CN208171424U - Multiple light courcess phase sensitive optical time domain reflectometer - Google Patents
Multiple light courcess phase sensitive optical time domain reflectometer Download PDFInfo
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- CN208171424U CN208171424U CN201820605279.XU CN201820605279U CN208171424U CN 208171424 U CN208171424 U CN 208171424U CN 201820605279 U CN201820605279 U CN 201820605279U CN 208171424 U CN208171424 U CN 208171424U
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Abstract
The utility model discloses a kind of multiple light courcess phase sensitive optical time domain reflectometers,It includes multiple lasers,Multiple first couplers,Multiple second couplers,And multiple photodetectors,The wavelength for the continuous light that various lasers issue is different,The continuous light that laser issues is shunted to the second coupler and wavelength-division multiplex modulation module through the first coupler,Wavelength-division multiplex modulation module by the continuous light of multichannel be modulated into pulsed light and multiplex at export all the way to fiber amplifier amplify after output to three port circulators,The backward Rayleigh scattering light of multichannel different wave length is matched to be input to respectively and be interfered with continuous the second coupler of light of same wavelength by the second wavelength division multiplexer,Multipath interference optical signal is converted to the perception information that electric signal is delivered to data collector and controls analysis module acquisition optical fiber by photodetector,The utility model uses the laser of multiple and different wavelength,Multiple photodetectors,Enhance the anti-polarization decay characteristic of system.
Description
Technical field
The utility model relates to distributed optical fiber vibration sensor technical fields, are in more detail related to a kind of multiple light courcess phase
The sensitive optical time domain reflectometer in position.
Background technique
Backward Rayleigh scattering light that optical time domain reflectometer (OTDR) is generated when being propagated in a fiber using pulsed light obtains
Dampening information is optical cable construction, the essential tool of monitoring.But since traditional optical time domain reflectometer is using Low coherence
The wideband light source of property, can only detect the variation of intensity information in Rayleigh scattering light, therefore can only realize that fiber lengths, optical fiber decline
Subtract, fiber failure positioning etc. functions.H.F.Taylor et al. proposed phase sensitive optical time domain reflection technology (φ-in 1993
OTDR), which replaces the wideband light source in traditional optical time domain reflectometer using the high-coherence light source of super-narrow line width, not only can be with
The intensity information variation in Rayleigh scattering light is detected, and optical phase information variation can be detected, since light phase is believed
Breath variation is related with exterior part ambient vibration, to realize fiber-optic vibration signal measurement.Since the technology not only has monitoring simultaneously
It is accurately positioned the function of various vibration events, and there is remote, highly sensitive, the anti-electromagnetism of whole distributed measurement, monitoring distance
The advantages that interference performance is strong, lightweight is small causes extensive concern and research, has been applied to long range optical cable guarantor at present
The fields such as shield, the tamper-proof excavation of oil-gas pipeline, circumference security protection, prevention of geological disaster.
Phase sensitive optical time domain reflectometer is the interference signal by Rayleigh scattering light backward in direct impulse width regions
And the amplitude at dynamic position, phase, the various characteristic informations of frequency are obtained, interference signal has phase sensitive optical time domain reflectometer
The ability of standby phase measurement, but the problem of also bring interference fading simultaneously, that is to say, that spatially the amplitude of certain positions by
Become smaller in the reason of the interference, or even relatively stable close to zero, and on the time, interference fading problem has seriously affected these positions
The detectivity and rate of false alarm set.
In order to solve the problems, such as interference fading, 2013, Zhou Jun, Pan Zhenqing et al. were in document《Based on the comprehensive mirror of multi-frequency
The Phase Demodulation Method of Optic of interference fading glitch in other φ-OTDR system》One is proposed in (Vol.40, No.9, Chinese laser)
Method of the kind based on the comprehensive judgement of multi-frequency, efficiently differentiates and eliminates wrong report, eliminates the mistake of system caused by interference fading
Report problem.The program produces multiple optical frequency signals using phase-modulator, realizes multichannel by measuring different beat signals
Signal measurement, but multiple beat signals reduce the output power of light source, and the measurement of multiple and different frequency beat signals
It is extremely complex.
Frequency response range is also the key technical indexes of phase sensitive light time domain reflectometer system, the vibration in actual environment
Dynamic signal can usually arrive material fracture in kHz even order of megahertz, such as pipeline leakage, civil structure, it is desirable that vibration
Sensor have measurement wideband vibration signal ability, however the measurement frequency of conventional phase sensitivity light time domain reflectometer system by
It is limited to measure distance, because the light-triggered time interval of direct impulse cannot be less than the two-way time of light in a fiber, such as 10km
Optical fiber, signal probably need 100us back and forth, i.e. single measurement needs 100us, in the limiting case can only to the sample rate of single-point
The vibration signal of 5KHz can only be responded according to Sampling Theorem to 10KHz, and with the increase of accumulative frequency, the change of distance
Long, response frequency exponentially reduces.
Patent in the prior art《Distributed optical fiber vibration sensor》(application number 201210349310.5) discloses one kind
Distributed optical fiber vibration sensor introduces MZ interferometer in phase sensitive light time domain reflectometer system, improves the sound of system
Answer frequency.But cause system sufficiently complex, it is unfavorable for functionization.
Document《Ultra-broadband phase-sensitive optical time-domain
reflectometry with a temporally sequenced multi-frequency source》(Vol.40,
15 2015/Optics Letters of No.22/November) using a kind of technology of time domain sequence multifrequency source, it can sweep
N number of fiber phase information is obtained in the repetition period retouched, to substantially increase the responsive bandwidth of system.The program uses electric light
Modulator EOM carries out shift frequency to light source, generates the optical signal of different frequency one by one.But control of this mode to EOM shift frequency
It is required that it is very high, and two frequency-shift signalings up and down would generally be generated after EOM shift frequency, normal measurement is adversely affected.
Patent in the prior art《Phase sensitive type optical time domain reflection sensing system and method》(application number
The phase sensitive type optical time domain reflection sensing system and method for a kind of double light source packages 201210060043.X) are disclosed, but should
Double light sources are merely used to provide different pulse optical powers in scheme can not achieve for the measurement of different length optical fiber
The promotion of detectivity and response frequency.
In conclusion this field needs one kind new phase sensitive optical time domain reflectometer and its method to solve above-mentioned ask
Topic.
Utility model content
One of the utility model is designed to provide a kind of multiple light courcess phase sensitive optical time domain reflectometer, overcomes interference
Decline is adversely affected caused by detection, enhances the anti-polarization decay characteristic of system, solves phase sensitive optical time domain reflection
In meter the problem of polarization decay.
Another of the utility model is designed to provide a kind of multiple light courcess phase sensitive optical time domain reflectometer, passes through control
The triggering moment of optical signal modulator and increase improve phase sensitive optical time domain reflection to the pendulous frequency of spatially identical point
The frequency response range of meter solves the problems, such as that phase sensitive optical time domain reflectometer frequency response is not high.
Therefore, to achieve the goals above, the utility model provides a kind of multiple light courcess phase sensitive optical time domain reflectometer,
Including：
At least two issue the laser of the continuous light of different wave length, one of them is sending λ1The laser of the continuous light of wavelength
Device, another is sending λ2The laser of the continuous light of wavelength, λ1Not equal to λ2；
At least two first couplers, each first coupler are corresponded with each laser respectively, institute
It states continuous light of first coupler for issuing the laser and is divided into two-way；
At least two second couplers, wavelength-division multiplex modulation module, wherein each second coupler respectively with it is each
First coupler corresponds, and it is multiple to be input to the wavelength-division all the way by the continuous light that first coupler is divided into two-way
With modulation module, another way is input to second coupler, and the wavelength-division multiplex modulation module is set to be come what is received
Pulsed light is modulated into from the continuous light of at least two-way of first coupler and multiplex at exporting all the way；
Fiber amplifier, the fiber amplifier receive at least two-way difference wave from the wavelength-division multiplex modulation module
Long pulsed light simultaneously amplifies output；
Three port circulators, three port circulator has first port, second port and third port, from institute
The pulsed light for stating at least two-way different wave length of fiber amplifier output inputs three port circulator from the first port,
Then it is output in test optical fiber by the second port, at least the pulsed light of two-way different wave length transmits in test optical fiber
When at least two back scattering occur respectively, wherein backward Rayleigh scattering is identical as input optical wavelength, therefore at least two-way is different
The corresponding backward Rayleigh scattering light for generating at least two-way different wave length of the pulsed light of wavelength, at least two-way different wave length is backward auspicious
Benefit scattering light is exported by the second port back to three port circulator and from the third port；
Second wavelength division multiplexer, second wavelength division multiplexer receive at least two-way exported from three port circulator
The backward Rayleigh scattering light of different wave length simultaneously separates the backward Rayleigh scattering light of at least two-way different wave length, respectively from least two
A port output, the backward Rayleigh scattering light of at least two-way different wave length is matched to be input to respectively to be connected with same wavelength
Second coupler of continuous light, therefore the light of two input ports input of each second coupler is by same
What laser generated, i.e. the wavelength of two-beam is identical, meets coherent condition and interferes；
At least two photodetectors, data collector and control analysis module, wherein each photodetector
It is corresponded with each second coupler, the interference light signal after second coupler interferes is input into institute
Photodetector is stated, interference light signal is converted into interference electric signal and is input to the data collector by the photodetector,
Interference signal is input to the control analysis module, the control to after electric signal progress high-speed sampling by the data collector
The interference signal that analysis module processing analysis receives, to know the perception information of optical fiber.
Preferably, the λ1For 1550.12nm, the λ2For 1550.92nm.
Preferably, first coupler is 1*2 coupler, and second coupler is 2*2 coupler.
A preferred embodiment according to the present utility model, the wavelength-division multiplex modulation module include one first wavelength-division multiplex
Device and an optical signal modulator, before first wavelength division multiplexer is arranged on the optical signal modulator, first wavelength-division
Multiplexer by the photosynthetic wave of at least two-way exported from first coupler at being input in the optical signal modulator afterwards all the way,
By the continuous light of at least two-way different wave length, be modulated into pulsed light is input to the fiber amplifier to the optical signal modulator simultaneously
In device.
Preferably, the optical signal modulator is acousto-optic modulator.
Another preferred embodiment according to the present utility model, the wavelength-division multiplex modulation module are multiple including one first wavelength-division
With device, at least two optical signal modulators, first wavelength division multiplexer is arranged at least two optical signal modulators
Rear side, each optical signal modulator and each first coupler correspond, and each first coupler separates
Light all the way be input to the corresponding optical signal modulator respectively, each optical signal modulator will come from described first
At first wavelength division multiplexer is input to after pulsed light, first wavelength division multiplexer is near few for the continuous light modulation of coupler
Two-way pulsed light multiplex at being input in the fiber amplifier afterwards all the way.
Another preferred embodiment according to the present utility model, each optical signal modulator divide with the control respectively
Module communication connection is analysed, the triggering moment of the different optical signal modulator of control is set not in the control analysis module
Together, the triggering moment of each optical signal modulator is controlled the optical signal modulation triggered relative to upper one
The triggering moment of device is sequentially delayed backward, and delay time is less than trigger pulse cycle T.
Preferably, in the case where two optical signal modulators, the delay time is the half for triggering cycle T.
The above-mentioned and other purpose of the utility model, feature, advantage will in the following detailed description, attached drawing and
The attached claims further clarify.
Detailed description of the invention
Fig. 1 is the configuration of the multiple light courcess phase sensitive optical time domain reflectometer of a preferred embodiment according to the present utility model
Schematic diagram；
Fig. 2 is matching for the multiple light courcess phase sensitive optical time domain reflectometer of another preferred embodiment according to the present utility model
Set schematic diagram；
In figure：Laser 10；Issue λ1The laser 11 of the continuous light of wavelength；Issue λ2The laser 12 of the continuous light of wavelength；The
One coupler 20；Wavelength-division multiplex modulation module 30；First wavelength division multiplexer 31；Optical signal modulator 32；Fiber amplifier 40；Three
Port circulator 50；First port 51；Second port 52；Third port 53；Second wavelength division multiplexer 60；Second coupler 70；
Photodetector 80；Data collector 90；Control analysis module 100；Laser 10A；Issue λ1The laser of the continuous light of wavelength
11A；Issue λ2The laser 12A of the continuous light of wavelength；First coupler 20A；Wavelength-division multiplex modulation module 30A；First wavelength-division is multiple
With device 31A；Optical signal modulator 32A；Fiber amplifier 40A；Three port circulator 50A；First port 51A；Second port
52A；Third port 53A；Second wavelength division multiplexer 60A；Second coupler 70A；Photodetector 80A；Data collector 90A；
Control analysis module 100A.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to utility model, it should be noted that
Under the premise of not colliding, new reality can be formed between various embodiments described below or between each technical characteristic in any combination
Apply example.
It is described below for disclosing the utility model so that those skilled in the art can be realized the utility model.It retouches below
Preferred embodiment in stating is only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.It is retouched following
The basic principle of the utility model defined in stating can be applied to other embodiments, deformation scheme, improvement project, etc. Tongfangs
The other technologies scheme of case and the spirit and scope without departing from the utility model.
It will be understood by those skilled in the art that in the exposure of the utility model, term " longitudinal direction ", " transverse direction ", "upper",
The orientation or position of the instructions such as "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside"
Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present invention and simplifying the description, and
It is not that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore
Above-mentioned term should not be understood as limiting the present invention.
It is understood that term " one " is interpreted as " at least one " or " one or more ", i.e., in one embodiment,
The quantity of one element can be one, and in a further embodiment, the quantity of the element can be it is multiple, term " one " is no
It can be interpreted as the limitation to quantity.
Referring to Fig. 1 of attached drawing, the multiple light courcess phase sensitive optical time domain of a preferred embodiment according to the present utility model is anti-
Penetrating meter will be elucidated in following description, wherein the multiple light courcess phase sensitive optical time domain reflectometer includes：
At least two issue the laser 10 of the continuous light of different wave length, one of them is sending λ1The continuous light of wavelength swashs
Light device 11, another is sending λ2The laser 12, λ of the continuous light of wavelength1Not equal to λ2；
At least two first couplers 20, each first coupler 20 are a pair of with each laser 10 1 respectively
It answers, first coupler 20 is used to the continuous light that the laser 10 issues being divided into two-way；
At least two second couplers 70, wavelength-division multiplex modulation module 30, wherein each second coupler 70 is distinguished
It corresponds with each first coupler 20, is input to all the way by the continuous light that first coupler 20 is divided into two-way
The wavelength-division multiplex modulation module 30, another way are input to second coupler 70, and the wavelength-division multiplex modulation module 30 wraps
One first wavelength division multiplexer 31 and an optical signal modulator 32 are included, first wavelength division multiplexer 31 is arranged on the optical signal
Before modulator 32, first wavelength division multiplexer 31 is by the photosynthetic wave of at least two-way exported from first coupler 20 at all the way
After be input in the optical signal modulator 32, the optical signal modulator 32 by the continuous light of at least two-way different wave length simultaneously
It is modulated into pulse light output；
Fiber amplifier 40, the fiber amplifier 40 receive at least two-way from the wavelength-division multiplex modulation module 30
The pulsed light of different wave length simultaneously amplifies output；
Three port circulators 50, three port circulator 50 have first port 51, second port 52 and third end
Mouth 53, the pulsed light of at least two-way different wave length exported from the fiber amplifier 40 input described from the first port 51
Then three port circulators 50 are output in test optical fiber, at least pulse of two-way different wave length by the second port 52
When transmitting in testing optical fiber at least two back scattering occur respectively for light, wherein backward Rayleigh scattering and input optical wavelength phase
Together, therefore the pulsed light of at least two-way different wave length corresponds to the backward Rayleigh scattering light for generating at least two-way different wave length, at least
The backward Rayleigh scattering light of two-way different wave length is by the second port 52 back to three port circulator 50 and from institute
State the output of third port 53；
Second wavelength division multiplexer 60, second wavelength division multiplexer 60 receive exported from three port circulator 50 to
The backward Rayleigh scattering light of few two-way different wave length simultaneously separates the backward Rayleigh scattering light of at least two-way different wave length, respectively from
The output of at least two ports, the backward Rayleigh scattering light of at least two-way different wave length is matched respectively to be input to same
Second coupler 70 of the continuous light of wavelength, therefore the light of two input ports input of each second coupler 70
It is to be generated by the same laser 10, i.e. the wavelength of two-beam is identical, meets coherent condition and interferes；
At least two photodetectors 80, data collector 90 and control analysis module 100, wherein each light
Electric explorer 80 and each second coupler 70 correspond, the interference light after second coupler 70 interferes
Signal is input into the photodetector 80, and interference light signal is converted into interference electric signal and inputted by the photodetector 80
To the data collector 90, the data collector 90 carries out after high-speed sampling for interference signal being input to described to electric signal
Control analysis module 100, the interference signal that the control analysis module 100 processing analysis receives, to know the sense of optical fiber
Know information.
Since 10 line width of laser is very narrow, the collected interference electric signal of the data collector 90 is not a routine
Damped exponential signals, but signal amplitude spatially has the interference deamplification of substantially fluctuation, when amplitude fading is to close
Detectivity can be seriously affected when zero.In multiple light courcess phase sensitive optical time domain reflectometer provided by the utility model, point
Not Cai Yongliao at least two issue different wave lengths continuous light laser 10, due to wavelength difference, so that it is dry to have obtained two-way
Deamplification, and due to the difference of wavelength, spatially the interference signal of same position all decay to zero probability it is very small, because
Anti- interference fading ability can be enhanced in this, guarantees the sensitivity of system.
It is noted that the laser 10, first coupler 20, second coupler 70, the photoelectricity
The quantity of detector 80 is unrestricted in the multiple light courcess phase sensitive optical time domain reflectometer of the utility model, for example,
With the laser 10, first coupler 20, second coupler 70, the photodetector 80 in the present embodiment
Quantity be for two come illustrate and disclose the utility model the multiple light courcess phase sensitive optical time domain reflectometer content
And feature, but the number of the laser 10, first coupler 20, second coupler 70, the photodetector 80
Amount is two contents and model that can not be considered as to the multiple light courcess phase sensitive optical time domain reflectometer of the utility model
The limitation enclosed.Optionally, under the premise of following two：The wavelength for the continuous light that the different lasers 10 issues is different；Institute
State the quantity number with the laser 10 respectively of the first coupler 20, second coupler 70, the photodetector 80
It measures corresponding.It is described in other possible examples of the multiple light courcess phase sensitive optical time domain reflectometer of the utility model
Laser 10, first coupler 20, second coupler 70, the photodetector 80 quantity can also with but it is unlimited
In being implemented as 3,4,5 etc..
It will be appreciated by persons skilled in the art that the laser 10, first coupler 20, second coupling
Device 70, the quantity of the photodetector 80 are more, spatially the interference signal of same position all decay to zero probability it is smaller.
Preferably, the wavelength X1For 1550.12nm, the wavelength X2For 1550.92nm.
Preferably, first coupler 20 is 1*2 coupler, and second coupler 70 is 2*2 coupler.
Preferably, the optical signal modulator 32 is acousto-optic modulator.
It will be readily appreciated by those skilled in the art that the optical signal modulator 32 is implemented as acousto-optic in the present embodiment
Modulator can not be considered as to the content of the multiple light courcess phase sensitive optical time domain reflectometer of the utility model and range
Limitation.Optionally, in other possible examples of the multiple light courcess phase sensitive optical time domain reflectometer of the utility model, institute
Stating optical signal modulator 32 also may be implemented as electrooptic modulator.
It will be appreciated by persons skilled in the art that the data collector 90 can be muti-piece capture card, or
With multiple data acquisition channels of independent triggers function in same capture card.
Referring to Fig. 2 of attached drawing, the multiple light courcess phase sensitive optical time domain of another preferred embodiment according to the present utility model
Reflectometer will be elucidated in following description, wherein the multiple light courcess phase sensitive optical time domain reflectometer includes：
At least two issue the laser 10A of the continuous light of different wave length, one of them is sending λ1The continuous light of wavelength
Laser 11A, another is sending λ2The laser 12A, λ of the continuous light of wavelength1Not equal to λ2；
At least two first coupler 20A, each first coupler 20A respectively with each laser 10A mono-
One is corresponding, and the first coupler 20A is used to the laser 10A continuous light issued being divided into two-way；
At least two second coupler 70A, wavelength-division multiplex modulation module 30A, wherein each second coupler 70A points
It is not corresponded with each first coupler 20A, the continuous light for being divided into two-way by the first coupler 20A is defeated all the way
Enter to the wavelength-division multiplex modulation module 30A, another way is input to the second coupler 70A, not with above preferred embodiment
With in the present embodiment, the wavelength-division multiplex modulation module 30A includes one first wavelength division multiplexer 31A, at least two light
Signal modulator 32A, the first wavelength division multiplexer 31A are arranged on at least two optical signal modulator 32A rear sides, often
A optical signal modulator 32A and each first coupler 20A are corresponded, and each first coupler 20A points
Light all the way out is input to the corresponding optical signal modulator 32A respectively, and each optical signal modulator 32A will come from
The continuous light modulation of the first coupler 20A is at being input to the first wavelength division multiplexer 31A, the first wave after pulsed light
Division multiplexer 31A will at least two-way pulsed light multiplex at exporting afterwards all the way；
Fiber amplifier 40A, the fiber amplifier 40A are received from the wavelength-division multiplex modulation module 30A at least
The pulsed light of two-way different wave length simultaneously amplifies output；
Three port circulator 50A, the three ports circulator 50A have first port 51A, second port 52A, Yi Ji
Three port 53A, the pulsed light of at least two-way different wave length exported from the fiber amplifier 40A is from the first port 51A
The three ports circulator 50A is inputted, is then output in test optical fiber by the second port 52A, at least two-way is different
When transmitting in testing optical fiber at least two back scattering occur respectively for the pulsed light of wavelength, wherein backward Rayleigh scattering and input
Optical wavelength is identical, therefore the corresponding backward Rayleigh scattering for generating at least two-way different wave length of pulsed light of at least two-way different wave length
Light, at least backward Rayleigh scattering light of two-way different wave length return to three port circulator by the second port 52A
50A is simultaneously exported from the third port 53A；
Second wavelength division multiplexer 60A, the second wavelength division multiplexer 60A is received to be exported from the three ports circulator 50A
At least two-way different wave length backward Rayleigh scattering light and the backward Rayleigh scattering light of at least two-way different wave length is separated, point
It is not exported from least two ports, the backward Rayleigh scattering light of at least two-way different wave length, which is matched to be input to respectively, to be had therewith
The second coupler 70A of the continuous light of phase co-wavelength, therefore two input ports input of each second coupler 70A
Light be all to be generated by the same laser 10A, i.e. the wavelength of two-beam is identical, meets coherent condition and interferes；
At least two photodetector 80A, data collector 90A and control analysis module 100A, wherein each described
Photodetector 80A and each second coupler 70A are corresponded, after the second coupler 70A is interfered
Interference light signal is input into the photodetector 80A, and interference light signal is converted into interference electricity by the photodetector 80A
Signal is input to the data collector 90A, and the data collector 90A carries out interference signal after high-speed sampling electric signal
It is input to the control analysis module 100A, the interference signal received is analyzed in the control analysis module 100A processing, thus
Know the perception information of optical fiber.
It is noted that in the present embodiment, each optical signal modulator 32A analyzes mould with the control respectively
The triggering for controlling the different optical signal modulator 32A is set in block 100A communication connection, the control analysis module 100A
Moment is different, the triggering moment of each optical signal modulator 32A controlled relative to upper one trigger described in
The triggering moment of optical signal modulator 32A is sequentially delayed backward, and delay time is less than trigger pulse cycle T.
For more specifically, the control analysis module 100A sets the optical signal modulator 32A as first
The optical signal modulator 32A of pulsed light is issued, the control analysis module 100A control triggers first sending pulsed light
Optical signal modulator 32A issue pulsed light, while triggering the data collector 90A to acquire the photodetector 80A defeated
Electric signal out, and recording triggering moment is T, is then delayed T/N* (N-1) from T, the control analysis module 100A control touching
It sends out optical signal modulator 32A described in n-th and issues pulsed light, while triggering the data collector 90A and acquiring the photoelectricity spy
The signal of device 80A output is surveyed, N is the quantity of the optical signal modulator 32A.That is, the adjacent light triggered
The interval time of signal modulator 32A is T/N.
In the present embodiment, the present embodiment is illustrated and disclosed so that the quantity of the optical signal modulator 32A is two
The content and feature of the multiple light courcess phase sensitive optical time domain reflectometer.Therefore, the delay time is trigger cycle T one
Half.Such as the measurement optical fiber triggering period of 10km long is 100us, second optical signal modulator 32A's triggered
The triggering moment delay 50us for the optical signal modulator 32A that triggering moment is triggered relative to first.Therefore one
In secondary measurement, the data collector 90A collects two paths of signals, i.e., has done to same point on spatial position and measured twice, surveys
Amount interval 50us, and the mode of single light source is only surveyed space same point once, and 100us, therefore the utility model are divided between measurement
The response frequency of phase sensitive optical time domain reflectometer is improved 2 times.
It is noted that the laser 10A, the first coupler 20A, the optical signal modulator 32A, described
Second coupler 70A, the quantity of the photodetector 80A are anti-in the multiple light courcess phase sensitive optical time domain of the utility model
Penetrate meter in it is unrestricted, for example, in the present embodiment with the laser 10A, the first coupler 20A, the optical signal
Modulator 32A, the second coupler 70A, the photodetector 80A quantity be to illustrate and disclose this for two
The content and feature of the multiple light courcess phase sensitive optical time domain reflectometer of utility model, but the laser 10A, described first
Coupler 20A, the optical signal modulator 32A, the second coupler 70A, the photodetector 80A quantity be two
A limitation that can not be considered as content and range to the multiple light courcess phase sensitive optical time domain reflectometer of the utility model.
Optionally, under the premise of following two：The wavelength for the continuous light that the different laser 10A is issued is different；First coupling
Clutch 20A, the optical signal modulator 32A, the second coupler 70A, the photodetector 80A quantity respectively with institute
The quantity for stating laser 10A is corresponding.Other in the multiple light courcess phase sensitive optical time domain reflectometer of the utility model can
In the example of energy, the laser 10A, the first coupler 20A, the optical signal modulator 32A, second coupler
70A, the photodetector 80A quantity also can be, but not limited to be implemented as 3,4,5 etc..
It will be appreciated by persons skilled in the art that when N number of institute using N number of laser 10A and respective numbers
When stating optical signal modulator 32A, the interval time of the adjacent optical signal modulator 32A triggered is T/N, n-th of hair
When the delay for the optical signal modulator 32A that the optical signal modulator 32A of raw triggering is triggered relative to first
Between be (T/N) * (n-1), i.e., n times have been surveyed to spatially same point in one-shot measurement, by response frequency promoted N times.N is indicated
The serial number for issuing the optical signal modulator 32A of pulsed light is executed, when for example, when n being 1,2,3 ..., respectively indicates the 1st
It is a, the 2nd, the 3rd ... the optical signal modulator 32A triggered.Illustratively, it when it is 3 that N, which is 5, n, indicates altogether
There are 5 optical signal modulator 32A, wherein the 3rd optical signal modulator 32A triggered is sent out relative to the 1st
The delay time of the optical signal modulator 32A of raw triggering is (T/5) * (3-1).
Preferably, the wavelength X1For 1550.12nm, the wavelength X2For 1550.92nm.
Preferably, the first coupler 20A is 1*2 coupler, and the second coupler 70A is 2*2 coupler.
Preferably, the optical signal modulator 32A is acousto-optic modulator.
It will be readily appreciated by those skilled in the art that the optical signal modulator 32A is implemented as sound in the present embodiment
Optical modulator can not be considered as content and range to the multiple light courcess phase sensitive optical time domain reflectometer of the utility model
Limitation.Optionally, in other possible examples of the multiple light courcess phase sensitive optical time domain reflectometer of the utility model,
The optical signal modulator 32A also may be implemented as electrooptic modulator.
It will be appreciated by persons skilled in the art that the data collector 90A can be muti-piece capture card, or
With multiple data acquisition channels of independent triggers function in same capture card.
It should be understood by those skilled in the art that foregoing description and the embodiments of the present invention shown in the drawings are only used as
It illustrates and is not intended to limit the utility model.The purpose of this utility model completely and effectively realizes.The function of the utility model
Energy and structural principle show and illustrate in embodiment, under without departing from the principle, the embodiments of the present invention
Can there are any deformation or modification.
Claims (8)
1. multiple light courcess phase sensitive optical time domain reflectometer, which is characterized in that including：
At least two issue the laser of the continuous light of different wave length；
At least two first couplers, each first coupler are corresponded with each laser respectively, and described the
The continuous light that one coupler is used to issue in the laser is divided into two-way；
At least two second couplers, wavelength-division multiplex modulation module, wherein each second coupler respectively with it is each described
First coupler corresponds, and is input to the wavelength-division multiplex tune all the way by the continuous light that first coupler is divided into two-way
Molding block, another way are input to second coupler, and the wavelength-division multiplex modulation module, which is set, to be received from institute
The continuous light of at least two-way for stating the first coupler is modulated into pulsed light and multiplex at exporting all the way；
Fiber amplifier, the fiber amplifier receive at least two-way different wave length from the wavelength-division multiplex modulation module
Pulsed light simultaneously amplifies output；
Three port circulators, three port circulator has first port, second port and third port, from the light
The pulsed light of at least two-way different wave length of fiber amplifier output inputs three port circulator from the first port, then
It is output in test optical fiber by the second port, at least the pulsed light of two-way different wave length transmits the time-division in test optical fiber
At least two back scattering do not occur, wherein backward Rayleigh scattering is identical as input optical wavelength, therefore at least two-way different wave length
The corresponding backward Rayleigh scattering light for generating at least two-way different wave length of pulsed light, at least backward Rayleigh of two-way different wave length dissipates
Light is penetrated to export by the second port back to three port circulator and from the third port；
Second wavelength division multiplexer, it is different that second wavelength division multiplexer receives at least two-way exported from three port circulator
The backward Rayleigh scattering light of wavelength simultaneously separates the backward Rayleigh scattering light of at least two-way different wave length, respectively from least two ends
Mouth output, the backward Rayleigh scattering light of at least two-way different wave length is matched respectively to be input to the continuous light of same wavelength
Second coupler interfered；
At least two photodetectors, data collector and control analysis module, wherein each photodetector and every
A second coupler corresponds, and the interference light signal after second coupler interferes is input into the light
Electric explorer, interference light signal is converted into interference electric signal and is input to the data collector by the photodetector, described
Interference signal is input to the control analysis module, the control analysis to after electric signal progress high-speed sampling by data collector
Resume module analyzes the interference signal received, to know the perception information of optical fiber.
2. multiple light courcess phase sensitive optical time domain reflectometer as described in claim 1, which is characterized in that the wavelength-division multiplex modulation
Module includes one first wavelength division multiplexer and an optical signal modulator, and first wavelength division multiplexer is arranged on the optical signal
Before modulator, first wavelength division multiplexer is by the photosynthetic wave of at least two-way exported from first coupler at inputting afterwards all the way
Into the optical signal modulator, the continuous light of at least two-way different wave length is modulated into pulse by the optical signal modulator simultaneously
Light is input to the fiber amplifier.
3. multiple light courcess phase sensitive optical time domain reflectometer as described in claim 1, which is characterized in that the wavelength-division multiplex modulation
Module includes one first wavelength division multiplexer, at least two optical signal modulators, and first wavelength division multiplexer is arranged at least
On rear side of two optical signal modulators, each optical signal modulator and each first coupler are corresponded, often
The light all the way that a first coupler separates is input to the corresponding optical signal modulator, each optical signal respectively
Modulator by the continuous light modulation from first coupler at being input to first wavelength division multiplexer after pulsed light, it is described
The near few two-way pulsed light multiplex of first wavelength division multiplexer at being input in the fiber amplifier afterwards all the way.
4. multiple light courcess phase sensitive optical time domain reflectometer as claimed in claim 3, which is characterized in that each optical signal tune
Device processed is communicated to connect with the control analysis module respectively, and the control analysis module, which is set, controls the different optical signals
The triggering moment of modulator is different, and the triggering moment of each optical signal modulator is controlled to be touched relative to upper one
The triggering moment of the optical signal modulator of hair is sequentially delayed backward, and delay time is less than trigger pulse cycle T.
5. multiple light courcess phase sensitive optical time domain reflectometer as claimed in claim 4, which is characterized in that the adjacent institute triggered
The interval time for stating optical signal modulator is T/N, and N is the quantity of the optical signal modulator.
6. such as claim 1, multiple light courcess phase sensitive optical time domain reflectometer described in any one of 2,3,4, which is characterized in that institute
Stating the first coupler is 1*2 coupler, and second coupler is 2*2 coupler.
7. such as claim 2, multiple light courcess phase sensitive optical time domain reflectometer described in any one of 3,4, which is characterized in that described
Optical signal modulator is acousto-optic modulator.
8. such as claim 2, multiple light courcess phase sensitive optical time domain reflectometer described in any one of 3,4, which is characterized in that described
Optical signal modulator is electrooptic modulator.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108519147A (en) * | 2018-04-25 | 2018-09-11 | 浙江杰昆科技有限公司 | Multiple light courcess phase sensitive optical time domain reflectometer and its method |
| CN110319917A (en) * | 2019-08-08 | 2019-10-11 | 北京大学 | A kind of distribution type fiber-optic acoustic wave sensing system and its method for sensing |
| CN115882937A (en) * | 2022-11-30 | 2023-03-31 | 江苏亮点光电研究有限公司 | Optical time domain reflection-based optical fiber laser state online monitoring optical path and method |
| CN116743259A (en) * | 2023-08-14 | 2023-09-12 | 之江实验室 | Heterogeneous integrated light emitting chip |
| CN117091686A (en) * | 2023-09-04 | 2023-11-21 | 江南大学 | Distributed optical fiber vibration sensor based on frequency division multiplexing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519147A (en) * | 2018-04-25 | 2018-09-11 | 浙江杰昆科技有限公司 | Multiple light courcess phase sensitive optical time domain reflectometer and its method |
| CN110319917A (en) * | 2019-08-08 | 2019-10-11 | 北京大学 | A kind of distribution type fiber-optic acoustic wave sensing system and its method for sensing |
| CN115882937A (en) * | 2022-11-30 | 2023-03-31 | 江苏亮点光电研究有限公司 | Optical time domain reflection-based optical fiber laser state online monitoring optical path and method |
| CN115882937B (en) * | 2022-11-30 | 2024-01-09 | 江苏亮点光电研究有限公司 | Optical time domain reflection-based optical fiber laser state online monitoring light path and method |
| CN116743259A (en) * | 2023-08-14 | 2023-09-12 | 之江实验室 | Heterogeneous integrated light emitting chip |
| CN116743259B (en) * | 2023-08-14 | 2023-11-14 | 之江实验室 | Heterogeneous integrated light emitting chip |
| CN117091686A (en) * | 2023-09-04 | 2023-11-21 | 江南大学 | Distributed optical fiber vibration sensor based on frequency division multiplexing |
| CN117091686B (en) * | 2023-09-04 | 2024-04-09 | 江南大学 | Distributed optical fiber vibration sensor based on frequency division multiplexing |
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