CN207720138U - A kind of OTDR devices based on multi-channel optical fibre optical monitoring signal - Google Patents
A kind of OTDR devices based on multi-channel optical fibre optical monitoring signal Download PDFInfo
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Abstract
The utility model discloses a kind of OTDR devices based on multi-channel optical fibre optical monitoring signal, including main control unit, light transmission unit, optical branching unit, oscillography unit, N number of coupling unit and N number of optical branching probe unit, the main control unit is connect with the smooth transmission unit and oscillography unit respectively, the smooth transmission unit is connect with the optical branching unit, the optical branching unit correspondence is connect with N number of coupling unit, correspondence is connect the input terminal of each coupling unit with optical branching unit and an optical branching probe unit respectively, each coupling unit output end correspondence is connect with a testing fiber, each optical branching probe unit correspondence is connect with the main control unit.The utility model advantage is：It can be carried out at the same time monitoring and the search and orientation of multichannel testing fiber fault point, and test speed is fast, measuring accuracy is high.
Description
Technical field
The utility model is related to optical time domain reflection field, more particularly to a kind of OTDR based on multi-channel optical fibre optical monitoring signal
Device.
Background technology
Optical time domain reflectometer (Optical Time-Domain Reflectometry, OTDR) is using light in optical fiber
The optoelectronic integration instrument of backscattering caused by Rayleigh scattering and Fresnel reflection when middle transmission and manufactured precision, it
Be widely used among the maintenance of lightguide cable link, construction, can carry out fiber lengths, the transmission attenuation of optical fiber, connector decaying and
The measurement of fault location etc..
It is presently used for the OTDR of fiber failure position monitor, there are mainly two types of i.e.：For the other Dim light measurement of single-photon-level
Single photon detection OTDR and common OTDR for the other light detection of non-single-photon-level；Avalanche photodide (APD) conduct
A kind of common photosensitive detection device in laser communication field, because have higher detection sensitivity, be in OTDR one kind can not or
Scarce composition device.
Wherein, the avalanche photodide of single photon detection OTDR is operated in gate Geiger mode angular position digitizer, and the snow of common OTDR
Avalanche photo diode is operated in linear model；It is operated in the avalanche photodide of linear model, without considering afterpulse effect,
It can be operated in continuous signal acquisition state, have the advantages that time of measuring is fast, but due to being operated in the snowslide of linear model
Photodiode gain is low, can not detect small and weak optical signal, and therefore, the measurement accuracy and measurement distance of common OTDR are limited
System.
Although single photon detection OTDR may detect the atomic low light signals also smaller than thermal noise, can obtain than common
The higher measurement accuracy of OTDR, the dynamic range of farther measurement distance and bigger, the shortcomings that common OTDR can be made up, but
It is because the avalanche photodide of single photon detection OTDR is operated under gate Geiger mode angular position digitizer, to be influenced, had certain by afterpulse
Dead time, cause the gate pulse repetition rate of single-photon detector low, can only operate in point by point scanning pattern, and complete primary
Detection mission generally requires longer time；When measurement accuracy is higher, number of scan points is more, then needed for single photon detection OTDR
Detection time is longer；When afterpulse probability is bigger, then the dead time being arranged required for single photon detection OTDR is longer.
In addition, because avalanche photodide is capacitive device, when door pulse signal load is right on avalanche photodide
When it carries out charge and discharge, corresponding noise can be introduced, the snowslide useful signal of photoproduction is flooded, result of detection is influenced；Temperature simultaneously
The variation of degree can also have some impact on the detection performance of avalanche photodide, can cause avalanche photodide workability
The unstable positioning made to fiber failure point and lookup of energy are inaccurate.
Invention content
The purpose of this utility model is to provide a kind of OTDR devices based on multi-channel optical fibre optical monitoring signal, to solve
The defects of background technology.
To achieve the above object, the technical solution that the utility model is taken is：One kind being based on multi-channel optical fibre optical monitoring signal
OTDR devices, including main control unit, light transmission unit, optical branching unit, oscillography unit, N number of coupling unit and N number of optical branching
Probe unit, the main control unit are connect with the smooth transmission unit and oscillography unit respectively, the smooth transmission unit with it is described
Optical branching unit connects, and the optical branching unit correspondence is connect with N number of coupling unit, the input of each coupling unit
End correspondence is connect with optical branching unit and an optical branching probe unit, and each coupling unit output end corresponds to and a light to be measured
Fibre connection, each optical branching probe unit correspondence are connect with the main control unit.
Further, the main control unit includes at microcontroller, pulse signal generator, signal decaying driver and data
Device is managed, the pulse signal generator, signal decaying driver and data processor are connect with the microcontroller respectively；
The smooth transmission unit include light-pulse generator and adjustable attenuator, the light-pulse generator respectively with the pulse signal
Generator and adjustable attenuator connection, the adjustable attenuator are decayed with the signal driver and optical branching unit respectively
Connection；
Each optical branching probe unit includes optical splitter, a common detection unit and a single-photon detecting of a 1x2
Unit is surveyed, each 1x2 optical splitters input terminal correspondence is connect with a coupling unit, each 1x2 optical splitters output end point
It Dui Ying not be connect with a common detection unit and a single photon detection unit.
Further, the optical branching unit is 1xN optical splitters；The oscillography unit is waveform oscilloscope, and the waveform
Display includes N number of viewing area to applied to the detection waveform curve for showing the optical branching probe unit output；Often
A coupling unit is directional coupler or circulator；Wherein, the integer that N is >=2.
Further, each common detection unit includes sequentially connected first photoelectric detection module, filter, the
One signal amplifier and the first A/D converter, the one of also corresponding and a 1x2 the optical splitter of each first photoelectric detection module
Output port connects, and also correspondence is connect each first A/D converter with the data processor of main control unit, Mei Gesuo
It includes the first avalanche photodide, the first temperature control module and the first Package boxes to state the first photoelectric detection module；Each
First temperature control module includes the first refrigerator, primary heater and the first temperature sensor, each first refrigeration
Device and primary heater are respectively connect with the microcontroller of main control unit, each first temperature sensor respectively with it is described
The pin of the microcontroller of main control unit and one first avalanche photodide connects, and each first photodetection mould is corresponding
The first avalanche photodide, the first refrigerator, primary heater and the first temperature sensor correspondence be encapsulated in an institute
It states in the first Package boxes.
Further, each single photon detection unit includes the second photoelectric detection module, biasing module, clock mould
Block, portal vein die block, noise suppression module, shaping pulse module and photon counter, each biasing module are right respectively
It should be connect with the microcontroller of main control unit and one second photoelectric detection module, each clock module corresponds to and master control list respectively
The pulse signal generator of member and portal vein die block connection, each portal vein die block correspond to the microcontroller with main control unit
And one second photoelectric detection module connection, each noise suppression module are corresponding with one second photoelectric detection module and a pulse respectively
Shaping Module connects, and each photon counter is corresponding respectively to be connected with the data processor of main control unit and a shaping pulse module
It connects, each second photoelectric detection module correspondence is connect with an output port of a 1x2 optical splitters, each second light
Electric detecting module includes the second avalanche photodide, the second temperature control module and the second Package boxes；Each described second
Temperature control module includes the second refrigerator, secondary heater and second temperature sensor, each second refrigerator and second
Respectively correspondence is connect heater with the microcontroller of main control unit, the respectively corresponding and master control of each second temperature sensor
The pin of the microcontroller of unit and one second avalanche photodide connects, and each second photoelectric detection module is corresponding
Second avalanche photodide, the second refrigerator, secondary heater and second temperature sensor correspondence are encapsulated in described in one
In second Package boxes.
Further, each biasing module is voltage source module, and the respectively corresponding microcontroller with main control unit
Connection and correspondence are connect with the cathode of one second avalanche photodide；Each biasing module is used to as the company of being corresponding to it
The second avalanche photodide connect provides the reverse bias voltage needed for work.
Further, each portal vein die block is gate generator, and correspondence is connect with a clock module respectively
And correspondence connect with the cathode of one second avalanche photodide, each the portal vein die block include phase-locked loop circuit,
The output end correspondence of frequency divider and second signal amplifier, each phase-locked loop circuit is connect with a second signal amplifier,
The input terminal correspondence of each phase-locked loop circuit is connect with a clock module, and each phase-locked loop circuit includes to be sequentially connected
Phase discriminator, loop filter and voltage controlled oscillator；Each portal vein die block is used to output gate-control signal, is right therewith
The second avalanche photodide that should be connected carries out charge and discharge control, realizes the snowslide to the second avalanche photodide and is quenched
Process control, each clock module is used to control the portal vein die block for connection of being corresponding to it and pulse signal generator is same
Step triggering work, makes the biasing voltage signal that the gate-control signal that portal vein die block exports is exported with biasing module according to the side of sequential
Formula is loaded on the second avalanche photodide, and the second avalanche photodide is made to be operated under Geiger gating patterns, to real
The existing other light intensity signal detection of single-photon-level.
Further, each noise suppression module includes bandpass filter, low-pass filter and third signal amplifier；
Each bandpass filter input terminal correspondence is connect with a portal vein die block output end, each bandpass filter output end
Correspondence is connect with the cathode of one second avalanche photodide；Each low-pass filter input terminal corresponds to and one second snowslide
The anode of photodiode connects, and each first low pass filter output is corresponded to be connected with a third signal amplifier input terminal
It connects；Each third signal amplifier output end correspondence is connect with a shaping pulse module；Each bandpass filter is equal
For filtering out caused sideband noise and harmonic noise signals in the gate-control signal by corresponding portal vein die block output；Each institute
Low-pass filter is stated to be used to filter out introduced by the gate-control signal for corresponding to the output of portal vein die block and avenge by corresponding second
The noise signal of institute's output after avalanche photo diode photoelectric conversion, therefrom obtains effective photo-generated carrier avalanche signal.
Further, each shaping pulse module includes pulse amplitude discriminator, pulse shaper and the second analog/digital conversion
Device；Each pulse amplitude discriminator input terminal correspondence is connect with a third signal amplifier output end, each pulse amplitude discrimination
Device output end correspondence is connect with a pulse shaper input terminal, and each pulse shaper output end corresponds to and one second
A/D converter input terminal connects, and each second A/D converter output end is corresponded to be connected with a photon counter input terminal
It connects, each photon counter output end correspondence is connect with the data processor of main control unit.
Compared with prior art, the utility model has the beneficial effects that：The utility model can carry out multichannel testing fiber
Fault point is accurately positioned and searches, and is conducive to the O＆M service work efficiency and drop that improve on-stream monitoring personnel to fibre circuit
The input of the low monitoring expense to optical fiber link, has many advantages, such as that work efficiency is high, measurement result is accurate and monitoring velocity is fast.
Description of the drawings
Fig. 1 is the structure diagram of OTDR device of the utility model based on multi-channel optical fibre optical monitoring signal；
Fig. 2 is the specific embodiment structure diagram of OTDR device of the utility model based on multi-channel optical fibre optical monitoring signal；
Fig. 3 is the structure diagram based on each common detection unit in Fig. 2；
Fig. 4 is the structure diagram based on each single photon detection unit in Fig. 3；
Fig. 5 is that the circuit of the portal vein die block based on Fig. 4 connects block diagram；
In figure：1, main control unit；11, microcontroller；12, pulse signal generator；13, signal decaying driver；14, data
Processor；2, light transmission unit；21, light-pulse generator；22, adjustable attenuator；3, optical branching unit；4, oscillography unit；5, it couples
Unit；6, optical branching probe unit；61,1x2 optical splitters；62, common detection unit；621, the first photoelectric detection module；621a、
First avalanche photodide；621b, the first temperature control module；621b-1, the first refrigerator；621b-2, primary heater；
621b-3, the first temperature sensor；621c, the first Package boxes；622, filter；623, the first signal amplifier；624,
One A/D converter；63, single photon detection unit；631, the second photoelectric detection module；631a, the second avalanche photodide；
631b, the second temperature control module；631b-1, the second refrigerator；631b-2, secondary heater；631b-3, second temperature sensor；
631c, the second Package boxes；632, biasing module；633, clock module；634, portal vein die block；634a, phase-locked loop circuit；
634b, frequency divider；634c, second signal amplifier；635, noise suppression module；635a, bandpass filter；635b, low pass filtered
Wave device；635c, third signal amplifier；636, shaping pulse module；636a, pulse amplitude discriminator；636b, pulse shaper；
636c, the second A/D converter；637, photon counter；7, testing fiber.
Specific implementation mode
To make the technical means, creative features, achievement of purpose, and effectiveness of the utility model be easy to understand, below
With reference to the drawings and specific embodiments, it is expanded on further how the utility model is implemented.
As shown in Figure 1, a kind of OTDR devices based on multi-channel optical fibre optical monitoring signal provided by the utility model, including master
Control unit 1, light transmission unit 2, optical branching unit 3, oscillography unit 4, N number of coupling unit 5 and N number of optical branching probe unit 6；It is main
Control unit 1 is connect with 1 smooth transmission unit 2 and oscillography unit 4 respectively；Light transmission unit 2 is connect with optical branching unit 3, optical branching
The correspondence of unit 3 is connect with N number of coupling unit 5, and the input terminal of each coupling unit 5 corresponds to an output with optical branching unit 3
End and an optical branching probe unit 6 connection, 5 output end of each coupling unit correspondence are connect with a testing fiber 7；Each optical branching
The correspondence of probe unit 6 is connect with main control unit 1.
Such as Fig. 2, in the present embodiment, main control unit 1 includes microcontroller 11, pulse signal generator 12, signal decaying
Driver 13 and data processor 14, pulse signal generator 12, signal decaying driver 13 and data processor 14 are respectively
It is connect with microcontroller 11；
Light transmission unit 2 includes light-pulse generator 21 and adjustable attenuator 22, and light-pulse generator 21 occurs with pulse signal respectively
Device 12 and adjustable attenuator 22 connect, and adjustable attenuator 22 is connect with signal decaying driver 13 and optical branching unit 3 respectively；Arteries and veins
Wash the transmitting of source 21 off is the high speed near infrared light of 1550nm wave bands, and optical branching unit 3 is 1xN optical splitters；
Oscillography unit 4 is waveform oscilloscope, and is provided on waveform oscilloscope N number of to being applied to show that optical branching detection is single
The display area of the detection waveform curve of 6 output of member；
Each coupling unit 5 is a directional coupler or a circulator；
Each optical branching probe unit 6 includes optical splitter 61, a common detection unit 62 and a single-photon detecting of a 1x2
Survey unit 63.
Wherein, the integer that N is >=2 sees that figure is accustomed to according to common form, and setting N is best equal to 4.
As shown in Figure 3, wherein each common detection unit 62 include sequentially connected first photoelectric detection module 621,
Filter 622, the first signal amplifier 623 and the first A/D converter 624, the input of each first photoelectric detection module 621
End correspondence is connect with an output port of the optical splitter 61 of a 1x2, and each first A/D converter 624 also corresponds to and master control
The data processor 14 of unit 1 connects；
Each first photoelectric detection module 621 includes the first avalanche photodide 621a, the first temperature control module
621b and the first Package boxes 621c, each first temperature control module 621b includes the first refrigerator 621b-1, primary heater
621b-2 and the first temperature sensor 621b-3, each first refrigerator 621b-1 and primary heater 621b-2 respectively with master
Control unit 1 microcontroller 11 connect, each first temperature sensor 621b-3 respectively with the microcontroller of main control unit 1 11 and one
The pin of first avalanche photodide 621a connects, 621 corresponding first avalanche optoelectronic of each first photoelectric detection module
The corresponding encapsulation of diode 621a, the first refrigerator 621b-1, primary heater 621b-2 and the first temperature sensor 621b-3
In a first Package boxes 621c, each first temperature control module 621b passes through the first refrigerator 621b-1 and primary heater
621b-2 adjusts the temperature in corresponding first Package boxes 621c, by being sealed in corresponding first Package boxes 621c
First temperature sensor 621b-3 of dress in real time feeds back the operating temperature of the first avalanche photodide 621a sensed
To the microcontroller 11 of main control unit 1, the first refrigerator 621b-1 and primary heater 621b-2 refrigeration are controlled by microcontroller 11
Or computer heating control, realize temperature regulation and control in the first Package boxes 621c so that the first avalanche photodide 621a moment was in
Under suitable operating temperature, and then the effective performance for avoiding the first avalanche photodide 621a caused by temperature increases is not
Stablize, influences the accuracy of the light intensity signal result of detection of common detection unit.
As shown in Figure 4, wherein each single photon detection unit 63 includes the second photoelectric detection module 631, biasing module
632, clock module 633, portal vein die block 634, noise suppression module 635, shaping pulse module 636 and photon counter 637；
632 input terminal of each biasing module correspondence is connect with the microcontroller 11 of main control unit 1, each biasing module 632
Output end correspondence is connect with the input terminal of one second photoelectric detection module 631, the input of each second photoelectric detection module 631
Also correspondence is connect with the output end of an output port of the optical splitter 61 of a 1x2 and a portal vein die block 634 respectively at end, each
Another output port correspondence of the optical splitter 61 of 1x2 is connect with the input terminal of one first photoelectric detection module 621, each second light
The output end of electric detecting module 631 is corresponding with a sequentially connected noise suppression module 635, a shaping pulse module 636 and one
Photon counter 637, the input terminal of each portal vein die block 634 correspond to microcontroller 11 and a clock with main control unit 1 respectively
Module 633 connects；Each clock module 633 also corresponds to the pulse signal generator 12 and microcontroller 11 with main control unit 1 respectively
Connection, also correspondence is connect each photon counter 637 with the data processor 14 of main control unit 1 respectively；
Each second photoelectric detection module 631 includes the second avalanche photodide 631a, the second temperature control module
631b and the second Package boxes 631c；Each second temperature control module 631b includes the second refrigerator 631b-1, secondary heater
631b-2 and second temperature sensor 631b-3, each second refrigerator 631b-1 and secondary heater 631b-2 respectively with master
Control unit 1 microcontroller 11 connect, each second temperature sensor 631b-3 respectively with the microcontroller of main control unit 1 11 and one
The pin of second avalanche photodide 631a connects, 631 corresponding second avalanche optoelectronic of each second photoelectric detection module
The corresponding encapsulation of diode 631a, the second refrigerator 631b-1, secondary heater 631b-2 and second temperature sensor 631b-3
In a second Package boxes 631c, each second temperature control module 631b passes through the second refrigerator 631b-1 and secondary heater
631b-2 adjusts the temperature in corresponding second Package boxes 631c, by being sealed in corresponding second Package boxes 631c
First temperature sensor 631b-3 of dress in real time feeds back the operating temperature of the second avalanche photodide 631a sensed
To the microcontroller 11 of main control unit 1, the second refrigerator 631b-1 and secondary heater 631b-2 refrigeration are controlled by microcontroller 11
Or computer heating control, realize temperature regulation and control in the first Package boxes 621c so that the second avalanche photodide 631a moment was in
Under suitable operating temperature, and then the effective performance for avoiding the second avalanche photodide 631a caused by temperature increases is not
Stablize, influences the accuracy of the light intensity signal result of detection of single photon detection unit.
Each biasing module 632 is voltage source module, and respectively it is corresponding connect with the microcontroller 11 of main control unit 1 and
Correspondence is connect with the cathode of one second avalanche photodide 631a；Each biasing module 632 is used to as connection of being corresponding to it
The second avalanche photodide 631a the reverse bias voltage needed for work is provided.
Each portal vein die block 634 is gate generator, and corresponding and a clock module 633 and a bias mould respectively
The connection of block 632, as shown in figure 5, each portal vein die block 634 includes phase-locked loop circuit 634a, frequency divider 634b and the
The output end correspondence of binary signal amplifier 634c, each phase-locked loop circuit 634a are connect with a second signal amplifier 634c, often
The input terminal correspondence of a phase-locked loop circuit 634a is connect with a clock module 633, and each phase-locked loop circuit 634a includes to connect successively
Phase discriminator the 634a-1 path filters 634a-2 and voltage controlled oscillator 634a-3 connect；Each portal vein die block 634 is used to export
Gate-control signal be corresponding to it connection biasing module 632 carry out charge and discharge control, generate load in two pole of the second avalanche optoelectronic
Reverse bias voltage on pipe 631a realizes the snowslide to the second avalanche photodide 631a and process control is quenched；
When biasing module 632 generate reverse bias voltage load on the second avalanche photodide 631a and more than etc.
When the second avalanche photodide 631a avalanche voltages, then the returning through Rayleigh scattering and Fresnel reflection from testing fiber 7
The photon returned, which will be incident in the second avalanche photodide 631a, generates a large amount of photo-generated carrier, that is, forms avalanche signal；
When the reverse bias voltage that biasing module 632 generates loads on the second avalanche photodide 631a and less than the
When two avalanche photodide 631a avalanche voltages, then return through Rayleigh scattering and Fresnel reflection from testing fiber 7
Photon is not enough to generate photo-generated carrier, i.e. the second avalanche photodide 63a is quenched；
Each clock module 633 is used to control the portal vein die block 634 and pulse signal generator of connection of being corresponding to it
12 synchronize triggering work, and the gate-control signal that portal vein die block 634 exports is made to believe with the pulsed light that pulse signal generator 12 is sent out
It number is loaded into the way of clock on the second avalanche photodide 631a, the second avalanche photodide 631a is made to be operated in
Under Geiger gating patterns, to realize the other light intensity signal detection of single-photon-level.
Each noise suppression module 635 includes bandpass filter 635a, low-pass filter 635b and third signal amplifier
635c；Each bandpass filter 635a input terminals correspondence is connect with 634 output end of a portal vein die block, each bandpass filter
635a output ends correspondence is connect with the cathode of one second avalanche photodide 631a；Each low-pass filter 635b input terminals pair
The anode of the second avalanche photodides of Ying Yuyi 631a connects, and each low-pass filter 635b output ends are corresponded to be believed with a third
The connection of number amplifier 635c input terminals；Each third signal amplifier 635c output ends are corresponded to be connected with a shaping pulse module 636
It connects；
Each bandpass filter 635a is used to filter out and be brought in the gate-control signal exported by corresponding portal vein die block 634
Sideband noise and harmonic noise signals；
Each low-pass filter 635b is used to filter out introduced by corresponding to the gate-control signal that portal vein die block 634 exports
And after corresponding second avalanche photodide 631a photoelectric conversions institute's output noise signal, therefrom obtain effective photoproduction
Carrier avalanche signal.
Each shaping pulse module 636 includes pulse amplitude discriminator 636a, pulse shaper 636b and the second analog/digital conversion
Device 636c；Each pulse amplitude discriminator 636a input terminals correspondence is connect with a third signal amplifier 636c output ends, each pulse
Amplitude discriminator 636a output ends correspondence is connect with a pulse shaper 636b input terminals, each pulse shaper 636b output ends
Correspondence is connect with one second A/D converter 636c input terminals, and each second A/D converter 636c output ends correspond to and a light
637 input terminal of sub-count device connects, 637 output end of each photon counter corresponding data processor 14 with main control unit 1
Connection.
Each shaping pulse module 636 by the effective snowslide analog signal shaping obtained for being converted to standardized digital signal
It is corresponding on waveform oscilloscope after 14 analyzing processing of digital processing unit in output to the digital processing unit 14 of main control unit
Corresponding OTDR detection light waveforms signal is shown at display area.
In the present embodiment, the first avalanche photodide 621a and the second avalanche photodide 631a are selected and are
InGaAs or InP avalanche photodides.
Finally illustrate, the above description is only the embodiments of the present invention, is not intended to limit the patent of the utility model
Range, equivalent structure or equivalent flow shift made by using the description of the utility model and the drawings, or directly or
Other related technical areas are used in indirectly, are equally included in the patent within the scope of the utility model.
Claims (9)
1. a kind of OTDR devices based on multi-channel optical fibre optical monitoring signal, it is characterised in that：Including main control unit (1), light are sent
Unit (2), optical branching unit (3), oscillography unit (4), N number of coupling unit (5) and N number of optical branching probe unit (6), the master
Control unit (1) is connect with the smooth transmission unit (2) and oscillography unit (4) respectively, the smooth transmission unit (2) and the light point
Road unit (3) connects, and optical branching unit (3) correspondence is connect with N number of coupling unit (5), each coupling unit
(5) input terminal correspondence is connect with the optical branching unit (3) and an optical branching probe unit (6), and each coupling is single
First (5) output end correspondence is connect with a testing fiber (7), and each optical branching probe unit (6) corresponds to and the master control
Unit (1) connects.
2. the OTDR devices according to claim 1 based on multi-channel optical fibre optical monitoring signal, it is characterised in that：The master control
Unit (1) includes microcontroller (11), pulse signal generator (12), signal decaying driver (13) and data processor
(14), the pulse signal generator (12), signal decaying driver (13) and data processor (14) respectively with the monolithic
Machine (11) connects；
The smooth transmission unit (2) include light-pulse generator (21) and adjustable attenuator (22), the light-pulse generator (21) respectively with
The pulse signal generator (12) and the adjustable attenuator (22) connection, the adjustable attenuator (22) respectively with the letter
Number decaying driver (13) and optical branching unit (3) connection；
Each optical branching probe unit (6) includes optical splitter (61), a common detection unit (62) and a list of a 1x2
Photon detection unit (63), each 1x2 optical splitters (61) input terminal correspondence is connect with a coupling unit (5), each described
Correspondence is connect 1x2 optical splitters (61) output end with a common detection unit (62) and a single photon detection unit (63) respectively.
3. the OTDR devices according to claim 1 based on multi-channel optical fibre optical monitoring signal, it is characterised in that：The light point
Road unit (3) is 1xN optical splitters, and the oscillography unit (4) is waveform oscilloscope, and the waveform oscilloscope includes N number of waveform
Curve viewing area；Each coupling unit (5) is directional coupler or circulator；Wherein, the integer that N is >=2.
4. the OTDR devices according to claim 2 based on multi-channel optical fibre optical monitoring signal, it is characterised in that：It is each described
Common detection unit (62) is put comprising sequentially connected first photoelectric detection module (621), filter (622), the first signal
Big device (623) and the first A/D converter (624), each first photoelectric detection module (621) also corresponding point with a 1x2
One output port of light device (61) connects, and each first A/D converter (624) is also corresponding and main control unit (1)
Data processor (14) connects, and each first photoelectric detection module (621) includes the first avalanche photodide
(621a), the first temperature control module (621b) and the first Package boxes (621c)；Each first temperature control module (621b) includes
There are the first refrigerator (621b-1), primary heater (621b-2) and the first temperature sensor (621b-3), each described first
Refrigerator (621b-1) and primary heater (621b-2) are respectively connect with the microcontroller of main control unit (1) (11), Mei Gesuo
State the first temperature sensor (621b-3) respectively with the microcontroller of the main control unit (1) (11) and one first avalanche optoelectronic two
The pin of pole pipe (621a) connects, each corresponding first avalanche photodide of first photoelectric detection module (621)
The corresponding envelope of (621a), the first refrigerator (621b-1), primary heater (621b-2) and the first temperature sensor (621b-3)
In first Package boxes (621c).
5. the OTDR devices according to claim 2 based on multi-channel optical fibre optical monitoring signal, it is characterised in that：It is each described
Single photon detection unit (63) includes the second photoelectric detection module (631), biasing module (632), clock module (633), door
Pulse module (634), noise suppression module (635), shaping pulse module (636) and photon counter (637), it is each described inclined
Correspondence is connect die block (632) with the microcontroller (11) of main control unit (1) and one second photoelectric detection module (631) respectively,
Each clock module (633) corresponds to the pulse signal generator (12) and a portal vein die block with main control unit (1) respectively
(634) it connects, each portal vein die block (634) corresponds to the microcontroller (11) and one second light with main control unit (1) respectively
The connection of electric detecting module (631), each noise suppression module (635) respectively it is corresponding with one second photoelectric detection module (631) and
One shaping pulse module (636) connects, and each photon counter (637) corresponds to the data processor with main control unit (1) respectively
(14) and a shaping pulse module (636) connection, each second photoelectric detection module (631) correspond to and 1x2 light splitting
One output port of device (61) connects, and each second photoelectric detection module (631) includes two pole of the second avalanche optoelectronic
Manage (631a), the second temperature control module (631b) and the second Package boxes (631c)；Each second temperature control module (631b) packet
Containing the second refrigerator (631b-1), secondary heater (631b-2) and second temperature sensor (631b-3), each described the
Two refrigerators (631b-1) and secondary heater (631b-2) are respectively connect with the microcontroller of main control unit (1) (11), each
The second temperature sensor (631b-3) respectively with two pole of the microcontroller of main control unit (1) (11) and one second avalanche optoelectronic
Manage the pin connection of (631a), each corresponding second avalanche photodide of second photoelectric detection module (631)
The corresponding envelope of (631a), the second refrigerator (631b-1), secondary heater (631b-2) and second temperature sensor (631b-3)
In second Package boxes (631c).
6. the OTDR devices according to claim 5 based on multi-channel optical fibre optical monitoring signal, it is characterised in that：It is each described
Biasing module (632) is voltage source module, and respectively it is corresponding with the connection of the microcontroller (11) of main control unit (1) and it is corresponding and
The cathode of one second avalanche photodide (631a) connects.
7. the OTDR devices according to claim 5 based on multi-channel optical fibre optical monitoring signal, it is characterised in that：It is each described
Portal vein die block (634) is gate generator, and respectively corresponding with a clock module (633) connection and corresponding and one the
The cathode of two avalanche photodides (631a) connects, and each portal vein die block (634) includes phase-locked loop circuit
(634a), frequency divider (634b) and second signal amplifier (634c), the output end pair of each phase-locked loop circuit (634a)
Ying Yuyi second signals amplifier (634c) connects, and the input terminal of each phase-locked loop circuit (634a) corresponds to and a clock mould
Block (633) connects, and each phase-locked loop circuit (634a) includes sequentially connected phase discriminator (634a-1), loop filter
(634a-2) and voltage controlled oscillator (634a-3).
8. the OTDR devices according to claim 5 based on multi-channel optical fibre optical monitoring signal, it is characterised in that：It is each described
Noise suppression module (635) includes bandpass filter (635a), low-pass filter (635b) and third signal amplifier (635c)；
Each bandpass filter (635a) input terminal correspondence is connect with portal vein die block (634) output end, each band logical
Filter (635a) output end correspondence is connect with the cathode of one second avalanche photodide (631a)；Each low-pass filtering
Device (635b) input terminal correspondence is connect with the anode of one second avalanche photodide (631a), each low-pass filter
(635b) output end correspondence is connect with third signal amplifier (635c) input terminal；Each third signal amplifier
(635c) output end correspondence is connect with a shaping pulse module (636).
9. the OTDR devices according to claim 8 based on multi-channel optical fibre optical monitoring signal, it is characterised in that：It is each described
Shaping pulse module (636) includes pulse amplitude discriminator (636a), pulse shaper (636b) and the second A/D converter
(636c)；Each pulse amplitude discriminator (636a) input terminal correspondence is connect with third signal amplifier (635c) output end,
Each pulse amplitude discriminator (636a) output end correspondence is connect with a pulse shaper (636b) input terminal, each arteries and veins
Shaping circuit (636b) output end correspondence is rushed to connect with one second A/D converter (636c) input terminal, each second mould/
Number converter (636c) output end correspondence is connect with a photon counter (637) input terminal, each photon counter (637)
Output end correspondence is connect with the data processor (14) of main control unit (1).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108075828A (en) * | 2017-12-16 | 2018-05-25 | 国网湖北省电力有限公司信息通信公司 | A kind of OTDR devices based on multi-channel optical fibre optical monitoring signal |
| CN110178065A (en) * | 2019-04-11 | 2019-08-27 | 深圳市亚派光电器件有限公司 | Light emission component and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108075828A (en) * | 2017-12-16 | 2018-05-25 | 国网湖北省电力有限公司信息通信公司 | A kind of OTDR devices based on multi-channel optical fibre optical monitoring signal |
| CN110178065A (en) * | 2019-04-11 | 2019-08-27 | 深圳市亚派光电器件有限公司 | Light emission component and preparation method thereof |
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