CN103532616A - Integrative optical cable fault detection device - Google Patents
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- CN103532616A CN103532616A CN201310470926.2A CN201310470926A CN103532616A CN 103532616 A CN103532616 A CN 103532616A CN 201310470926 A CN201310470926 A CN 201310470926A CN 103532616 A CN103532616 A CN 103532616A
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Abstract
The invention provides an integrative optical cable fault detection device, which comprises an optical time-domain reflectometer, a red light source laser, an optical power detector, a single-end type Sagnac interference optical cable identification instrument, three 1*2 matrix optical switches used for function switching, a multiplexing optical switch and four signal lines used for controlling the four optical switches. The integrative optical cable fault detection device disclosed by the invention combines an optical time-domain reflectometer fault positioning function, a red light source visual fault positioning function, an optical power meter measurement function and an optical cable identification function into a whole, and the portable high-integration optical cable fault detection device characterized in single-port output can be used for quickly diagnosing the optical cable fault.
Description
Technical field
The present invention relates to detection technique field, particularly a kind of integrated optical cable failure detector.
Background technology
In the optical cable maintenance and logistics support of Networks of Fiber Communications, along with the complexity day by day of Networks of Fiber Communications circuit, increased the weight of the workload of optical cable maintenance and guarantee, therefore safeguard that Diagnostic Time becomes the major criterion of weighing Cable's Fault tester.The optical cable identification that existing measuring technology mainly comprises optical time domain reflectometer (OTDR), visual ruddiness fault location, optical channel power measurement and interferes based on Sagnac.
The optical cable identifier of interfering based on Sagnac is to utilize white light interference principle identical along light path clockwise and transmission counterclockwise and that form, by detecting light intensity, change and perception optical cable vibration information, utilize this technology can realize the identification of optical cable in complicated lightguide cable link, accurately find out the corresponding relation of input optical fibre and output optical fibre in optical cable.Figure 1 shows that the optical cable identifier that monofocal Sagnac interferes, comprise optical cable identification laser 10, photodetector 30,3 * 3 couplers 11 and fibre optic isolater 12.The continuous light that optical cable identification laser 10 produces enters 3 * 3 coupler 11 from the second port 2, light is divided into 2 tunnels: light path one 2 → 5 → 6 → 5 → 1 → 4 → 3 and light path 22 → 4 → 1 → 5 → 6 → 5 → 3 equivalent optical paths, and be all 3 times through 3 * 3 couplers, so equivalent optical path, the amplitude of two-way light are identical, just compare with light path one, light path two receive disturbance time delays τ, in order to make two-way light form stable interference, require light source to send continuous laser, and require optical cable identification laser optical spectral width large, thereby effectively suppress noise.The output voltage signal that obtains the interference light intensity in the range of linearity after Constant Direct Current item wherein of photodetector conversion filtering and high-order alternation item is:
In formula, n is optical fibre refractivity, the responsiveness that R is photodetector, and RL is load resistance, K is the stress of fiber optic materials and the proportionality coefficient of fiber lengths rate of change, and ξ is fiber strain coefficient, and L is time delay optical fiber length, c is vacuum light speed, and λ is vacuum optical source wavelength, P
ofor incident optical power, p is applied to the stress that the vibration in tested optical fiber causes.
for two ways of optical signals because of the proper phase that 3 * 3 couplers cause poor,
by formula (1), can be found out, when having vibration to be applied to tested optical fiber, will cause that tested voltage changes, thereby realize the identification to fault optical cable.
As shown in Figure 2, optical time domain reflectometer comprises that optical cable seeks barrier laser 20, wavelength division multiplexer 26, fiber optical circulator 27 and photodetector 30, and wherein, optical cable is sought barrier laser 20 and comprised 1310 pulse lasers 24 and 1550 pulse lasers 25.Optical time domain reflectometer injects tested optical fiber by ultrashort light pulse, by measuring the accurate location that Rayleigh scattering light is realized fiber failure dorsad, utilize trigger source to pulse laser and avalanche photodide, to send triggering signal simultaneously, when light pulse is injected after tested optical fiber, each position in optical fiber is produced to the Rayleigh scattering light relevant to this position, therefore the light intensity by each position reflected light electric explorer of detection fiber be distinguishablely whether rupture, the fault such as bending; The asynchronism(-nization) of simultaneously buying property Rayleigh scattering light back light electric explorer 30 raw due to everybody, can obtain the accurate location of each point by calculating return time, position calculation formula is
wherein c/n is the propagation velocity of light in optical fiber, and Δ t is from triggering signal to the time difference of detecting certain position scattered light.
Visual ruddiness fault location is to utilize the visible laser source of 650nm to inject tested optical fiber, and in the fiber position breaking down, visible red can be leaked in a large number, so human eye can directly observe fault point, very effective in short range cable fault detect.
Optical channel power measurement is the ancillary method of Cable's Fault diagnosis, by injecting laser at optical fiber transmitting terminal, judges the break-make of optical-fibre channel at optical fiber connector detection of optical power.
Optical time domain reflectometer can only be realized the location of fiber failure point, but cannot from numerous fibre circuits, accurately find out fault optical fiber, must be aided with optical cable identifier and carry out optical cable maintenance; Visual ruddiness fault location, because loss in optical fiber is larger, can only be diagnosed short distance fibre circuit; Optical channel power measurement can be measured fault optical fiber, but need to measure one by one, and diagnosis amount is heavy.
Instrument majority for optical cable maintenance test only has single function at present, as light source, light power meter, optical time domain reflectometer, optical cable identifier etc., separate unit instrument can not complete the multifunctional testing to optical cable, and the test macro being comprised of multiple tester is bulky, complicated operation, carry extremely inconveniently etc., can not meet the demand of optical cable maintenance in modern Networks of Fiber Communications system.
Summary of the invention
For addressing the above problem, the present invention proposes a kind of integrated optical cable failure detector, light harvesting domain reflectometer Cable's Fault positioning function, the visual fault location function of red light source, light power meter measurement function and optical cable recognition function are in one, portable, Highgrade integration, and the Cable's Fault checkout gear of single port output, can quick diagnosis Cable's Fault.
Technical scheme of the present invention is achieved in that
A kind of integrated optical cable failure detector, comprise: the optical cable identifier that optical time domain reflectometer, red light source laser, optical power detector and monofocal Sagnac interfere, also comprises that 31 * 2 matrix optical switch switching for function, multiplexed optical switch and four are for controlling the holding wire of described 4 optical switches;
The optical cable identifier that monofocal Sagnac interferes comprises optical cable identification laser, photodetector, 3 * 3 couplers and fibre optic isolater;
Optical time domain reflectometer comprises that optical cable seeks barrier laser, wavelength division multiplexer, fiber optical circulator and photodetector;
The first input end of the first optical switch is connected to the output of the second optical switch, and its second input is connected to the output of the 3rd optical switch, and its output is connected to tested optical fiber;
The first input end of the second optical switch is connected to the output of red light source laser, and its second input is connected to the five-port of 3 * 3 couplers of monofocal Sagnac optical interference circuit, and its output is connected to the first input end of the first optical switch;
The first input end of the 3rd optical switch is connected to the first output of the optical fiber circulator of optical time domain reflectometer, and its first output is connected to the second input of the first optical switch, and its second output is connected to the input of optical power detector;
The first input end of the 4th optical switch is connected to the second output of fiber optical circulator, and its second input is connected to the 3rd port of 3 * 3 couplers, and its output is connected to the input of photodetector;
Wherein first signal line (D1) is connected with the first input end of the first optical switch, the first input end of the second optical switch; Secondary signal line (D2) is connected with the second input of the second optical switch, the second input of the 4th optical switch; The 3rd holding wire (D3) is connected with first input end, the 4th optical switch first input end of the 3rd optical switch; The 4th holding wire (D4) is connected with the second input of the first optical switch, the second output of the 3rd optical switch.
Alternatively, described four holding wire D1D2D3D4=1000, the output signal of red light source laser is transferred to tested optical fiber.
Alternatively, described four holding wire D1D2D3D4=1000, after be set to D1D2D3D4=0100, the five-port of described 3 * 3 couplers is connected with tested optical fiber, the 3rd port of 3 * 3 couplers is connected with photodetector.
Alternatively, described four holding wire D1D2D3D4=0001, optical power detector output is connected to tested optical fiber.
Alternatively, described four holding wire D1D2D3D4=0001, after be set to D1D2D3D4=0010, the first output of fiber optical circulator is connected to optical power detector, the first output of fiber optical circulator is connected to tested optical fiber, and the second output of fiber optical circulator is connected to photodetector.
Alternatively, described red light source laser is 650nm red light source laser.
Alternatively, optical power detector is PIN near infrared photodetector.
The invention has the beneficial effects as follows: integrated optical cable failure detector, light harvesting domain reflectometer Cable's Fault positioning function, the visual fault location function of red light source, light power meter measurement function and optical cable recognition function are in one, portable, Highgrade integration, and the Cable's Fault checkout gear of single port output, can quick diagnosis Cable's Fault.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the optical cable identifier of monofocal Sagnac interference;
Fig. 2 is the structural representation of optical time domain reflectometer;
Fig. 3 is the structural representation of integrated optical cable failure detector of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The instrumental function detecting for Cable's Fault is at present single, failure diagnosis length consuming time, and carry inconvenience by the test macro existence of the discrete configuration of instruments such as optical time domain reflectometer, red light source VFL, light power meter, optical cable identifier, complicated operation, the problem that Cable's Fault diagnosis efficiency is low.The present invention is directed to the shortcoming and defect of prior art, a kind of integrated optical cable failure detector is proposed, light harvesting domain reflectometer Cable's Fault positioning function, the visual fault location function of red light source, light power meter measurement function and optical cable recognition function are in one, portable, Highgrade integration, and the Cable's Fault checkout gear of single port output, can quick diagnosis Cable's Fault.
Integrated optical cable failure detector of the present invention comprises the optical cable identifier that optical time domain reflectometer, red light source laser, optical power detector and monofocal Sagnac interfere.Optical time domain reflectometer is realized searching and locating of fiber failure, red light source laser is realized the visual location of fiber failure, optical power detector is realized the measurement of optical fiber cables power, the optical cable identifier that monofocal Sagnac interferes is realized the identification of fault optical cable, and 31 * 2 matrix optical switch are realized the flexible switching between the function of fiber failure location, visual ruddiness location, measuring light power, fault optical cable identifying.
Below in conjunction with Fig. 3, integrated optical cable failure detector of the present invention is described in detail.
The first input end P1 of the first optical switch 100 is connected to the output P0 of the second optical switch 200, and its second input P10 is connected to the output P0 of the 3rd optical switch 300, and its output P0 is connected to tested optical fiber; The first input end P1 of the second optical switch 200 is connected to the output of red light source laser 40, its second input P10 is connected to the five-port 5 of 3 * 3 couplers 11 of the optical cable identifier that monofocal Sagnac interferes, and its output is connected to the first input end P1 of the first optical switch 100; The first input end of the 3rd optical switch 300 is connected to the first output 22 of the optical fiber circulator 27 of optical time domain reflectometer, its first output P0 is connected to the second input P10 of the first optical switch 100, and its second output P10 is connected to the input of optical power detector 50; The first input end P1 of the 4th optical switch 400 is connected to the second output 23 of fiber optical circulator 27, and its second input P10 is connected to the 3rd port 3 of 3 * 3 couplers 11, and its output P0 is connected to the input of photodetector 30.
Adopt D1, D2, D3, tetra-control signal wires of D4 to realize the flexible switching between fiber failure location, visual ruddiness location, measuring light power, fault optical cable recognition function, wherein first signal line D1 is connected with the first input end P1 of the first optical switch 100, the first input end P1 of the second optical switch 200; Secondary signal line D2 is connected with the second input P10 of the second optical switch 200, the second input P10 of the 4th optical switch 400; The 3rd holding wire D3 is connected with first input end P1, the 4th optical switch 400 first input end P1 of the 3rd optical switch 300; The 4th holding wire D4 is connected with the second input P10 of the first optical switch 100, the second output P10 of the 3rd optical switch 300.Adopt signal 1 to represent enable signal, signal 0 represents shutdown signal, and the control sequential of fiber failure location, visual ruddiness location, measuring light power, fault optical cable recognition function is as follows:
The visual fault location of red light source: D1D2D3D4=1000, first signal line D1 enables the first input end P1 of the first input end P1 of the first optical switch 100 and the second optical switch 200, and the output signal of red light source laser 40 is transferred to tested optical fiber.
Fault optical cable identification: be first set to: D1D2D3D4=1000, after be set to: D1D2D3D4=0100, the five-port 5 that is about to 3 * 3 couplers is connected with tested optical fiber, and the 3rd port 3 of 3 * 3 couplers is connected with photodetector 30.
Light power meter measurement function: D1D2D3D4=0001, the 4th holding wire D4 enables the second input P10 of the second input P10 of the first optical switch 100 and the 3rd optical switch 200, and the output of optical power detector 50 is connected to tested optical fiber.
Fiber failure location: be first set to: D1D2D3D4=0001, after be set to: D1D2D3D4=0010, the first output 22 that is about to fiber optical circulator 27 is connected to optical power detector 50, the first output 22 of fiber optical circulator 27 is connected to tested optical fiber, and the second output 23 of fiber optical circulator 27 is connected to photodetector 30.
By the matrix switch of i.e. the first optical switch 100, the second optical switch 200 and the 3rd optical switch 300 cascades of 31 * 2 optical switches, realize multi-functional, integrated that fiber failure location, visual ruddiness location, measuring light power, fault optical cable identify, the 4th optical switch 400 is realized the multiplexing of photodetector 30, thereby makes structure multi-functional, integrated optical cable failure detector compacter.Utilize four holding wire D1, D2, D3, D4 to control matrix switch, realize the switching of fiber failure location, visual ruddiness location, measuring light power, fault optical cable recognition function.
Preferably, red light source laser 40 is 650nm red light source laser.
Preferably, optical power detector 50 is PIN near infrared photodetector.
Integrated optical cable failure detector light harvesting domain reflectometer Cable's Fault positioning function of the present invention, the visual fault location function of red light source, light power meter measurement function and optical cable recognition function are in one, portable, Highgrade integration, and be the Cable's Fault checkout gear of single port output, can quick diagnosis Cable's Fault.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. an integrated optical cable failure detector, it is characterized in that, comprise: the optical cable identifier that optical time domain reflectometer, red light source laser, optical power detector and monofocal Sagnac interfere, also comprises that 31 * 2 matrix optical switch switching for function, multiplexed optical switch and four are for controlling the holding wire of described 4 optical switches;
The optical cable identifier that monofocal Sagnac interferes comprises optical cable identification laser, photodetector, 3 * 3 couplers and fibre optic isolater;
Optical time domain reflectometer comprises that optical cable seeks barrier laser, wavelength division multiplexer, fiber optical circulator and photodetector;
The first input end of the first optical switch is connected to the output of the second optical switch, and its second input is connected to the output of the 3rd optical switch, and its output is connected to tested optical fiber;
The first input end of the second optical switch is connected to the output of red light source laser, and its second input is connected to the five-port of 3 * 3 couplers of monofocal Sagnac optical interference circuit, and its output is connected to the first input end of the first optical switch;
The first input end of the 3rd optical switch is connected to the first output of the optical fiber circulator of optical time domain reflectometer, and its first output is connected to the second input of the first optical switch, and its second output is connected to the input of optical power detector;
The first input end of the 4th optical switch is connected to the second output of fiber optical circulator, and its second input is connected to the 3rd port of 3 * 3 couplers, and its output is connected to the input of photodetector;
Wherein first signal line (D1) is connected with the first input end of the first optical switch, the first input end of the second optical switch; Secondary signal line (D2) is connected with the second input of the second optical switch, the second input of the 4th optical switch; The 3rd holding wire (D3) is connected with first input end, the 4th optical switch first input end of the 3rd optical switch; The 4th holding wire (D4) is connected with the second input of the first optical switch, the second output of the 3rd optical switch.
2. integrated optical cable failure detector as claimed in claim 1, is characterized in that, described four holding wire D1D2D3D4=1000, and the output signal of red light source laser is transferred to tested optical fiber.
3. integrated optical cable failure detector as claimed in claim 1, it is characterized in that, described four holding wire D1D2D3D4=1000, after be set to D1D2D3D4=0100, the five-port of described 3 * 3 couplers is connected with tested optical fiber, and the 3rd port of 3 * 3 couplers is connected with photodetector.
4. integrated optical cable failure detector as claimed in claim 1, is characterized in that, described four holding wire D1D2D3D4=0001, and described optical power detector output is connected to tested optical fiber.
5. integrated optical cable failure detector as claimed in claim 1, it is characterized in that, described four holding wire D1D2D3D4=0001, after be set to D1D2D3D4=0010, the first output of fiber optical circulator is connected to optical power detector, the first output of fiber optical circulator is connected to tested optical fiber, and the second output of fiber optical circulator is connected to photodetector.
6. integrated optical cable failure detector as claimed in claim 1, is characterized in that, described red light source laser is 650nm red light source laser.
7. integrated optical cable failure detector as claimed in claim 1, is characterized in that, optical power detector is PIN near infrared photodetector.
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| CN104111404A (en) * | 2014-06-16 | 2014-10-22 | 武汉康普常青软件技术股份有限公司 | Polarized light time domain reflection-based power transmission line fault detection system and positioning method |
| CN104467955A (en) * | 2014-12-24 | 2015-03-25 | 北京奥普科达科技有限公司 | High-sensitivity and high-precision optical fiber identification and calibration method and system |
| CN104601227A (en) * | 2015-01-09 | 2015-05-06 | 北京奥普维尔科技有限公司 | Test instrument and test method thereof |
| CN105783954A (en) * | 2016-03-25 | 2016-07-20 | 北京信息科技大学 | High-redundancy FBG sensing module |
| CN106644398A (en) * | 2016-12-30 | 2017-05-10 | 中国科学院深圳先进技术研究院 | Submarine optical cable fault point positioning method |
| CN107135032A (en) * | 2017-05-10 | 2017-09-05 | 合肥慧图软件有限公司 | A kind of Cable's Fault analysis system being combined based on 3S and RTU |
| CN110086529A (en) * | 2019-04-15 | 2019-08-02 | 北京盟力星科技有限公司 | A kind of detecting and analysing system based on fiber optic cable monitor station |
| CN110611532A (en) * | 2018-06-14 | 2019-12-24 | ***通信集团设计院有限公司 | Optical cable joint device and system |
| CN112564781A (en) * | 2020-11-26 | 2021-03-26 | 国网四川省电力公司映秀湾水力发电总厂 | Optical fiber grating line tracker |
| CN113375903A (en) * | 2021-05-14 | 2021-09-10 | 太原理工大学 | Optical fiber breakpoint positioning device |
| CN114001926A (en) * | 2021-12-01 | 2022-02-01 | 上海大维通信技术有限公司 | Optical cable census analyzer and analog signal processing method thereof |
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| CN107135032A (en) * | 2017-05-10 | 2017-09-05 | 合肥慧图软件有限公司 | A kind of Cable's Fault analysis system being combined based on 3S and RTU |
| CN110611532A (en) * | 2018-06-14 | 2019-12-24 | ***通信集团设计院有限公司 | Optical cable joint device and system |
| CN110086529A (en) * | 2019-04-15 | 2019-08-02 | 北京盟力星科技有限公司 | A kind of detecting and analysing system based on fiber optic cable monitor station |
| CN112564781A (en) * | 2020-11-26 | 2021-03-26 | 国网四川省电力公司映秀湾水力发电总厂 | Optical fiber grating line tracker |
| CN112564781B (en) * | 2020-11-26 | 2023-04-07 | 国网四川省电力公司映秀湾水力发电总厂 | Optical fiber grating line tracker |
| CN113375903A (en) * | 2021-05-14 | 2021-09-10 | 太原理工大学 | Optical fiber breakpoint positioning device |
| CN114001926A (en) * | 2021-12-01 | 2022-02-01 | 上海大维通信技术有限公司 | Optical cable census analyzer and analog signal processing method thereof |
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