CN102538844A - Method and system for improving sensing performance of long-distance Brillouin optical time domain analysis system - Google Patents
Method and system for improving sensing performance of long-distance Brillouin optical time domain analysis system Download PDFInfo
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Abstract
The invention discloses a method and system for improving sensing performance of a long-distance Brillouin optical time domain analysis system. On the basis of the existing long-distance Brillouin optical time domain analysis system which uses a first-order Raman amplification technique, a pair of optical fiber gratings with peak reflectivity being larger than 80 percent and consistent central reflection wavelength are fused on the two sides of sensing optical fibers to form a long-distance laser resonant cavity. Laser generated by the laser resonant cavity is used as a second-order Raman pump and a first-order Raman pump to simultaneously take an effect of amplifying sensing signals. Compared with a Brillouin sensing system which is based on the first-order Raman amplification, under the conditions of the same pump power, the method and the system provided by the invention have the advantages that higher grains can be obtained and the pump efficiency is improved; the sensing signals are distributed more smoothly along the optical fibers; when the system is used for long-distance temperature/stress sensing, the spatial resolution, the measurement accuracy and the sensitivity of the monitoring system can be greatly improved; and the sensing performance is obviously improved at a low cost without increasing an additional second-order pump light source.
Description
Technical field
The present invention relates to the optical fiber technology field, be specifically related to a kind of based on the long method and system of Raman mixing amplifying technique raising apart from the Brillouin optical time domain analysis system sensing capabilities.
Background technology
In temperature, strain measurement, reach measuring accuracy, measurement range and spatial resolution based on the distributing optical fiber sensing technology of Brillouin scattering and all be higher than other sensing technology, therefore this technology has wide practical use at aspects such as building structure monitoring, petroleum pipe line safety detection, electric power facility health detection, fire alarms.According to whether having utilized stimulated Brillouin effect, generally be divided into the Brillouin light Time Domain Reflectometry and take into account two kinds in Brillouin optical time domain analysis appearance, the former utilizes the spontaneous brillouin scattering phenomenon, can carry out single-ended measurement, but detectable signal a little less than, detection range is limited; The latter utilizes the stimulated Brillouin scattering phenomenon, and detectable signal is stronger, and distance sensing is far away.
Along with the increase of distance sensing, receiving fibre loss and Brillouin to survey light consumption influences, and makes the pulsed light energy sharply descend, thus the distance sensing of restriction total system.Improving the most direct method of distance sensing is the power that increases direct impulse light, the centralized amplifying technique of the general employing of traditional Brillouin optical time domain analysis system, and promptly Brillouin's pumping wave gets into the preceding erbium doped optical fibre light amplifier (EDFA) of using of optical fiber with Pulse Power Magnification; Because too high pulse energy causes the reinforcement of nonlinear effect; Had a strong impact on the signal to noise ratio (S/N ratio) of system, make the power of pulsed light infinitely not increase, and pumping light power has been only stronger at the optical fiber front end; And in the optical fiber rear end; Receive fibre loss and Brillouin to survey the consumption of light, intensity sharply descends, and has restricted the Measurement Resolution of optical fiber rear end.Influenced by this, based on the Brillouin optical time domain analysis system distance sensing＜30km of lump type amplifying technique.
On the other hand; Because systemic resolution and direct impulse width are inversely proportional to, along with the further raising of system to spatial resolution and measuring distance requirement, pulse width will more and more narrow; The dutycycle of signal is also more and more littler, thereby causes the rapid decline of signal to noise ratio (S/N ratio).
Between above factor; The general mode that adopts centralized and distributed amplification to combine; Promptly utilize the EDFA pulse signals tentatively to amplify earlier at front end; Utilizing distributed Raman amplifying technique paired pulses light to carry out secondary again amplifies; Alahbabi M.N. in 2005 and his team have reported the distributed Brillouin's temperature-sensing system that utilizes the Raman amplifying technique; Reached the distance (seeing Alahbabi M.N.150-km-range distributed temperature sensor based on coherent detection of spontaneous Brillouin backscatter and in-line Raman amplification [J] .J.Opt.Soc.Am.B, 2005) of 150km, this has weakened signal power front and back end skewness to a certain extent.But long distance (＞50km) in the Brillouin light sensor-based system, because the power and the Raman gain coefficienct of raman pump are exponential damping along optical fiber, make this method can not thoroughly eliminate the distribute power uneven phenomenon, and distance sensing is longer, fluctuation is more serious.Consequently on transducing signal distributes, occurred one on a large scale, the measurement " blind area " of low signal-to-noise ratio.On the other hand, the efficient of single order raman pump is lower, and in the long-distance sensing system, very high to the requirement of raman pump power, thus system cost seriously improved.
2004; J.D.Ania-Castanon has reported that the extra long distance that utilizes Fiber Bragg Grating FBG and Raman to mix the amplifying technique realization can't harm the transport communication system and (sees J.D.Ania-Castanon; Quasi-lossless transmission using second-order Raman amplification and fiber Bragg gratings; Opt.Exp., 12).Than other amplifying techniques, Raman mixes amplifying technique and has advantages such as the gain spectral (amplifying when can realize the C+L wave band), gain spectrum flattening, low noise of broad, high pumping utilization factor and low cost.First Raman is mixed amplifying technique between above advantage this patent and be applied in existing Brillouin optical time domain analysis system; When effectively having prolonged distance sensing, controlled the cost of system, will in growing, obtain extremely important application apart from Brillouin optical time domain analysis system.
Summary of the invention
Problem to be solved by this invention is: how a kind of long distance of mix amplifying based on Raman is provided, and (>=50km) Brillouin optical time domain analysis sensor-based system effectively improves raman pump efficient; Be applied to length apart from temperature/strain sensing, make the distribution of transducing signal more smooth, significantly improve precision and the spatial resolution of measuring.
Technical matters proposed by the invention is to solve like this: provide a kind of and mix the long method apart from the Brillouin optical time domain analysis system sensing capabilities of amplifying technique raising based on Raman, this method may further comprise the steps:
A, based on first double to the Brillouin optical time domain analysis sensor-based system that Raman amplifies, a pair of peak reflectivity＞80% is set, the fiber grating that centre wavelength is consistent;
B, with fiber grating to being fused to the sensor fibre both sides, constitute single order and mix with the second order Raman and amplify sensor-based system, be used for simultaneously flashlight being carried out Raman and mix amplification;
C, inject to survey light, microwave generator is carried out frequency sweep, draw power-Brillouin shift-,, draw the temperature/Strain Distribution of sensor fibre through the Lorentz curve match apart from three-dimensional plot to sensor fibre.
Further, in the steps A, first double is 13XX-14XX nm to raman pumping wavelength;
Further, among step B and the C, peak reflectivity＞80% that fiber grating is right, centre wavelength is consistent, and centre wavelength is positioned near the one-level Stokes wavelength of single order raman pumping wavelength, between the two distance＜100nm.
Further, step B further comprises: wavelength division multiplexer (WDM) is connected on the both sides of sensing optic cable respectively, is used for that Brillouin is surveyed light, Brillouin's pump light and said 13XX-14XX single order raman pump source 14 and is coupled into sensor fibre; 13XX-14XX single order raman pump source 14 is used to produce the single order Raman and amplifies wavelength 13XX-14XXnm; Fiber grating is used to constitute long apart from laserresonator to 20, the laser of its generation amplifies transducing signal with the single order raman pump source as the second order raman pump simultaneously.
The invention also discloses a kind of system that improves long apart from the Brillouin optical time domain analysis system sensing capabilities; Comprise Brillouin optical time domain analysis sensor-based system and sensor fibre that first double is amplified to Raman; It is characterized in that; This system in first double on the basis of the Brillouin optical time domain analysis sensor-based system that Raman amplifies, a pair of peak reflectivity of sensor fibre both sides welding greater than 80%, the fiber grating of foveal reflex consistent wavelength, constitute one long apart from laserresonator; The laser that this laserresonator produces plays amplification to transducing signal as the second order raman pump with the single order raman pump simultaneously.
Further, said length comprises apart from laserresonator: WDM 15,13XX-14XX single order raman pump source 14 and fiber grating are to 20; Wherein, said WDM 15 is used for that Brillouin is surveyed light, Brillouin's pump light and said 13XX-14XX single order raman pump source 14 and is coupled into sensor fibre; 13XX-14XX single order raman pump source 14 is used to produce the single order Raman and amplifies wavelength 13XX-14XXnm; Fiber grating is used to constitute long apart from laserresonator to 20, the laser of its generation amplifies transducing signal as second order raman pump and single order raman pump source simultaneously.
Further, said first double comprises to the Brillouin optical time domain analysis sensor-based system that Raman amplifies: laser instrument 1, first isolator 2, coupling mechanism 3, first Polarization Controller 4, second Polarization Controller 16, first electrooptic modulator 6, second electrooptic modulator 17, scrambler 8, first Erbium-Doped Fiber Amplifier (EDFA) 9, second Erbium-Doped Fiber Amplifier (EDFA) 18, optical circulator 12, detector 10, tunable optic filter 11, data acquisition processing system 7, waveform generator 5, microwave generator 13 etc.; Wherein, said laser instrument 1 is used to produce Brillouin's pumping and involves probing wave, light source live width＜1MHz, and power is greater than 10dBm; First isolator 2 links to each other with laser instrument 1, is used to the damage of avoiding reflected light that laser instrument is caused; Coupling mechanism 3 links to each other with said first isolator 2, is used for the light beam that said laser instrument produces is divided into two bundles; First Polarization Controller 4 links to each other with coupling mechanism 3 respectively with second Polarization Controller 16, is used to overcome the polarization correlated of said electrooptic modulator; First electrooptic modulator 6 is used to produce Brillouin's pump light, and bandwidth is 2.5GHz; The Brillouin that second electrooptic modulator 17 is used to produce the about 10-11GHz of frequency displacement surveys light, and its bandwidth is 10GHz; Scrambler 8 links to each other with first electrooptic modulator 6, is used to suppress the polarization correlated of brillouin gain, disturbs inclined to one side speed＞1KHz, output polarization degree＜5%; First Erbium-Doped Fiber Amplifier (EDFA) 9 links to each other with scrambler 8, is used to amplify Brillouin's pump light; Second Erbium-Doped Fiber Amplifier (EDFA) 18 links to each other with second electrooptic modulator 17, is used to amplify Brillouin and surveys light; Second isolator 19 links to each other with second Erbium-Doped Fiber Amplifier (EDFA) 18, is used to the damage of avoiding reflected light that Erbium-Doped Fiber Amplifier (EDFA) is caused; Optical circulator 12 is used for Brillouin's pump light is coupled into sensor fibre, will survey optically-coupled through the Brillouin who amplifies simultaneously and advance said tunable optic filter 11; Tunable optic filter 11 links to each other with optical circulator 12, is used for filtering amplified spont-aneous emission noise, improves signal to noise ratio (S/N ratio), three dB bandwidth＜0.1nm; Waveform generator 5 links to each other with first electrooptic modulator 6, is used to produce the pump light that is fit to system; Microwave generator 13 links to each other with second electrooptic modulator 17, is used to produce the 10-11GHz microwave signal to drive second electrooptic modulator 17, carrier frequency 10-11GHz; Waveform generator 5, microwave generator 13 are connected with data acquisition processing system 7 respectively; Data acquisition processing system 7 links to each other with tunable optic filter 11 through detector 10, and it comprises data collecting card and signal processing system, is used to accomplish data acquisition, handles the control that reaches said waveform generator 5, microwave generator 13.
Beneficial effect of the present invention: among the present invention, the laser (as the second order raman pump) that laserresonator produces plays amplification to transducing signal simultaneously with the single order raman pump.Compare with the Brillouin sensing system of amplifying based on the single order Raman, under same pump power condition, this method can obtain higher gain, has improved pumping efficiency; Transducing signal is more smooth along the distribution of optical fiber; Be used for length apart from temperature/strain sensing, can significantly improve spatial resolution, measuring accuracy and the sensitivity of monitoring system; Obvious improvement with very little cost (need not to increase extra second order pump light source) acquisition sensing capabilities possesses certain practicality.
Description of drawings
Fig. 1 is that length of mixing amplification based on Raman provided by the present invention is apart from Brillouin optical time domain analysis sensor-based system structural drawing;
Wherein, 1, laser instrument, 2, first isolator, 3, coupling mechanism, 4, first Polarization Controller; 5, waveform generator, 6, first electrooptic modulator, 7, data acquisition processing system, 8, scrambler; 9, first Erbium-Doped Fiber Amplifier (EDFA), 10, detector, 11, tunable optic filter, 12, optical circulator; 13, microwave generator, 14,13XX-14XXnm single order raman pump source, 15, wavelength division multiplexer (WDM), 16, second Polarization Controller; 17, second electrooptic modulator, 18, second Erbium-Doped Fiber Amplifier (EDFA), 19, second isolator, 20, fiber grating is right;
Fig. 2 is a two-stage pump light Raman gain coefficienct spectrum synoptic diagram.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and practical implementation that the present invention is described in further detail below.
Fig. 1 is that length of mixing amplification based on Raman provided by the present invention is apart from Brillouin optical time domain analysis sensor-based system structural drawing; As shown in Figure 1; Length of mixing amplification based on Raman of the present invention comprises Brillouin optical time domain analysis sensor-based system and Raman mixing amplification sensor-based system that first double is amplified to Raman apart from the Brillouin optical time domain analysis sensor-based system; Said first double specifically comprises to the Brillouin optical time domain analysis sensor-based system that Raman amplifies: laser instrument 1, first isolator 2, coupling mechanism 3, first Polarization Controller 4, second Polarization Controller 16, first electrooptic modulator 6, second electrooptic modulator 17, scrambler 8, first Erbium-Doped Fiber Amplifier (EDFA) 9, second Erbium-Doped Fiber Amplifier (EDFA) 18, optical circulator 12, detector 10, tunable optic filter 11, data acquisition processing system 7, waveform generator 5, microwave generator 13; Wherein, said laser instrument 1 is used to produce Brillouin's pumping and involves probing wave, light source live width＜1MHz, and power is greater than 10dBm; First isolator 2 links to each other with laser instrument 1, is used to the damage of avoiding reflected light that laser instrument is caused; Coupling mechanism 3 links to each other with said first isolator 2, is used for the light beam that said laser instrument produces is divided into two bundles; First Polarization Controller 4 links to each other with coupling mechanism 3 respectively with second Polarization Controller 16, is used to overcome the polarization correlated of said electrooptic modulator; Electrooptic modulator adopts two altogether among the present invention, and first electrooptic modulator 6 is used to produce Brillouin's pump light, and bandwidth is 2.5GHz; The Brillouin that second electrooptic modulator 17 is used to produce the about 10-11GHz of frequency displacement surveys light, and its bandwidth is 10GHz; Scrambler 8 links to each other with first electrooptic modulator 6, is used to suppress the polarization correlated of brillouin gain, improves Measurement Resolution, disturbs inclined to one side speed＞1KHz, output polarization degree＜5%; Erbium-Doped Fiber Amplifier (EDFA) adopts two altogether among the present invention, and first Erbium-Doped Fiber Amplifier (EDFA) 9 links to each other with scrambler 8, is used to amplify Brillouin's pump light; Second Erbium-Doped Fiber Amplifier (EDFA) 18 links to each other with 10GHz second electrooptic modulator 17, is used to amplify Brillouin and surveys light; Second isolator 19 links to each other with second Erbium-Doped Fiber Amplifier (EDFA) 18, is used to the damage of avoiding reflected light that Erbium-Doped Fiber Amplifier (EDFA) is caused; Optical circulator 12 is used for Brillouin's pump light is coupled into sensor fibre, will survey optically-coupled through the Brillouin who amplifies simultaneously and advance said tunable optic filter 11; Tunable optic filter 11 links to each other with optical circulator 12, is used for filtering amplified spont-aneous emission noise, improves signal to noise ratio (S/N ratio), three dB bandwidth＜0.1nm; Waveform generator 5 links to each other with first electrooptic modulator 6, is used to produce the pump light that is fit to system; Microwave generator 13 links to each other with second electrooptic modulator 17, is used to produce the 10-11GHz microwave signal to drive second electrooptic modulator 17, carrier frequency 10-11GHz; Waveform generator 5, microwave generator 13 are connected with data acquisition processing system 7 respectively; Data acquisition processing system 7 links to each other with tunable optic filter 11 through detector 10, and it comprises data collecting card and signal processing system, is used to accomplish data acquisition, handles the control that reaches said waveform generator 5, microwave generator 13.
Said Raman mixes the amplification sensor-based system and comprises: WDM 15,13XX-14XX single order raman pump source 14 and fiber grating are to 20; Wherein, said WDM 15 is used for that Brillouin is surveyed light, Brillouin's pump light and said 13XX-14XX single order raman pump source 1 and is coupled into sensor fibre; 13XX-14XX single order raman pump source 14 is used to produce the single order Raman and amplifies wavelength 13XX-14XXnm; Fiber grating is used to constitute long apart from laserresonator to 20, the laser of its generation (as the second order raman pump) amplifies transducing signal with the single order raman pump source simultaneously, improves the spatial resolution and the precision of pumping efficiency and long-distance sensing.
Provided by the invention based on the long method apart from the Brillouin optical time domain analysis system sensing capabilities of Raman mixing amplifying technique raising, this method may further comprise the steps:
A builds a Brillouin optical time domain analysis sensor-based system that amplifies to Raman based on first double;
B makes a pair of peak reflectivity＞80%, the fiber grating that centre wavelength is consistent;
C to being fused to the sensor fibre both sides, constituting fiber grating single order and second order Raman and mixes the amplification sensor-based system;
D inject to survey light to optical fiber, and microwave generator is carried out frequency sweep, draws power-Brillouin shift-apart from three-dimensional plot, through the Lorentz curve match, draw the temperature/Strain Distribution of sensor fibre.
Fig. 2 is a two-stage pump light Raman gain coefficienct spectrum synoptic diagram.Among this figure, two-way pumping pumping light wavelength is 1480nm, and the centre wavelength of a pair of Fiber Bragg Grating FBG is designed near 1 grade of stokes light (1560nm) of pumping pumping, and grating and optical fiber have formed a resonator cavity and formed laser on this wavelength.
Angle from gain; In 13.2～16THz frequency range apart from pumping pump light 1480nm; The Raman gain that the pumping pump light forms has the peak of a broad, and also can carry out the Raman gain compensation to the flashlight in this frequency range by fiber grating to the sharp light of penetrating of 1560nm that the resonator cavity that forms produces.
Therefore the present invention carries out Raman mixing amplification to flashlight; Promptly utilizing the pumping pump light flashlight to be carried out on the single order Raman amplification basis; Using fiber grating that the resonator cavity that forms is produced to swash again penetrates light (as the second order raman pump) and simultaneously flashlight is amplified; To amplify ability more efficient use pump light than only utilizing the single order raman pump that flashlight is carried out Raman like this; Obtain higher Raman gain, on longer distance sensing, obtain high spatial resolution and high-precision temperature/strain sensing.
Above-mentioned preferred embodiment of the present invention and the institute's application technology principle of being merely, any technician who is familiar with the present technique field in the technical scope that the present invention discloses, the variation that can expect easily or replacement, all should be encompassed in protection scope of the present invention in.
Claims (7)
1. one kind is improved the method for growing apart from the Brillouin optical time domain analysis system sensing capabilities, and this method may further comprise the steps:
A, based on first double to the Brillouin optical time domain analysis sensor-based system that Raman amplifies, a pair of peak reflectivity＞80% is set, the fiber grating that centre wavelength is consistent;
B, with fiber grating to being fused to the sensor fibre both sides, constitute single order and mix with the second order Raman and amplify sensor-based system, be used for simultaneously flashlight being carried out Raman and mix amplification;
C, inject to survey light, microwave generator is carried out frequency sweep, draw power-Brillouin shift-,, draw the temperature/Strain Distribution of sensor fibre through the Lorentz curve match apart from three-dimensional plot to sensor fibre.
2. improve long method according to claim 1, it is characterized in that in the steps A, first double is 13XX-14XX nm to raman pumping wavelength apart from the Brillouin optical time domain analysis system sensing capabilities.
3. improve long method according to claim 1 apart from the Brillouin optical time domain analysis system sensing capabilities; It is characterized in that; Among step B and the C, peak reflectivity＞80% that fiber grating is right, centre wavelength is consistent; And centre wavelength is positioned near the one-level Stokes wavelength of single order raman pumping wavelength, between the two distance＜100nm.
4. like the method for the said raising length of one of claim 1 to 3 apart from the Brillouin optical time domain analysis system sensing capabilities; It is characterized in that; Step B further comprises: wavelength division multiplexer (WDM) (15) is connected on the both sides of sensing optic cable respectively, is used for that Brillouin is surveyed light, Brillouin's pump light and said 13XX-14XX single order raman pump source (14) and is coupled into sensor fibre; 13XX-14XX single order raman pump source (14) is used to produce the single order Raman and amplifies wavelength 13XX-14XXnm; Fiber grating is used to constitute long apart from laserresonator to (20), the laser of its generation amplifies transducing signal with the single order raman pump source as the second order raman pump simultaneously.
5. one kind is improved the system of growing apart from the Brillouin optical time domain analysis system sensing capabilities; Comprise Brillouin optical time domain analysis sensor-based system and sensor fibre that first double is amplified to Raman; It is characterized in that; This system in first double on the basis of the Brillouin optical time domain analysis sensor-based system that Raman amplifies, a pair of peak reflectivity of sensor fibre both sides welding greater than 80%, the fiber grating of foveal reflex consistent wavelength, constitute one long apart from laserresonator; The laser that this laserresonator produces plays amplification to transducing signal as the second order raman pump with the single order raman pump simultaneously.
6. according to the system of the said raising length of claim 5 apart from the Brillouin optical time domain analysis system sensing capabilities, it is characterized in that said length comprises apart from laserresonator: WDM (15), 13XX-14XX single order raman pump source (14) and fiber grating are to (20); Wherein, said WDM (15) is used for that Brillouin is surveyed light, Brillouin's pump light and said 13XX-14XX single order raman pump source (14) and is coupled into sensor fibre; 13XX-14XX single order raman pump source (14) is used to produce the single order Raman and amplifies wavelength 13XX-14XXnm; Fiber grating is used to constitute long apart from laserresonator to (20), the laser of its generation amplifies transducing signal as second order raman pump and single order raman pump source simultaneously.
7. like claim 5 or 6 said raising length system apart from the Brillouin optical time domain analysis system sensing capabilities; It is characterized in that said first double comprises to the Brillouin optical time domain analysis sensor-based system that Raman amplifies: laser instrument (1), first isolator (2), coupling mechanism (3), first Polarization Controller (4), second Polarization Controller (16), first electrooptic modulator (6), second electrooptic modulator (17), scrambler (8), first Erbium-Doped Fiber Amplifier (EDFA) (9), second Erbium-Doped Fiber Amplifier (EDFA) (18), optical circulator (12), detector (10), tunable optic filter (11), data acquisition processing system (7), waveform generator (5), microwave generator (13) etc.; Wherein, said laser instrument (1) is used to produce Brillouin's pumping and involves probing wave, light source live width＜1MHz, and power is greater than 10dBm; First isolator (2) links to each other with laser instrument (1), is used to the damage of avoiding reflected light that laser instrument is caused; Coupling mechanism (3) links to each other with said first isolator (2), is used for the light beam that said laser instrument produces is divided into two bundles; First Polarization Controller (4) links to each other with coupling mechanism (3) respectively with second Polarization Controller (16), is used to overcome the polarization correlated of said electrooptic modulator; First electrooptic modulator (6) is used to produce Brillouin's pump light, and bandwidth is 2.5GHz; The Brillouin that second electrooptic modulator (17) is used to produce the about 10-11GHz of frequency displacement surveys light, and its bandwidth is 10GHz; Scrambler (8) links to each other with first electrooptic modulator (6), is used to suppress the polarization correlated of brillouin gain, disturbs inclined to one side speed＞1KHz, output polarization degree＜5%; First Erbium-Doped Fiber Amplifier (EDFA) (9) links to each other with scrambler (8), is used to amplify Brillouin's pump light; Second Erbium-Doped Fiber Amplifier (EDFA) (18) links to each other with second electrooptic modulator (17), is used to amplify Brillouin and surveys light; Second isolator (19) links to each other with second Erbium-Doped Fiber Amplifier (EDFA) (18), is used to the damage of avoiding reflected light that Erbium-Doped Fiber Amplifier (EDFA) is caused; Optical circulator (12) is used for Brillouin's pump light is coupled into sensor fibre, will survey optically-coupled through the Brillouin who amplifies simultaneously and advance said tunable optic filter (11); Tunable optic filter (11) links to each other with optical circulator (12), is used for filtering amplified spont-aneous emission noise, improves signal to noise ratio (S/N ratio), three dB bandwidth＜0.1nm; Waveform generator (5) links to each other with first electrooptic modulator (6), is used to produce the pump light that is fit to system; Microwave generator (13) links to each other with second electrooptic modulator (17), is used to produce the 10-11GHz microwave signal to drive second electrooptic modulator (17), carrier frequency 10-11GHz; Waveform generator (5), microwave generator (13) are connected with data acquisition processing system (7) respectively; Data acquisition processing system (7) links to each other with tunable optic filter (11) through detector (10), and it comprises data collecting card and signal processing system, is used to accomplish data acquisition, handles the control that reaches said waveform generator (5), microwave generator (13).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN104089636A (en) * | 2014-07-15 | 2014-10-08 | 鞍山鹏泽伟业科技有限公司 | Double-peak stimulative type monitor based on Brillouin scattering |
| CN104655185A (en) * | 2015-01-04 | 2015-05-27 | 西南交通大学 | Time-domain analysis sensing system for coherent Brillouin light on basis of intensity modulation detecting light |
| CN107091698A (en) * | 2017-06-16 | 2017-08-25 | 苏州光格设备有限公司 | Brillouin optical time domain analysis system and method |
| 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 |
| CN108375386A (en) * | 2018-02-06 | 2018-08-07 | 广西师范大学 | A kind of the Brillouin light fiber sensor system and method for sensing of adjustable frequency displacement structure |
| CN109556659A (en) * | 2018-12-21 | 2019-04-02 | 闽南师范大学 | A kind of method and device thereof of single-ended detection Brillouin's dynamic raster sensing |
| CN109883458A (en) * | 2017-12-06 | 2019-06-14 | 北京齐瑞德光电科技有限公司 | A kind of Brillouin sensing system using novel optical microwave discriminator and novel scrambler |
| CN110440851A (en) * | 2019-07-05 | 2019-11-12 | 太原理工大学 | Long range many reference amounts measuring device and method based on Brillouin and Raman scattering |
| CN112729355A (en) * | 2020-12-24 | 2021-04-30 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Method for calibrating Raman light incidence angle suitable for atomic interferometer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0518735A1 (en) * | 1991-06-10 | 1992-12-16 | Compagnie Industrielle Des Lasers Cilas | Raman laser |
| CN101762290A (en) * | 2010-02-03 | 2010-06-30 | 电子科技大学 | Distributed Raman amplification-based Brillouin optical time domain analysis system |
| US20110044371A1 (en) * | 2007-06-29 | 2011-02-24 | Uto International Corporation | Distributed optical fiber sensor system |
-
2011
- 2011-11-22 CN CN2011103742955A patent/CN102538844A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0518735A1 (en) * | 1991-06-10 | 1992-12-16 | Compagnie Industrielle Des Lasers Cilas | Raman laser |
| US20110044371A1 (en) * | 2007-06-29 | 2011-02-24 | Uto International Corporation | Distributed optical fiber sensor system |
| CN101762290A (en) * | 2010-02-03 | 2010-06-30 | 电子科技大学 | Distributed Raman amplification-based Brillouin optical time domain analysis system |
Non-Patent Citations (1)
| Title |
|---|
| 饶云江，等: "基于拉曼组合放大的长距离光纤传输系统", 《物理学报》 * |
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