CN108075828B - OTDR device based on multichannel optical fiber optical signal monitoring - Google Patents
OTDR device based on multichannel optical fiber optical signal monitoring Download PDFInfo
- Publication number
- CN108075828B CN108075828B CN201711355335.5A CN201711355335A CN108075828B CN 108075828 B CN108075828 B CN 108075828B CN 201711355335 A CN201711355335 A CN 201711355335A CN 108075828 B CN108075828 B CN 108075828B
- Authority
- CN
- China
- Prior art keywords
- module
- unit
- correspondingly connected
- optical
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 90
- 239000013307 optical fiber Substances 0.000 title claims abstract description 25
- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 238000000253 optical time-domain reflectometry Methods 0.000 title claims abstract 7
- 238000001514 detection method Methods 0.000 claims abstract description 98
- 230000008878 coupling Effects 0.000 claims abstract description 22
- 238000010168 coupling process Methods 0.000 claims abstract description 22
- 238000005859 coupling reaction Methods 0.000 claims abstract description 22
- 238000007493 shaping process Methods 0.000 claims description 26
- 238000004806 packaging method and process Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000001629 suppression Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/508—Pulse generation, e.g. generation of solitons
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention discloses an OTDR device based on multipath optical fiber optical signal monitoring, which comprises a main control unit, an optical transmitting unit, an optical branching unit, an oscillography unit, N coupling units and N optical branching detection units, wherein the main control unit is respectively connected with the optical transmitting unit and the oscillography unit, the optical transmitting unit is connected with the optical branching unit, the optical branching unit is correspondingly connected with the N coupling units, the input end of each coupling unit is respectively correspondingly connected with the optical branching unit and the optical branching detection unit, the output end of each coupling unit is correspondingly connected with an optical fiber to be tested, and each optical branching detection unit is correspondingly connected with the main control unit. The invention has the advantages that: the method can simultaneously monitor, search and locate the fault points of the optical fibers to be tested, and has high test speed and high measurement accuracy.
Description
Technical Field
The invention relates to the field of optical time domain reflection, in particular to an OTDR device based on multipath optical fiber optical signal monitoring.
Background
An Optical Time-domain reflectometer (OTDR) is a precise photoelectric integrated instrument manufactured by utilizing rayleigh scattering and back scattering generated by fresnel reflection when light is transmitted in an Optical fiber, and is widely applied to maintenance and construction of an Optical cable line, and can be used for measuring the length of the Optical fiber, transmission attenuation of the Optical fiber, joint attenuation, fault positioning and the like.
At present, there are two main types of OTDR for optical fiber fault location monitoring: single photon detection OTDR for weak light detection at single photon level and normal OTDR for light detection at non-single photon level; avalanche Photodiodes (APDs) are an indispensable component in OTDR as a photosensitive detection element commonly used in the field of laser communication, and have high detection sensitivity.
Wherein the avalanche photodiode of the single photon detection OTDR works in a gate-controlled geiger mode, and the avalanche photodiode of the common OTDR works in a linear mode; the avalanche photodiode working in the linear mode can work in a continuous signal acquisition state without considering the post-pulse effect, has the advantage of quick measurement time, but the gain of the avalanche photodiode working in the linear mode is low, so that weak and small optical signals cannot be detected, and the measurement precision and the measurement distance of the common OTDR are limited.
Although the single photon detection OTDR can detect very weak light signals smaller than thermal noise, can obtain higher measurement precision, farther measurement distance and larger dynamic range than the common OTDR, and can make up the defects of the common OTDR, the avalanche photodiode of the single photon detection OTDR works in a gating geiger mode and is influenced by rear pulses, has certain dead time, so that the gate pulse repetition frequency of the single photon detector is low and can only work in a point-by-point scanning mode, and longer time is often needed for completing one detection task; when the measurement precision is higher and the number of scanning points is larger, the detection time required by single photon detection OTDR is longer; the greater the post-pulse probability, the longer the dead time that needs to be set for single photon detection OTDR.
In addition, because the avalanche photodiode is a capacitive device, when a gate pulse signal is loaded on the avalanche photodiode to charge and discharge the avalanche photodiode, corresponding noise is introduced, and a photo-generated avalanche effective signal is submerged to influence a detection result; meanwhile, the temperature change can also have a certain influence on the detection performance of the avalanche photodiode, and the instability of the working performance of the avalanche photodiode can be caused, so that the positioning and searching of the optical fiber fault point are inaccurate.
Disclosure of Invention
The invention aims to provide an OTDR device based on multipath optical fiber optical signal monitoring, which is used for solving the defects in the background technology.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides an OTDR device based on multichannel fiber optic signal monitoring, contains master control unit, optical transmission unit, optical branching unit, oscillography unit, N coupling unit and N optical branching detection unit, the master control unit respectively with optical transmission unit and oscillography unit are connected, optical transmission unit with optical branching unit is connected, optical branching unit correspond with N coupling unit is connected, every coupling unit's input corresponds and is connected with optical branching unit and an optical branching detection unit, every coupling unit output corresponds and is connected with an optical fiber to be tested, every optical branching detection unit all corresponds with master control unit is connected.
Further, the main control unit comprises a singlechip, a pulse signal generator, a signal attenuation driver and a data processor, wherein the pulse signal generator, the signal attenuation driver and the data processor are respectively connected with the singlechip;
The optical transmitting unit comprises a pulse light source and an adjustable attenuator, the pulse light source is respectively connected with the pulse signal generator and the adjustable attenuator, and the adjustable attenuator is respectively connected with the signal attenuation driver and the optical branching unit;
Each optical branching detection unit comprises a 1x2 optical splitter, a common detection unit and a single photon detection unit, the input end of each 1x2 optical splitter is correspondingly connected with a coupling unit, and the output end of each 1x2 optical splitter is correspondingly connected with the common detection unit and the single photon detection unit respectively.
Further, the optical branching unit is a 1xN optical splitter; the oscillography unit is a waveform display, and the waveform display comprises N display areas which are correspondingly used for displaying the detected light waveform curve output by the optical branching detection unit; each coupling unit is a directional coupler or a circulator; wherein N is an integer not less than 2.
Further, each common detection unit comprises a first photoelectric detection module, a filter, a first signal amplifier and a first analog-to-digital converter which are sequentially connected, each first photoelectric detection module is correspondingly connected with an output port of a 1x2 optical splitter, each first analog-to-digital converter is correspondingly connected with a data processor of the main control unit, and each first photoelectric detection module comprises a first avalanche photodiode, a first temperature control module and a first packaging box; each first temperature control module comprises a first refrigerator, a first heater and a first temperature sensor, each first refrigerator and each first heater are respectively connected with a singlechip of a main control unit, each first temperature sensor is respectively connected with the singlechip of the main control unit and pins of a first avalanche photodiode, and each first avalanche photodiode, the first refrigerator, the first heater and the first temperature sensor corresponding to the first photoelectric detection module are correspondingly packaged in one first packaging box body.
Further, each single photon detection unit comprises a second photoelectric detection module, a bias module, a clock module, a gate pulse module, a noise suppression module, a pulse shaping module and a photon counter, each bias module is correspondingly connected with a singlechip and a second photoelectric detection module of the main control unit respectively, each clock module is correspondingly connected with a pulse signal generator and a gate pulse module of the main control unit respectively, each gate pulse module is correspondingly connected with the singlechip and the second photoelectric detection module of the main control unit, each noise suppression module is correspondingly connected with the second photoelectric detection module and the pulse shaping module respectively, each photon counter is correspondingly connected with a data processor and the pulse shaping module of the main control unit respectively, each second photoelectric detection module is correspondingly connected with an output port of a 1x2 optical splitter, and each second photoelectric detection module comprises a second avalanche photodiode, a second temperature module and a second packaging box; each second temperature control module comprises a second refrigerator, a second heater and a second temperature sensor, each second refrigerator and each second heater are respectively and correspondingly connected with a singlechip of a main control unit, each second temperature sensor is respectively and correspondingly connected with a singlechip of the main control unit and a pin of a second avalanche photodiode, and each second avalanche photodiode, the second refrigerator, the second heater and the second temperature sensor corresponding to each second photoelectric detection module are respectively and correspondingly packaged in one second packaging box.
Further, each bias module is a voltage source module and is respectively connected with a singlechip of the main control unit and a cathode of a second avalanche photodiode correspondingly; each of the bias modules is configured to provide a reverse bias voltage required for operation of a second avalanche photodiode correspondingly connected thereto.
Further, each gate pulse module is a gate pulse generator, and is correspondingly connected with a clock module and is correspondingly connected with a cathode of a second avalanche photodiode, each gate pulse module comprises a phase-locked loop circuit, a frequency divider and a second signal amplifier, an output end of each phase-locked loop circuit is correspondingly connected with a second signal amplifier, an input end of each phase-locked loop circuit is correspondingly connected with a clock module, and each phase-locked loop circuit comprises a phase discriminator, a loop filter and a voltage-controlled oscillator which are sequentially connected; each gate pulse module is used for outputting a gate control signal, carrying out charge and discharge control on a second avalanche photodiode correspondingly connected with the gate pulse module, realizing avalanche and quenching process control on the second avalanche photodiode, and each clock module is used for controlling the gate pulse module and the pulse signal generator correspondingly connected with the clock module to synchronously trigger the gate pulse module and the pulse signal generator to work, so that the gate control signal output by the gate pulse module and the bias voltage signal output by the bias voltage module are loaded on the second avalanche photodiode in a time sequence mode, and the second avalanche photodiode works in a Geiger gate control mode, thereby realizing single photon level light intensity signal detection.
Further, each noise suppression module comprises a band-pass filter, a low-pass filter and a third signal amplifier; each bandpass filter input end is correspondingly connected with a gate pulse module output end, and each bandpass filter output end is correspondingly connected with the cathode of a second avalanche photodiode; each low-pass filter input end is correspondingly connected with the anode of a second avalanche photodiode, and each low-pass filter output end is correspondingly connected with the input end of a third signal amplifier; the output end of each third signal amplifier is correspondingly connected with a pulse shaping module; each band-pass filter is used for filtering sideband noise and harmonic noise signals brought by the gating signals output by the corresponding gating pulse module; each low-pass filter is used for filtering noise signals which are introduced by the gating signals output by the corresponding gate pulse module and are generated after photoelectric conversion of the corresponding second avalanche photodiode, and effective photo-generated carrier avalanche signals are obtained from the noise signals.
Further, each pulse shaping module comprises a pulse amplitude discriminator, a pulse shaping circuit and a second analog-to-digital converter; each pulse amplitude discriminator input end is correspondingly connected with a third signal amplifier output end, each pulse amplitude discriminator output end is correspondingly connected with a pulse shaping circuit input end, each pulse shaping circuit output end is correspondingly connected with a second analog-to-digital converter input end, each second analog-to-digital converter output end is correspondingly connected with a photon counter input end, and each photon counter output end is correspondingly connected with a data processor of the main control unit.
Compared with the prior art, the invention has the beneficial effects that: the invention can accurately position and search fault points of the multipath optical fibers to be detected, is beneficial to improving the operation, maintenance and overhaul working efficiency of operation and monitoring staff on the optical fiber circuit and reducing the investment of monitoring cost on the optical fiber link, and has the advantages of high working efficiency, accurate measurement result, high monitoring speed and the like.
Drawings
FIG. 1 is a block diagram of an OTDR device based on multi-path optical fiber optical signal monitoring in accordance with the present invention;
FIG. 2 is a block diagram of an embodiment of an OTDR device based on multi-path optical signal monitoring;
Fig. 3 is a block diagram of a structure based on each of the general probe units in fig. 2;
FIG. 4 is a block diagram of a structure based on each single photon detection unit in FIG. 3;
FIG. 5 is a block diagram of a circuit connection based on the gate pulse module of FIG. 4;
In the figure: 1. a main control unit; 11. a single chip microcomputer; 12. a pulse signal generator; 13. a signal attenuation driver; 14. a data processor; 2. an optical transmission unit; 21. a pulsed light source; 22. an adjustable attenuator; 3. an optical branching unit; 4. an oscillometric unit; 5. a coupling unit; 6. an optical branching detection unit; 61. a 1x2 beam splitter; 62. a common detection unit; 621. a first photoelectric detection module; 621a, a first avalanche photodiode; 621b, a first temperature control module; 621b-1, a first refrigerator; 621b-2, a first heater; 621b-3, a first temperature sensor; 621c, a first packaging box; 622. a filter; 623. a first signal amplifier; 624. a first analog-to-digital converter; 63. a single photon detection unit; 631. a second photoelectric detection module; 631a, a second avalanche photodiode; 631b, a second temperature control module; 631b-1, a second refrigerator; 631b-2, a second heater; 631b-3, a second temperature sensor; 631c, a second enclosure; 632. a bias module; 633. a clock module; 634. a gate pulse module; 634a, a phase-locked loop circuit; 634b, frequency dividers; 634c, a second signal amplifier; 635. a noise suppression module; 635a, a bandpass filter; 635b, a low pass filter; 635c, a third signal amplifier; 636. a pulse shaping module; 636a, pulse discriminator; 636b, pulse shaping circuitry; 636c, a second analog-to-digital converter; 637. a photon counter; 7. and the optical fiber to be tested.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the present invention easy to understand, the following further describes how the present invention is implemented with reference to the accompanying drawings and the specific embodiments.
As shown in fig. 1, the OTDR device based on multi-path optical fiber optical signal monitoring provided by the invention comprises a main control unit 1, an optical transmitting unit 2, an optical branching unit 3, an oscillometric unit 4, N coupling units 5 and N optical branching detection units 6; the main control unit 1 is respectively connected with the optical transmission unit 2 and the oscillometric unit 4; the optical transmitting unit 2 is connected with the optical branching unit 3, the optical branching unit 3 is correspondingly connected with N coupling units 5, the input end of each coupling unit 5 is correspondingly connected with one output end of the optical branching unit 3 and an optical branching detection unit 6, and the output end of each coupling unit 5 is correspondingly connected with an optical fiber 7 to be tested; each optical branching detection unit 6 is correspondingly connected with the main control unit 1.
As shown in fig. 2, in the present embodiment, the main control unit 1 includes a single chip microcomputer 11, a pulse signal generator 12, a signal attenuation driver 13 and a data processor 14, wherein the pulse signal generator 12, the signal attenuation driver 13 and the data processor 14 are respectively connected with the single chip microcomputer 11;
The optical transmitting unit 2 comprises a pulse light source 21 and an adjustable attenuator 22, the pulse light source 21 is respectively connected with the pulse signal generator 12 and the adjustable attenuator 22, and the adjustable attenuator 22 is respectively connected with the signal attenuation driver 13 and the optical branching unit 3; the pulse light source 21 emits high-speed near infrared light with 1550nm wave band, and the optical branching unit 3 is a 1xN optical splitter;
The oscillography unit 4 is a waveform display, and N display areas corresponding to the detected light waveform curves output by the display optical branching detection unit 6 are arranged on the waveform display;
Each coupling unit 5 is an orientation coupler or a circulator;
Each optical branching detection unit 6 includes a 1x2 beam splitter 61, a normal detection unit 62, and a single photon detection unit 63.
Wherein N is an integer greater than or equal to 2, and N is set to be equal to 4 as the best according to the common viewing window viewing habit.
As shown in fig. 3, each of the normal detection units 62 includes a first photoelectric detection module 621, a filter 622, a first signal amplifier 623, and a first analog-to-digital converter 624 connected in sequence, wherein an input end of each of the first photoelectric detection modules 621 is correspondingly connected to an output port of a 1x2 optical splitter 61, and each of the first analog-to-digital converters 624 is correspondingly connected to the data processor 14 of the main control unit 1;
Each first photoelectric detection module 621 comprises a first avalanche photodiode 621a, a first temperature control module 621b and a first packaging box 621c, each first temperature control module 621b comprises a first refrigerator 621b-1, a first heater 621b-2 and a first temperature sensor 621b-3, each first refrigerator 621b-1 and each first heater 621b-2 are respectively connected with the singlechip 11 of the main control unit 1, each first temperature sensor 621b-3 is respectively connected with the singlechip 11 of the main control unit 1 and a pin of the first avalanche photodiode 621a, each first avalanche photodiode 621a, the first refrigerator 621b-1, the first heater 621b-2 and the first temperature sensor 621b-3 corresponding to each first photoelectric detection module 621 are respectively packaged in one first packaging box 621c, each first temperature control module 621b adjusts the temperature in the corresponding first packaging box 621c through the first refrigerator 621b-1 and the first heater 621b-2, and feeds back the sensed working temperature of the first avalanche photodiode 621a to the singlechip 11 of the main control unit 1 in real time through the first temperature sensor 621b-3 packaged in the corresponding first packaging box 621c, and controls the first refrigerator 621b-1 and the first heater 621b-2 to realize refrigeration or heating control through the singlechip 11, so that the temperature in the first packaging box 621c is regulated and controlled, the first avalanche photodiode 621a is at a proper working temperature at any moment, and the unstable performance of the first avalanche photodiode 621a caused by temperature increase is effectively avoided, and the accuracy of the light intensity signal detection result of the common detection unit is influenced.
As shown in fig. 4, each single photon detection unit 63 includes a second photo detection module 631, a bias module 632, a clock module 633, a gate pulse module 634, a noise suppression module 635, a pulse shaping module 636, and a photon counter 637;
The input end of each bias module 632 is correspondingly connected with the singlechip 11 of the main control unit 1, the output end of each bias module 632 is correspondingly connected with the input end of a second photoelectric detection module 631, the input end of each second photoelectric detection module 631 is correspondingly connected with an output port of a 1x2 optical splitter 61 and the output end of a gate pulse module 634 respectively, the other output port of each 1x2 optical splitter 61 is correspondingly connected with the input end of a first photoelectric detection module 621, the output end of each second photoelectric detection module 631 is correspondingly provided with a noise suppression module 635, a pulse shaping module 636 and a photon counter 637 which are sequentially connected, and the input end of each gate pulse module 634 is correspondingly connected with the singlechip 11 of the main control unit 1 and a clock module 633 respectively; each clock module 633 is correspondingly connected with the pulse signal generator 12 and the singlechip 11 of the main control unit 1, and each photon counter 637 is correspondingly connected with the data processor 14 of the main control unit 1;
Each second photo-detection module 631 comprises a second avalanche photodiode 631a, a second temperature control module 631b and a second packaging box 631c; each second temperature control module 631b comprises a second refrigerator 631b-1, a second heater 631b-2 and a second temperature sensor 631b-3, each second refrigerator 631b-1 and second heater 631b-2 are respectively connected with the singlechip 11 of the main control unit 1, each second temperature sensor 631b-3 is respectively connected with the singlechip 11 of the main control unit 1 and the pin of a second avalanche photodiode 631a, each second avalanche photodiode 631a, the second refrigerator 631b-1, the second heater 631b-2 and the second temperature sensor 631b-3 corresponding to each second photoelectric detection module 631 are respectively packaged in a second packaging box 631c, each second temperature control module 631b adjusts the temperature in the corresponding second packaging box 631c through the second refrigerator 631b-1 and the second heater 631b-2, and feeds back the sensed working temperature of the second avalanche photodiode 631a to the singlechip 11 of the main control unit 1 in real time through the first temperature sensor 631b-3 packaged in the corresponding second packaging box 631c, and controls the second refrigerator 631b-1 and the second heater 631b-2 to realize the refrigeration or heating control of the singlechip 11, so that the temperature in the first packaging box 621c is regulated and controlled, the second avalanche photodiode 631a is at a proper working temperature at any moment, and the unstable performance of the second avalanche photodiode 631a caused by the temperature increase is effectively avoided, and the accuracy of the light intensity signal detection result of the single photon detection unit is influenced.
Each bias module 632 is a voltage source module and is respectively connected with the singlechip 11 of the main control unit 1 and the cathode of a second avalanche photodiode 631 a; each bias module 632 is configured to provide the reverse bias voltage required for operation of the corresponding connected second avalanche photodiode 631 a.
Each gate pulse module 634 is a gate pulse generator and is correspondingly connected with a clock module 633 and a bias module 632, as shown in fig. 5, each gate pulse module 634 includes a phase-locked loop circuit 634a, a frequency divider 634b and a second signal amplifier 634c, an output end of each phase-locked loop circuit 634a is correspondingly connected with a second signal amplifier 634c, an input end of each phase-locked loop circuit 634a is correspondingly connected with a clock module 633, and each phase-locked loop circuit 634a includes a phase detector 634a-1, a loop filter 634a-2 and a voltage-controlled oscillator 634a-3 which are sequentially connected; each gate pulse module 634 is used for outputting a gate control signal to perform charge and discharge control on the bias module 632 correspondingly connected with the gate control signal, so as to generate reverse bias voltage loaded on the second avalanche photodiode 631a, and realize avalanche and quenching process control on the second avalanche photodiode 631 a;
When the reverse bias voltage generated by the bias module 632 is applied to the second avalanche photodiode 631a and is greater than or equal to the avalanche voltage of the second avalanche photodiode 631a, the returned photons from the optical fiber 7 to be tested, which are subjected to the rayleigh scattering and the fresnel reflection, will be incident into the second avalanche photodiode 631a to generate a large number of photo-generated carriers, that is, form an avalanche signal;
when the reverse bias voltage generated by the bias module 632 is applied to the second avalanche photodiode 631a and is smaller than the avalanche voltage of the second avalanche photodiode 631a, then the returned photons from the optical fiber 7 to be measured, which are subjected to the rayleigh scattering and fresnel reflection, are insufficient to generate photogenerated carriers, that is, the second avalanche photodiode 63a is quenched;
Each clock module 633 is configured to control the gate pulse module 634 and the pulse signal generator 12 correspondingly connected to the clock module to trigger synchronously, so that the gate control signal output by the gate pulse module 634 and the pulse light signal sent by the pulse signal generator 12 are loaded onto the second avalanche photodiode 631a in a clock manner, and the second avalanche photodiode 631a is operated in the geiger gate control mode, thereby realizing detection of the light intensity signal of the single photon level.
Each noise suppression module 635 includes a bandpass filter 635a, a lowpass filter 635b, and a third signal amplifier 635c; the input end of each band-pass filter 635a is correspondingly connected with the output end of a gate pulse module 634, and the output end of each band-pass filter 635a is correspondingly connected with the cathode of a second avalanche photodiode 631 a; the input end of each low-pass filter 635b is correspondingly connected with the anode of a second avalanche photodiode 631a, and the output end of each low-pass filter 635b is correspondingly connected with the input end of a third signal amplifier 635c; the output end of each third signal amplifier 635c is correspondingly connected with a pulse shaping module 636;
each bandpass filter 635a is configured to filter out sideband noise and harmonic noise signals caused by the gating signal output by the corresponding gating module 634;
Each low pass filter 635b is configured to filter out a noise signal introduced by the gating signal output by the corresponding gate pulse module 634 and generated after photoelectric conversion by the corresponding second avalanche photodiode 631a, and obtain an effective photo-generated carrier avalanche signal therefrom.
Each pulse shaping module 636 includes a pulse discriminator 636a, a pulse shaping circuit 636b, and a second analog-to-digital converter 636c; the input end of each pulse discriminator 636a is correspondingly connected with the output end of a third signal amplifier 636c, the output end of each pulse discriminator 636a is correspondingly connected with the input end of a pulse shaping circuit 636b, the output end of each pulse shaping circuit 636b is correspondingly connected with the input end of a second analog-to-digital converter 636c, the output end of each second analog-to-digital converter 636c is correspondingly connected with the input end of a photon counter 637, and the output end of each photon counter 637 is correspondingly connected with the data processor 14 of the main control unit 1.
Each pulse shaping module 636 is configured to shape and convert the obtained effective avalanche analog signal into a standard digital signal, and output the standard digital signal to the digital processor 14 of the main control unit, and after the digital processor 14 analyzes and processes the signal, the corresponding OTDR detection optical waveform signal is displayed at a corresponding display area on the waveform display.
In the present embodiment, the first avalanche photodiode 621a and the second avalanche photodiode 631a are InGaAs or InP avalanche photodiodes.
Finally, the foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the invention.
Claims (5)
1. An OTDR device based on multichannel optical fiber optical signal monitoring, its characterized in that: the optical fiber sensor comprises a main control unit (1), an optical transmission unit (2), an optical branching unit (3), an oscillography unit (4), N coupling units (5) and N optical branching detection units (6), wherein the main control unit (1) is respectively connected with the optical transmission unit (2) and the oscillography unit (4), the optical transmission unit (2) is connected with the optical branching unit (3), the optical branching unit (3) is correspondingly connected with the N coupling units (5), the input end of each coupling unit (5) is correspondingly connected with the optical branching unit (3) and one optical branching detection unit (6), the output end of each coupling unit (5) is correspondingly connected with an optical fiber to be measured (7), and each optical branching detection unit (6) is correspondingly connected with the main control unit (1).
The main control unit (1) comprises a single chip microcomputer (11), a pulse signal generator (12), a signal attenuation driver (13) and a data processor (14), wherein the pulse signal generator (12), the signal attenuation driver (13) and the data processor (14) are respectively connected with the single chip microcomputer (11);
The optical transmission unit (2) comprises a pulse light source (21) and an adjustable attenuator (22), the pulse light source (21) is respectively connected with the pulse signal generator (12) and the adjustable attenuator (22), and the adjustable attenuator (22) is respectively connected with the signal attenuation driver (13) and the optical branching unit (3);
Each optical branching detection unit (6) comprises a 1x2 optical splitter (61), a common detection unit (62) and a single photon detection unit (63), the input end of each 1x2 optical splitter (61) is correspondingly connected with a coupling unit (5), and the output end of each 1x2 optical splitter (61) is correspondingly connected with the common detection unit (62) and the single photon detection unit (63);
Each common detection unit (62) comprises a first photoelectric detection module (621), a filter (622), a first signal amplifier (623) and a first analog-to-digital converter (624) which are sequentially connected, each first photoelectric detection module (621) is correspondingly connected with an output port of a 1x2 optical splitter (61), each first analog-to-digital converter (624) is correspondingly connected with a data processor (14) of the main control unit (1), and each first photoelectric detection module (621) comprises a first avalanche photodiode (621 a), a first temperature control module (621 b) and a first packaging box (621 c); each first temperature control module (621 b) comprises a first refrigerator (621 b-1), a first heater (621 b-2) and a first temperature sensor (621 b-3), each first refrigerator (621 b-1) and each first heater (621 b-2) are respectively connected with a singlechip (11) of the main control unit (1), each first temperature sensor (621 b-3) is respectively connected with pins of the singlechip (11) of the main control unit (1) and a first avalanche photodiode (621 a), and each first avalanche photodiode (621 a), the first refrigerator (621 b-1), the first heater (621 b-2) and the first temperature sensor (621 b-3) corresponding to each first photoelectric detection module (621) are correspondingly packaged in one first package body (621 c);
Each single photon detection unit (63) comprises a second photoelectric detection module (631), a bias module (632), a clock module (633), a door pulse module (634), a noise suppression module (635), a pulse shaping module (636) and a photon counter (637), each bias module (632) is respectively and correspondingly connected with a singlechip (11) and a second photoelectric detection module (631) of the main control unit (1), each clock module (633) is respectively and correspondingly connected with a pulse signal generator (12) and a door pulse module (634) of the main control unit (1), each door pulse module (634) is respectively and correspondingly connected with the singlechip (11) and the second photoelectric detection module (631) of the main control unit (1), each noise suppression module (635) is respectively and correspondingly connected with a second photoelectric detection module (631) and a pulse shaping module (636), each photon counter (637) is respectively and correspondingly connected with a data processor (14) and a pulse shaping module (636) of the main control unit (1), each second photoelectric detection module (631) is respectively and correspondingly connected with a second photoelectric detection module (631) of the main control unit (1), each second photoelectric detection module (631) is respectively and is respectively connected with a second photoelectric detection module (631) and each photoelectric detection module (631) is respectively and correspondingly connected with a second photoelectric detection module (631) and each photoelectric detection module (61) is respectively and respectively, A second temperature control module (631 b) and a second packaging box (631 c); each second temperature control module (631 b) comprises a second refrigerator (631 b-1), a second heater (631 b-2) and a second temperature sensor (631 b-3), each second refrigerator (631 b-1) and each second heater (631 b-2) are respectively connected with the singlechip (11) of the main control unit (1), each second temperature sensor (631 b-3) is respectively connected with the singlechip (11) of the main control unit (1) and a pin of a second avalanche photodiode (631 a), and each second avalanche photodiode (631 a), the second refrigerator (631 b-1), the second heater (631 b-2) and the second temperature sensor (631 b-3) corresponding to each second photoelectric detection module (631) are respectively packaged in one second packaging box (631 c);
Each of the noise suppression modules (635) includes a band pass filter (635 a), a low pass filter (635 b), and a third signal amplifier (635 c); the input end of each band-pass filter (635 a) is correspondingly connected with the output end of a gate pulse module (634), and the output end of each band-pass filter (635 a) is correspondingly connected with the cathode of a second avalanche photodiode (631 a); the input end of each low-pass filter (635 b) is correspondingly connected with the anode of a second avalanche photodiode (631 a), and the output end of each low-pass filter (635 b) is correspondingly connected with the input end of a third signal amplifier (635 c); the output end of each third signal amplifier (635 c) is correspondingly connected with a pulse shaping module (636);
Each bandpass filter (635 a) is configured to filter out sideband noise and harmonic noise signals from the gating signal output by the corresponding gating module (634);
Each low pass filter 635b is configured to filter noise signals introduced by the gating signal output by the corresponding gate pulse module 634 and generated after photoelectric conversion by the corresponding second avalanche photodiode 631a, and obtain effective photo-generated carrier avalanche signals therefrom.
2. The OTDR device based on multipath optical signal monitoring as claimed in claim 1, wherein: the optical branching unit (3) is a 1xN optical splitter, the oscillography unit (4) is a waveform display, and the waveform display comprises N waveform curve display areas; each coupling unit (5) is a directional coupler or circulator; wherein N is an integer not less than 2.
3. The OTDR device based on multipath optical signal monitoring as claimed in claim 1, wherein: each bias module (632) is a voltage source module and is respectively connected with the singlechip (11) of the main control unit (1) and the cathode of a second avalanche photodiode (631 a).
4. The OTDR device based on multipath optical signal monitoring as claimed in claim 1, wherein: each gate pulse module (634) is a gate pulse generator, and is respectively connected with a clock module (633) and a cathode of a second avalanche photodiode (631 a), each gate pulse module (634) comprises a phase-locked loop circuit (634 a), a frequency divider (634 b) and a second signal amplifier (634 c), an output end of each phase-locked loop circuit (634 a) is correspondingly connected with a second signal amplifier (634 c), an input end of each phase-locked loop circuit (634 a) is correspondingly connected with a clock module (633), and each phase-locked loop circuit (634 a) comprises a phase detector (634 a-1), a loop filter (634 a-2) and a voltage-controlled oscillator (634 a-3) which are sequentially connected.
5. The OTDR device based on multipath optical signal monitoring as claimed in claim 1, wherein: each pulse shaping module (636) comprises a pulse amplitude detector (636 a), a pulse shaping circuit (636 b), and a second analog-to-digital converter (636 c); each pulse discriminator (636 a) input is correspondingly connected with the output end of a third signal amplifier (635 c), each pulse discriminator (636 a) output is correspondingly connected with the input end of a pulse shaping circuit (636 b), each pulse shaping circuit (636 b) output is correspondingly connected with the input end of a second analog-to-digital converter (636 c), each second analog-to-digital converter (636 c) output is correspondingly connected with the input end of a photon counter (637), and each photon counter (637) output is correspondingly connected with the data processor (14) of the main control unit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711355335.5A CN108075828B (en) | 2017-12-16 | 2017-12-16 | OTDR device based on multichannel optical fiber optical signal monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711355335.5A CN108075828B (en) | 2017-12-16 | 2017-12-16 | OTDR device based on multichannel optical fiber optical signal monitoring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108075828A CN108075828A (en) | 2018-05-25 |
| CN108075828B true CN108075828B (en) | 2024-08-23 |
Family
ID=62158771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711355335.5A Active CN108075828B (en) | 2017-12-16 | 2017-12-16 | OTDR device based on multichannel optical fiber optical signal monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108075828B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347544B (en) * | 2018-07-26 | 2021-12-07 | 传周半导体科技(上海)有限公司 | Optical fiber time domain reflectometer based on ultra-low noise near-infrared single photon detection system |
| CN109831248A (en) * | 2019-03-01 | 2019-05-31 | 成都成电光信科技股份有限公司 | The synthesis optical fiber inspection device and method of integrated FC optical fiber link and Network Check |
| CN110149144A (en) * | 2019-04-09 | 2019-08-20 | 珠海市亿鸿通信工程有限公司 | A kind of optical fiber multibreak intelligent detecting method and its system |
| TWI759213B (en) * | 2020-07-10 | 2022-03-21 | 大陸商廣州印芯半導體技術有限公司 | Light sensor and sensing method thereof |
| CN113945362B (en) * | 2021-09-01 | 2024-10-29 | 国网安徽省电力有限公司亳州供电公司 | Optical fiber testing system for optimizing light source for power station |
| CN115166916A (en) * | 2022-05-06 | 2022-10-11 | 盛纬伦(深圳)通信技术有限公司 | Temperature self-adaptive shunt |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201854282U (en) * | 2010-12-02 | 2011-06-01 | 桂林光通电子工程公司 | Online monitoring device for multichannel optical fibers based on power partition and OTDR |
| CN106130626A (en) * | 2016-08-19 | 2016-11-16 | 浙江神州量子网络科技有限公司 | A kind of optical time domain reflectometer and optical fiber test method |
| CN207720138U (en) * | 2017-12-16 | 2018-08-10 | 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545890A (en) * | 2010-12-15 | 2012-07-04 | 浦勇 | Phase-locked loop |
| US9964464B2 (en) * | 2012-04-11 | 2018-05-08 | Ultra Communications, Inc. | Optical time domain reflectometer with high resolution and high sensitivity |
| CN103323215B (en) * | 2013-05-20 | 2015-11-25 | 中国电子科技集团公司第四十一研究所 | A kind of light time domain reflection measuring apparatus and method |
| CN104485990A (en) * | 2014-12-02 | 2015-04-01 | 国家电网公司 | Multi-path fiber core test device and method |
| CN107167251B (en) * | 2017-07-28 | 2023-08-11 | 中国航空工业集团公司洛阳电光设备研究所 | Single photon detector based on high-frequency sine gate pulse mode |
-
2017
- 2017-12-16 CN CN201711355335.5A patent/CN108075828B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201854282U (en) * | 2010-12-02 | 2011-06-01 | 桂林光通电子工程公司 | Online monitoring device for multichannel optical fibers based on power partition and OTDR |
| CN106130626A (en) * | 2016-08-19 | 2016-11-16 | 浙江神州量子网络科技有限公司 | A kind of optical time domain reflectometer and optical fiber test method |
| CN207720138U (en) * | 2017-12-16 | 2018-08-10 | 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 |
Non-Patent Citations (1)
| Title |
|---|
| 基于光子计数调制的光学时域反射;臧鹏程;《光电工程》;20100331;第1-2页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108075828A (en) | 2018-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108075828B (en) | OTDR device based on multichannel optical fiber optical signal monitoring | |
| CN104075802B (en) | A kind of photon counting-type faint optical signal measurement mechanism of high dynamic range and method | |
| CN102435582B (en) | High precision laser absorptivity measuring device | |
| CN103344614B (en) | A kind of atmospheric transmissivity at high precision measurement mechanism and measuring method | |
| CN108801153B (en) | Optical fiber length measuring method and measuring device | |
| CN104819773B (en) | The test device and method of narrow spaces peak laser luminous power continuously | |
| CN101839698A (en) | BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and calibrating method thereof | |
| CN107356914B (en) | Calibration system for satellite-borne laser radar detector | |
| CN102393247B (en) | Calibration apparatus for laser micro energy | |
| CN109347544B (en) | Optical fiber time domain reflectometer based on ultra-low noise near-infrared single photon detection system | |
| CN107870080B (en) | Time delay measurement device and method for image fusion system | |
| CN207720138U (en) | A kind of OTDR devices based on multi-channel optical fibre optical monitoring signal | |
| CN209419624U (en) | A kind of optical time domain reflectometer based on orthogonal modulation technique | |
| CN105136429B (en) | A kind of signal supervisory instrument and method for improving optical time domain reflectometer dynamic range | |
| CN102053009B (en) | Method for measuring response time of photoelectric measurement instrument | |
| CN102628947A (en) | Atmospheric ozone profile Raman-Rayleigh/Lamy laser radar measuring device and detection method | |
| CN103616674A (en) | Method for measuring optimal local oscillation optical power of photoelectric detector | |
| CN203572631U (en) | Optical time-domain reflectometer based on superconducting nanowire single-photon detector | |
| CN102426306B (en) | Ultrafast electronic device test system and method thereof | |
| CN107515389B (en) | High-precision calibration system for satellite-borne laser radar detector | |
| Ripamonti et al. | No dead-space optical time-domain reflectometer | |
| CN213455339U (en) | Device for measuring optical fiber length | |
| Golovkov et al. | Receiving system of a pulsed laser rangefinder | |
| CN209559469U (en) | Distribution type fiber-optic loss measurement system based on Raman scattering | |
| CN202583462U (en) | Atmospheric ozone profile Raman-Rayleigh/M laser radar measurement device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |