CN102853857B - Long-distance optical fiber Brillouin optical time-domain analyzer - Google Patents
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Abstract
The invention discloses a long-distance optical fiber Brillouin optical time-domain analyzer which comprises sensing optical fiber, main equipment mainly comprising a detection light source, a frequency measurement, a signal output module, a main equipment controller and a first remote communication module, and slave equipment comprising mainly comprising a pumping light source, a polarization scrambler, a slave equipment controller and a second remote communication module; the main equipment and the slave equipment are positioned at the two ends of the sensing optical fiber; frequency measurement of continuous light output by the detection light source and the pumping light source as well as receiving of backscattering signal of the sensing optical fiber can be realized through the frequency measurement and the signal output module of the main equipment; and the slave equipment is controlled through the communication and interaction of the first remote communication module and the second remote communication module. The long-distance optical fiber Brillouin optical time-domain analyzer has the advantages that under the premise of not sacrificing spatial resolution, measuring accuracy and measuring time, the measuring distance can be effectively increased by one time, the maximal measuring distance can reach more than 120 kilometers, and the application range of the optical fiber Brillouin optical time-domain analyzer is effectively enlarged.
Description
Technical field
The present invention relates to a kind of distributed fiberoptic sensor, especially relate to a kind of long-distance optical fiber Brillouin light time domain analyzer.
Background technology
Distributed fiberoptic sensor has a wide range of applications in the security monitoring in the fields such as power equipment, civil engineering work, water conservancy projects and communications optical cable.Distributed fiberoptic sensor based on Brillouin scattering has that measuring distance is long, measuring accuracy is high, and can realize the advantage such as temperature and stress measurement, therefore enjoys people to pay close attention to.Optical fiber Brillouin sensing technology mainly comprises following two classes: Brillouin light Time Domain Reflectometry (BOTDR, Brillouin Opitcal Time Domain Reflectometry) technology and Brillouin optical time domain analysis (BOTDA, Brillouin Opitcal Time Domain Analysis) technology.Wherein, Brillouin light time domain reflection technology is single-ended measurement, and it detects faint spontaneous brillouin scattering light, is therefore difficult to realize long range measurements; Brillouin optical time domain analysis technology is then double-end measurement, the stimulated Brillouin scattering light that its detection is stronger, and therefore measuring distance and measuring accuracy are all better than Brillouin light time domain reflection technology, are the optical fiber sensing technologies of current most application prospect.
Brillouin light time domain analyzer utilizes the interaction of pump light and detection light to realize distributed temperature, strain sensing.For realizing control and the frequency sweeping of pump light and detection light, pump light source and probe source are all arranged at the side of sensor fibre by existing Brillouin light time domain analyzer, and sensor fibre adopts U-shaped round configuration (loop structure).Like this, pump light and detection light all need to experience the fiber lengths doubling distance sensing and could realize measuring, specifically, if realize the distance sensing of 50km, then pump light and detection light need experience the fiber lengths of 100km, and this not only wastes energy and the Measuring Time of pump light and detection light, more crucially limit by fiber nonlinear effect, along with the increase of fiber lengths, the input optical power of pump light is restricted, thus have impact on the measuring accuracy of sensor.
For long-distance optical fiber Brillouin light time domain analyzer, also correlative study is had to report at present, utilize the Brillouin light time domain analyzer of pulse coding technique can improve measurement length and spatial resolution as the people such as Canadian X. Bao describe in SPIE meeting paper, 50km measuring distance can be realized, high-acruracy survey (the X.Bao of 1m spatial resolution, H.Liang, Y.Dong, W.Li, Y.Li, and L.Chen, " Pushing the limit of the distributed Brillouin sensors for the sensing length and the spatial resolution ", Proceedings of SPIE, vol. 7677, pp. 767702-767702-13, 2010).In addition, the people such as Hispanic Marcelo A. Soto utilize similar techniques to achieve Brillouin light time domain analyzer (the Marcelo A. Soto of loop (the namely conventional U-shaped round configuration of sensor fibre) 120km, Gabriele Bolognini, and Fabrizio Di Pasquale, " Long-range simplex-coded BOTDA sensor over 120km distance employing optical preamplification ", Optics Letters, vol. 36, Issue 2, pp. 232-234, 2011), its maximum measuring distance will be no more than 60km, it is the mxm. of report at present.
Power overhead network, long-distance oil & gas pipeline belong to great infrastructure, and its operation security involves the interests of the state and the people, and need novel on-line monitoring technique badly.No matter be power overhead network or long-distance oil & gas pipeline, its node is very long, and typical monitoring distance is 80km, have even more than 120km, but the Brillouin light time domain analyzer of the U-shaped round configuration of the sensor fibre of routine cannot meet this monitoring requirements.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of long-distance optical fiber Brillouin light time domain analyzer, and it effectively can increase the distance sensing of system, and does not sacrifice spatial resolution and measuring accuracy.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of long-distance optical fiber Brillouin light time domain analyzer, it is characterized in that comprising sensor fibre, primarily of probe source, frequency measurement and signal output module, main equipment controller, first remote communication module composition main equipment and primarily of pump light source, scrambler, from device controller, second remote communication module composition from equipment, the output terminal of described probe source is connected with the input end of described frequency measurement and signal output module, described frequency measurement and the output terminal of signal output module are connected with one end of described sensor fibre, described main equipment controller respectively with described probe source, described frequency measurement and signal output module, the first described remote communication module is connected, the output terminal of described pump light source is connected with the input end of described scrambler, the output terminal of described scrambler is connected with the other end of described sensor fibre, described from device controller respectively with described pump light source, described scrambler, the second described remote communication module is connected, the first described remote communication module and the second described remote communication module communication interaction, described frequency measurement and signal output module are used for carrying out frequency measurement to the continuous light that described probe source and described pump light source export and the backscatter signals continuous light that described probe source exports being modulated into the sensor fibre described in pulsed light and reception.
The first described remote communication module is independently wireless communication module or for being embedded at the wireless communication module in described main equipment controller, the second described remote communication module is independently wireless communication module or described from the wireless communication module device controller for being embedded at, described main equipment and described wirelessly telecommunication is mutual by the first described remote communication module and the second described remote communication module from equipment.
Further, the first described remote communication module and the second described remote communication module are optical fiber telecommunications module, described main equipment and described telecommunication is mutual in a wired fashion by the first described remote communication module and the second described remote communication module from equipment, the first described remote communication module comprises the first light wavelength division multiplexing and the first fiber optical transceiver, the second described remote communication module comprises the second light wavelength division multiplexing and the second fiber optical transceiver, the first described light wavelength division multiplexing and the second described light wavelength division multiplexing all have three input ends and an output terminal, the first described fiber optical transceiver and the second described fiber optical transceiver all have a control end and a Laser emission end and a signal receiving end, or all there is a control end and a Laser emission and Signal reception common terminal, an input end of the first described light wavelength division multiplexing is connected with the output terminal of described frequency measurement and signal output module, another two input ends of the first described light wavelength division multiplexing and the Laser emission end of the first described fiber optical transceiver and signal receiving end is corresponding connects, or be all connected with Signal reception common terminal with the Laser emission of the first described fiber optical transceiver, the output terminal of the first described light wavelength division multiplexing is connected with one end of described sensor fibre, the control end of the first described fiber optical transceiver is connected with described main equipment controller, an input end of the second described light wavelength division multiplexing is connected with the output terminal of described scrambler, another two input ends of the second described light wavelength division multiplexing and the Laser emission end of the second described fiber optical transceiver and signal receiving end is corresponding connects, or be all connected with Signal reception common terminal with the Laser emission of the second described fiber optical transceiver, the output terminal of the second described light wavelength division multiplexing is connected with the other end of described sensor fibre, the control end of the second described fiber optical transceiver is connected from device controller with described, at this, utilize the first light wavelength division multiplexing and the second light wavelength division multiplexing by optical fiber Brillouin sensing part and optical fiber communication fractional reuse on a sensor fibre, not only saved fiber resource, and improve fiber utilization.
As preferably, the Laser emission end of the first described fiber optical transceiver is not identical with the wavelength of the Laser emission end of the second described fiber optical transceiver; Now, realize the two-way interactive of two fiber optical transceivers (i.e. the first fiber optical transceiver and the second fiber optical transceiver) by the first light wavelength division multiplexing and the second light wavelength division multiplexing over the same fiber, save fiber resource.
Described frequency measurement and signal output module comprise the first fiber coupler, pulse-modulator, optical circulator, second fiber coupler, 3rd fiber coupler, frequency detector and photoelectric switching circuit, the first described fiber coupler has an input end and two output terminals, the second described fiber coupler and the 3rd described fiber coupler all have two input ends and an output terminal, described optical circulator has three ports, the input end of the first described fiber coupler is connected with the output terminal of described probe source, an output terminal of the first described fiber coupler is connected with the input end of described pulse-modulator, another output terminal of the first described fiber coupler is connected with an input end of the 3rd described fiber coupler, the output terminal of described pulse-modulator is connected with first port of described optical circulator, second port of described optical circulator is connected with an input end of the second described fiber coupler, 3rd port of described optical circulator is connected with the input end of described photoelectric switching circuit, another input end of the second described fiber coupler is connected with another input end of the 3rd described fiber coupler, the output terminal of the second described fiber coupler is connected with one end of described sensor fibre, the output terminal of the 3rd described fiber coupler is connected with the input end of described frequency detector, the output terminal of described frequency detector is connected with described main equipment controller respectively with the output terminal of described photoelectric switching circuit.
As preferably, image intensifer is provided with between the second described fiber coupler and the 3rd described fiber coupler, another input end of the second described fiber coupler is connected with the input end of described image intensifer, and the output terminal of described image intensifer is connected with another input end of the 3rd described fiber coupler; At this, because the continuous light sent from the pump light source in equipment is after long-distance optical fiber transmission, signal energy decay is comparatively large, therefore between the second fiber coupler and the 3rd fiber coupler, arranges an image intensifer, such signal, after image intensifer amplifies, is more conducive to frequency sonding.
As preferably, one in described probe source and described pump light source is the narrow linewidth laser of frequency-adjustable and another is the fixing narrow linewidth laser of frequency.
As preferably, long-distance optical fiber Brillouin light time domain analyzer of the present invention also comprises one and to walk abreast the telecommunication optical fiber arranged with described sensor fibre, the first described remote communication module and the second described remote communication module are optical fiber telecommunications module, described main equipment and described telecommunication is mutual in a wired fashion by the first described remote communication module and the second described remote communication module from equipment, the first described remote communication module comprises the first light wavelength division multiplexing and the first fiber optical transceiver, the second described remote communication module comprises the second light wavelength division multiplexing and the second fiber optical transceiver, the first described light wavelength division multiplexing and the second described light wavelength division multiplexing all have two input ends and an output terminal, the first described fiber optical transceiver and the second described fiber optical transceiver all have a control end and a Laser emission end and a signal receiving end, or all there is a control end and a Laser emission and Signal reception common terminal, two input ends of the first described light wavelength division multiplexing and the Laser emission end of the first described fiber optical transceiver and signal receiving end is corresponding connects, or be all connected with Signal reception common terminal with the Laser emission of the first described fiber optical transceiver, the output terminal of the first described light wavelength division multiplexing is connected with one end of described telecommunication optical fiber, the control end of the first described fiber optical transceiver is connected with described main equipment controller, two input ends of the second described light wavelength division multiplexing and the Laser emission end of the second described fiber optical transceiver and signal receiving end is corresponding connects, or be all connected with Signal reception common terminal with the Laser emission of the second described fiber optical transceiver, the output terminal of the second described light wavelength division multiplexing is connected with the other end of described telecommunication optical fiber, the control end of the second described fiber optical transceiver is connected from device controller with described, at this, because the two ends of sensor fibre are not connected with the first light wavelength division multiplexing and the second light wavelength division multiplexing, therefore, it is possible to effectively reduce optical fiber link loss, improve the backscatter signals of sensor fibre tail end, the measuring accuracy of system can be improved further.
As preferably, long-distance optical fiber Brillouin light time domain analyzer of the present invention, the 3rd input end is also provided with at the first described light wavelength division multiplexing and the second described light wavelength division multiplexing, the 4th fiber coupler is provided with between the other end of described scrambler and described sensor fibre, the 4th described fiber coupler has an input end and two output terminals, the output terminal of described scrambler is connected with the input end of the 4th described fiber coupler, an output terminal of the 4th described fiber coupler is connected with the other end of described sensor fibre, another output terminal of the 4th described fiber coupler is connected with the 3rd input end of the second described light wavelength division multiplexing, described frequency measurement and signal output module comprise the first fiber coupler, pulse-modulator, optical circulator, 3rd fiber coupler, frequency detector and photoelectric switching circuit, the first described fiber coupler has an input end and two output terminals, the 3rd described fiber coupler has two input ends and an output terminal, described optical circulator has three ports, the input end of the first described fiber coupler is connected with the output terminal of described probe source, an output terminal of the first described fiber coupler is connected with the input end of described pulse-modulator, another output terminal of the first described fiber coupler is connected with an input end of the 3rd described fiber coupler, the output terminal of described pulse-modulator is connected with first port of described optical circulator, second port of described optical circulator is connected with one end of described sensor fibre, 3rd port of described optical circulator is connected with the input end of described photoelectric switching circuit, another input end of the 3rd described fiber coupler is connected with the 3rd input end of the first described light wavelength division multiplexing, the output terminal of the 3rd described fiber coupler is connected with the input end of described frequency detector, the output terminal of described frequency detector is connected with described main equipment controller respectively with the output terminal of described photoelectric switching circuit, at this, the power of optical fiber Brillouin sensing means suitable pump light source can not be too large, frequency sonding part then requires that the power of pump light source is higher, therefore the continuous light sent from the pump light source equipment can be made after the 4th fiber coupler light splitting to enter telecommunication optical fiber, i.e. frequency measurement and optical fiber telecommunications fractional reuse optical fiber, optical fiber Brillouin sensing part takies separately an optical fiber, so both can improve the backscatter signals of sensor fibre tail end, thus improve the measuring accuracy of system, the accuracy of frequency measurement can be improved again.
As preferably, image intensifer is provided with between the 3rd described fiber coupler and the first described light wavelength division multiplexing, 3rd input end of the first described light wavelength division multiplexing is connected with the input end of described image intensifer, and the output terminal of described image intensifer is connected with another input end of the 3rd described fiber coupler.
Compared with prior art, the invention has the advantages that:
1) pump light source and probe source are placed in the two ends of long-distance sensing optical fiber by optical fiber Brillouin light time domain analyzer of the present invention, realize the frequency measurement of the continuous light that probe source and pump light source export by the frequency measurement of main equipment and signal output module and receive the backscatter signals of sensor fibre, and by the first remote communication module and the second remote communication module communication interaction realize from equipment control, do not sacrificing spatial resolution like this, under the prerequisite of measuring accuracy and Measuring Time, effectively can increase effective measuring distance (1 times can be increased), maximum measuring distance can reach more than 120 kilometers, thus effectively expand the scope of application of optical fiber Brillouin light time domain analyzer, power overhead network can be met well, the monitoring requirements of the great infrastructure such as long-distance oil & gas pipeline.
2) the optical fiber telecommunications module that optical fiber Brillouin light time domain analyzer utilization of the present invention contains light wavelength division multiplexing realizes optical fiber Brillouin sensing and optical fiber communication is multiplexing, and multiplexed form according to measuring distance and can apply operating mode flexible configuration, easy to operate.
3) optical fiber Brillouin light time domain analyzer structure of the present invention is simple, realizes cost low.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of long-distance optical fiber optical time-domain analysis device of the present invention;
Fig. 2 is the structural representation of the optical fiber Brillouin light time domain analyzer of the embodiment of the present invention one;
Fig. 3 is the structural representation of the optical fiber Brillouin light time domain analyzer of the embodiment of the present invention two;
Fig. 4 is the structural representation of frequency measurement in the optical fiber Brillouin light time domain analyzer of the embodiment of the present invention one and embodiment two and signal output module;
Fig. 5 is the structural representation of new frequency measurement and the signal output module formed after increasing image intensifer in Fig. 4;
Fig. 6 is the structural representation of the optical fiber Brillouin light time domain analyzer of the embodiment of the present invention three;
Fig. 7 is the structural representation of the optical fiber Brillouin light time domain analyzer of the embodiment of the present invention four.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one:
A kind of long-distance optical fiber Brillouin light time domain analyzer that the present embodiment proposes, as Fig. 1, Fig. 2, shown in Fig. 4 and Fig. 5, it comprises sensor fibre 3, primarily of probe source 102, frequency measurement and signal output module 103, main equipment controller 104, first remote communication module 101 form main equipment 1 and primarily of pump light source 202, scrambler 203, from device controller 204, second remote communication module 201 form from equipment 2, the output terminal of probe source 102 is connected with the input end of frequency measurement and signal output module 103, the output terminal of frequency measurement and signal output module 103 is connected with one end of sensor fibre 3, main equipment controller 104 respectively with probe source 102, frequency measurement and signal output module 103, first remote communication module 101 is connected, probe source 102, frequency measurement and signal output module 103, first remote communication module 101 is controlled by main equipment controller 104, the output terminal of pump light source 202 is connected with the input end of scrambler 203, the output terminal of scrambler 203 is connected with the other end of sensor fibre 3, from device controller 204 respectively with pump light source 202, scrambler 203, second remote communication module 201 is connected, pump light source 202, scrambler 203, second remote communication module 201 controls by from device controller 204, the first remote communication module 101 and the second remote communication module 201 communication interaction.At this, the continuous light that frequency measurement and signal output module 103 export for the continuous light that exports probe source 102 and pump light source 202 carries out frequency measurement and the continuous light that probe source 102 exports is modulated into pulsed light and receives the backscatter signals of sensor fibre 3.
In this particular embodiment, as shown in Figure 2, first remote communication module 101 and the second remote communication module 201 are optical fiber telecommunications module, main equipment 1 and (namely by sensor fibre 3) telecommunication is mutual in a wired fashion by the first remote communication module 101 and the second remote communication module 201 from equipment 2, first remote communication module 101 comprises the first light wavelength division multiplexing 1011 and the first fiber optical transceiver 1012, second remote communication module 201 comprises the second light wavelength division multiplexing 2011 and the second fiber optical transceiver 2012, first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011 all have three input ends and an output terminal, first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 all have a control end and a Laser emission end and a signal receiving end, an input end of the first light wavelength division multiplexing 1011 is connected with the output terminal of the second fiber coupler 1034 in frequency measurement and signal output module 103, another two input ends of the first light wavelength division multiplexing 1011 and the Laser emission end of the first fiber optical transceiver 1012 and signal receiving end connect one to one, the output terminal of the first light wavelength division multiplexing 1011 is connected with one end of sensor fibre 3, the control end of the first fiber optical transceiver 1012 is connected with main equipment controller 104, an input end of the second light wavelength division multiplexing 2011 is connected with the output terminal of scrambler 203, another two input ends of the second light wavelength division multiplexing 2011 and the Laser emission end of the second fiber optical transceiver 2012 and signal receiving end connect one to one, the output terminal of the second light wavelength division multiplexing 2011 is connected with the other end of sensor fibre 3, the control end of the second fiber optical transceiver 2012 is connected with from device controller 204.
At this, first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 all have employed the fiber optical transceiver with a control end, a Laser emission end and a signal receiving end, and the Laser emission end of the first fiber optical transceiver 1012 is not identical with the wavelength of the Laser emission end of the second fiber optical transceiver 2012, specifically, when the Laser emission end of the first fiber optical transceiver 1012 selects centre wavelength to be the semiconductor laser near 1310nm, then the Laser emission end of the second fiber optical transceiver 2012 can select centre wavelength to be semiconductor laser near 1490nm.
At this, first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 also all can adopt the fiber optical transceiver with a control end and a Laser emission and Signal reception common terminal, namely Laser emission end and signal receiving end are merged into a common terminal, now fiber optical transceiver inside is preset a wavelength-division multiplex diaphragm and (is reflected with 1310nm, 1490nm is by being example), during connection the first light wavelength division multiplexing 1011 another two input ends in an output terminal be connected with Signal reception common terminal with the Laser emission of the first fiber optical transceiver 1012, an output in another two input ends of the second light wavelength division multiplexing 2011 is connected with Signal reception common terminal with the Laser emission of the second fiber optical transceiver 2012, namely the laser (for 1310nm) that the Laser emission end of the first fiber optical transceiver 1012 sends reflexes to Laser emission and Signal reception common terminal through the wavelength-division multiplex diaphragm that the first fiber optical transceiver 1012 is built-in, and through the first light wavelength division multiplexing 1011, Laser emission and the Signal reception common terminal of the second fiber optical transceiver 2012 is entered after sensor fibre 3 and the second light wavelength division multiplexing 2011, then signal receiving end is reflexed to by the inner preset wavelength-division multiplex diaphragm of the second fiber optical transceiver 2012, in like manner, the laser (for 1490nm) that the Laser emission end of the second fiber optical transceiver 2012 sends is transmitted through Laser emission and Signal reception common terminal through the wavelength-division multiplex diaphragm that the second fiber optical transceiver 2012 is built-in, and after the second light wavelength division multiplexing 2011, sensor fibre 3 and the first light wavelength division multiplexing 1011, enter Laser emission and the Signal reception common terminal of the first fiber optical transceiver 1012, be then transmitted through signal receiving end by the inner preset wavelength-division multiplex diaphragm of the first fiber optical transceiver 1012.
At this, the first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 for sensor fibre 3 two ends equipment between communication interaction, can Real-time Obtaining modules information, and carry out corresponding control.
In this particular embodiment, frequency measurement and signal output module 103 are as shown in Figure 4, it comprises the first fiber coupler 1031, pulse-modulator 1032, optical circulator 1033, second fiber coupler 1034, 3rd fiber coupler 1035, frequency detector 1036 and photoelectric switching circuit 1037, first fiber coupler 1031 has an input end and two output terminals, second fiber coupler 1034 and the 3rd fiber coupler 1035 all have two input ends and an output terminal, optical circulator 1033 has three ports, the input end of the first fiber coupler 1031 is connected with the output terminal of probe source 102, an output terminal of the first fiber coupler 1031 is connected with the input end of pulse-modulator 1032, another output terminal of first fiber coupler 1031 is connected with an input end of the 3rd fiber coupler 1035, the output terminal of pulse-modulator 1032 is connected with first port of optical circulator 1033, second port of optical circulator 1033 is connected with an input end of the second fiber coupler 1034, 3rd port of optical circulator 1033 is connected with the input end of photoelectric switching circuit 1037, another input end of second fiber coupler 1034 is connected with another input end of the 3rd fiber coupler 1035, the output terminal of the second fiber coupler 1034 is connected with one end of sensor fibre 3 by the first light wavelength division multiplexing 1011 of the first remote communication module 101, namely an input end of the first light wavelength division multiplexing 1011 is connected with the output terminal of the second fiber coupler 1034, also namely the output terminal of the second fiber coupler 1034 is connected indirectly with one end of sensor fibre 3, the output terminal of the 3rd fiber coupler 1035 is connected with the input end of frequency detector 1036, the output terminal of frequency detector 1036 is connected with main equipment controller 104 respectively with the output terminal of photoelectric switching circuit 1037.
In this particular embodiment, in the frequency measurement shown in Fig. 4 and signal output module 103, also can be provided with image intensifer 1038 between the second fiber coupler 1034 and the 3rd fiber coupler 1035, as shown in Figure 5, another input end of second fiber coupler 1034 is connected with the input end of image intensifer 1038, and the output terminal of image intensifer 1038 is connected with another input end of the 3rd fiber coupler 1035; At this, the continuous light that the pump light source 202 because producing decay through long range propagation sends can be amplified after adding image intensifer 1038, thus the accuracy of frequency measurement can be increased.
In this particular embodiment, one in probe source 102 and pump light source 202 is the narrow linewidth laser of frequency-adjustable and another is the fixing narrow linewidth laser of frequency, if namely probe source 102 is the laser instrument of frequency-adjustable, then pump light source 202 is the fixing laser instrument of frequency, if pump light source 202 is the laser instrument of frequency-adjustable, then probe source 102 is the fixing laser instrument of frequency.At this, narrow linewidth laser can select narrow linewidth semiconductor laser, also can select narrow cable and wide optical fiber laser.In the present embodiment, probe source 102 selects low noise narrow linewidth semiconductor laser, and centre wavelength is 1550.12nm, and power is 10mW; Pump light source 202 selects low noise narrow linewidth semiconductor laser, and centre wavelength is 1550.20nm, and power is 10mW.
In the present embodiment, scrambler 203 adopts prior art; First light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011 are conventional fiber optic passive device, the optical maser wavelength of separable, multiplexing first fiber optical transceiver 1012, the optical maser wavelength of the second fiber optical transceiver 2012 and the optical maser wavelength of pump light source and probe source, they can select the optical fibre wavelength division multiplexer of fused tapered, also can select the optical fibre wavelength division multiplexer of filtering flap-type.1 × 3 optical fibre wavelength division multiplexer of the preferred filtering flap-type of the present embodiment, it can realize the separation of (1310 ± 20) nm, (1490 ± 20) nm and (1550 ± 0.5) nm wave band of laser and multiplexing; First fiber coupler 1031 and the second fiber coupler 1034 all adopt splitting ratio to be the coupling mechanism of 10:90, and the 3rd fiber coupler adopts splitting ratio to be the coupling mechanism of 50:50, are ripe existing device; Pulse-modulator 1032, optical circulator 1033, frequency detector 1036 and photoelectric switching circuit 1037, image intensifer 1038 all adopt prior art.
In the present embodiment, main equipment controller 104 and all adopt existing controller from device controller 204, the control circuit based on high-performance 16 bit digital controller (dsPIC33F) that can adopt Wei Xin company of the U.S. in specific implementation process.Main equipment controller 104 is mainly used in the output wavelength and the Output optical power that control probe source 102, control the duty of the first fiber optical transceiver 1012, and go out the brillouin frequency spectrum information of optical fiber each point according to the signal receiving of frequency measurement and signal output module 103, and then obtain optical fiber distributed temperature, strain information.Wherein control probe source 102 output wavelength part and can utilize existing PID(proportional-integral-differential) controller, can according to the wavelength of frequency detector 1036 output level value adjustment probe source 102; Control probe source 102 Output optical power usable criterion laser control circuit, by regulating light source drive current adjustment Output optical power.Be mainly used in from device controller 204 duty controlling pump light source 202, control scrambler 203, control the duty of the second fiber optical transceiver 2012.Wherein control pump light source 202 can utilize existing can the control circuit of accurate adjustment drive current and working temperature, control scrambler 203 and mainly optimize and disturb offset frequency rate for eliminating the polarization noise of backscatter signals and the polarization correlated of elimination frequency sonding.
The principle of work of the long-distance optical fiber Brillouin light time domain analyzer of the present embodiment is: main equipment controller 104 sends the laser of the 1310nm by certain rule encoding by the Laser emission end that the control end of the first fiber optical transceiver 1012 controls the first fiber optical transceiver 1012, laser enters sensor fibre 3 after the first optical fiber communication multiplexer 1011 is multiplexing, then after the second optical fiber communication multiplexer 2011 demultiplexing, enter the signal receiving end of the second fiber optical transceiver 2012, Received signal strength enters from device controller 204 by the control end of the second fiber optical transceiver 2012, the command parameter of autonomous device controller 104 generation is resolved from device controller 204.Similar, sent the laser of the 1490nm by certain rule encoding by the Laser emission end of the second fiber optical transceiver 2012 from device controller 204, laser enters sensor fibre 3 after the second optical fiber communication multiplexer 2011 is multiplexing, then after the first optical fiber communication multiplexer 1011 demultiplexing, enter the signal receiving end of the first fiber optical transceiver 1012, main equipment controller 104 resolves the status information since device controller 104 occurs.So, the first remote communication module 101 and the second remote communication module 201 realize communication interaction.Main equipment 1 controls the original state from the pump light source 202 equipment 2 and scrambler 203.The continuous laser pulse modulated device 1032 that probe source 102 sends forms pulse laser after modulating, and pulse laser enters sensor fibre 3 after optical circulator 1033 and the first light wavelength division multiplexing 1011; The continuous laser that pump light source 202 sends and the signal that the second fiber optical transceiver 2012 sends transmit through sensor fibre 3 through the second light wavelength division multiplexing 2011 wavelength-division multiplex, recycle the first light wavelength division multiplexing 1011 afterwards and separate wavelength-division multiplex.Wherein the continuous pump light that sends of pump light source 202 after image intensifer 1038 amplifies or directly and the detection light that sends of probe source 102 at the 3rd fiber coupler 1035 beat frequency, detect after beat frequency rate through frequency detector 1036 and adjust probe source frequency by main equipment controller 104, to realize the scanning of sensor fibre Brillouin frequency spectrum.Pump light and enter photoelectric switching circuit 1037 through optical fiber circulator 1033 from the backscatter signals light of sensor fibre 3, and then entering main equipment controller 104, main equipment controller 104 obtains sensor fibre 3 Brillouin shift everywhere and temperature, stress information by analytical calculation.
The present embodiment utilizes wavelength-division multiplex technique that optical fiber Brillouin sensing part and optical communication part are multiplexed into same sensor fibre, utilize the frequency measurement containing Optical Amplifier Unit and signal output module 103 survey frequency simultaneously, under the prerequisite of not sacrificing Brillouin sensing segment space resolution, measuring accuracy and Measuring Time, the measuring distance of optical fiber Brillouin light time domain analyzer is added 1 times, not only save fiber resource, improve fiber utilization, and structure is simple, cost is low.
Embodiment two:
A kind of long-distance optical fiber Brillouin light time domain analyzer that the present embodiment proposes, as shown in Fig. 1, Fig. 3, Fig. 4 and Fig. 5, the difference of the optical fiber Brillouin light time domain analyzer of the present embodiment and the optical fiber Brillouin light time domain analyzer of embodiment one is: add a telecommunication optical fiber 4; The output terminal of frequency measurement and signal output module 103 is not be connected with one end of sensor fibre 3 by the first remote communication module 101, but is directly connected with one end of sensor fibre 3, and the first remote communication module 101 is connected with telecommunication optical fiber 4; Similar, the output terminal of scrambler 203 is not be connected with the other end of sensor fibre 3 by the second remote communication module 201, but is directly connected with the other end of sensor fibre 3, and the second remote communication module 201 is connected with telecommunication optical fiber 4.
The long-distance optical fiber Brillouin light time domain analyzer of the present embodiment as shown in Figure 3, it also comprises the telecommunication optical fiber 4 that arranges parallel with sensor fibre 3, main equipment 1 and (namely by telecommunication optical fiber 4) telecommunication is mutual in a wired fashion by the first remote communication module 101 and the second remote communication module 201 from equipment 2, first remote communication module 101 comprises the first light wavelength division multiplexing 1011 and the first fiber optical transceiver 1012, second remote communication module 201 comprises the second light wavelength division multiplexing 2011 and the second fiber optical transceiver 2012, first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011 all have two input ends and an output terminal, first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 all have a control end and a Laser emission end and a signal receiving end, two input ends of the first light wavelength division multiplexing 1011 and the Laser emission end of the first fiber optical transceiver 1012 and signal receiving end connect one to one, the output terminal of the first light wavelength division multiplexing 1011 is connected with one end of telecommunication optical fiber 4, the control end of the first fiber optical transceiver 1012 is connected with main equipment controller 104, two input ends of the second light wavelength division multiplexing 2011 and the Laser emission end of the second fiber optical transceiver 2012 and signal receiving end connect one to one, the output terminal of the second light wavelength division multiplexing 2011 is connected with the other end of telecommunication optical fiber 4, the control end of the second fiber optical transceiver 2012 is connected with from device controller 204.At this, first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 all have employed the fiber optical transceiver with a control end, a Laser emission end and a signal receiving end, and the Laser emission end of the first fiber optical transceiver 1012 is not identical with the wavelength of the Laser emission end of the second fiber optical transceiver 2012; First fiber optical transceiver 1012 and the second fiber optical transceiver 2012 also all can adopt the fiber optical transceiver with a control end and a Laser emission and Signal reception common terminal, namely Laser emission end and signal receiving end are merged into a common terminal, during connection, another two input ends of the first light wavelength division multiplexing 1011 are all connected with Signal reception common terminal with the Laser emission of the first fiber optical transceiver 1012, and another two input ends of the second light wavelength division multiplexing 2011 are connected with Signal reception common terminal with the Laser emission of the second fiber optical transceiver 2012.
In the present embodiment, the optical maser wavelength of the first light wavelength division multiplexing 1011 and separable, multiplexing first fiber optical transceiver 1012 of the second light wavelength division multiplexing 2011 and the optical maser wavelength of the second fiber optical transceiver 2012, they can select the optical fibre wavelength division multiplexer of fused tapered, also can select the optical fibre wavelength division multiplexer of filtering flap-type.The present embodiment preferred molten draws 1 × 2 tapered optical fibre wavelength division multiplexer, and it can realize being separated with multiplexing of (1310 ± 20) nm and (1490 ± 20) nm wave band of laser.Other device and the embodiment one of the present embodiment are similar.
Principle of work and the embodiment one of the long-distance optical fiber Brillouin light time domain analyzer of the present embodiment are similar.In the present embodiment, first remote communication module 101 and the second remote communication module 201 directly realize main equipment 101 by independent telecommunication optical fiber 4 and from the communication interaction between equipment 201, because the two ends of sensor fibre 3 are not connected with the first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011, because this reducing optical fiber link loss, improve the backscatter signals of sensor fibre 3 tail end, thus further increase the measuring accuracy of optical fiber Brillouin light time domain analyzer.
Embodiment three:
A kind of long-distance optical fiber Brillouin light time domain analyzer that the present embodiment proposes, as shown in figures 1 to 6, the optical fiber Brillouin light time domain analyzer of the present embodiment is with the difference of the optical fiber Brillouin light time domain analyzer of embodiment two: the present embodiment medium frequency measure and the structure (as shown in Figure 6) of signal output module not identical with the structure (as shown in Figure 4 and Figure 5) of the frequency measurement that embodiment two provides and signal output module with embodiment one, not identical with the connected mode of other module or other optical device yet; And from equipment 2, adding the 4th fiber coupler 205, on the first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011, be also provided with the 3rd input end simultaneously.
The long-distance optical fiber Brillouin light time domain analyzer of the present embodiment as shown in Figure 6, it is also provided with the 3rd input end on the first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011, the 4th fiber coupler 205 is being provided with from the scrambler 203 in equipment 2 and between the other end of sensor fibre 3, 4th fiber coupler 205 has an input end and two output terminals, the output terminal of scrambler 203 is connected with the input end of the 4th fiber coupler 205, an output terminal of the 4th fiber coupler 205 is connected with the other end of sensor fibre 3, another output terminal of 4th fiber coupler 205 is connected with the 3rd input end of the second light wavelength division multiplexing 2011, frequency measurement and signal output module 103 comprise the first fiber coupler 1031, pulse-modulator 1032, optical circulator 1033, 3rd fiber coupler 1035, frequency detector 1036 and photoelectric switching circuit 1037, first fiber coupler 1031 has an input end and two output terminals, 3rd fiber coupler 1035 has two input ends and an output terminal, optical circulator 1033 has three ports, the input end of the first fiber coupler 1031 is connected with the output terminal of probe source 102, an output terminal of the first fiber coupler 1031 is connected with the input end of pulse-modulator 1032, another output terminal of first fiber coupler 1031 is connected with an input end of the 3rd fiber coupler 1035, the output terminal of pulse-modulator 1032 is connected with first port of optical circulator 1033, second port of optical circulator 1033 is connected with one end of sensor fibre 3, 3rd port of optical circulator 1033 is connected with the input end of photoelectric switching circuit 1037, another input end of 3rd fiber coupler 1035 is connected with the 3rd input end of the first light wavelength division multiplexing 1011, the output terminal of the 3rd fiber coupler 1035 is connected with the input end of frequency detector 1036, the output terminal of frequency detector 1036 is connected with main equipment controller 104 respectively with the output terminal of photoelectric switching circuit 1037.
In the present embodiment, probe source 102 selects low noise narrow linewidth semiconductor laser, and centre wavelength is 1550.12nm, and power is 10mW; Pump light source 202 selects low noise narrow cable and wide optical fiber laser, and centre wavelength is 1550.20nm, and power is for being greater than 100mW; 4th fiber coupler 205 adopts splitting ratio to be the fiber coupler of 1:99, wherein the pump light of 1% enters sensor fibre 3, the pump light of 99% enters telecommunication optical fiber 4, now, through the decay of 100km telecommunication optical fiber 4, the power entering the pump light of another input end of the 3rd fiber coupler 1035 still has about 1mW, thus ensure that the measurement accuracy of frequency detector 1036.Other device of the present embodiment and embodiment one and embodiment two similar.
The principle of work of the long-distance optical fiber Brillouin light time domain analyzer of the present embodiment and embodiment one, embodiment two are similar.Because the power of optical fiber Brillouin sensing means suitable pump light source can not be too large; Frequency sonding part then requires that the power of pump light source is higher, therefore the continuous light sent from the pump light source 202 equipment 2 can be made after the 4th fiber coupler 205 light splitting to enter telecommunication optical fiber 4, i.e. frequency measurement and optical fiber telecommunications fractional reuse optical fiber, optical fiber Brillouin sensing part takies separately an optical fiber, so both can improve the backscatter signals of sensor fibre 3 tail end, thus improve the measuring accuracy of optical fiber Brillouin light time domain analyzer, the accuracy of frequency measurement can be improved again.
Embodiment four:
A kind of long-distance optical fiber Brillouin light time domain analyzer that the present embodiment proposes, as shown in Figure 1 and Figure 7, the difference of the optical fiber Brillouin light time domain analyzer of the present embodiment and the optical fiber Brillouin light time domain analyzer of embodiment three is: between the 3rd input end and another input end of the 3rd fiber coupler 1035 of the first light wavelength division multiplexing 1011, add an image intensifer 1038, and probe source 102 and pump light source 202 all select low noise narrow linewidth semiconductor laser, the splitting ratio of the 4th fiber coupler 205 is 10:90.
In the present embodiment, 3rd input end of the first light wavelength division multiplexing 1011 is connected with the input end of image intensifer 1038, the output terminal of image intensifer 1038 is connected with another input end of the 3rd fiber coupler 1035, and image intensifer 1038 selects EDFA amplifier or the SOA amplifier of the upper common employing of communication; Probe source 102 selects low noise narrow linewidth semiconductor laser, and centre wavelength is 1550.12nm, and power is 10mW; Pump light source 202 selects low noise narrow linewidth semiconductor laser, and centre wavelength is 1550.20nm, and power is 10mW.Other device of the present embodiment and connected mode and embodiment three similar.Owing to adding image intensifer 1038 at another input end of the 3rd fiber coupler 1035, therefore lower to the demanded power output of pump light source 202, the narrow linewidth semiconductor laser that modulating performance is better can be selected like this.
Embodiment five:
A kind of long-distance optical fiber Brillouin light time domain analyzer that the present embodiment proposes, as shown in Figure 1, Figure 4 and Figure 5.The difference of the optical fiber Brillouin light time domain analyzer of the present embodiment and the optical fiber Brillouin light time domain analyzer of above-mentioned four embodiments is: the first remote communication module 101 and the second remote communication module 201 adopt communication to carry out communication interaction, and the first remote communication module 101 can be independently wireless communication module, also can for being embedded at the wireless communication module in main equipment controller 104, second remote communication module 201 can be independently wireless communication module, also can for being embedded at from the wireless communication module device controller 204.
In the present embodiment, the first remote communication module 101 and the second remote communication module 201 all optional technical grade GPRS wireless communication module.
In the present embodiment, first remote communication module 101 and the second remote communication module 201 directly adopt wireless communication module, the structure of optical fiber Brillouin light time domain analyzer of the present invention can be made more succinct, and without the need to taking fiber resource, being adapted at cordless communication network and covering monitoring in good region.
The foregoing is only preferred embodiment of the present invention, should not be construed as limiting the scope of the invention.Within the spirit and principles in the present invention all, any type of distortion done, equivalent replacement, improvement etc. all should be included within protection scope of the present invention.
Claims (10)
1. a long-distance optical fiber Brillouin light time domain analyzer, it is characterized in that comprising sensor fibre, primarily of probe source, frequency measurement and signal output module, main equipment controller, first remote communication module composition main equipment and primarily of pump light source, scrambler, from device controller, second remote communication module composition from equipment, the output terminal of described probe source is connected with the input end of described frequency measurement and signal output module, described frequency measurement and the output terminal of signal output module are connected with one end of described sensor fibre, described main equipment controller respectively with described probe source, described frequency measurement and signal output module, the first described remote communication module is connected, the output terminal of described pump light source is connected with the input end of described scrambler, the output terminal of described scrambler is connected with the other end of described sensor fibre, described from device controller respectively with described pump light source, described scrambler, the second described remote communication module is connected, the first described remote communication module and the second described remote communication module communication interaction, described frequency measurement and signal output module are used for carrying out frequency measurement to the continuous light that described probe source and described pump light source export and the backscatter signals continuous light that described probe source exports being modulated into the sensor fibre described in pulsed light and reception.
2. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 1, it is characterized in that the first described remote communication module is independently wireless communication module or for being embedded at the wireless communication module in described main equipment controller, the second described remote communication module is independently wireless communication module or described from the wireless communication module device controller for being embedded at, described main equipment and described wirelessly telecommunication is mutual by the first described remote communication module and the second described remote communication module from equipment.
3. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 1, it is characterized in that the first described remote communication module and the second described remote communication module are optical fiber telecommunications module, described main equipment and described telecommunication is mutual in a wired fashion by the first described remote communication module and the second described remote communication module from equipment, the first described remote communication module comprises the first light wavelength division multiplexing and the first fiber optical transceiver, the second described remote communication module comprises the second light wavelength division multiplexing and the second fiber optical transceiver, the first described light wavelength division multiplexing and the second described light wavelength division multiplexing all have three input ends and an output terminal, the first described fiber optical transceiver and the second described fiber optical transceiver all have a control end and a Laser emission end and a signal receiving end, or all there is a control end and a Laser emission and Signal reception common terminal, an input end of the first described light wavelength division multiplexing is connected with the output terminal of described frequency measurement and signal output module, another two input ends of the first described light wavelength division multiplexing and the Laser emission end of the first described fiber optical transceiver and signal receiving end is corresponding connects, or be all connected with Signal reception common terminal with the Laser emission of the first described fiber optical transceiver, the output terminal of the first described light wavelength division multiplexing is connected with one end of described sensor fibre, the control end of the first described fiber optical transceiver is connected with described main equipment controller, an input end of the second described light wavelength division multiplexing is connected with the output terminal of described scrambler, another two input ends of the second described light wavelength division multiplexing and the Laser emission end of the second described fiber optical transceiver and signal receiving end is corresponding connects, or be all connected with Signal reception common terminal with the Laser emission of the second described fiber optical transceiver, the output terminal of the second described light wavelength division multiplexing is connected with the other end of described sensor fibre, the control end of the second described fiber optical transceiver is connected from device controller with described.
4. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 1, characterized by further comprising one to walk abreast the telecommunication optical fiber arranged with described sensor fibre, the first described remote communication module and the second described remote communication module are optical fiber telecommunications module, described main equipment and described telecommunication is mutual in a wired fashion by the first described remote communication module and the second described remote communication module from equipment, the first described remote communication module comprises the first light wavelength division multiplexing and the first fiber optical transceiver, the second described remote communication module comprises the second light wavelength division multiplexing and the second fiber optical transceiver, the first described light wavelength division multiplexing and the second described light wavelength division multiplexing all have two input ends and an output terminal, the first described fiber optical transceiver and the second described fiber optical transceiver all have a control end and a Laser emission end and a signal receiving end, or all there is a control end and a Laser emission and Signal reception common terminal, two input ends of the first described light wavelength division multiplexing and the Laser emission end of the first described fiber optical transceiver and signal receiving end is corresponding connects, or be all connected with Signal reception common terminal with the Laser emission of the first described fiber optical transceiver, the output terminal of the first described light wavelength division multiplexing is connected with one end of described telecommunication optical fiber, the control end of the first described fiber optical transceiver is connected with described main equipment controller, two input ends of the second described light wavelength division multiplexing and the Laser emission end of the second described fiber optical transceiver and signal receiving end is corresponding connects, or be all connected with Signal reception common terminal with the Laser emission of the second described fiber optical transceiver, the output terminal of the second described light wavelength division multiplexing is connected with the other end of described telecommunication optical fiber, the control end of the second described fiber optical transceiver is connected from device controller with described.
5. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 3 or 4, is characterized in that the Laser emission end of the first described fiber optical transceiver is not identical with the wavelength of the Laser emission end of the second described fiber optical transceiver.
6. a kind of long-distance optical fiber Brillouin light time domain analyzer according to any one of claim 1 to 4, it is characterized in that described frequency measurement and signal output module comprise the first fiber coupler, pulse-modulator, optical circulator, second fiber coupler, 3rd fiber coupler, frequency detector and photoelectric switching circuit, the first described fiber coupler has an input end and two output terminals, the second described fiber coupler and the 3rd described fiber coupler all have two input ends and an output terminal, described optical circulator has three ports, the input end of the first described fiber coupler is connected with the output terminal of described probe source, an output terminal of the first described fiber coupler is connected with the input end of described pulse-modulator, another output terminal of the first described fiber coupler is connected with an input end of the 3rd described fiber coupler, the output terminal of described pulse-modulator is connected with first port of described optical circulator, second port of described optical circulator is connected with an input end of the second described fiber coupler, 3rd port of described optical circulator is connected with the input end of described photoelectric switching circuit, another input end of the second described fiber coupler is connected with another input end of the 3rd described fiber coupler, the output terminal of the second described fiber coupler is directly or indirectly connected with one end of described sensor fibre, the output terminal of the 3rd described fiber coupler is connected with the input end of described frequency detector, the output terminal of described frequency detector is connected with described main equipment controller respectively with the output terminal of described photoelectric switching circuit.
7. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 6, it is characterized in that being provided with image intensifer between the second described fiber coupler and the 3rd described fiber coupler, another input end of the second described fiber coupler is connected with the input end of described image intensifer, and the output terminal of described image intensifer is connected with another input end of the 3rd described fiber coupler.
8. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 4, it is characterized in that the first described light wavelength division multiplexing and the second described light wavelength division multiplexing are also provided with the 3rd input end, the 4th fiber coupler is provided with between the other end of described scrambler and described sensor fibre, the 4th described fiber coupler has an input end and two output terminals, the output terminal of described scrambler is connected with the input end of the 4th described fiber coupler, an output terminal of the 4th described fiber coupler is connected with the other end of described sensor fibre, another output terminal of the 4th described fiber coupler is connected with the 3rd input end of the second described light wavelength division multiplexing, described frequency measurement and signal output module comprise the first fiber coupler, pulse-modulator, optical circulator, 3rd fiber coupler, frequency detector and photoelectric switching circuit, the first described fiber coupler has an input end and two output terminals, the 3rd described fiber coupler has two input ends and an output terminal, described optical circulator has three ports, the input end of the first described fiber coupler is connected with the output terminal of described probe source, an output terminal of the first described fiber coupler is connected with the input end of described pulse-modulator, another output terminal of the first described fiber coupler is connected with an input end of the 3rd described fiber coupler, the output terminal of described pulse-modulator is connected with first port of described optical circulator, second port of described optical circulator is connected with one end of described sensor fibre, 3rd port of described optical circulator is connected with the input end of described photoelectric switching circuit, another input end of the 3rd described fiber coupler is connected with the 3rd input end of the first described light wavelength division multiplexing, the output terminal of the 3rd described fiber coupler is connected with the input end of described frequency detector, the output terminal of described frequency detector is connected with described main equipment controller respectively with the output terminal of described photoelectric switching circuit.
9. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 8, it is characterized in that being provided with image intensifer between the 3rd described fiber coupler and the first described light wavelength division multiplexing, 3rd input end of the first described light wavelength division multiplexing is connected with the input end of described image intensifer, and the output terminal of described image intensifer is connected with another input end of the 3rd described fiber coupler.
10. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 1, one that it is characterized in that in described probe source and described pump light source is the narrow linewidth laser of frequency-adjustable and another is the fixing narrow linewidth laser of frequency.
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| CN107613265A (en) * | 2017-10-17 | 2018-01-19 | 吉林大学 | A kind of audio and video remote online monitoring system of anti-electromagnetic-radiation interference |
| CN107576342A (en) * | 2017-10-25 | 2018-01-12 | 国网河南省电力公司洛阳供电公司 | A kind of extra long distance Brillouin optical time domain analysis instrument |
| CN112880713B (en) * | 2021-01-18 | 2023-10-20 | 广东电网有限责任公司 | Optical path protection device of Brillouin optical time domain analyzer |
| CN115334380A (en) * | 2022-10-14 | 2022-11-11 | 南京邮电大学 | Intelligent analyzer, system and intelligent analysis method for on-line large-scale fiber-searching route |
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