responded and is carried out
When demodulation, it is more complicated to be implemented on hardware；System sensing distance is being improved using system averaging method
Meanwhile but considerably increase the time of measuring of system.
Invention content
The purpose of the present invention is to provide a kind of remote BOTDR systems are improved using distributed raman amplification and EDFA technologies
The advantages of device of system temperature resolution, the present apparatus decays with thermal compensation signal, improves long range systems temperature resolution.
In order to realize above-mentioned technical purpose, the technical scheme is that：
A kind of device that remote BOTDR system temperature resolution is improved using distributed raman amplification and EDFA technologies,
Including Raman fiber generating device of laser, direct impulse light generating device, wavelength division multiplexer, optical circulator, the first fiber grating,
Second fiber grating, third fiber grating, coupler, photodetector, the first sensor fibre, the second sensor fibre, the first coupling
Clutch, the second coupler, the first EDFA, electrooptic modulator, mixing filter, spectrum analyzer, AD data acquisition units and aobvious
Showing device, above-mentioned detection light generating device rear end add optoisolator, prevent reflected light from light source is interfered and being damaged, so
Can amplify light intensity into the combination of optical attenuator and the first EDFA afterwards, fine-tune luminous power, finally by Polarization Controller,
First sound-optic modulator, circulator and the combination of matched FBG can be consistent into low noise, polarization direction by optical signal modulation
Pulsed light, the output terminal of direct impulse light generating device connect the first port of the first optical circulator, and the of the first optical circulator
The output terminal of Two-port netwerk and first sound-optic modulator connects wavelength division multiplexer respectively, and the third port of the first optical circulator passes through
One fiber grating connects the first port of the second optical circulator, and the second port of the second optical circulator connects the second fiber grating,
The third port of second optical circulator connects an input terminal of the second coupler by third fiber grating, and wavelength division multiplexer connects
It connects the first coupler and light all the way is separated by an output terminal and be introduced into electrooptic modulator, it is carried out with the frequency of 11GHz
Modulation, for generating the local light after frequency displacement, and be output to another input terminal of the second coupler, the first coupler it is another
Output terminal connects the first EDFA, the first EDFA the second sensor fibres of connection, the output of the second coupler by the first sensor fibre
After end connection photodetector, connection display fills after mixing filter, spectrum analyzer, AD data acquisition units successively
It puts.
The device, the length of first sensor fibre are not more than 50km.
The device, the length of second sensor fibre are not more than 50km.
The centre wavelength of the device, the first fiber grating and third fiber grating and the wavelength of detection light generating device
Identical, bandwidth is not more than 0.2nm.
The device, the centre wavelength of the second fiber grating is identical with the wavelength for detecting light generating device, bandwidth 1-
2nm。
The device, the direct impulse light generating device include it is sequentially connected detection light generating device, light every
From device, optical attenuator, the 2nd EDFA, Polarization Controller and first sound-optic modulator, the Raman fiber generating device of laser
Including sequentially connected Raman fiber lasers and second sound-optic modulator, and first sound-optic modulator and second sound-optic modulator
Keep synchro switch state.
The technical effects of the invention are that by using distributed raman amplification technology, in the specific position of sensor fibre
Upper addition EDFA, then connects sensor fibre again, then from the head end of sensor fibre to tail end, spontaneous brillouin scattering therein
The power of signal can keep certain intensity, and the temperature resolution of sensor fibre distal end can only be dropped with the increase of distance sensing
Low small part.Meanwhile filtered out backward Rayleigh scattering signal, reduced noise power, it is weakened in backward cloth
The interference of deep scattered signal extraction.
The invention will be further described below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 the structural representation of present invention；
Fig. 2 is the specific design method that the second sensor fibre verified to the present invention connects；
Fig. 3 is the backward Brillouin scattering signal graph near sensor fibre heating region in the embodiment of the present invention；
Fig. 4 is the temperature resolution contrast schematic diagram of conventional method and the method for the present invention along sensor fibre.
Specific embodiment
Referring to Fig. 1, the present invention includes 1480nm Raman fiber lasers, 1535nm detections light generating device, WDM (wavelength-divisions
Multiplexer), optical circulator, the first fiber grating, the second fiber grating, third fiber grating, coupler, photodetector, light
Isolator, VOA (optical attenuator), Polarization Controller (PS), acousto-optic modulator (AOM), electrooptic modulator (EOM), the first sensing
Optical fiber, the second sensor fibre, EDFA, heating unit, spectrum analyzer, it is above-mentioned by 1535nm detections light, 1480nm Raman lights
The pulsed light that polarization direction is consistent caused by fibre laser and some optical devices, luminous power is sufficiently large divides by coupler 1
Go out light all the way to be introduced into electrooptic modulator, it is modulated with the frequency of 11GHz, for generating the local after frequency displacement
Light, another way light is after sensor fibre, the EDFA of one section of 45km amplifies, then heated device enters another part sensor fibre
In, light along sensor fibre propagate when, from 2 ports of circulator 1 return backscatter signal, 3 ports output, subsequently into reflection
In grating, the combination of circulator and matched FBG can filter out ASE noises caused by EDFA and backward Rayleigh scattering signal, go
Pulsed optical signals after making an uproar carry out the reflected backward Brillouin scattering light of sensor fibre and local frequency displacement light through coupler 2
The relevant detection of light, and pass through photodetector and be transformed into electric signal, is then mixed with microwave local oscillation, to the electric signal into
Row down-converted after being filtered to the signal, finally acquires, by issuing certainly via spectrum analyzer analyzer, AD data
In deep pool reflection frequency shift amount be converted into corresponding temperature and stress variation, output is shown on graphic interface.Light is detected to generate
The output light of device passes through the processing of associated op-tics, is transformed into the consistent pulsed light of polarization state, is connected to the first ring of light shape
The first port of device, second port and output terminal of the Raman fiber lasers through AOM of the first optical circulator are respectively connected to wave
Division multiplexer, the third port of the first optical circulator are connected to the first port of the second optical circulator by the first fiber grating,
The second port of second optical circulator connects the second fiber grating, and the third port of the second optical circulator passes through third optical fiber light
The reflected Brillouin scattering of sensor fibre and local frequency displacement light are carried out the relevant detection of light, extraction through coupler by grid
Backward Brillouin scattering signal.Wherein the length of the first sensor fibre is not more than 50km, the second sensor fibre in more than device
Length be not more than 50km.The centre wavelength of first fiber grating and third fiber grating and the wavelength phase for detecting light generating device
Together, bandwidth is not more than 0.2nm.The centre wavelength of second fiber grating is identical with the wavelength for detecting light generating device, bandwidth 1-
2nm。
Referring to Fig. 2, in order to which the effect to the present invention verifies that the first sensor fibre takes 45km long, the second sensor fibre
43.2km long is taken, and heating unit is added in the second sensor fibre, heating unit is mounted on the 39.4- of the second sensor fibre
At 42.6km, 3.2km, and temperature is heated to about 80 DEG C altogether.The wavelength of Raman fiber lasers takes 1480nm, direct impulse
The wavelength of module takes 1535nm, after the light that Raman fiber lasers and direct impulse module issue respectively is by wavelength division multiplexer
45km sensor fibres are coupled into, can gradually be decayed with the increase of distance sensing when light transmits in sensor fibre, are being passed
At photosensitive fibre 45km, the sensor fibre that rear end will be connected to after optical signal amplification by EDFA, amplified optical signal is in optical fiber
After relaying resumes defeated 39.4km, by the sensor fibre of the 3.2km of heating devices heat rear end, optical signal passes through this section of optical fiber
Afterwards, finally enter the sensor fibre of the 0.6km of tail end, optical signal can all be generated when being transmitted in each section of optical fiber after to spontaneous
Brillouin scattering signal, which will export from 3 ports of circulator 1, when backscatter signal enters circulator 2, FBG1
Centre wavelength with FBG3 is 1534.9nm, and bandwidth 0.2nm, the two FBG can filter out the Rayleigh in backscatter signal
Light is scattered, and passes through spontaneous brillouin scattering light, the centre wavelength of FBG2 is 1534.96nm, bandwidth 1nm, passes through Raman
Pumping the spontaneous Raman noise of the amplification generated can be filtered out by FBG2, after 3 FBG, spontaneous brillouin scattering signal
Will brillouin scattering signal be extracted, experimental result of the invention and analysis are to such as Fig. 3,4 institutes by heterodyne processing method
Show.
Fig. 3 is using the obtained backward Brillouin scattering signal width near sensor fibre heating region of the invention
Value, on the position of sensor fibre 84.4km~87.6km, can be clearly observed the amplitude of backward Brillouin scattering signal
Variation, near sensor fibre 87km, the temperature resolution of BOTDR system is about 5.7 DEG C.
Three curves in Fig. 4 represent the temperature using three kinds of obtained BOTDR systems of method as illustrated in the drawing respectively
Resolution ratio is spent, the power for keeping direct impulse light is 20mw or 100mv, acquired in the case of no addition light amplification
The temperature resolution of BOTDR system is all low-down, and with the increase of sensor fibre distance, the temperature resolution of system
Decline is very fast, and temperature resolution is with the increase of distance sensing obtained by using the method for the present invention, and decline is very slow, favorably
In significantly increasing system performance, the temperature resolution of remote BOTDR system is improved.
Claims (5)
1. a kind of device that remote B0TDR system temperatures resolution ratio is improved using distributed raman amplification and EDFA technologies,
It is characterized in that, including Raman fiber generating device of laser, direct impulse light generating device, wavelength division multiplexer, optical circulator, first
Fiber grating, the second fiber grating, third fiber grating, coupler, photodetector, the first sensor fibre, the second sense light
Fibre, the acquisition of the first coupler, the second coupler, the first EDFA, electrooptic modulator, mixing filter, spectrum analyzer, AD data
Unit and display device, detection light generating device rear end add optoisolator, prevent reflected light from light source is interfered and being damaged,
Combination subsequently into optical attenuator and the 2nd EDFA can amplify light intensity, fine-tune luminous power, finally by Polarization Control
Device, second sound-optic modulator, circulator and the combination of matched FBG can be consistent into low noise, polarization direction by optical signal modulation
Pulsed light, the output terminal of direct impulse light generating device connects the first port of the first optical circulator, the first optical circulator
The output terminal of second port and first sound-optic modulator connects wavelength division multiplexer respectively, and the third port of the first optical circulator passes through
First fiber grating connects the first port of the second optical circulator, and the second port of the second optical circulator connects the second optical fiber light
Grid, the third port of the second optical circulator connect an input terminal of the second coupler, wavelength-division multiplex by third fiber grating
Device connects the first coupler and separates light all the way by an output terminal and is introduced into electrooptic modulator, with the frequency of 11GHz to it
It is modulated, for generating the local light after frequency displacement, and is output to another input terminal of the second coupler, the first coupler
Another output terminal by the first sensor fibre connect the first EDFA, the first EDFA the second sensor fibres of connection, the second coupler
After output terminal connection photodetector, display is connected after mixing filter, spectrum analyzer, AD data acquisition units successively
Device, the direct impulse light generating device include it is sequentially connected detection light generating device, optoisolator, optical attenuator,
2nd EDFA, Polarization Controller and second sound-optic modulator, the Raman fiber generating device of laser include sequentially connected
Raman fiber lasers and first sound-optic modulator, and first sound-optic modulator and second sound-optic modulator keep synchro switch shape
State.
2. the apparatus according to claim 1, which is characterized in that the length of first sensor fibre is not more than 50km.
3. the apparatus according to claim 1, which is characterized in that the length of second sensor fibre is not more than 50km.
4. the apparatus according to claim 1, which is characterized in that the centre wavelength of the first fiber grating and third fiber grating
Identical with the wavelength for detecting light generating device, bandwidth is not more than 0.2nm.
5. the apparatus according to claim 1, which is characterized in that the centre wavelength of the second fiber grating generates dress with detection light
The wavelength put is identical, bandwidth l-2nm.
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| RU2755773C1 (en) * | 2021-02-01 | 2021-09-21 | федеральное государственное бюджетное образовательное учреждение высшего образования «Оренбургский государственный университет» | Brillouin reflectometer |
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| CN204575099U (en) * | 2014-12-25 | 2015-08-19 | 长城信息产业股份有限公司 | Distributed raman amplification and EDFA technology is utilized to improve the device of remote BOTDR system temperature resolution |
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| US8139951B2 (en) * | 2008-06-26 | 2012-03-20 | Igor Samartsev | Fiber-optic long-haul transmission system |
| WO2012003391A2 (en) * | 2010-06-30 | 2012-01-05 | The Regents Of The University Of California | Method and device for fast tuning of optical sources |
| CN102322884A (en) * | 2011-08-09 | 2012-01-18 | 中国计量学院 | Merge the very-long-range pulse code distribution type fiber-optic Brillouin sensing device of optical fiber Brillouin frequency shifter |
| CN102506912A (en) * | 2011-09-29 | 2012-06-20 | 北京航空航天大学 | Optical fiber distributed disturbance sensor |
| CN103376124A (en) * | 2012-04-17 | 2013-10-30 | 扬州森斯光电科技有限公司 | Brillouin optical time domain analyzer |
| CN103364106B (en) * | 2013-07-16 | 2015-07-29 | 扬州森斯光电科技有限公司 | A kind of Brillouin optical time domain analysis sensor-based system based on the pumping of overlength loop laser |
| CN103727969B (en) * | 2014-01-10 | 2016-08-17 | 电子科技大学 | Based on delay pulse Raman amplifiction distributed sensing system |
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| RU2755773C1 (en) * | 2021-02-01 | 2021-09-21 | федеральное государственное бюджетное образовательное учреждение высшего образования «Оренбургский государственный университет» | Brillouin reflectometer |
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Address after: 410100 No. 39, Jian Shan Road, Changsha economic and Technological Development Zone, Hunan Co-patentee after: Changsha HCC HIDEN Technology Co., Ltd. Patentee after: GreatWall Information Industry Co., Ltd. Co-patentee after: Hunan the Great Wall Hai Dun Optical Fiber Technology Co., Ltd. Address before: 410100 No. 39, Jian Shan Road, Changsha economic and Technological Development Zone, Hunan Co-patentee before: Changsha HCC HIDEN Technology Co., Ltd. Patentee before: GreatWall Information Industry Co., Ltd. Co-patentee before: Hunan Haidun Optical Fiber Sensing Technology Engineering Laboratory Co., Ltd. |
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Effective date of registration: 20190814 Address after: 410205 A076, Headquarters Building of Zhongdian Software Park, 39 Jianshan Road, Changsha High-tech Development Zone, Changsha City, Hunan Province Patentee after: Hunan the Great Wall Hai Dun Optical Fiber Technology Co., Ltd. Address before: 410100 No. 39 Jianshan Road, Changsha Economic and Technological Development Zone, Hunan Province Co-patentee before: Changsha HCC HIDEN Technology Co., Ltd. Patentee before: GreatWall Information Industry Co., Ltd. Co-patentee before: Hunan the Great Wall Hai Dun Optical Fiber Technology Co., Ltd. |