CN103281118A - Optical cable recognition physical position finder based on optical fiber interference mutual correlation algorithm and recognition positioning method thereof - Google Patents
Optical cable recognition physical position finder based on optical fiber interference mutual correlation algorithm and recognition positioning method thereof Download PDFInfo
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Abstract
The invention relates to an optical cable recognition physical position finder based on an optical fiber interference mutual correlation algorithm and a recognition positioning method thereof, wherein the optical cable recognition physical position finder based on the optical fiber interference mutual correlation algorithm and the recognition positioning method overcome the defect that a specific physical location of an optical cable cannot be judged rapidly and conveniently compared with the prior art. The optical cable recognition physical position finder comprises an operation chip, a main photoelectric detector, a main coupler, an optical fiber reflector, and a vice coupler connected to the optical fiber reflector through a tested optical fiber, and further comprises a vice photoelectric detector, a main interference coupler and a vice interference coupler, wherein a main photoelectric contactor and the main coupler are connected into the main interference coupler, the vice photoelectric detector and the main coupler are connected into the vice interference coupler, the main interference coupler and the vice interference coupler are connected into the vice coupler, and the main photoelectric contactor and a vice photoelectric contactor are connected with the operation chip. According to the optical cable recognition physical position finder based on the optical fiber interference mutual correlation algorithm and the recognition positioning method, not only can a target optical cable be recognized rapidly, but also the specific physical location of the optical cable can be proved and learned rapidly and conveniently, and great convenience is brought to looking-up of optical cable failures and general checking and maintenance of the optical cable.
Description
Technical field
The present invention relates to optical cable identification and physical positioning technical field, is a kind of optical cable identification physics position indicator and recognition positioning method thereof based on the fiber optic interferometric cross correlation algorithm specifically.
Background technology
Along with the development of communication, optical cable is more and more universal in the local application of communication, and being formed on has a large amount of crisscross numerous and diverse optical cables in the communication pipe.No matter be built on stilts and buried, when communication enineer need be searched certain root optical cable, if run into that optical cable identifying comes off or when unclear through the sign of exposing to the weather, can't judge that then concrete which root optical cable damages.Though have the optical cable identifier can identify the optical cable of concrete damage in the market, can't judge the concrete fault point of damaging optical cable.Present existing lookup method mainly contains two kinds: the one, begin to pull one by one from known place, the workpeople damage place that oneself knows along a certain optical cable pulls to find out the optical fiber that will identify always, the method needs the expensive time to search, waste of manpower, and binding place can't separate, and precision is limited.Though the method can be found out the optical cable of damage, also can't judge the spot failure of optical cable.The 2nd, add with the mode of the crooked optical cable of quick freezing liquid by OTDR, utilize quick freezing liquid that optical cable is carried out freezing or crooked optical cable, thereby form OTDR test curve loss ladder.This mode causes very big damage to optical cable, and operation easier is bigger, and potential murder by poisoning is arranged, and concerning the optical cable of bend-insensitive as G.657, then can't be with these two kinds of methods identifications.Particularly utilize OTDR can only test out Cable's Fault point apart from the optical cable cable run distance of switch, and optical cable exists multiple bending, break-in etc. in walking line process, be not the direct range apart from switch, thereby form on the geographical position of detected fault point apart from physical fault point very big difference arranged.Therefore utilize OTDR can only judge roughly abort situation point.The staff can only adopt the way of fuzzy search, behind the arrival abort situation point, carries out negative testing by opening fibre of connector box strip off again after need opening each well lid, checks the existence of failure judgement point one by one.So huge workload makes the repairing difficulty strengthen, and efficient is on the low side, has a large amount of inconvenience.And the existing optical cable identifier that mainly contains three families on the market is respectively Korea S's one promise, middle electric 34 and Wuhan Lei Teer science and technology.The product of Korea S's one promise and Wuhan Lei Teer reacts from test site, and is relatively poor from signal to noise ratio, and sound articulation is not high, and product price is higher, is the cabinet formula simultaneously, carries inconvenience.34 product shortcomings of middle electricity are that dynamic range is little, and test signal is not obvious, is easy to generate erroneous judgement.Above-mentioned three tame products not only realizing there is defective aspect the optical cable identification, more can not be realized the concrete physical positioning function of optical cable.Finally how to develop a kind of target optical cable of judging exactly and realize that also the equipment that the target optical cable is carried out physical positioning has become urgent problem.
Summary of the invention
To the objective of the invention is the defective that to judge the concrete physical location of optical cable in the prior art quickly and easily in order solving, to provide a kind of optical cable identification physics position indicator and localization method thereof based on the fiber optic interferometric cross correlation algorithm to solve the problems referred to above.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of optical cable identification physics position indicator based on the fiber optic interferometric cross correlation algorithm, comprise compute chip, main photodetector, main coupler, fibre reflector and by tested optical fiber be connected on the fibre reflector from coupler, also comprise from photoelectric detector, main interference coupler and from interference coupler, described key light electric contactor and main coupler insert the main interference coupler, describedly insert from interference coupler from photoelectric detector and main coupler, described main interference coupler and insert from coupler from interference coupler, described key light electric contactor with link to each other with compute chip from the photoelectricity contactor.
Also comprise light source, described light source is connected on the main coupler.
A kind of recognition positioning method of optical cable identification physics position indicator,
1), data acquisition, it is 1 MS/s that sample rate is set, by main photodetector with collect signal x and the y of two cross-correlation from photoelectric detector;
2), zero-mean is handled, and it is zero stationary signal that the signal x that gathers and y are converted to average;
3), calculate cross-correlation coefficient, utilize the function equivalence that the signal of each collection is carried out naturalization;
4), the FIR low-pass filtering is carried out the 100kHz low-pass filtering to signal;
5), computing cross-correlation to carrying out cross-correlation function Rxy computing through two signal x after the above-mentioned processing and y pointwise, is found out maximum several points from operation result, the time difference of these presentation of events points, thus obtain the distance of beating point.
In the described computing cross-correlation, if the institute beating point position of surveying and the fault point that records with OTDR are apart from identical, be physical fault point place, as inequality, then the distance that records by beating point calculates the physical fault point with the difference of the measuring distance of the fault point that records with OTDR.
Beneficial effect
A kind of optical cable identification physics position indicator and recognition positioning method thereof based on the fiber optic interferometric cross correlation algorithm of the present invention, according to the optical fiber buoyancy effect, utilize the method for optical interference, coherent demodulation by light is converted to optical signal and audio signal with the percussion vibration signal of optical cable, accurately search and identify the target optical cable that is layed under the environment such as people's well, tunnel, pipeline and electric pole be built on stilts, thereby conveniently find out the target optical cable, can also find out the concrete physical location of optical cable quickly and easily.The engineering staff only needs to knock optical cable gently and shows by the form of sound and figure on instrument in the working site, and can measure the concrete physical location of target optical cable exactly, easily identifies the concrete physical distance of optical cable.Can find out the fault spot failure of target optical cable fast and accurately by the present invention, for vast optical cable maintenance engineering staff provides the instrument that ensures accurately and rapidly.Greatly facilitate generaI investigation and the maintenance with optical cable of searching of Cable's Fault, improved the unobstructed property of use and the operating efficiency of communication network greatly, saved the repairing time.
Description of drawings
Fig. 1 is the structural representation of employed optical cable generaI investigation instrument in the prior art
Fig. 2 is structural representation of the present invention
Wherein, 1-light source, 2-main photodetector, 3-from photoelectric detector, 4-fibre reflector, 5-master's coupler, 6-from coupler, 7-main interference coupler, 8-from interference coupler, 9-tested optical fiber, 10-compute chip.
Fig. 3 is the precedence diagram of the method for the invention
Embodiment
Further understand and understanding for making architectural feature of the present invention and the effect reached had, cooperate detailed explanation in order to preferred embodiment and accompanying drawing, be described as follows:
As shown in Figure 1, optical cable generaI investigation instrument of the prior art utilizes the principle of Mach one damp moral (Mach-Zehnder) interferometer.The output of light source connects a port of coupler, the two-beam that is divided into.An a branch of port that connects coupler through long optical fibers; Another bundle directly connects another port of coupler.Two-beam is connected to optical fiber in the tested optical cable through the synthetic a branch of light of coupler, and optical fiber connector connects reflective optical system.Reverberation is divided into two-beam along optical fiber to coupler, and is a branch of through long optical fibers, mixes at the coupler place with another bundle.Because different formation of the propagation path of two-beam interfered, interference signal is converted to the signal of telecommunication through photoelectric detector, by the analyzing and processing to this signal of telecommunication, can obtain extraneous information.
As shown in Figure 2, a kind of light of the present invention is based on the optical cable identification physics position indicator of fiber optic interferometric cross correlation algorithm, comprise main photodetector 2, main coupler 5, from coupler 6 and fibre reflector 4, describedly be connected on the fibre reflector 4 by tested optical fiber 9 from coupler 6, also comprise from photoelectric detector 3, main interference coupler 7 with from interference coupler 8.Described key light electric contactor 2 and main coupler 5 inserts main interference couplers 7, describedly inserts from interference coupler 8 described main interference coupler 7 and insert from coupler 6 from interference coupler 8 from photoelectric detector 3 and main coupler 5.Light source 1 is connected on the main coupler 5, key light electric contactor 2 with link to each other with compute chip 10 from photoelectricity contactor 3.Main interference coupler 7 and be used for reverberation from interference coupler 8 and form interference therein just can be identified the target optical cable by main photodetector 2 with from the signal of photoelectric detector 3 like this after compute chip 10 enterprising row operations.
The output of light source 1 connects a two-beam that port is divided into of main coupler 5, and a branch of main interference coupler 7 that connects connects a port from coupler 6 again through long optical fibers; Another bundle connects behind interference coupler 8, directly is connected to another port from coupler 6.Two-beam is through being connected to the optical fiber 9 the tested optical cable from coupler 6 synthetic a branch of light, optical fiber connector connects fibre reflector 4.Reverberation along tested optical fiber 9 to being divided into two-beam from coupler 6.A branch of through long optical fibers, form interference at main interference coupler 7 places, interference signal is converted to the signal of telecommunication through main photodetector 2; Another Shu Zaicong interference coupler 8 places form and interfere, and interference signal is through being converted to the signal of telecommunication from photoelectric detector 3.These two signals of telecommunication are carried out analyzing and processing by compute chip 10, can find the target optical cable by apply knocking to optical cable, can also realize the physical positioning of beating point.
A kind of optical cable recognition positioning method,
The first step, data acquisition, it is 1 MS/s that sample rate is set, and can make up cross-correlation function Rxy (τ) and cross covariance function Cxy (τ) thus by main photodetector 2 with from signal x (t) and y (t) that photoelectric detector 3 collects two cross-correlation;
In second step, zero-mean is handled, and it is zero stationary signal that the signal x (t) that gathers and y (t) are converted to average, and the direct current biasing of elimination two paths of signals makes function R xy (τ) and Cxy (τ) equivalence;
The 3rd step, calculate cross-correlation coefficient, utilize the function equivalence that the signal of each collection is carried out naturalization, eliminate the gain error of two paths of signals, highlight the correlation degree of signal x (t) and y (t);
In the 4th step, the FIR low-pass filtering is carried out the 100kHz low-pass filtering to signal, FIR(Finite Impulse Response) low-pass filtering to be to reduce the interference of out-of-band noise;
The 5th step, computing cross-correlation, to carrying out cross-correlation function Rxy (τ) computing through two signal x (t) and y (t) pointwise after the above-mentioned processing, from operation result, find out maximum several points, the time difference of these presentation of events points, thereby obtain the distance of beating point, obtain the distance of beating point.Work by these five steps can be finished searching optical cable.The acquisition of this beating point is by according to the optical fiber buoyancy effect, utilizes the method for optical interference, and the coherent demodulation by light is converted to optical signal and audio signal with the percussion vibration signal of optical cable, and is different with the OTDR method.
The definition long optical fibers 9 known length be L1, from interference coupler 8 with directly be connected from coupler 6, its length is ignored; Distance from coupler 6 to beating point is L2, and beating point is L3 to the distance of fibre reflector 4.Interference signal and this three length of producing at main interference coupler 7 with from interference coupler 8 are closely related, and light signal to be same light source send, so two interference signals meet the cross-correlation condition.By cross correlation algorithm, it is known adding L1, just can calculate L2 and L3, thereby realizes the physical positioning of beating point.Test out the concrete physical positioning of optical cable by knocking optical cable, can realize the multiple use to the optical cable data, as to target optical cable under the well lid apart from switch the position physical location carry out mark, also can directly plan out replacement length during to the replacement of optical cable line related, can also be as referential data use of some other data etc.During wherein as the judgement of Cable's Fault point, can use following method: in the computing cross-correlation in the 5th step, can carry out the judgement of Cable's Fault point, its determination methods is for testing the physical fault point of OTDR earlier, because this test is to walk always according to optical cable that failure judgement tests out a position of failure point in logic apart from the position of switch.The target optical cable is knocked, the beating point of measuring by the present invention is apart from the distance of handing-over machine again, if institute's beating point of surveying and the fault point that records with OTDR apart from identical, are the physical fault point.If institute's beating point of surveying and the fault point that records with OTDR are apart from inequality, then can obtain measuring distance poor of the beating point distance that records and the fault point that records with OTDR, for finding the physical fault point to find the parameter of a relative physical distance, according to this physical distance parameter, judge the physical fault point again.The realization of this The Application of Technology and product is revolutionary innovation for optical cable maintenance and repairing, has improved operating efficiency widely, has saved the repairing time.Optical cable identification physics position indicator has been arranged, for vast optical cable maintenance engineering staff provides the instrument that ensures accurately and rapidly, thereby improved the unobstructed property of use of communication network greatly.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and the specification is principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the present invention.The protection range that the present invention requires is defined by appending claims and equivalent thereof.
Claims (4)
1. the optical cable based on the fiber optic interferometric cross correlation algorithm is identified the physics position indicator, comprise compute chip (10), main photodetector (2), main coupler (5), fibre reflector (4) and by tested optical fiber (9) be connected on the fibre reflector (4) from coupler (6), it is characterized in that: also comprise from photoelectric detector (3), main interference coupler (7) and from interference coupler (8), described key light electric contactor (2) and main coupler (5) insert main interference coupler (7), describedly insert from interference coupler (8) described main interference coupler (7) and insert from coupler (6) from interference coupler (8) from photoelectric detector (3) and main coupler (5); Described key light electric contactor (2) with link to each other with compute chip (10) from photoelectricity contactor (3).
2. the optical cable based on the fiber optic interferometric cross correlation algorithm according to claim 1 is identified the physics position indicator, and it is characterized in that: also comprise light source (1), described light source (1) is connected on the main coupler (5).
3. optical cable according to claim 1 is identified the recognition positioning method of physics position indicator, it is characterized in that: comprise the steps,
1), data acquisition, it is 1 MS/s that sample rate is set, by main photodetector (2) with collect signal x (t) and the y (t) of two cross-correlation from photoelectric detector (3);
2), zero-mean is handled, and it is zero stationary signal that the signal x (t) that gathers and y (t) are converted to average;
3), calculate cross-correlation coefficient, utilize the function equivalence that the signal of each collection is carried out naturalization;
4), the FIR low-pass filtering is carried out the 100kHz low-pass filtering to signal;
5), computing cross-correlation to carrying out cross-correlation function Rxy (τ) computing through two signal x (t) and y (t) pointwise after the above-mentioned processing, is found out maximum several points from operation result, the time difference of these presentation of events points, thus the distance of beating point obtained.
4. recognition positioning method according to claim 3, it is characterized in that: in the described computing cross-correlation, if the institute beating point position of surveying and the fault point that records with OTDR are apart from identical, be physical fault point place, as inequality, then the distance that records by beating point calculates the physical fault point with the difference of the measuring distance of the fault point that records with OTDR.
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| CN111884709A (en) * | 2020-07-20 | 2020-11-03 | 中铁第四勘察设计院集团有限公司 | Railway communication optical cable on-line monitoring system and method |
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