CN102109362A - Distributed optical fiber Brillouin sensor fused with optical fiber Brillouin frequency shifter - Google Patents
Distributed optical fiber Brillouin sensor fused with optical fiber Brillouin frequency shifter Download PDFInfo
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- CN102109362A CN102109362A CN 201010566517 CN201010566517A CN102109362A CN 102109362 A CN102109362 A CN 102109362A CN 201010566517 CN201010566517 CN 201010566517 CN 201010566517 A CN201010566517 A CN 201010566517A CN 102109362 A CN102109362 A CN 102109362A
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Abstract
The invention discloses a distributed optical fiber Brillouin sensor fused with an optical fiber Brillouin frequency shifter, which is a distributed optical fiber sensor manufactured through the frequency shift effect of Brillouin scattering of an optical fiber, an optical fiber broadband nonlinear optical amplification effect, the strain and temperature effects of Brillouin scattered light of coherent amplification, and an optical time domain analysis principle, and comprises a narrow linewidth single frequency optical fiber laser, three optical fiber branching devices, a pulse modulator, the optical fiber Brillouin frequency shifter, two optical fiber circulators, an erbium-doped optical fiber amplifier, a polarization mode scrambler, an optical fiber narrowband reflection filter, an optical fiber Raman pump laser, a single-mode sensing optical fiber, an optical fiber filter, a photoelectric reception amplifier module, two digital signal processors, a photoelectric heterodyne reception amplifier module and a computer, wherein the optical fiber Brillouin frequency shifter is formed by connecting the circulators, the single-mode optical fiber and the optical fiber Fabry-Perot (F-P) filter in turn. The sensor has a simple structure, low price and high measuring accuracy and stability.
Description
Technical field
The present invention relates to distribution type fiber-optic Brillouin sensing device, especially merge the distribution type fiber-optic Brillouin sensing device of optical fiber Brillouin frequency shifter.
Background technology
In the optical fiber Brillouin light time domain analyzer field, Zhang Zaixuan proposes a kind of novel " optical fiber Brillouin light time domain analyzer " (Chinese patent: the ZL200810063711.8) optical fiber Brillouin light time domain analyzer made from strain, temperature effect and the light time domain analysis principle of fiber broadband nonlinear optical enlarge-effect and the relevant Brillouin scattering that amplifies, solved in the Brillouin light time domain analyzer of inventions such as T.Horiguchi the difficult problem of the frequency lock of arrowband detecting laser and arrowband pump laser.In order to improve the measuring accuracy of Brillouin light time domain analyzer (BOTDA) and Brillouin light time-domain reflector (BOTDR), Chinese scholars (GabrieleBolognini, Marcelo A.Soto, and Fabrizio Di Pasquale, IEEE PHOTONICSTECHNOLOGY LETTERS, 2009,21 (20): 1523-1525; Chinese patents such as Zhang Zaixuan: ZL200710156868.0, ZL 200810063711.8; Mohammad Belal, Yuh Tat Cho, MortenIbsen and Trevor P Newson, Meas.Sci.Technol.2010,21,015204 (7pp); Song tries to gain equality, Chinese laser, 2010,37 (3): 757-762; The patent of invention that Lu Yuangang etc. propose, Granted publication number: CN100504309C) adopt microwave generator or reduce local laser signal (v by electric light or acousto-optic modulator microwave frequency shifter etc.
0) technical scheme of frequency, realize coherent detection technology, because the frequency (v of Brillouin's phonon of optical fiber
B) be about 11GHz, adopt the optical fiber Brillouin echoed signal (v that has strain or temperature information
0-v
B ') and local laser signal (v
0) the heterodyne Coherent Detection is in microwave ten gigahertz (GHZ) sesame frequency ranges.But, big in microwave region (11GHz) electronics detection difficulty, and very expensive; Chen Fang, Wan Shengpeng proposes " sensor-based system that two coherent fiber heterodynes detect Brillouin shift " scheme (sensor and micro-system, 2006,47 (8): 18-23), employing is same series-produced with sensor fibre, 10.3km the optical fiber that parameter is all identical is realized Coherent Detection as reference optical fiber, omitted the frequency displacement governing loop of light, light path and filtering have been simplified, reduced frequency stabilization requirement to light source, but employing is unpractical with the optical fiber of the identical parameter of sensor fibre as reference optical fiber in long-range Brillouin's time-domain reflectomer, lacks practicality, and only is used for intermediate range 10km sensor-based system.
Summary of the invention
The objective of the invention is to propose the distribution type fiber-optic Brillouin sensing device of the fusion optical fiber Brillouin frequency shifter of a kind of simple, low price, measuring accuracy height, good stability.
The distribution type fiber-optic Brillouin sensing device of fusion optical fiber Brillouin frequency shifter of the present invention, comprise narrow-line width single frequency optical fiber laser, first optical fiber splitter, pulse-modulator, the optical fiber Brillouin frequency shifter, first fiber optical circulator, Erbium-Doped Fiber Amplifier, the polarization mode scrambler, second fiber optical circulator, optical fiber narrowband reflection wave filter, second optical fiber splitter, the fiber Raman pump laser, the single mode sensor fibre, optical fiber filter, the 3rd optical fiber splitter, photoelectricity receives, amplifier module, first digital signal processor, the photoelectricity heterodyne reception, amplifier module, second digital signal processor and computing machine, wherein the optical fiber Brillouin frequency shifter is by circulator, and single-mode fiber and fiber F-P wave filter are connected to form successively.The input end of first optical fiber splitter links to each other with narrow-line width single frequency optical fiber laser, output terminal of first optical fiber splitter links to each other with the circulator input end in the optical fiber Brillouin frequency shifter, another output terminal of first optical fiber splitter links to each other with the input end of pulse-modulator, the output terminal of pulse-modulator links to each other through the input end of fiber amplifier with the polarization mode scrambler, the output terminal of polarization mode scrambler links to each other with the input end of second fiber optical circulator, the input end of an output terminated optical fiber narrowband reflection wave filter of second fiber optical circulator, the input end of another output termination optical fiber filter of second fiber optical circulator, the output terminal of optical fiber narrowband reflection wave filter links to each other with the input end of second optical fiber splitter, an output termination fiber Raman pump laser of second optical fiber splitter, another output terminal of second optical fiber splitter is connected with the single mode sensor fibre, fiber Raman pump laser and single mode sensor fibre constitute forward direction pumping optical fiber raman amplifier, the output terminal of optical fiber filter links to each other with the input end of the 3rd optical fiber splitter, output terminal of the 3rd optical fiber splitter and photoelectricity receive, the input end of amplifier module links to each other, photoelectricity receives, the output terminal of amplifier module links to each other with the input end of first digital signal processor, the output termination computing machine of first digital signal processor, input end of another output terminal of the 3rd optical fiber splitter and first fiber optical circulator links to each other, another input end of first fiber optical circulator links to each other with circulator output terminal in the optical fiber Brillouin frequency shifter, the output terminal of first fiber optical circulator and photoelectricity heterodyne reception, the input end of amplifier module links to each other, the photoelectricity heterodyne reception, the output terminal of amplifier module links to each other with the input end of second digital signal processor, the output termination computing machine of second digital signal processor.
Among the present invention, said narrow-line width single frequency optical fiber laser is that Zhong Xin Bo Long is 1550nm, and spectral line width is 3kHz, side mode suppression ratio＞65dB, and output power reaches the adjustable continuous operation fiber laser of 0-20mW.
Among the present invention, the single-mode fiber in the optical fiber Brillouin frequency shifter can be 2km, 3km or 5km single-mode fiber.Fiber F-P wave filter in the optical fiber Brillouin frequency shifter is a narrowband reflection F-P wave filter, only reflects the Stokes brillouin scattering signal in the single-mode fiber.
Among the present invention, said fiber Raman pump laser is that centre wavelength is the 1465nm fibre optic Raman laser of operation continuously, and spectral width is 0.1nm, and power 100mw-1200mw scope is adjustable.It and single mode sensor fibre are formed the forward direction pumping optical fiber raman amplifier of a C-band Gain Adjustable, replace optical fiber Brillouin amplifier among the BOTDA to the brillouin scattering signal that transmits in the optical fiber amplification that is concerned with, strengthen signal, reduced fiber transmission attenuation.
Among the present invention, the splitting ratio of said first optical fiber splitter is 50: 50; The splitting ratio of second optical fiber splitter is 95: 5; The splitting ratio of the 3rd optical fiber splitter is 50: 50.
Among the present invention, G652 communication single-mode fiber that said single mode sensor fibre can be 60km or 80km or LEAF optical fiber.
Among the present invention, the centre wavelength of said optical fiber narrow band reflective filter is 1465nm, and spectral width is 0.3nm, to the isolation＞45dB of 1465nm Rayleigh scattering light.The optical fiber narrow band reflective filter suppresses the Rayleigh scattering dorsad that 1465nm fiber Raman pump laser produces in the single mode sensor fibre, avoid Rayleigh scattering light to disturb the influence of the anti-Stokes Raman scattering of 1450nm wave band in the sensor fibre.
Among the present invention, said photoelectricity reception, amplifier module and photoelectricity heterodyne reception, amplifier module are respectively the modules that InGaAs photoelectricity avalanche diode and amplifier are formed.Because local signal v
0-v
BWith echoed signal v
0-v
B 'The frequency of difference frequency is in hundred megahertz frequency ranges, and common InGaAs photoelectricity avalanche diode frequency response can be satisfied the detection requirement.
Among the present invention, pulse-modulator makes the narrow-line width single frequency optical fiber laser of continuous operation, producing repetition frequency by modulator is 1kHz, pulsewidth is the pulse laser of 50ns, as the exploring laser light source of optical fiber Brillouin Time Domain Analyzer and link polarization mode scrambler PS, be used for reducing the polarization degree of correlation through Erbium-Doped Fiber Amplifier (EDFA).
The principle of work of optical fiber Brillouin frequency shifter:
The laser that narrow-line width single frequency optical fiber laser sends enters the single-mode fiber in the optical fiber Brillouin frequency shifter, and laser and optical fiber interact, and produces Rayleigh scattering, Brillouin scattering and Raman scattering.In optical fiber, the nonlinear interaction of sound wave in the exploring laser light of incident optical and the optical fiber, light wave produces sound wave by electrostriction, causes the periodic modulation (refractive-index grating) of optical fibre refractivity, produce the Brillouin scattering photon, be called optical fiber Brillouin (Brillouin) scattering effect.The optical fiber Brillouin scattering is incident photon v
0With the inelastic collision of optical fiber interaction of molecules, participation be acoustical phonon, the frequency of phonon is 11GHz, front end v
0+ Δ v is the anti-Stokes Brillouin scattering, low frequency end v
0-Δ v is the Stokes Brillouin scattering.The threshold value of Stokes Brillouin scattering is far below the anti-Stokes Brillouin scattering, and when incident laser reached certain threshold value, the incident light overwhelming majority was converted into Stokes Brillouin scattering v dorsad
0-Δ v has realized the frequency displacement of incident light, with the exploring laser light frequency displacement Δ v, constitute the optical fiber Brillouin frequency shifter.
Optical fiber stimulated Raman amplifies principle of work:
As incident laser v
0Produce the nonlinear interaction scattering with the optical fiber molecule, emit a phonon and be called the Stokes Raman scattering photon, absorb a phonon and be called anti-Stokes Raman scattering photon Δ v, the phonon frequency of optical fiber molecule is 13.2THz.
v＝v
0±Δv (1)
The turn off gain of amplifier is
G
A＝exp(g
RP
0L
eff/A
eff)(2)
P wherein
0=I
0A
EffBe the pump light power input of amplifier, g
RBe Raman gain coefficienct A
EffBe the free area of optical fiber, L
EffBe the effective interaction length (having considered the absorption loss of optical fiber to pumping) of optical fiber, its expression formula is as follows:
For fiber Raman amplifier, pump power has only when surpassing a certain threshold value, just might produce excited Raman to signal and amplify the stokes wave v=v in optical fiber
0-Δ v increases in fiber medium fast, the power of most of pump light can convert stokes light to, and Raman amplification arranged, the relevant Brillouin scattering that in optical fiber, transmits dorsad that amplified of this stimulated Raman scattering phenomenon, gain can suppress the loss of Brillouin scattering in optical fiber, improves the operating distance of fully distributed fiber Brillouin sensing device.
The principle of work of Brillouin's Time Domain Analyzer:
In optical fiber, the nonlinear interaction of sound wave in the exploring laser light of incident optical and the optical fiber, light wave produces sound wave by electrostriction, cause the periodic modulation (refractive-index grating) of optical fibre refractivity, produce upper and lower anti-Stokes that moves of frequency and Stokes Brillouin scattering, the frequency displacement v of the Brillouin scattering dorsad that in optical fiber, produces
BFor:
v
B＝2nv/λ (1)
Wherein n is the refractive index at lambda1-wavelength λ place, and v is the velocity of sound in the optical fiber, when λ=1550nm, and v
BBe about 11GHz.Produce anti-Stokes and Stokes Brillouin scattering dorsad in the optical fiber.
v＝v
0±v
B (2)
Brillouin scattering optical frequency shift v in optical fiber
BHave strain and temperature effect,
The frequency displacement of Brillouin scattering
δv
B＝C
vεδε+C
vTδT (4)
The coefficient of strain C of frequency displacement wherein
V εWith temperature coefficient C
VTFor
C
vε＝0.-0482±0.004MHz/με，C
vT＝1.10±0.02MHz/K
The intensity of Brillouin scattering also has strain and temperature effect in the optical fiber, and the strength ratio of Brillouin scattering also depends on the strain and the temperature of optical fiber in the optical fiber
The coefficient of strain C of strength ratio wherein
P εWith temperature coefficient C
PTFor
C
Pε＝-(7.7±1.4)×10
-4％/με，C
PT＝0.36±0.06％/K
By (3) formula and (4) formula, as long as measure strain 6 ε and the temperature difference 6T that each section frequency displacement and strength ratio on the optical fiber can demodulate this section optical fiber.
During work, the continuous laser of arrowband single frequency optical fiber laser output is divided into two bundles through first optical fiber splitter, and wherein beam of laser produces v through the fiber F-P wave filter in the optical fiber Brillouin frequency shifter
0-v
BOptical fiber Stokes Brillouin scattering, as the local signal of BOTDR and BOTDA, v in the formula
BFor the optical fiber Brillouin frequency displacement, be about 11GHz.Another bundle pulse modulated device of first optical fiber splitter is modulated into pulsed light, amplify through Erbium-Doped Fiber Amplifier again, by the polarization mode scrambler, enter the single mode sensor fibre, with single mode sensor fibre generation nonlinear interaction, produce Brillouin scattering dorsad, the frequency of Brillouin scattering and intensity are modulated by the temperature and the strain of each section of single mode sensor fibre.By second optical fiber splitter, the light laser pumping input single mode sensor fibre that the fiber Raman pump laser produces constitutes forward direction pumping optical fiber raman amplifier, produces Raman and amplify in the single mode sensor fibre, obtain the relevant Brillouin scattering that amplifies, the Brillouin scattering v that is concerned with and amplifies
0-v
B 'Through optical fiber narrowband reflection wave filter filtering 1465nm fiber Raman pump laser in the single mode sensor fibre laser pump (ing) back to remaining light, by first fiber optical circulator, will be from the echoed signal of Brillouin dorsad of the single mode sensor fibre that has temperature and strain information of the 3rd optical fiber splitter and local signal v from the optical fiber Brillouin frequency shifter
0-v
BMixing, the output after the mixing are sent into computer-controlled second digital signal processor through photoelectricity heterodyne reception, amplifier module, obtain upward strain and the warm frequency shift amount that causes that becomes of each section on the optical fiber; Another road of the 3rd optical fiber splitter Brillouin's echoed signal dorsad receives through photoelectricity, amplifier module carries out sending into computer-controlled first digital signal processor after the light-to-current inversion, the strength ratio of the Stokes brillouin scattering signal that obtains, machine strain as calculated again, obtain the strain and the temperature amount of each section in optical fiber behind the bilingual software demodulation of temperature change, strain and temperature changing speed and direction, utilize optical time domain reflection that the position of each section on the single mode sensor fibre is positioned (optical fibre radar location), through overstrain and Temperature Scaling, obtain the stress and the temperature variation of each section of single mode sensor fibre, surveying the strain precision is 20 μ ε, temperature measurement accuracy ± 1 ℃, Measuring Time 60s is shown or is passed through communication interface by graphoscope, communications protocol is carried out the telecommunication network transmission.
Advantage of the present invention:
The fully distributed fiber Brillouin sensing device of the fusion optical fiber Brillouin frequency shifter that the present invention proposes, adopt the probe source of narrow-line width single frequency optical fiber laser as Brillouin light time domain analyzer, adopt the optical fiber Brillouin frequency shifter to replace reference optical fiber the relevant heterodyne detection of microwave region ten gigahertz (GHZ) sesame frequency ranges is moved to the detection of tens megahertz frequency ranges, realized that tens megahertz frequency range heterodyne Coherent Detection replace ten gigahertz (GHZ) sesame frequency range heterodyne Coherent Detection, reduced the technical difficulty of heterodyne Coherent Detection, reduced cost significantly, the signal to noise ratio (S/N ratio) and the stability of system have been improved, fiber Raman pump laser and single mode sensor fibre are formed the forward direction pumping optical fiber raman amplifier of a C-band Gain Adjustable, replace optical fiber Brillouin amplifier among the BOTDA to the brillouin scattering signal that transmits in the optical fiber amplification that is concerned with, strengthened signal, reduced fiber transmission attenuation, improve the signal to noise ratio (S/N ratio) of system, improved the precision of strain and temperature simultaneously measuring.
Description of drawings
Fig. 1 is the synoptic diagram of the distribution type fiber-optic Brillouin sensing device of fusion optical fiber Brillouin frequency shifter of the present invention.
Embodiment
With reference to Fig. 1, the distribution type fiber-optic Brillouin sensing device of fusion optical fiber Brillouin frequency shifter of the present invention comprises narrow-line width single frequency optical fiber laser 10, first optical fiber splitter 11, pulse-modulator 12, optical fiber Brillouin frequency shifter 13, the first fiber optical circulators 14, Erbium-Doped Fiber Amplifier 15, polarization mode scrambler 16, second fiber optical circulator 17, optical fiber narrowband reflection wave filter 18, the second optical fiber splitters 19, fiber Raman pump laser 20, single mode sensor fibre 21, optical fiber filter 22, the three optical fiber splitters 23, photoelectricity receives, amplifier module 24, first digital signal processor 25, the photoelectricity heterodyne reception, amplifier module 26, the second digital signal processors 27 and computing machine 28, wherein optical fiber Brillouin frequency shifter 13 is by circulator 13-1, and single-mode fiber 13-2 and fiber F-P wave filter 13-3 are connected to form successively.The input end of first optical fiber splitter 11 links to each other with narrow-line width single frequency optical fiber laser 10, output terminal of first optical fiber splitter 11 links to each other with the circulator 13-1 input end in the optical fiber Brillouin frequency shifter 13, another output terminal of first optical fiber splitter 11 links to each other with the input end of pulse-modulator 12, the output terminal of pulse-modulator 12 links to each other through the input end of fiber amplifier 15 with polarization mode scrambler 16, the output terminal of polarization mode scrambler 16 links to each other with the input end of second fiber optical circulator 17, the input end of an output terminated optical fiber narrowband reflection wave filter 18 of second fiber optical circulator 17, the input end of another output termination optical fiber filter 22 of second fiber optical circulator 17, the output terminal of optical fiber narrowband reflection wave filter 18 links to each other with the input end of second optical fiber splitter 19, an output termination fiber Raman pump laser 20 of second optical fiber splitter 19, another output terminal of second optical fiber splitter 19 is connected with single mode sensor fibre 21, fiber Raman pump laser 20 constitutes forward direction pumping optical fiber raman amplifier with single mode sensor fibre 21, the output terminal of optical fiber filter 22 links to each other with the input end of the 3rd optical fiber splitter 23, output terminal of the 3rd optical fiber splitter 23 and photoelectricity receive, the input end of amplifier module 24 links to each other, photoelectricity receives, the output terminal of amplifier module 24 links to each other with the input end of first digital signal processor 25, the output termination computing machine 28 of first digital signal processor 25,14 1 input ends of another output terminal of the 3rd optical fiber splitter 23 and first fiber optical circulator link to each other, another input end of first fiber optical circulator 14 links to each other with circulator 13-1 output terminal in the optical fiber Brillouin frequency shifter 13, the output terminal of first fiber optical circulator 14 and photoelectricity heterodyne reception, the input end of amplifier module 26 links to each other, the photoelectricity heterodyne reception, the output terminal of amplifier module 26 links to each other with the input end of second digital signal processor 27, the output termination computing machine 28 of second digital signal processor 27.
The short cavity narrow linewidth 1550nmNFFL type narrow-line width single frequency optical fiber laser that narrow-line width single frequency optical fiber laser adopts the highly doped special optical fiber of Shenzhen femtometre laser technology company limited to make.
Narrow-line width single frequency optical fiber laser 10 produces v after by the single-mode fiber in the optical fiber Brillouin frequency shifter 13
0Laser and v
0-v
BOptical fiber is the Stokes Brillouin scattering dorsad, filters v through the fiber F-P wave filter
0Laser, the v that obtains
0-v
BOptical fiber Stokes Brillouin scattering, as the local signal of BOTDR and BOTDA, v in the formula
BFor the optical fiber Brillouin frequency displacement, be about 11GHz.Adopt the optical fiber Brillouin frequency shifter to replace reference optical fiber the relevant heterodyne detection of microwave region ten gigahertz (GHZ) sesame frequency ranges is moved to the detection of tens megahertz frequency ranges.
Photoelectricity reception, amplifier module and photoelectricity heterodyne reception, amplifier module all adopt the HZOE-GDJM-2 type photoelectricity receiver module of Hangzhou OE Technology Co., Ltd..
First digital signal processor adopts the 100MHz bandwidth of Hangzhou OE Technology Co., Ltd., the HZOE-SP01 type signal processing card of 250MS/s acquisition rate; Second digital signal processor 27 adopts the 100MHz bandwidth of Hangzhou OE Technology Co., Ltd., and the HZOE-SP02 type of 250MS/s acquisition rate has the signal processing card of FFT transducer.
Claims (7)
1. merge the distribution type fiber-optic Brillouin sensing device of optical fiber Brillouin frequency shifter, it is characterized in that comprising narrow-line width single frequency optical fiber laser (10), first optical fiber splitter (11), pulse-modulator (12), optical fiber Brillouin frequency shifter (13), first fiber optical circulator (14), Erbium-Doped Fiber Amplifier (15), polarization mode scrambler (16), second fiber optical circulator (17), optical fiber narrowband reflection wave filter (18), second optical fiber splitter (19), fiber Raman pump laser (20), single mode sensor fibre (21), optical fiber filter (22), the 3rd optical fiber splitter (23), photoelectricity receives, amplifier module (24), first digital signal processor (25), the photoelectricity heterodyne reception, amplifier module (26), second digital signal processor (27) and computing machine (28), wherein optical fiber Brillouin frequency shifter (13) is by circulator (13-1), and single-mode fiber (13-2) and fiber F-P wave filter (13-3) are connected to form successively.The input end of first optical fiber splitter (11) links to each other with narrow-line width single frequency optical fiber laser (10), output terminal of first optical fiber splitter (11) links to each other with circulator (13-1) input end in the optical fiber Brillouin frequency shifter (13), another output terminal of first optical fiber splitter (11) links to each other with the input end of pulse-modulator (12), the output terminal of pulse-modulator (12) links to each other through the input end of fiber amplifier (15) with polarization mode scrambler (16), the output terminal of polarization mode scrambler (16) links to each other with the input end of second fiber optical circulator (17), the input end of an output terminated optical fiber narrowband reflection wave filter (18) of second fiber optical circulator (17), the input end of another output termination optical fiber filter (22) of second fiber optical circulator (17), the output terminal of optical fiber narrowband reflection wave filter (18) links to each other with the input end of second optical fiber splitter (19), an output termination fiber Raman pump laser (20) of second optical fiber splitter (19), another output terminal of second optical fiber splitter (19) is connected with single mode sensor fibre (21), fiber Raman pump laser (20) constitutes forward direction pumping optical fiber raman amplifier with single mode sensor fibre (21), the output terminal of optical fiber filter (22) links to each other with the input end of the 3rd optical fiber splitter (23), output terminal of the 3rd optical fiber splitter (23) and photoelectricity receive, the input end of amplifier module (24) links to each other, photoelectricity receives, the output terminal of amplifier module (24) links to each other with the input end of first digital signal processor (25), the output termination computing machine (28) of first digital signal processor (25), (14) input ends of another output terminal of the 3rd optical fiber splitter (23) and first fiber optical circulator link to each other, another input end of first fiber optical circulator (14) links to each other with circulator (13-1) output terminal in the optical fiber Brillouin frequency shifter (13), the output terminal of first fiber optical circulator (14) and photoelectricity heterodyne reception, the input end of amplifier module (26) links to each other, the photoelectricity heterodyne reception, the output terminal of amplifier module (26) links to each other with the input end of second digital signal processor (27), the output termination computing machine (28) of second digital signal processor (27).
2. the distribution type fiber-optic Brillouin sensing device of fusion optical fiber Brillouin frequency shifter according to claim 1, it is characterized in that said narrow-line width single frequency optical fiber laser (10) is that Zhong Xin Bo Long is 1550nm, spectral line width is 3kHz, side mode suppression ratio＞65dB, output power is the adjustable continuous operation fiber laser of 0-20mW.
3. the distribution type fiber-optic Brillouin sensing device of fusion optical fiber Brillouin frequency shifter according to claim 1 is characterized in that the single-mode fiber (13-2) in the optical fiber Brillouin frequency shifter (13) is 2km, 3km or 5km single-mode fiber; Fiber F-P wave filter (13-3) in the optical fiber Brillouin frequency shifter (13) is a narrowband reflection F-P wave filter.
4. the distribution type fiber-optic Brillouin sensing device of fusion optical fiber Brillouin frequency shifter according to claim 1, it is characterized in that fiber Raman pump laser (20) is that centre wavelength is the 1465nm fibre optic Raman laser of operation continuously, spectral width is 0.1nm, and power 100mw-1200mw scope is adjustable.
5. the distribution type fiber-optic Brillouin sensing device of fusion optical fiber Brillouin frequency shifter according to claim 1, the splitting ratio that it is characterized in that said first optical fiber splitter (11) is 50: 50; The splitting ratio of second optical fiber splitter (19) is 95: 5; The splitting ratio of the 3rd optical fiber splitter (23) is 50: 50.
6. the distribution type fiber-optic Brillouin sensing device of fusion optical fiber Brillouin frequency shifter according to claim 1 is characterized in that G652 communication single-mode fiber or the LEAF optical fiber of said single mode sensor fibre (21) for 60km or 80km.
7. the distribution type fiber-optic Brillouin sensing device of fusion optical fiber Brillouin frequency shifter according to claim 1, the centre wavelength that it is characterized in that optical fiber narrowband reflection wave filter (18) is 1465nm, spectral width is 0.3nm, to the isolation＞45dB of 1465nm Rayleigh scattering light.
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| CN113063451A (en) * | 2019-12-16 | 2021-07-02 | 中兴通讯股份有限公司 | Receiving module and Brillouin optical time domain analyzer |
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