CN105823494A - System and method of intelligently recognizing optical cable - Google Patents

System and method of intelligently recognizing optical cable Download PDF

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Publication number
CN105823494A
CN105823494A CN201610153330.3A CN201610153330A CN105823494A CN 105823494 A CN105823494 A CN 105823494A CN 201610153330 A CN201610153330 A CN 201610153330A CN 105823494 A CN105823494 A CN 105823494A
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China
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photoswitch
light
optical cable
fiber grating
wavelength
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CN201610153330.3A
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Chinese (zh)
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毛志松
白金刚
薛鹏
朱惠君
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北京中科光讯科技有限公司
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Priority to CN201610153330.3A priority Critical patent/CN105823494A/en
Publication of CN105823494A publication Critical patent/CN105823494A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
    • G01D5/268Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light using optical fibres

Abstract

The invention provides a system and a method of intelligently recognizing an optical cable. The system comprises at least one broadband light source, a beam splitter, a detector, a first optical switch, a coupler, an optical cable, an optical cable recognizer, a second optical switch, an FBG demodulator and a central demodulator. Through recognizing the central wavelength, the spatial location and the reflection energy of a group of fiber Bragg gratings, a function of recognizing the optical cable is realized. Detection light whose wavelength is orthogonal with that of a communication signal is adopted, and thus, communication of the optical cable is not influenced, the structure is simple, the cost is low, and using effects are good.

Description

Optical cable intelligent identifying system and method
Technical field
The present invention relates to a kind of optical cable intelligent identifying system and method, particularly relate to a kind of optical cable identification system not using existing IODN equipment and auxiliary equipment thereof, belong to optical fiber class detection technique field.
Background technology
In prior art, optical fiber is identified by fiber identification mainly by third party's media electronic label, existing domestic market is mainly based on Huawei IODN, have multinomial national and foreign standards, its method is mainly embedded in electronic label read/write at optical fiber distributing dish, electronic tag ring on overlapping on optical patchcord, to realize the identification of optical cable, there is a kind of major defect that must use third party's medium in this technology, must carry out optical patchcord two ends electronic tag matching and must must not coming off, this just has a strong impact on the use of this technology.
In the patent application of such as Application No. CN201210207967.8, it is by arranging port-mark in iODF equipment, the jumping fiber configuration information etc. associated in port is stored, and when jumping fiber is correct, when i.e. the information of port-mark association is consistent with the information that the adapter card arranged on socket carries, showing that port is correct, the program realizes the correct identification to optical fiber by arranging extra physical device in port, thus ensures the correctness that port connects.The most such as in the patent application of Application No. CN200910002203.3, it is by arranging SSFBG and heating module in fiber optic network, temperature sensor, the mode of temperature controller, by the SSFBG in optical fiber is carried out temperature control, to change its reflection wavelength, thus realize the coding to optical fiber, and this mode, need to control the most accurate to temperature, the most necessarily there is code error, or cannot be to the problem encoding effective identification, in actual applications, sealing to device, the stability of applied environment has the highest requirement, do not adapt to the present stage use requirement to fiber optic network.
Based on the above-mentioned problems in the prior art, a kind of optical cable that substantially carries out from optical cable is needed to know method for distinguishing.Existing technology is just improved under this technical background by the present invention.
Summary of the invention
For problems of the prior art, the present invention provides a kind of method of optical cable Intelligent Recognition, on the premise of not affecting signal propagation, using optical cable self as identifying medium, to overcome the deficiencies in the prior art.Specifically, the invention provides techniques below scheme.
First, the invention provides a kind of optical cable intelligent identifying system, it is characterised in that described system includes high power stability light source, demodulation of phase locking module, bonder, optical cable, optical cable evaluator;
Described demodulation of phase locking module, for being measured fiber position, comprises central controller, FBG (FBG) demodulator, photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light);
Described central controller receives the feedback signal of FBG (FBG) demodulator, and described central controller is connected with photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light) respectively;
Described high power stability light source is connected with photoswitch 1 (the first photoswitch), and photoswitch 1 (the second photoswitch) is for being modulated the emergent light of high power stability light source;
Described photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light) are connected with bonder respectively;
Described optical cable evaluator is formed by implanting single or multiple fiber grating in optical cable fibre core.Herein, optical cable evaluator is one preferred embodiment, those skilled in the art it will be clear that, the optical cable fibre core of any structure of fiber grating can be implanted, all can be as an optical cable evaluator, and, this optical cable evaluator can be the extra device added in optical cable, such as at the seam etc. of one section of optical fiber, can also be at the beginning of optical cable produces, the one or more fiber gratings being just scribed in optical cable are constituted, i.e., this optical cable evaluator can be produce at the beginning of be just integrally with optical cable, can also be that additional devices is connected in optical cable be formed, it is not limited with said structure, enable to fiber grating embed or in access optical cable fibre core, to form any prior art of reflection light, all can be applicable to this, and within all should being contemplated as falling within protection scope of the present invention.
Preferably, in described system, the test light for detection is orthogonal for the optical signal of communication with optical cable, so, would not impact normal optic communication.
Preferably, described high power stability light source comprises at least one wideband light source, beam splitter and detector, and described wideband light source is connected with beam splitter, and described beam splitter is connected with photoswitch 1 (the first photoswitch), detector respectively;
And result of detection is fed back to wideband light source by described detector.Wideband light source herein can arrange multiple, complexity according to concrete system and the feature of light source or wavelength requirement etc. are arranged, the most only need the situation etc. of the light of one or more specific wavelength, in addition, this high power stability light source multiple can also be set, can arrange according to the needs of whole optical cable identification system, be not limited thereto herein.Additionally, this high power stability light source can also use other alternative to realize, as long as this light source meets power height and has stability, can be made up of kinds of schemes, for example with the laser diode of band power detection as above-mentioned light source, described laser diode separate a part of light as detection light, from certain pin of laser diode read this detection light numerical value, then carry out power detection feedback control.
Preferably, in described demodulation of phase locking module, central controller, by regulation described photoswitch 1 (the first photoswitch), the time delay of photoswitch 2 (the second light opens the light), carries out output light wavelength intensity locking.
Preferably, described demodulation of phase locking module from the reflection light of fiber grating, and obtains the parameter of described reflection light by the demodulation of FBG (FBG) demodulator, and described parameter at least includes the wavelength of fiber grating, the locus of fiber grating, reflected energy.
It is further preferable that according to the parameter to the described fiber grating detected in optical cable, i.e. can identify which fiber grating specifically detect be, such that it is able to know its optical cable being subordinate to, and the details that optical cable is corresponding.As for how identification information to be carried out corresponding storage in data base with optical cable information; so that search is searched; it is then that those skilled in the art can realize in conjunction with the conventional method in data processing field; such as; one_to_one corresponding storage is carried out according to parameter, fiber grating, optical cable title or optical cable numbering; can also be the corresponding optical cable title of parameter or the optical cable numbering of two or more fiber grating; the coding i.e. formed with multiple fiber gratings; corresponding optical cable or a fiber segment etc., the most not as the restriction of scope.
Additionally, present invention also offers a kind of optical cable intelligent identification Method, being applied in optical cable identification system, described system includes high power stability light source, demodulation of phase locking module;Described demodulation of phase locking module comprises central controller, FBG (FBG) demodulator, photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light), optical cable to be measured, and at least one fiber grating being arranged in described optical cable;Described central controller is connected with photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light) respectively;Described high power stability light source is connected with photoswitch 1 (the first photoswitch);It is characterized in that:
The time delay of described central controller controls photoswitch 1 (the first photoswitch), in order to regulate the parameter of the high power stability light source emergent light being connected with photoswitch 1, described parameter at least includes the one in pulsewidth, repetition rate, waveform;
Described central controller regulation photoswitch 1 (the first photoswitch), the time delay of photoswitch 2 (the second light opens the light), carry out Wavelength strength locking, and when being locked by intensity, the time delay of two photoswitches is to determine fiber grating position.
Preferably, described FBG (FBG) demodulator receives the reflection light from described fiber grating by photoswitch 2 (the second light opens the light), and this reflection light is demodulated, to feed back in central controller according to the reflection signal that obtains of light, it is achieved the feedback control that central controller is delay locked to photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light).
Preferably, parameter after reflection light is demodulated by described FBG (FBG) demodulator sends to central controller, central controller, by described parameter being compared with the parameter demarcated, identifies corresponding fiber grating, and searches for the optical cable numbering corresponding with this fiber grating in data base.nullIt is to be noted,The described fiber grating identified,When multiple fiber gratings constitute a coding,When a corresponding optical cable or fiber segment,One fiber grating may corresponding multiple optical cables numbering,And the various combination mode of the plurality of fiber grating,Each particular combination mode can corresponding optical cable coding,Thus realize the identification to optical cable numbering,I.e.,In the present invention,Identification optical cable is numbered,Can be to be completed by a specific fiber grating,Can also be that the assembly coding according to two or more fiber gratings completes to identify,And concrete coded system,It can be the permutation and combination method utilizing the most multiple fiber grating、Space encoding mode,And the coded system that can use in other this area,The most the restriction in this, as scope is not understood,It is capable of unique fiber grating correspondence coded system demarcated of optical cable numbering all can be applicable to this.
Preferably, prestore in data base the fiber grating parameter demarcated, and by corresponding with optical cable numbering for described parameter storage;
Described parameter at least includes the one in optic fiber grating wavelength, fiber grating locus, reflected energy.
Preferably, the position that described fiber grating is arranged should be chosen at the centre of optical cable as far as possible, it is to avoid end face reflection brings impact to demodulation, the maximum of the demodulating error that the spacing of described fiber grating should produce more than the change of temperature and centre wavelength.
Preferably, Wavelength strength locking i.e. according to the optic fiber grating wavelength arranged, can be arranged one and initiate time delay in the way of taking stepping, according to a step-length preset, gradually changes time delay, to carry out wavelength measurement;Or, according to the natural wavelength of default fiber grating, from the beginning of minimum wavelength or maximum wavelength, according to the wavelength length of the fiber grating of the setting stored, carry out the delays time to control of correspondence one by one, to realize wavelength measurement.
Having the beneficial effect that of the technique scheme of the present invention:
1, can realize the different section optical fiber in unit cable are effectively identified, and accuracy of identification is high, can automatically identify the optical cable information of correspondence, substantially increase accuracy of identification;
2, identify that capacity is big, the identification to different branch, and the identification of the optical fiber to sections different on each branch road can be taken into account;
3, identify equipment without increasing extra third party, in the case of being effectively improved accuracy of identification, be greatly saved cost.
Accompanying drawing explanation
Fig. 1 is the system structure schematic diagram of the embodiment of the invention;
Fig. 2 is the optical cable evaluator structural representation of the embodiment of the invention.
Wherein:
Being labeled as in Fig. 1:
1-wideband light source, 2-beam splitter, 3-detector, 4-photoswitch 1,5-bonder, 6-optical cable, 7-optical cable evaluator, 8-photoswitch 2,9-FBG (FBG) demodulator, 10-central controller.
Being labeled as in Fig. 2:
21-optical cable, 22-fiber grating.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, it is described in detail below in conjunction with the accompanying drawings and the specific embodiments.Those skilled in the art should know, following specific embodiment or detailed description of the invention, be the present invention be that the set-up mode of series of optimum that concrete summary of the invention enumerate is explained further, and all can be combined with each other or interrelated use between those set-up modes, cannot be associated arranging or being used in conjunction with other embodiment or embodiment unless clearly proposed some of which or a certain specific embodiment or embodiment in the present invention.Meanwhile, following specific embodiment or embodiment are only used as optimized set-up mode, and not as limiting the understanding of protection scope of the present invention.
Below by way of each specific embodiment, it is available for the present invention being preferred embodiment described in detail.Each design parameter numerical value involved in each specific embodiment below, is only used as enumerating and use, to facilitate the explanation to embodiment of the present invention, is not intended as the restriction of scope.
It is to be understood that, this specification, accompanying drawing or the first photoswitch described in claims are above-mentioned photoswitch 1, and the second photoswitch is above-mentioned photoswitch 2, they equal corresponding same functional part or functional devices.
Embodiment 1
In a specific embodiment, as it is shown in figure 1, the optical cable intelligent identifying system of present invention proposition and the recognition methods of correspondence thereof, can realize in following example mode:
This system includes at least one wideband light source (1), beam splitter (2), detector (3), first photoswitch/photoswitch 1 (4), bonder (5), optical cable (6), optical cable evaluator (7), second photoswitch/photoswitch 2 (8), FBG (FBG) demodulator (9), central authorities' demodulator (10).
Signal wavelength in view of transmission is 1550nm, and in order to avoid affecting signal transmission, therefore the centre wavelength of the light source that this wideband light source (1) uses is 1590nm, and output is at about 20mW.It is the most stable in order to monitor light source that beam splitter (2) is used to the light separating a part of light source, and splitting ratio is 90:10, and centre wavelength is 1590nm;Detector (3) is the light that detection optical splitter separates, and responsing center's wavelength is 1590nm, due to be detection be direct current, therefore responsive bandwidth is only 3MHz;First photoswitch/photoswitch 1 (4) is the light source that DC light source is modulated into pulse output, and pulsewidth is 20ns, and pulse frequency is 20KHz;The effect of bonder (5) is that light source is optically coupled into optical cable, the wherein a length of 1590nm of cardiac wave;Optical cable (6) is working media, messenger light 1550nm and test light 1590nm, a length of 20km;Optical cable evaluator (7) is used to carry out the Primary Component of optical cable identification, it is to be made up of one group of fiber grating group in the present invention, as in figure 2 it is shown, according to the theoretical analysis of above summary of the invention and discussion, the fiber grating used in the design have employed the scheme of three fiber gratings, centre wavelength is respectively 1589nm, 1590nm, 1591nm, and through calculating, in order to distinguish the position of each fiber grating, employing be spaced apart 1cm;Second photoswitch/photoswitch 2 (8) is used to detection fiber optical grating reflection pulse, and parameter obtains the same with the first photoswitch/photoswitch 1 (4);FBG (FBG) demodulator is used to demodulating fiber bragg grating wavelength, and through calculating and optimizing, the parameter used in native system is: wave-length coverage 1585nm-1625nm, absolute wavelength precision 40pm, Power Dynamic Range 30dBm, rate of scanning 2.5Hz, wavelength resolution 1pm;Central controller uses the Arm plate with Stm32 as core, it is possible to receive the signal from FBG (FBG) demodulator, is simultaneously emitted by control signal and controls the time delay of two photoswitches.
Embodiment 2
The cardinal principle of the present invention be by optical cable implant fiber grating group, by the identification to fiber grating characteristic parameter thus constitute optical cable evaluator.As shown in Figure 2, a kind of optical cable evaluator structure being in the present invention one specific embodiment, wherein 21 is optical cable, 22 is multiple fiber gratings that spacing is L, the wavelength of fiber grating could be arranged to different, may be alternatively provided as identical or part is identical, as long as the mode of coding can be realized, all go in the present embodiment.nullSpecifically,Described optical cable evaluator is formed by implanting single or multiple fiber grating in optical cable fibre core,Optical cable evaluator is one preferred embodiment herein,Those skilled in the art it will be clear that,The optical cable fibre core of any structure of fiber grating can be implanted,All can be as an optical cable evaluator,And,This optical cable evaluator can be the extra device added in optical cable,Such as at the seam etc. of one section of optical fiber,Can also be at the beginning of optical cable produces,The one or more fiber gratings being just scribed in optical cable are constituted,I.e.,This optical cable evaluator can be produce at the beginning of be just integrally with optical cable,Can also be that additional devices is connected in optical cable be formed,It is not limited with said structure,Enable to fiber grating embed or in access optical cable fibre core,To form any prior art of reflection light,All can be applicable to this,And within all should being contemplated as falling within protection scope of the present invention.
The fiber grating parameter paid close attention in the present invention mainly has following: the central wavelength lambda of fiber grating, the position Z in optical cable, the space length L of fiber grating, fiber grating reflected energy E.
If setting the degree of freedom of each variable as N (λ), N (Z), N (L) and N (E), then the power system capacity that system is overall is Ns: Ns=N (λ) × N (Z) × N (L) × N (E).Being not difficult to find out from here, the resolution improving each dimension can effectively improve the capacity of system, but the resolution of each dimension is impossible to infinitely small, can be limited by several factors.
If the light energy distribution setting incident illumination is the function of wavelength X as E (λ), this power.A (λ) is the loss factor of forward-propagating unit length, and light energy E (z, λ) at z the most to be measured is:
E ( z , λ ) = E ( λ ) exp [ - ∫ 0 z a ( x , λ ) d x ] - - - ( 1 )
If reflecting at the fiber grating that optical signal is at z, then the light energy of the fiber grating that input receives is:
E ( z , λ g ) = r ( z , λ g ) E ( λ g ) exp [ - ∫ 0 z d ( x , λ g ) d x ] = r ( z , λ g ) E ( λ g ) exp [ - ∫ 0 z a ( x , λ g ) d x ] exp [ - ∫ 0 z d ( x , λ g ) d x ] - - - ( 2 )
Wherein E (λ) is the light energy spectrum density of incident illumination, and this can be adjusted according to the requirement of system, such as, design from light source design or wave filter and be adjusted;a(x,λg) it is the loss factor of forward-propagating unit length, r (z, λg) it is reflection coefficient, d (x, λ) is back-scattering light unit length attenuation quotient, and these three parameter is all the parameter relevant with wavelength and locus, and concrete numerical value can consult pertinent literature of the prior art.
According to (2) formula, it can be seen that the energy signal that FBG (FBG) demodulator receives mainly is affected by several respects factor:
The most tested pilot position Z affects, and test point position distance is the most remote, and the signal received is the least;
2. by E (λg) impact, namely composed by light source light energy and affected;
3. by a (x, λg) and d (x, λg) impact, in the case of conventional.This is mainly affected by Rayleigh scattering, and Rayleigh scattering is relevant with wavelength, and its scattered light intensity is that the biquadratic with incident wavelength is inversely proportional to;
4. when assuming E (λg) and loss constant in the case of, the signal that each fiber grating receives is approximated to exponential relationship.
If testing once every a delay cycle Δ t, then being equivalent to distributed n test point in optical cable, the distance between test point is L, then the position of test point is: Zi=iL.The time interval of the test point energy of reflection light then received at FBG (FBG) demodulator is:
Δ t = 2 L n ( λ s , T ) C 0 - - - ( 3 )
n(λs, T) be wavelength be λsLight, be refractive index during T in temperature, namely affected by wavelength and temperature.Wherein C0It is light spread speed in a vacuum, is 3 × 108m/s。
The reflection power that can calculate i-th test point according to formula above is:
P i ( z i , λ g ) = r ( z i , λ g ) P ( λ g ) exp [ - ∫ 0 z i d ( x , λ g ) d x ] = r ( z i , λ g ) P i ( λ g ) exp [ - ∫ 0 z i a ( x , λ g ) d x ] exp [ - ∫ 0 z i d ( x , λ g ) d x ] - - - ( 4 )
t c i = 2 L c i n ( λ i , T ) C 0 - - - ( 5 )
L c i = C 0 × t c i 2 n ( λ i , T ) = C 0 2 × t c i n ( λ i , T ) - - - ( 6 )
(4) about r (z, λ) in formula, (5) formula and (6) formula, P (λ), C0, the definition of a (x, λ) and d (x, λ) and (1), (2) formula is identical with (3) formula.
Formula (5) is the phase-locked time difference when measuring i-th fiber grating.The position of i-th fiber grating can be derived, as shown in formula (6) according to (5) formula.This is the positional information that the present invention resolves.From formula (6) Suo Shi, fiber position L calculatedciHaving relation with several factors, one is tci, time of namely testing, one is the dispersion n (λ of fiber gratingi)。
The test error amount that so can draw the position of i-th fiber grating according to formula (6) is:
dL c i = C 0 2 × d ( t c i n ( λ i , T ) ) = C 0 2 × ( dt c i n ( λ i , T ) - t c i n ( λ i , T ) 2 d n ( λ i , T ) ) - - - ( 7 )
The most here test error and two factors are relevant, dtciAnd dn (λi, T), and dn (λi, T) again with λiAnd temperature T-phase pass.This explanation needs the measurement time error reducing two photoswitches to reduce dt test whenci, simultaneously need to improve the precision of FBG (FBG) demodulator.The margin of error and the system that calculate here are also relevant at the capacity of this dimension simultaneously, in order to distinguish the position of two fiber gratings, then the spatial separation Δ L that two fiber gratings take should be much larger than the margin of error calculated here.That is to say:
M > C 0 2 × ( dt c i n ( λ i , T ) - t c i n ( λ i , T ) 2 d n ( λ i , T ) ) - - - ( 8 )
Simultaneously from (7) formula it can be seen that when meeting (9) formula when, dLci=0
dt c i n ( λ i , T ) = t c i n ( λ i , T ) 2 d n ( λ i , T ) - - - ( 9 )
That is to say the existence due to dispersion, the position that the fiber grating of various location records is likely to be coincidence, therefore the present invention needs in view of this problem designing the spacing of fiber grating when, the refractive index of optical fiber is affected by the propagation wavelength in fiber grating and distributed temperature simultaneously, and distributed temperature is highly prone to environmental effect, so had better not obtain the least choosing fiber grating spacing when, otherwise it is highly prone to environmental effect.According to the calculating of (7th) formula, it is estimated that in the range of the fiber bragg grating center wavelength of Systematic selection, such as from (λ1To λn), temperature is from (T1To TnThe volume of data of the test error of two wavelength in the range of), finds the maximum dL of this arrayci(max), then taking optical cable grating space when, just should be more than dLci(max), that is to say:
Δ L=max (dL1,dL2,···dLn)
dL i = C 0 2 × ( dt c i n ( λ i , T i ) - t c i n ( λ i , T i ) 2 d n ( λ i , T i ) ) - - - ( 10 )
In formula (10), dLiFor the measurement error value calculated under i-th group of parameter.
Requirement analysis based on above-mentioned fiber grating spatial separation, in in particular embodiments, optical cable intelligent identification Method specifically may be accomplished by, the method is applicable in an identification system, and this system includes at least one high power stability light source, the first photoswitch/photoswitch 1, the second photoswitch/photoswitch 2, bonder, FBG (FBG) demodulator, optical cable evaluator and demodulation of phase locking module.
In a specific embodiment, described high power stability light source is to reduce the error when testing reflected energy and a kind of light source of designing, can be made up of kinds of schemes.
High power stability light source and the first photoswitch/photoswitch 1 are connected, first photoswitch/photoswitch 1 light modulation of light source is become required for characteristic, such as pulsewidth, the parameter such as repetition rate and waveform, enter in bonder through the light of ovennodulation, be then connected in optical cable to be measured by bonder.Wideband light source herein can arrange multiple, complexity according to concrete system and the feature of light source or wavelength requirement etc. are arranged, the most only need the situation etc. of the light of one or more specific wavelength, in addition, this high power stability light source multiple can also be set, can arrange according to the needs of whole optical cable identification system, be not limited thereto herein.
In a specific embodiment, mensuration for stop position is carried out by demodulation of phase locking module, and in this module, the first photoswitch/photoswitch 1 is the device controlling light source outgoing pulse, light source can be carried out impulse modulation, obtain the light pulse of one group of Parameter adjustable.Second photoswitch/photoswitch 2 is the device that the light to reflection and scattering carries out selecting to receive, and selects the light after receiving could enter FBG (FBG) demodulator through the second photoswitch/photoswitch 2 and is demodulated.The two photoswitch can carry out Synchronization Control simultaneously.Owing to identification to optical cable needs to judge the centre wavelength of optical fibre in optical cable grating, so needing to be identified the centre wavelength of fiber grating in the present system.And the intensity of the different wave length being identified by receiving of the centre wavelength of fiber grating is judged, therefore this is i.e. the intensity locking of fiber bragg grating center wavelength, concrete methods of realizing is that the intensity of the wavelength of the reflection light demodulating FBG (FBG) demodulator judges, owing to fiber grating is a strong reflection spot in optical cable, therefore its reflection light will be spectrally a spike, therefore can set some energy threshold Pth, then to the spectral power P demodulatedi(zig) and PthJudge, work as Pi(zig) more than PthTime, then λ nowgIt is exactly the centre wavelength of fiber grating, and z nowiThat is to say the position of fiber grating, and Zi=iL, in conjunction with formula (5), it is possible to be determined by the time delay t of two photoswitchesciObtain the position of fiber grating.
Wavelength strength locking can be in the way of taking stepping, i.e. according to the optic fiber grating wavelength arranged, arrange one and initiate time delay, according to a step-length preset, gradually change time delay, to carry out wavelength measurement, can also be according to the natural wavelength of default fiber grating, from the beginning of minimum wavelength or maximum wavelength, according to the wavelength length of the fiber grating of the setting stored, carry out the delays time to control of correspondence one by one, to realize wavelength measurement.
In a specific embodiment, demodulation of phase locking module is to have central controller, and the first photoswitch/photoswitch 1 and the second photoswitch/photoswitch 2 and FBG (FBG) demodulator are constituted.Concrete mode of operation is to feed back in central control module by the signal of FBG (FBG) demodulator, and central controller can control the time delay of two photoswitches, carry out judging that whether the signal of FBG (FBG) demodulator produced by this time delay is the signal that fiber grating is fed back by central controller.Thus realize feedback control, carry out delay locked.
In a specific embodiment, described demodulation of phase locking module includes the second photoswitch/photoswitch 2, FBG (FBG) demodulator and central controller, FBG (FBG) demodulator is wavelength and the intensity demodulating reflection light, it 2 is the time delay demodulating the light pulse that receives relative to incident light pulse that second photoswitch/light opens the light, these three parameter is sent to central controller, and these parameters and the parameter demarcated in the past are compared by central controller, thus find the numbering of optical cable in data base.According to the parameter to the described fiber grating detected in optical cable, i.e. can identify which fiber grating specifically detect be, such that it is able to know its optical fiber being subordinate to, and the details that optical fiber is corresponding.As for how identification information to be carried out corresponding storage in data base with optical cable information; so that search is searched; it is then that those skilled in the art can realize in conjunction with the conventional method in data processing field; such as; one_to_one corresponding storage is carried out according to parameter, fiber grating, optical cable title or optical cable numbering; can also be the corresponding optical cable title of parameter or the optical cable numbering of two or more fiber grating; the coding i.e. formed with multiple fiber gratings; corresponding optical cable or a fiber segment etc., the most not as the restriction of scope.
The above is the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, on the premise of without departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.

Claims (11)

1. an optical cable intelligent identifying system, it is characterised in that described system includes high power stability light source, demodulation of phase locking module, bonder, optical cable, optical cable evaluator;
Described demodulation of phase locking module, for being measured fiber position, comprises central controller, FBG (FBG) demodulator, photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light);
Described central controller receives the feedback signal of FBG (FBG) demodulator, and described central controller is connected with photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light) respectively;
Described high power stability light source is connected with photoswitch 1 (the first photoswitch), and photoswitch 1 (the first photoswitch) is for being modulated the emergent light of high power stability light source;
Described photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light) are connected with bonder respectively;
Described optical cable evaluator is formed by implanting single or multiple fiber grating in optical cable fibre core.
System the most according to claim 1, it is characterized in that: described high power stability light source comprises wideband light source, beam splitter and detector, described wideband light source is connected with beam splitter, and described beam splitter is connected with photoswitch 1 (the first photoswitch), detector respectively;
And result of detection is fed back to wideband light source by described detector.
System the most according to claim 1, it is characterized in that: in described demodulation of phase locking module, central controller, by regulation described photoswitch 1 (the first photoswitch), the time delay of photoswitch 2 (the second light opens the light), carries out output light wavelength intensity locking.
System the most according to claim 3, it is characterized in that: described demodulation of phase locking module demodulates the reflection light from fiber grating by FBG (FBG) demodulator, and obtaining the parameter of described reflection light, described parameter at least includes the wavelength of fiber grating, the locus of fiber grating, reflected energy.
System the most according to claim 3, it is characterized in that: use the laser diode of band power detection as above-mentioned light source, described laser diode separate a part of light as detection light, from certain pin of laser diode read this detection light numerical value, then carry out power detection feedback control.
6. an optical cable intelligent identification Method, is applied to optical cable identification system, and described system includes high power stability light source, demodulation of phase locking module;Described demodulation of phase locking module comprises central controller, FBG (FBG) demodulator, photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light), optical cable to be measured, and at least one fiber grating being arranged in described optical cable;Described central controller is connected with photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light) respectively;Described high power stability light source is connected with photoswitch 1 (the first light opens the light);It is characterized in that:
The time delay of described central controller controls photoswitch 1 (the first photoswitch), in order to regulate the parameter of the high power stability light source emergent light being connected with photoswitch 1 (the first light opens the light), described parameter at least includes the one in pulsewidth, repetition rate, waveform;
Described central controller regulation photoswitch 1 (the first photoswitch), the time delay of photoswitch 2 (the second light opens the light), carry out Wavelength strength locking, and when being locked by intensity, the time delay of two photoswitches is to determine fiber grating position.
Method the most according to claim 6, it is characterized in that: described FBG (FBG) demodulator receives the reflection light from described fiber grating by photoswitch 2 (the second light opens the light), and this reflection light is demodulated, to feed back in central controller according to the reflection signal that obtains of light, it is achieved the feedback control that central controller is delay locked to photoswitch 1 (the first photoswitch), photoswitch 2 (the second light opens the light).
Method the most according to claim 6, it is characterized in that: the parameter after reflection light is demodulated by described FBG (FBG) demodulator sends to central controller, central controller is by comparing described parameter with the parameter demarcated, identify corresponding fiber grating, and in data base, search for the optical cable numbering corresponding with this fiber grating.
Method the most according to claim 6, it is characterised in that: prestore in data base the fiber grating parameter demarcated, and by corresponding with optical cable numbering for described parameter storage;
Described parameter at least includes any one in optic fiber grating wavelength, fiber grating locus, reflected energy these three parameter.
Method the most according to claim 6, it is characterized in that: the position that described fiber grating is arranged should be chosen at the centre of optical cable as far as possible, avoiding end face reflection to bring impact to demodulation, the spacing of described fiber grating should be more than the maximum of the demodulating error caused by the change of temperature and centre wavelength.
11. methods according to claim 6, it is characterised in that:
Wavelength strength locking i.e. according to the optic fiber grating wavelength arranged, can be arranged one and initiate time delay in the way of taking stepping, according to a step-length preset, gradually changes time delay, to carry out wavelength measurement;Or, according to the natural wavelength of default fiber grating, from the beginning of minimum wavelength or maximum wavelength, according to the wavelength length of the fiber grating of the setting stored, carry out the delays time to control of correspondence one by one, to realize wavelength measurement.
CN201610153330.3A 2016-03-17 2016-03-17 System and method of intelligently recognizing optical cable CN105823494A (en)

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CN107167872A (en) * 2017-05-05 2017-09-15 薛鹏 Fiber grating code set knows method for distinguishing
CN108519219A (en) * 2018-04-18 2018-09-11 中山水木光华电子信息科技有限公司 A kind of system apart from self-adapting estimation optical fiber code
CN108534989A (en) * 2018-04-18 2018-09-14 中山水木光华电子信息科技有限公司 A kind of method of optical cable intelligent recognition
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CN107167872A (en) * 2017-05-05 2017-09-15 薛鹏 Fiber grating code set knows method for distinguishing
CN108519219A (en) * 2018-04-18 2018-09-11 中山水木光华电子信息科技有限公司 A kind of system apart from self-adapting estimation optical fiber code
CN108534989A (en) * 2018-04-18 2018-09-14 中山水木光华电子信息科技有限公司 A kind of method of optical cable intelligent recognition
CN108592958A (en) * 2018-04-18 2018-09-28 中山水木光华电子信息科技有限公司 A kind of identifying system of the short distance optical fiber code of identical coding unit
CN108680193A (en) * 2018-04-18 2018-10-19 中山水木光华电子信息科技有限公司 A kind of optical fiber code recognition methods based on light splitting matrix demodulation
CN108833001A (en) * 2018-04-18 2018-11-16 中山水木光华电子信息科技有限公司 A kind of optical fiber code identifying system based on tunable optical source
CN108810673A (en) * 2018-05-22 2018-11-13 中山水木光华电子信息科技有限公司 A method of the optical-fibre channel based on optical fiber code automatically selects
CN108880684A (en) * 2018-05-22 2018-11-23 中山水木光华电子信息科技有限公司 A method of the identification of full light and operation based on optical fiber code
CN108880689A (en) * 2018-05-22 2018-11-23 中山水木光华电子信息科技有限公司 A kind of fiber optic communication encryption method based on optical fiber code
CN108880684B (en) * 2018-05-22 2020-12-15 中山水木光华电子信息科技有限公司 All-optical recognition and operation method based on optical fiber coding
CN108810673B (en) * 2018-05-22 2021-02-19 中山水木光华电子信息科技有限公司 Optical fiber channel automatic selection method based on optical fiber coding
CN109525307A (en) * 2018-10-30 2019-03-26 中国电力科学研究院有限公司 One kind realizing the binary-coded method and system of optical fiber based on physics breakpoint
WO2020215518A1 (en) * 2019-04-22 2020-10-29 中山水木光华电子信息科技有限公司 Narrowband light wave-based rapid optical fiber code recognition system and recognition method

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