CN102739311B - Fiber failure positioner and localization method thereof based on chaos visible laser - Google Patents
Fiber failure positioner and localization method thereof based on chaos visible laser Download PDFInfo
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- CN102739311B CN102739311B CN201210206103.4A CN201210206103A CN102739311B CN 102739311 B CN102739311 B CN 102739311B CN 201210206103 A CN201210206103 A CN 201210206103A CN 102739311 B CN102739311 B CN 102739311B
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Abstract
The invention discloses a kind of fiber failure positioner based on chaos visible laser, including chaos visible laser discharger, fiber coupler, optical circulator, photodetector, A/D converter, signal processing apparatus and display device; The chaos visible laser signal that described chaos visible laser discharger is launched produces significantly visible speck in the trouble point (11) of testing fiber circuit (4) because of transmission, finds visible speck and can realize being accurately positioned of trouble point within the distance range of sensing point to trouble point (11). The present invention by chaos visible laser as probe source, chaos dependent failure point detection technique and visible ray fiber failure point detection technique are integrated, achieve the quick and precisely detection and location of fiber failure point, solve fiber failure point and easily measure and not easy positioning of problem.
Description
Technical field
The present invention relates to a kind of laser ranging system and distance-finding method, particularly a kind of visualization high-precision optical fiber fault locator based on chaos visible laser and localization method thereof.
Background technology
Along with optical fiber is in the extensive use of communication and sensory field, fiber failure detecting device has become optical fiber construction detection and requisite instrument in breakdown maintenance. at present, conventional fiber failure detection technique has: HONGGUANG fiber failure detection technique [CN201269801] and optical time domain reflection technology [CN1681227]. wherein, HONGGUANG fiber failure detection technique takes full advantage of the visible properties of HONGGUANG, produce visible speck by HONGGUANG in the transmission of fiber failure point place and realize being accurately positioned fiber failure point, but the method requires that testing staff must at fault in-situ, by visual method trouble-shooting point, it is impossible to the physical location of precognition fiber failure point and scope, in long-distance optical fiber fault detect, workload is big, thus usually used as the aid of other fiber failure point location technology, optical time domain reflection technology is by observing after optical fiber to Rayleigh scattering and Fresnel reflection signal, the signal intensity detected and time of return is utilized to carry out the detection optical fiber attenuation characteristic along the direction of propagation, and then detection, the exception judged in link, and localization of faults position, that commonly uses at present has pulsed optical time domain reflection technology, pscudo-random codc modulation optical time domain reflection technology [EP0269448] and chaos optical time domain reflection technology [CN101226100]. wherein traditional pulsed light time domain reflection technology can not realize with narrowing of pulse width due to the raising of pulse power in principle simultaneously, the dynamic range and the resolution that cause its measurement become a pair implacable contradiction, and its Measurement Resolution is only relevant with the response time of pulse width and photoelectric detection system, it is achieved the cost of improvement is high and has little effect, the optical time domain reflection technology of pscudo-random codc modulation utilizes the light pulse of pscudo-random codc modulation as detectable signal, the range information of sensing point and trouble point is obtained by signal is carried out relevant treatment, solve the contradiction that resolution cannot improve simultaneously with dynamic range, principle can improve measurement dynamic range and the resolution of optical time domain reflectometer, but such optical time domain reflectometer is limited to the spectral bandwidth of pseudo noise code signal, resolution is not greatly improved, fail the advantage well embodying optical time domain reflectometer measurement aspect, and its higher cost of manufacture constrains its scope of application, chaos optical time domain reflection technology realizes the detection of fiber failure point based on the cross-correlation method of chaotic laser light signal, overcome traditional pulse optical time domain reflectometer and pscudo-random codc modulation optical time domain reflectometer measures the shortcoming that blind area is big, improve the resolution of trouble point detection, achieve with apart from unrelated high-acruracy survey, optical fiber length measuring for test point Yu trouble point is very accurate, but in actual trouble point detection process, cannot solve because the problem that bending causes measurement and positioning and trouble point physical location not to be inconsistent laid by optical fiber, trouble point is accurately positioned needs double measurement or other subsidiaries, it is difficult to quickly being accurately positioned of trouble point.
Summary of the invention
The present invention is based on above-mentioned prior art, to solve because optical fiber lays that the linear measure longimetry location that causes of bending is not inconsistent with trouble point physical location, the position of failure point that causes is difficult to the problem determined, provides a kind of fiber failure positioner based on chaos visible laser and localization method thereof for being quickly accurately positioned fiber failure point position.
For achieving the above object, the present invention is by the following technical solutions:
A kind of fiber failure positioner based on chaos visible laser, including chaos visible laser discharger, fiber coupler, optical circulator, photodetector, A/D converter, signal processing apparatus and display device; Described chaos visible laser discharger is visible light wave range is chaos visible light semiconductor laser or the chaos He-Ne laser instrument of 390-760nm; The chaos visible laser signal that described chaos visible laser discharger is launched is divided into detection light and reference light by fiber coupler (2); Detection light is transmitted in testing fiber circuit (4) through optical circulator (3), reflection due to trouble point (11), reflection light enters the first photodetector (5) through optical circulator (3) and is converted to the signal of telecommunication, and the signal of telecommunication is converted to detection digital signal entering signal through the first A/D converter (7) and processes device (9); Reference light is converted to the signal of telecommunication through the second photodetector (6), is converted to reference digital signal entering signal then through the second A/D converter (8) and processes device (9); Entering signal processes the detection digital signal of device (9) and the reference number signal of telecommunication obtains sensing point after signal processing and to the distance range between trouble point (11) and is shown on corresponding display (10), the chaos visible laser signal that described chaos visible laser discharger is launched produces significantly visible speck in the trouble point (11) of testing fiber circuit (4) because of transmission, finds visible speck and can realize being accurately positioned of trouble point within the distance range of sensing point to trouble point (11).
Described fiber failure positioner, described chaos visible light semiconductor laser is that a visible light semiconductor laser adds a feedback device, or a visible light semiconductor laser connects another visible light semiconductor laser and constitutes.
Described fiber failure positioner, described chaos He-Ne laser instrument is that a He-Ne laser instrument adds a feedback device, or He-Ne laser instrument connects another He-Ne laser instrument
The localization method of the described fiber failure positioner based on chaos visible laser, the chaos visible laser signal that described chaos visible laser discharger is launched is divided into detection light and reference light by fiber coupler (2); Detection light is transmitted in testing fiber circuit (4) through optical circulator (3), reflection due to trouble point (11), reflection light enters the first photodetector (5) through optical circulator (3) and is converted to the signal of telecommunication, and the signal of telecommunication is converted to detection digital signal entering signal through the first A/D converter (7) and processes device (9); Reference light is converted to the signal of telecommunication through the second photodetector (6), is converted to reference digital signal entering signal then through the second A/D converter (8) and processes device (9); Entering signal processes the detection digital signal of device (9) and the reference number signal of telecommunication obtains sensing point after signal processing and to the distance range between trouble point (11) and is shown on corresponding display (10), the chaos visible laser signal that described chaos visible laser discharger is launched produces significantly visible speck in the trouble point (11) of testing fiber circuit (4) because of transmission, finds visible speck and can realize being accurately positioned of trouble point within the distance range of sensing point to trouble point (11).
A kind of fiber failure positioner based on chaos visible laser that the present invention is above-mentioned provided and localization method thereof, compared with existing fiber failure point location technology, have the advantage that
(1) apparatus of the present invention simple in construction. Use a device to realize the measurement of fiber failure point position and visual simultaneously, eliminate the subsidiary of other instrument, simplify measurement apparatus, saved testing cost.
(2) present invention achieves the quick location of fiber failure point. Realized on the basis that fiber failure point position range is measured by chaos method of correlation, utilize observability quick fault point position in fiber failure point position range of light source, avoid the double measurement that other localization of fault instrument realizes introducing in precise positioning process, it is achieved that the quick location of fiber failure point.
(3) fiber failure point location of the present invention to realize process simple. The test point fiber lengths to trouble point can be obtained by one-shot measurement, and be accurately positioned fiber failure point position.
(4) optical fiber is not caused damage by being accurately positioned of fiber failure point by the present invention. Common fault point positioning method needs to damage (as cut off, strip off covering) optical fiber near trouble point and carries out double measurement, the present invention directly utilizes the detection of chaos visible light source and realizes the visualization of trouble point, it is to avoid damage optical fiber.
Accompanying drawing explanation
Fig. 1 is the structural representation of the fiber failure positioner based on chaos visible laser of the present invention.
Fig. 2 is the structural representation of the chaos visible laser generator of the visible light semiconductor laser composition of the present invention.
Fig. 3 is the structural representation of the chaos visible laser generator of space of the present invention visible light semiconductor laser or He-Ne laser instrument composition.
Fig. 4 is the fiber lengths of the fiber failure point distance measurement point that the present invention utilizes cross-correlation calculation to obtain and the actual position of failure point laying optical fiber, wherein, solid line represent optical fiber actual laying situation dotted line represent utilize the calculated fiber lengths information of cross-correlation method.
In figure: 1: chaos visible laser generator; 2: fiber coupler I; 3: optical circulator; 4: testing fiber circuit; 5: photodetector I; 6: photodetector II; 7:A/D transducer I; 8:A/D transducer II; 9: signal processing apparatus; 10: display; 11: trouble point; 12: visible light semiconductor laser; 13: fiber coupler II; 14: feedback device; 15: space visible light semiconductor laser or He-Ne laser instrument; 16: spatial light colimated light system; 17: be coated with the beam splitter of anti-reflection film; 18: light reflection mirror.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Implement a kind of fiber failure positioner based on chaos visible laser of the present invention, as it is shown in figure 1, the present invention mainly includes chaos visible laser generator 1, fiber coupler 2, optical circulator 3, photodetector 5, photodetector 6, A/D converter 7, A/D converter 8, signal processing apparatus 9 and display 10 based on the visualization high-precision optical fiber fault locator of chaos visible laser. Wherein:
Described chaos visible laser generator 1 can be constituted (as shown in Figure 2) by visible light semiconductor laser 12, fiber coupler 13 and feedback device 14, and wherein feedback device 14 can be the optical fiber of numeral reflexometer or end face plating reflectance coating or is made up of fiber grating and adjustable optical attenuator. A part of light of visible light semiconductor laser 12 output is reflected back in visible light semiconductor laser 12 through external feedback device 14, makes visible light semiconductor laser 12 export chaos visible laser signal; If feedback device 14 is another visible light semiconductor laser, injects visible light semiconductor laser 12 by outer light and also can produce chaos visible laser.
As shown in Figure 3, chaos visible laser generator 1 can also be made up of the visible light semiconductor laser in space or He-Ne laser instrument 15: the visible light semiconductor laser in space or the output light of He-Ne laser instrument 15 collimate through spatial light colimated light system 16, makes the visible light semiconductor laser in space or He-Ne laser instrument 15 produce chaos visible laser by being coated with a part of light of anti-reflection film beam splitter 17 and reflecting back through external mirror.
The chaos visible laser sent by chaos visible laser generator 1, is divided into two-way through fiber coupler 2: detection light I and reference light II. Detection light I is injected into tested optical fiber circuit 4 through optical circulator 3, trouble point 11 light reflected enters photodetector 5 through optical circulator 3, converts optical signal into the signal of telecommunication; Then it is directly entered photodetector 6 with reference to letter light II, converts optical signal into the signal of telecommunication. Two path signal is converted to digital signal through A/D converter 7 and A/D converter 8 respectively, and input signal processing apparatus 9 and carry out cross-correlation calculation, obtain light from fiber-optic probe point to trouble point between propagation time, calculate sensing point to the distance range information between trouble point in conjunction with light spread speed in a fiber, and distance range information is exported by display 10.
Embodiment 2
Implement the localization method of a kind of fiber failure positioner based on chaos visible laser for embodiment 1 of the present invention: chaos visible light signal is divided into detectable signal I and reference signal II through fiber coupler 2, reference signal and the echo-signal entering signal after fiber failure point 11 reflects process device 9 and do cross correlation process, cross correlation process realizes the principle of light propagation time in a fiber measurement: assume that the chaotic laser light that chaos visible laser generator produces meets the feature of aperiodic function f (t), the chaos light I being divided into by fiber coupler and chaos light II corresponds with the feature of function k*f (t) and (1-k) f (t), chaos light I light after fiber failure point reflection as detection light meets functional relation k*f (t-��0) feature, process after device 9 when two signals obtain digital signal entering signal through respective process, the mathematic(al) representation carrying out cross correlation process is: As ��=��0Time, there is peak value in function, obtain light propagation time t in testing fiber, and then calculated, by formula L=V*t/2, the distance that light is propagated in testing fiber, namely trouble point 11 is apart from the fiber lengths L of test point, thus obtaining the ultimate range scope of fiber failure point, and exported by display 10. The visible properties of recycling chaos visible laser, significantly visible speck can be produced because of transmission in trouble point 11, it is the physical location of trouble point, therefore only need to find visible speck within the ultimate range scope of fiber failure point and can realize being accurately positioned of trouble point. Chaos dependent failure point detection technique and visible ray fiber failure point detection technique are merged, first realize the rough measure to fiber failure point position range, then in the scope measured, being accurately positioned of fiber failure point position is completed, to realize the quick and precisely location of fiber failure point position.
It should be appreciated that for those of ordinary skills, it is possible to improved according to the above description or converted, and all these are improved and convert the protection domain that all should belong to claims of the present invention.
Claims (2)
1. the fiber failure positioner based on chaos visible laser, it is characterised in that include chaos visible laser discharger, fiber coupler, optical circulator, photodetector, A/D converter, signal processing apparatus and display device; Described chaos visible laser discharger is visible light wave range is chaos visible light semiconductor laser or the chaos He-Ne laser instrument of 390-760nm; The chaos visible laser signal that described chaos visible laser discharger is launched is divided into detection light and reference light by fiber coupler (2); Detection light is transmitted in testing fiber circuit (4) through optical circulator (3), reflection due to trouble point (11), reflection light enters the first photodetector (5) through optical circulator (3) and is converted to the signal of telecommunication, and the signal of telecommunication is converted to detection digital signal entering signal through the first A/D converter (7) and processes device (9); Reference light is converted to the signal of telecommunication through the second photodetector (6), is converted to reference digital signal entering signal then through the second A/D converter II (8) and processes device (9); Entering signal processes the detection digital signal of device (9) and the reference number signal of telecommunication obtains sensing point after signal processing and to the distance range between trouble point (11) and is shown on corresponding display (10), the chaos visible laser signal that described chaos visible laser discharger is launched produces significantly visible speck in the trouble point (11) of testing fiber circuit (4) because of transmission, finds visible speck and can realize being accurately positioned of trouble point within the distance range of sensing point to trouble point (11); Described chaos visible light semiconductor laser is that a visible light semiconductor laser adds a feedback device, or a visible light semiconductor laser connects another visible light semiconductor laser and constitutes;
Described chaos He-Ne laser instrument is that a He-Ne laser instrument adds a feedback device, or He-Ne laser instrument connects another He-Ne laser instrument.
2. the localization method of the fiber failure positioner based on chaos visible laser applied described in claim 1, it is characterized in that, the chaos visible laser signal that described chaos visible laser discharger is launched is divided into detection light and reference light by fiber coupler (2); Detection light is transmitted in testing fiber circuit (4) through optical circulator (3), reflection due to trouble point (11), reflection light enters the first photodetector (5) through optical circulator (3) and is converted to the signal of telecommunication, and the signal of telecommunication is converted to detection digital signal entering signal through the first A/D converter (7) and processes device (9); Reference light is converted to the signal of telecommunication through the second photodetector (6), is converted to reference digital signal entering signal then through the second A/D converter (8) and processes device (9); Entering signal processes the detection digital signal of device (9) and the reference number signal of telecommunication obtains sensing point after signal processing and to the distance range between trouble point (11) and is shown on corresponding display (10), the chaos visible laser signal that described chaos visible laser discharger is launched produces significantly visible speck in the trouble point (11) of testing fiber circuit (4) because of transmission, finds visible speck and can realize being accurately positioned of trouble point within the distance range of sensing point to trouble point (11).
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