CN107515100B - A kind of pulsed light fiber switch condition detecting system - Google Patents
A kind of pulsed light fiber switch condition detecting system Download PDFInfo
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- CN107515100B CN107515100B CN201710698365.XA CN201710698365A CN107515100B CN 107515100 B CN107515100 B CN 107515100B CN 201710698365 A CN201710698365 A CN 201710698365A CN 107515100 B CN107515100 B CN 107515100B
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Abstract
The present invention relates to fiber switch technical fields, provide a kind of pulsed light fiber switch condition detecting system.In detection system, the timer, pulsed light occur module, optical circulator and fiber switch sensing network and are sequentially connected, pulsed light occurs module and is also connected with data acquisition module, the first port of optical circulator, second port and third port are separately connected pulsed light and module, fiber switch sensing network and optical detector occur；The input port of the delivery outlet connection pulse electrical signal filter amplification circuit module of optical detector；The output port of pulse electrical signal filter amplification circuit module connects data acquisition module, wherein the output port series connection parsing module of data acquisition module；The output port of parsing module connects memory.The present invention solves the technical problem for being difficult to find that enough communications equipment rooms dispose the signal resolution equipment for handling reflected light signal nearby, simplifies detection network system, improves the efficiency of detection system dimension.
Description
[technical field]
The present invention relates to fiber switch technical fields, more particularly to a kind of pulsed light fiber switch condition detecting system.
[background technique]
Fiber cable cross connection box is to provide the handover equipment of optic fiber distribution, jumper connection for main dried layer optical cable, wiring layer optical cable.Optical cable draws
After entering fiber cable cross connection box, after fixation, termination, with fibre, trunk layer optical cable is connected to wiring layer optical cable using jumping fiber.It is led
It is used to connect backbone optical cable and branched cable in fiber optic cable communications network, termination protection, connection and scheduling is carried out to optical cable, optical fiber
The distribution plant of management.
With the popularization of Optical Fiber Subscriber Access Network (Fiber-to-the-x writes a Chinese character in simplified form are as follows: FTTx) technology, Various types of data business
Extension, operator be largely arranged in city fiber cable cross connection box for fiber cable network access.But most of optical cable joining
Case is mounted on outdoor, is again the mute resource for carrying a large amount of important services in case, as inactive component, longtime running is outdoors, more
The peripheral environment of change causes potential threat to the safe operation of fiber cable cross connection box, maintenance personnel can not distally be managed and
Monitoring is a very serious and urgent problem to be solved.This is because a large amount of fiber cable cross connection box is all that optical fiber passive connects
Branch distributor case, fiber cable cross connection box are dispersed in each corner in city, can not accomplish the access and management of power supply, therefore general
Electric transducer can not be applied.There is operator to design and develop the cross-connecting box management system of solar energy and battery, it is still, this kind of
Equipment investment cost is high, and operation maintenance cost is also high, thus is difficult to popularize.Because fiber cable cross connection box is by unauthorised broken, accident
Damage and caused by fiber-optic signal failure have resulted in a large amount of O&M of operator and traffic lost, it is serious or even cause political affairs
Control influence.Therefore, the safety for ensureing cross-connecting box is the most important condition that Logistics networks last one kilometer can be unobstructed.
In order to ensure the safety of cross-connecting box, objectively need a kind of chamber door that can detecte fiber cable cross connection box on and off
Technological means and sensing equipment, to judge whether fiber cable cross connection box is illegally opened, still, fiber cable cross connection box for optical fiber jump
Fibre does not provide power supply.So objectively requiring the switch sensor is inactive component.The door opening or closing shape that sensing equipment is detected
State amount is also required to pass to background system in the case of not powering.For this purpose, Publication No. CN205861075U and
The Chinese patent application of CN205861076U disclose a kind of reflective switch sensor (as shown in Figs. 1-3) based on optical fiber with
A kind of transmission-type switch sensor based on optical fiber, using the light beam reflected light on-off in the sensor that DC light source issues come
Express the open and-shut mode of sensor.The door leaf that these two types of switch sensors have been applied in distributing box of communication optical cable is opened, is closed
In sensing, by reflective and two kinds of sensors of transmission-type combination, the multiple leaf door page to more fiber cable cross connection boxes may be implemented
Monitoring.
But for the signal resolution equipment for handling reflected light signal can only by the presence of reflected light in optical fiber with
The no door leaf open and-shut mode to judge single fiber optic cable cross-connecting box, i.e. single fiber optic cable cross-connecting box correspond to a signal resolution equipment, this
It results in needing to complete using a large amount of idle fiber resources to multiple fiber cable cross connection box door leaf open and-shut modes in practical application
Monitoring, and then the deployment of optical fiber sensing system is caused to may cause the reduction of telecom operators' fiber optic network dilatation ability.This
Outside, fiber cable cross connection box is generally along optical cable tunnel-type at tandem semicircular configuration.Due to base station equipment size reduction in recent years,
Communications equipment room becomes fewer and fewer, causes to be difficult to find that enough communications equipment rooms are disposed nearby for handling reflection now
The signal resolution equipment of optical signal.
In consideration of it, overcoming defect present in the prior art is the art urgent problem to be solved.
[summary of the invention]
The technical problem to be solved by the present invention is to the networking monitoring using less fiber resource to multiple fiber cable cross connection boxes
Function, solve since communications equipment room is less, it is difficult to find enough communications equipment rooms and be disposed nearby for handling reflected light
The technical problem of the signal resolution equipment of signal.
The present invention adopts the following technical scheme:
In a first aspect, detection system includes: timing the present invention provides a kind of pulsed light fiber switch condition detecting system
Module, optical circulator, fiber switch sensing network, optical detector, pulse electrical signal filter amplification circuit mould occur for device, pulsed light
Block, data acquisition module, parsing module and memory；Wherein, module, optical circulator and light occur for the timer, pulsed light
Fine switch sensing network is sequentially connected, and pulsed light occurs module and is also connected with data acquisition module, the first port of optical circulator,
Second port and third port are separately connected the pulsed light and module, fiber switch sensing network and optical detector occur；
The delivery outlet of the optical detector connects the input port of the pulse electrical signal filter amplification circuit module；
The output port of the pulse electrical signal filter amplification circuit module connects the data acquisition module, wherein institute
State the output port series connection parsing module of data acquisition module；
The input port and output port of the parsing module are also connected with the memory.
Preferably, the ring of light is walked to being followed successively by first port, second port and third port in the optical circulator.
Preferably, each fiber switch junction sensor includes sensor body, fiber reel in fiber switch sensing network
Fine box, fiber splitter, the first optical fiber collimator, the second optical fiber collimator, movable slider and elastic component, first optical fiber are quasi-
Straight device and the accommodating of second optical fiber collimator interval set distance are positioned in the sensor body, and first optical fiber
Collimator and second optical fiber collimator realize Gaussian Beam Coupling；Higher level's optical fiber is after the first port from the optical fiber
The fiber entrance of fiber management tray penetrates and after disk fibre setting length, is pierced by from the fiber outlet of the optical fiber fiber management tray, then accesses
The input terminal of the fiber splitter；The fiber splitter passes through the input terminal of an output end and first optical fiber collimator
Connection, the fiber splitter are connect by an output end with the junior's optical fiber accessed through the third port；Second light
The output end of fine collimator is connect with the local fiber accessed through the second port；There is light passing in the middle part of the movable slider
Hole, the movable slider are set between first optical fiber collimator and second optical fiber collimator, and can be in the sensing
Sliding in device ontology, makes the light hole be connected to first optical fiber collimator and second optical fiber collimator, constitutes optical path
Light passing；Or the light hole is made to be staggered first optical fiber collimator and second optical fiber collimator, it constitutes optical path and blocks,
The elastic component is folded between the movable slider and sensor body.
Preferably, the timer is used to staggeredly be spaced t1 trigger pulse light generation module according to sampling and issues forward pulse
Light；
Pulsed light occurs module and is also used to issuing forward pulse light simultaneously, and trigger data acquisition module starts data and adopts
Sample.
Preferably, the pulse signal form of the forward pulse light is square-wave signal, and the data acquisition module is used for
The leading edge position triggering of the pulse electrical signal starts data sampling.
Preferably, the pulsewidth w of the forward pulse light is less than or equal to 3 microseconds, the sampling frequency of the data acquisition module
Rate F is greater than or equal to 2 times of obtained parameter values by 1 second quotient divided by the pulsewidth.
Preferably, the data acquisition module be used for receive it is described start sampling instruction after with sample frequency F with adopt
Sample duration t2 acquisition obtains the data of current sample period backwards to pulsed optical signals, wherein the sampling duration t2 is adopted with described
Sample frequency F is preset value；
The sampling duration t2 of the data acquisition module, which is greater than to be issued to from a forward pulse optical signal, receives last
A duration between pulsed optical signals.
Preferably, the value of the sampling duration t2 also meets: 0.05ms≤t2≤1ms；Wherein, fiber switch node senses
The round-trip optical path distance that device and pulsed light generation module and optical detector are constituted is between 5km to 100km.
Preferably, the pulse light generator can be also used for issuing direct current light, and the direct current light is examined for optical fiber
The light loss of switch sensing network backbone.
Preferably, institute between the optical circulator and pulsed light generation module, fiber switch sensing network and optical detector
The optical fiber used be G.652D, G.652C, G.652B or G.652A, the pulsed optical signals that the pulse light generator issues
Central wavelength is 1310nm or 1550nm.
Second aspect, the present invention also provides a kind of pulsed light fiber switch condition detecting system, detection system includes: fixed
When device, pulsed light occur module, optical circulator, fiber switch sensing network, optical detector, pulse electrical signal filter amplification circuit
Module, data acquisition module, parsing module and memory；Wherein, the timer, pulsed light occur module, optical circulator and
Fiber switch sensing network is sequentially connected, and timer is also connected with data acquisition module, the first port of optical circulator, second end
Mouth and third port are separately connected the pulsed light and module, fiber switch sensing network and optical detector occur；
The delivery outlet of the optical detector connects the input port of the pulse electrical signal filter amplification circuit module；
The output port of the pulse electrical signal filter amplification circuit module connects the data acquisition module, wherein institute
State the output port series connection parsing module of data acquisition module；
The input port and output port of the parsing module are also connected with the memory.
Preferably, the timer is used to staggeredly be spaced t1 trigger pulse light generation module according to sampling and issues forward pulse
Light；
The timer is also used to trigger data acquisition module and starts data sampling.
Preferably, the pulse signal form of the forward pulse light is square-wave signal, and the data acquisition module is used for
The leading edge position triggering of the pulse electrical signal starts data sampling.
Preferably, the pulsewidth w of the forward pulse light is less than or equal to 3 microseconds, the sampling frequency of the data acquisition module
Rate F is greater than or equal to 2 times of obtained parameter values by 1 second quotient divided by the pulsewidth.
Preferably, the data acquisition module be used for receive it is described start sampling instruction after with sample frequency F with adopt
Sample duration t2 acquisition obtains the data of current sample period backwards to pulsed optical signals, wherein the sampling duration t2 is adopted with described
Sample frequency F is preset value；
The sampling duration t2 of the data acquisition module, which is greater than to be issued to from a forward pulse optical signal, receives last
A duration between pulsed optical signals.
Switch state detecting system based on pulsed light fiber switch sensing node proposed by the invention obtains to pass through
The position of the order of sensing node, number and its peak value of pulse sample data sequence during the sampling period in sensing network, from
And shape is switched according to the accurate predicate node of sequence node according to backwards to pulsed light and its pulsed light peak strength, timing and time slot
State provides possible realization framework.It solves and is difficult to find that enough communications equipment rooms are disposed nearby for handling reflected light
The technical problem of the signal resolution equipment of signal, simplifies detection network system, improves the efficiency of detection system dimension, and drops
Low maintenance cost.
[Detailed description of the invention]
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described.It should be evident that drawings described below is only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the structural representation that existing a kind of fiber switch sensor provided in an embodiment of the present invention is in closed state
Figure；
Fig. 2 is existing a kind of structural representation that fiber switch sensor is in the open state provided in an embodiment of the present invention
Figure；
A kind of Fig. 3 existing backlight pulse light fiber switch sensor structure schematic diagram provided in an embodiment of the present invention；
Fig. 4 is a kind of pulsed light fiber switch condition detecting system configuration diagram provided in an embodiment of the present invention；
Fig. 5 is another pulsed light fiber switch condition detecting system configuration diagram provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of fiber switch junction sensor provided in an embodiment of the present invention；
Fig. 7 is a kind of structure under another state of fiber switch junction sensor provided in an embodiment of the present invention
Schematic diagram；
Fig. 8 is the structural schematic diagram of another fiber switch junction sensor provided in an embodiment of the present invention；
Fig. 9 is a kind of configuration diagram of fiber switch sensing network provided in an embodiment of the present invention；
A kind of Figure 10 pulsed light fiber switch condition detection method flow diagram provided in an embodiment of the present invention；
The refinement of step 201 is real in a kind of Figure 11 pulsed light fiber switch condition detection method provided in an embodiment of the present invention
Existing flow chart；
A kind of Figure 12 pulsed light fiber switch condition detection method flow diagram provided in an embodiment of the present invention；
Figure 13 another pulsed light fiber switch condition detecting system configuration diagram provided in an embodiment of the present invention；
Figure 14 another pulsed light fiber switch condition detecting system configuration diagram provided in an embodiment of the present invention；
In conjunction with attached drawing, make the following instructions:
1, sensor body；2, optical fiber；3, collimator；4, movable slider；41, light hole；5, light reflecting element；6, elastic
Part；7, rubber bushing.
[specific embodiment]
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In the description of the present invention, term "inner", "outside", " longitudinal direction ", " transverse direction ", "upper", "lower", "top", "bottom" etc. refer to
The orientation or positional relationship shown be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description the present invention rather than
It is required that the present invention must be constructed and operated in a specific orientation, therefore it is not construed as limitation of the present invention.
In addition, as long as technical characteristic involved in the various embodiments of the present invention described below is each other not
Constituting conflict can be combined with each other.
Embodiment 1:
The embodiment of the present invention 1 provides a kind of pulsed light fiber switch condition detecting system, as shown in figure 4, detection system
It include: timer, pulsed light generation module, optical circulator, fiber switch sensing network, optical detector, pulse electrical signal filtering
Amplification circuit module, data acquisition module, parsing module and memory；Wherein, module, light occur for the timer, pulsed light
Circulator and fiber switch sensing network are sequentially connected, and pulsed light occurs module and is also connected with data acquisition module, for receiving
To timer triggering generate forward pulse optical signal while, can to data acquisition module send acquisition data command, from
And enable in each round detection process by data acquisition module the timing of collected backlight pulse signal reach height
It is consistent.The first port of optical circulator, second port and third port are separately connected the pulsed light generation module, optical fiber is opened
Close sensing network and optical detector；The ring of light is walked to being followed successively by first port, second port and third end in the optical circulator
Mouthful.
The delivery outlet of the optical detector connects the input port of the pulse electrical signal filter amplification circuit module；
The output port of the pulse electrical signal filter amplification circuit module connects the data acquisition module, wherein institute
State the output port series connection parsing module of data acquisition module；In the concrete realization, the parsing module usually can be by
It denoises module and delustring identification module is constituted, the input port and output port of the parsing module are also connected with the memory.
Wherein, the parsing module (specifically can be above-mentioned delustring identification module) stores previous sampling period data, institute
It states parsing module to be used for after obtaining fiber switch junction sensor pulse peak positions in memory, after the denoising
Each fiber switch in the current period sampled data and previous sampling period data of (can specifically be completed by the denoising module)
The numerical value of node sensing node pulse peak positions seeks difference, if difference is less than or equal to the light in previous sampling period data
10 of the data of fine switch sensing node pulses peak position maintain the state of fiber switch junction sensor constant,
10 if more than the data of the fiber switch sensing node pulse peak positions in previous sampling period data change
The state of fiber switch junction sensor and the state recording for modifying the fiber switch junction sensor in a reservoir.Wherein,
10 are only intended to the exemplary parameter values illustrated, can be adjusted according to the actual situation during specific implementation
It is whole, and tested and tested by multiple groups, so that the judging result accuracy of set percentage is high as far as possible.
The switch state detecting system based on pulsed light fiber switch sensing node that the embodiment of the present invention is proposed, is logical
Cross the position for obtaining order, number and its peak value of pulse sample data sequence during the sampling period of sensing node in sensing network
It sets, to be opened according to backwards to pulsed light and its pulsed light peak strength, timing and time slot according to the accurate predicate node of sequence node
Off status provides possible realization framework.It solves and is difficult to find that enough communications equipment rooms are disposed nearby for handling instead
The technical problem for penetrating the signal resolution equipment of optical signal, simplifies detection network system, improves the efficiency of detection system dimension,
And reduce maintenance cost.Next by especially by the functional structure for each unit for forming the detection system, come further
It illustrates how to realize accurate predicate node switch state.
In embodiments of the present invention, the timer, which is used to staggeredly be spaced t1 trigger pulse light according to sampling, occurs module hair
Forward pulse light out；Pulsed light occurs module and is also used to issuing forward pulse light simultaneously, and trigger data acquisition module starts to count
According to sampling.
Wherein, it is pulse electrical signal, the data acquisition module that trigger data acquisition module, which starts the instruction of data sampling,
Started to sample by the rising edge triggering of the pulse electrical signal.Optical circulator makes forward pulse light not be emitted directly toward optical detector
While, it avoids backwards to pulsed light directive pulse light generator, reduces the loss of pulsed light in the optical path.Start data to adopt
Both the instruction of sample and forward pulse optical signal are simultaneously emitted by, so that data acquisition module is receiving beginning data sampling every time
Instruction after, the peak position backwards to pulsed optical signals of each fiber switch sensing node reflection is in each sampling period
It is kept fixed.
The embodiment of the invention also provides a preferred staggeredly interval time sections, are specifically less than 1 second.Because of optical cable
The duration of enabling or the shutdown movement of cross-connecting box is generally less than 500 milliseconds, as the sampling period number C of the storage of buffer
Value be greater than 500 milliseconds of quotient divided by sampling interval t1, buffer (refers to buffer that parsing module possesses or refers to composition parsing
The buffer that the above-mentioned delustring identification module of module possesses) can store it is multiple more than duration needed for sensing node state change
Periodic sampling data, the data stored in buffer are enough to determine to sense section caused by the enabling of fiber cable cross connection box or shutdown act
Dotted state variation.
Wherein, there are a kind of preferred implementation, the pulse signal form of the forward pulse light is square-wave signal.Cause
For rising edge and the failing edge occupied time of square-wave signal are less relative to pulsewidth, while the height electricity of square-wave pulse signal
The flat duration is longer relative to the high level lasting time of the waveform of other forms, when sample frequency is equal to 1 second divided by described
At 2 times of the quotient of pulsewidth, the height of pulse signal can be collected by falling into any one in two in pulse signal sampled points
Level energy.
In embodiments of the present invention, the data acquisition module is used to receive described start after sampling instructs with sampling
Frequency F and sampling duration t2 are acquired and are obtained the data of current sample period backwards to pulsed optical signals, wherein the sampling duration t2
It is preset value with the sample frequency F；
The sampling duration t2 of the data acquisition module, which is greater than to be issued to from a forward pulse optical signal, receives last
The duration between pulsed optical signals that a fiber switch junction sensor returns.According to above-mentioned limited way, usual situation
Under, the value of sampling duration t2 meets: 0.05ms≤t2≤1ms.
In embodiments of the present invention, the pulsewidth w of the forward pulse light is less than or equal to 3 microseconds, the data acquisition module
The sample frequency F of block is greater than or equal to 2 times of obtained parameter values by 1 second quotient divided by the pulsewidth.
Wherein, in ordinary optic fibre (its material be quartz glass), photon is propagated in the form of total reflection, therefore from one
The propagation of the other end is held to will appear delay, speed can reduce, about 2/3rds of vacuum light speed, about 200000km/s,
Pulsewidth may cause two that two sensor node of the spacing less than 300m reflects and generate letter backwards to pulsed light when being greater than 3 microsecond
Number overlapping so that the present invention be difficult to differentiate between different sensing nodes backwards to pulsed optical signals the high level in time-domain signal
The position in section, pulsewidth can make the sensing node minimum spacing of system reach 300m less than 3 microseconds, meet more in application
The demand of the number practical spacing of optical cross box (and in actual mechanical process, can further decrease sensing section by improving sample frequency
Distance between point, details are not described herein).In embodiments of the present invention, for each light in the fiber switch sensing network of composition
Fiber switch junction sensor in cable distributing box can be structure as shown in FIG. 6, also will be from various embodiments of the present invention
The light that light source side issues is known as forward pulse light, and is known as by the reflected light of fiber switch junction sensor backwards to arteries and veins
It washes off.
In embodiments of the present invention, the pulse light generator can be also used for issue direct current light, the direct current light by with
In the light loss for checking fiber switch sensing network main line.Since there are a large amount of optical fiber couplings for the main line of fiber switch sensing network
Chalaza, the coupling mass of these Coupling points determine loss of the optical signal in main line, the direct current issued by pulse light generator
Light can make it possible to read using light power stabilising of the light power meter to end on main line or reflection receivable end.
Module, fiber switch Sensor Network occur for optical circulator described in detection system described in the embodiment of the present invention and pulsed light
Between network and optical detector used optical fiber be G.652D, G.652C, G.652B and G.652A in it is any, accordingly
The central wavelength for the pulsed optical signals that the pulse light generator issues is 1310nm or 1550nm.
Directly adopt optical fiber communication, the loss of fiber coupling point is lower, while central wavelength be 1310nm or
The pulsed optical signals of 1550nm have the decaying of lower light energy in G.652 serial telecommunication optical fiber.
In embodiments of the present invention, as shown in fig. 6, each fiber switch junction sensor packet in fiber switch sensing network
Include: sensor body 11, optical fiber fiber management tray 12, fiber splitter 13, the first optical fiber collimator 14, the second optical fiber collimator 15,
Movable slider 16, elastic component 17, first optical fiber collimator and the accommodating of second optical fiber collimator interval set distance are fixed
In the sensor body, and first optical fiber collimator and second optical fiber collimator realize Gaussian beam coupling
It closes；Higher level's optical fiber 18 penetrates after the first port 1101 from the fiber entrance of the optical fiber fiber management tray and disk fibre setting length
Afterwards, it is pierced by from the fiber outlet of the optical fiber fiber management tray, then accesses the input terminal of the fiber splitter；The optical fibre light splitting
Device is connect by an output end with the input terminal of first optical fiber collimator, and the fiber splitter passes through an output end and warp
Junior's optical fiber 110 that the third port 1103 accesses connects；The output end of second optical fiber collimator with through described second
The local fiber 19 that port 1102 is accessed connects；There is light hole 1601, the movable slider is set in the middle part of the movable slider
It between first optical fiber collimator and second optical fiber collimator, and can slide, make described in the sensor body
Light hole is connected to first optical fiber collimator and second optical fiber collimator, constitutes optical path light passing；Or make the light passing
Hole is staggered first optical fiber collimator and second optical fiber collimator, constitutes optical path and blocks, the elastic component is folded in institute
It states between movable slider and sensor body.In this way, on two optical fiber collimators and movable slider light hole form it is stable
Optical path；The displacement of movable slider make light hole have connection or with block two states amount；When the door of monitored device, such as light
When the chamber door of cable distributing box is in off state, the exposed junction of movable slider is squeezed in, and elastic component is in compressive state, referring to figure
2, at this point, the light hole and two optical fiber collimators in the middle part of movable slider, on same straight line, optical path states are " logical ", i.e. light
Road light passing.On the contrary, the door of monitored device, such as when the chamber door of fiber cable cross connection box is in door opening state, compression elastic piece energy storage
Release, movable slider is popped up by elastic component, referring to Fig. 7, at this point, light hole and two optical fiber collimators in the middle part of movable slider are not
On same straight line, optical path is " disconnected ", i.e. optical path blocks.So far, the open and-shut mode for being monitored " door " is converted for optical path
On off operating mode.In this way, the open and-shut mode of " door " can be converted to the on-off for optical path, effectively solve each under non-transformer environment
Kind of device, equipment " door " open and-shut mode monitoring problem.
For local fiber cable cross connection box tool there are two when chamber door, fiber switch junction sensor is used for the fiber cable cross connection box one
The monitoring of door opening or closing state, local fiber cable cross connection box sensing subnet is a reflection type optical fiber switch sensor, this is reflective
Open and-shut mode of the fiber switch sensor for another chamber door of the fiber cable cross connection box monitors, and the second of fiber switch junction sensor
Optical fiber collimator is connected to reflection type optical fiber switch sensor through local fiber；Direct impulse light from higher level's optical fiber is through optical fiber
It is switched and is passed by the reflection type optical fiber after fiber management tray, fiber splitter, the first optical fiber collimator, light hole, the second optical fiber collimator
Sensor reflects to be formed backwards to pulsed light optical path.The structure and principle of reflection type optical fiber switch sensor, in patent document
It has been discussed in detail in CN205861075U, details are not described herein.
In embodiments of the present invention, if fiber cable cross connection box has a chamber door；Fiber switch junction sensor is for being somebody's turn to do
The monitoring of the fiber cable cross connection box door opening or closing state, at this point, it is opposite with fiber switch junction sensor shown in fig. 6, second
Port connects a Faraday polarization apparatus or the second optical fiber collimator of junction sensor is replaced by a light reflection mirror.Tool
The direct impulse light of input higher level's optical fiber of body is through optical fiber fiber management tray, fiber splitter, the first optical fiber collimator, light hole, the
It is reflected and is formed backwards to pulsed light optical path or direct impulse light through fiber reel by the Faraday after two optical fiber collimators
It is reflected and is formed backwards to pulsed light light by the light reflection mirror after fine box, fiber splitter, the first optical fiber collimator, light hole
Road.In this way, the presence and disappearance backwards to pulsed light optical path can express chamber door closure and open two states, that is to say, that chamber door is opened
Closed state amount can directly light passing optical fiber be transferred to signal resolution equipment, under the site environment of passive condition, monitor chamber door, cabinet
The open and-shut mode of the various structures such as door, well lid, effectively solve various devices under non-transformer environment, equipment " door " opening and closing
The monitoring problem of state.
Wherein, for when the second optical fiber collimator is replaced by a light reflection mirror, referring to the specific reality of following examples
It is existing:
Referring to Fig. 8, fiber switch junction sensor include sensor body 21, optical fiber fiber management tray 22, fiber splitter 23,
First optical fiber collimator 24, light reflection mirror 25, movable slider 26, elastic component 27 have in the sensor body and are used for higher level
The first port 2101 that optical fiber 28 accesses and the second port 2102 accessed for junior's optical fiber 29, first optical fiber collimator
It is positioned in the sensor body with the accommodating of light reflection mirror interval set distance, and in first optical fiber collimator
Axis is perpendicular to the light reflection mirror；Higher level's optical fiber penetrates simultaneously after the first port from the fiber entrance of the optical fiber fiber management tray
After disk fibre sets length, it is pierced by from the fiber outlet of the optical fiber fiber management tray, then accesses the input terminal of the fiber splitter；
The fiber splitter is connect by an output end with the input terminal of first optical fiber collimator, and the fiber splitter passes through
One output end is connect with the junior's optical fiber for passing through the second port；There is light hole 2601 in the middle part of the movable slider, it is described
Movable slider is set between first optical fiber collimator and the light reflection mirror, and can be slided in the sensor body,
So that the light hole is connected to first optical fiber collimator and the light reflection mirror, constitutes optical path light passing；Or make the light passing
Hole is staggered first optical fiber collimator and the light reflection mirror, constitutes optical path and blocks, the elastic component is folded in the activity
Between sliding block and sensor body.
The embodiment of the present invention additionally provides it in light other than providing the structure of above two fiber switch junction sensor
Using effect of the corresponding optical fiber switching node sensor of fine switch sensing network in fiber cable cross connection box, as shown in Figure 9, wherein
The pulsed light optical fiber that i.e. embodiment of the present invention is proposed of signal resolution equipment 31 opens the light in condition detecting system, except fiber switch passes
Feel the equipment of the other structures component composition outside network.41 be simple gate fiber cable cross connection box, the fiber switch used shown in Fig. 9
Junction sensor 32 can be the fiber switch junction sensor shown in Fig. 8 with light reflection mirror 25；Wherein, 42 shown in Fig. 9
For two-door fiber cable cross connection box, the fiber switch junction sensor 33 used is specially structure shown in fig. 6, wherein second end
The optical fiber 2 (as shown in Figure 3) of the 1102 connection reflection type optical fiber switch sensors of mouth；Wherein, shown in Fig. 9 43 be four Men Guang
Cable distributing box, wherein fiber switch junction sensor 34 is structure shown in fig. 6, and wherein transmission-type fiber switch sensor
The device with corresponding construction proposed by patent document CN205861076U, and the reflection type optical fiber switch sensor is
The device with corresponding construction that patent document CN205861075U is proposed.According to the example above, possessing other quantity doors
Fiber cable cross connection box in, can be realized by adding the transmission-type fiber switch number of sensors, details are not described herein.
Embodiment 2:
The embodiment of the present invention 2 provides another pulsed light fiber switch condition detecting system, as shown in figure 5, detection system
System includes: timer, pulsed light generation module, optical circulator, fiber switch sensing network, optical detector, pulse electrical signal filter
Wave amplification circuit module, data acquisition module, parsing module and memory；Wherein, the timer, pulsed light occur module,
Optical circulator and fiber switch sensing network are sequentially connected, and timer is also connected with data acquisition module, and the first of optical circulator
Port, second port and third port are separately connected the pulsed light and module, fiber switch sensing network and optical detector occur；
The delivery outlet of the optical detector connects the input port of the pulse electrical signal filter amplification circuit module；For
While the triggering for receiving timer generates forward pulse optical signal, acquisition data can be sent to data acquisition module and are referred to
Enable so that in each round detection process by data acquisition module the timing of collected backlight pulse signal can reach
Height it is consistent.
The output port of the pulse electrical signal filter amplification circuit module connects the data acquisition module, wherein institute
State the output port series connection parsing module of data acquisition module；In the concrete realization, the parsing module usually can be by
It denoises module and delustring identification module is constituted,
The input port and output port of the parsing module are also connected with the memory.
Wherein, the parsing module (specifically can be above-mentioned delustring identification module) stores previous sampling period data, institute
It states parsing module to be used for after obtaining fiber switch junction sensor pulse peak positions in memory, after the denoising
Each fiber switch in the current period sampled data and previous sampling period data of (can specifically be completed by the denoising module)
The numerical value of node sensing node pulse peak positions seeks difference, if difference is less than or equal to the light in previous sampling period data
10 of the data of fine switch sensing node pulses peak position maintain the state of fiber switch junction sensor constant,
10 if more than the data of the fiber switch sensing node pulse peak positions in previous sampling period data change
The state of fiber switch junction sensor and the state recording for modifying the fiber switch junction sensor in a reservoir.Wherein,
10 are only intended to the exemplary parameter values illustrated, can be adjusted according to the actual situation during specific implementation
It is whole, and tested and tested by multiple groups, so that the judging result accuracy of set percentage is high as far as possible.
The switch state detecting system based on pulsed light fiber switch sensing node that the embodiment of the present invention is proposed, can be with
By obtaining order, number and its peak value of pulse of sensing node in sensing network sample data sequence during the sampling period
Position, thus according to pulsed light and its pulsed light peak strength, timing and time slot backwards according to the accurate predicate node of sequence node
Switch state.It solves and is difficult to find that enough communications equipment rooms dispose the signal resolution for handling reflected light signal to set nearby
Standby technical problem simplifies detection network system, improves the efficiency of detection system dimension, and reduces maintenance cost.It connects
Get off especially by the functional structure for each unit for forming the detection system, how to realize accurate judgement to be further described
Node Switch state.
In embodiments of the present invention, the timer, which is used to staggeredly be spaced t1 trigger pulse light according to sampling, occurs module hair
Forward pulse light out；The timer is also used to trigger data acquisition module and starts data sampling.
The embodiment that compares 1, the discrepancy of the embodiment of the present invention are that the control port for having adjusted data acquisition module connects
Object is connect, timer is adjusted to by the pulse light generator in embodiment 1, therefore, releases the industry of pulse light generator itself
Business processing pressure, and pulse light generator transmitting forward pulse optical signal and data acquisition module can be gone out by timer design
Lag characteristic of the block acquisition between pulsed optical signals, so as to realize a kind of directive property detection in partition domain, without
The state-detection of all fiber switch junction sensors in entire detection system is completed every time.
Characteristic introduction in relation to other functional structures in the present embodiment, can refer to the description of related content in embodiment 1,
This is repeated no more.Such as: fiber switch sensing network in embodiment 1 and embodiment 2 can be therefore, just real mutually with reference to borrowing
The technical solution illustrated in example 1 for the expansion of fiber switch sensing network is applied, the embodiment of the present invention is equally applicable to.
Embodiment 3:
The present invention also provides other than providing a kind of pulsed light fiber switch condition detecting system as described in Example 1
A kind of pulsed light fiber switch condition detection method, the detection method can be adapted for detection system as described in Example 1
In system, therefore, the elaboration for the correlation method steps characteristic done in embodiments of the present invention can find phase in embodiment 1
The executing subject answered, as shown in Figure 10, which comprises
In step 201, each fiber switch junction sensor pulse peak positions in fiber switch sensing network are obtained.
Its acquisition modes can be the inquiry for sending by the parsing module in embodiment 1 to memory and carrying storage address
Request, and each fiber switch junction sensor pulse peak positions are returned in the fiber switch sensing network in storing to described
Parsing module.Wherein, each fiber switch junction sensor pulse peak positions refer specifically in a detection cycle, collected back
In light pulse data, performance of the respective pulses peak value on each time shaft, and each fiber switch junction sensor due to according to
Preset distance completes layout, and therefore, backlight pulse signal shows acquiring after the transmission of the optical fiber of different length
Ordered arrangement on time shaft.
In step 202, fiber switch node each in current period sampled data and previous sampling period data is sensed
The numerical value of device pulse peak positions seeks difference.
It here is each fiber switch junction sensor pulse peak positions to confirm in step 201 to refer to, and with list
One fiber switch junction sensor, which is that the carry out of calculating granularity one by one is above-mentioned, takes difference operation process.
In step 203, if difference corresponding to the first fiber switch junction sensor is less than or equal to previous sampling week
Issue default first percentage of the data of the fiber switch sensing node pulse peak positions in then maintains corresponding first light
The state of fine switching node sensor is constant.
Herein, the first fiber switch junction sensor illustrates in many fiber switch junction sensors just for the sake of facilitating
A certain possible situation, wherein the corresponding judgment method occurred in the first fiber switch junction sensor can equally be well applied to
Other fiber switch junction sensors in fiber switch sensing network, details are not described herein.
In step 204, if difference corresponding to the first fiber switch junction sensor is greater than previous sampling period data
In the fiber switch sensing node pulse peak positions data the first percentage, modify corresponding first fiber switch node and pass
The recording status of sensor.
In embodiments of the present invention, the selectable value of first percentage is additionally provided, such as: certain between 10%-20%
One parameter value.
The switch state detection method based on pulsed light fiber switch sensing node that the embodiment of the present invention is proposed, can be with
By obtaining order, number and its peak value of pulse of sensing node in sensing network sample data sequence during the sampling period
Position, thus according to pulsed light and its pulsed light peak strength, timing and time slot backwards according to the accurate predicate node of sequence node
Switch state.It solves and is difficult to find that enough communications equipment rooms dispose the signal resolution for handling reflected light signal to set nearby
Standby technical problem simplifies detection network system, improves the efficiency of detection system dimension, and reduces maintenance cost.
During the embodiment of the present invention is realized, present sample data in step 202, as shown in figure 11, specifically by with
Lower execution step obtains:
In step 2011, it is staggeredly spaced t1 according to sampling to fiber switch sensing network and sends forward pulse light, and opens
Beginning data sampling；
Wherein, the pulsewidth w of the forward pulse light is less than or equal to 3 microseconds, also, equips in fiber switch sensing network
There is the distance between each fiber cable cross connection box of fiber switch junction sensor to be greater than 300m.
Wherein, setting for above-mentioned parameter value is specifically to be obtained according to following theory deduction: (its material is quartz to ordinary optic fibre
Glass) in, photon is to be propagated in the form of total reflection, therefore the propagation to pass through will appear delay, speed meeting
It reduces, about 2/3rds of vacuum light speed, about 200000km/s, pulsewidth may cause spacing when being greater than 3 microsecond and be less than
Two of two sensor nodes reflection of 300m generate the overlapping of signal backwards to pulsed light, so that the present invention is difficult to differentiate between difference
The position in the high level section in time-domain signal backwards to pulsed optical signals of sensing node, pulsewidth can make less than 3 microseconds
The sensing node minimum spacing for the system of obtaining reaches 300m, meets the demand of the practical spacing of most optical cross boxes in application.
The data sampling obtains current sample period backwards to pulsed optical signals with sample frequency F and sampling duration t2 acquisition
Data, wherein the sampling duration t2 and the sample frequency F are preset value；The sampling duration of the data acquisition module
T2, which is greater than from a forward pulse optical signal, is issued to the duration for receiving the last one between pulsed optical signals.According to above-mentioned
Limited way, it is generally the case that the value of sampling duration t2 meets: 0.05ms≤t2≤1ms.Wherein, the last one is backwards to pulse
Optical signal can be understood as the farthest fiber switch sensor reflection forward pulse optical signal of range pulse optical generator and be formed
's.
It grows to be greater than to be issued to from a forward pulse optical signal when shortening sampling and receives the last one backwards to pulsed light letter
Duration between number can reduce the operating time of data acquisition module in the single sampling period, reduce system power dissipation；When sampling
The long 0.05ms that is greater than or equal to can meet round-trip demand of the pulsed light in 5km optical path, and pulsed light is in 100 kilometers of optical path
In the round-trip required time be about 1ms, the optical path greater than 100 kilometers, pulsed light may be lost totally, sampling longer than 1ms
Duration may bring a large amount of meaningless sampled datas and system load, this example allows the maximum light that detection method is supported
Road distance is in 5km to 100km.
In step 2012, according to the content that the data sampling obtains, each light in fiber switch sensing network is parsed
Peak value of pulse of the fine switching node sensor on respective pulses peak position.
Wherein, shown sample frequency F is greater than or equal to 2 times of obtained parameter values by 1 second quotient divided by the pulsewidth.
In the step 2011 of the embodiment of the present invention, the instruction that trigger data acquisition module starts data sampling is pulse electricity
Signal, the data acquisition module are started to sample by the rising edge triggering of the pulse electrical signal.Optical circulator makes preceding to arteries and veins
It washes off while be not emitted directly toward optical detector, avoids backwards to pulsed light directive pulse light generator, reduce pulsed light and exist
Loss in optical path.Both the instruction of beginning data sampling and forward pulse optical signal are simultaneously emitted by, so that data acquisition module
After receiving the instruction for starting data sampling every time, the peak value backwards to pulsed optical signals of each fiber switch sensing node reflection
Position is kept fixed in each sampling period.
Wherein, there are a kind of preferred implementation, the pulse signal form of the forward pulse light is square-wave signal.Cause
For rising edge and the failing edge occupied time of square-wave signal are less relative to pulsewidth, while the height electricity of square-wave pulse signal
The flat duration is longer relative to the high level lasting time of the waveform of other forms, when sample frequency is equal to 1 second divided by described
At 2 times of the quotient of pulsewidth, the height of pulse signal can be collected by falling into any one in two in pulse signal sampled points
Level energy.
The embodiment of the invention also provides a preferred staggeredly interval time sections, are specifically less than 1 second.Because of optical cable
The duration of enabling or the shutdown movement of cross-connecting box is generally less than 500 milliseconds, when the value of C is greater than 500 milliseconds divided by between sampling
Every the quotient of t1, buffer can store multiple periodic sampling data more than duration needed for sensing node state change, buffer
The data of middle storage are enough sensing node state change caused by determining the enabling of fiber cable cross connection box or shutdown movement.
In conjunction with the embodiment of the present invention, there are a kind of preferred implementation, the specific pulse light generator can be with
For issuing direct current light, the direct current light is used to check the light loss on fiber switch sensing network main line using light power meter.By
In the main line of fiber switch sensing network there are a large amount of fiber coupling point, the coupling mass of these Coupling points determines optical signal
Loss in main line can be made using light power meter by the direct current light that pulse light generator issues to end on main line or reflection
The light power stabilising reading of receiving end is possibly realized.
Embodiment 4:
Providing pulsed light fiber switch condition detecting system as described in Example 1 and pulse as described in example 2
After light fiber switch condition detection method, part of the embodiment of the present invention is real from how to run in detection system described in embodiment 1
Detection method angle described in example 2 is applied, illustrates technical solution proposed by the invention more completely to execute process.Such as Figure 12
Shown, the execution process includes:
In step 301, timer issues Periodic triggers to pulse light generator.
Wherein, the period is such as the Examples 1 and 2 for a complete fiber switch sensing network detection time
Described in sampling staggeredly interval t1 be the period design parameter performance.
In step 302, pulse light generator be simultaneously emitted by after receiving Periodic triggers forward pulse light and to
Data acquisition module, which is sent, starts data sampling instruction.
Wherein, data acquisition module with the pulse electrical signal filter and amplification module and optical detector in addition to being sequentially connected
Outside, the effect of the driver of the optical detector and pulse point signal filter and amplification module is also acted, i.e., the described data are adopted
Collecting module can also adjust the optical detector and pulse telecommunications according to the signal-to-noise ratio for acquiring data, the intensity for acquiring data etc.
The running parameter of number filter and amplification module (for simplification figure 4, and prominent optical signal transmission link, therefore does not mark out number in Fig. 4
It is connected as optical detector with the electric appliance of the driving equipment of pulse electrical signal filter and amplification module according to acquisition module).
In step 303, data acquisition module receive start sampling instruction after with sample frequency F and sampling duration t2
Acquisition obtains the data of current sample period backwards to pulsed optical signals.
Wherein, the apolegamy of sample frequency F and sampling duration t2 can with related content in reference implementation example 1 and embodiment 2,
This is repeated no more.However, the extension implementation as the embodiment of the present invention, can also add a ginseng for the detection system
Number input interfaces, wherein for operator input parameter include in fiber switch sensing network each adjacent fiber cable cross connection box it
Between minimum separation distances, the fiber dimensions that fiber switch sensing network uses, farthest optical cable is handed in fiber switch sensing network
Connect the distance of case.Then processor can generate and current optical fiber switch sensing network when getting the parameter of above-mentioned input
Pulsed optical signals, detection cycle, data acquisition duration, optical detector detection sensitivity and the pulse electrical signal filtering being adapted to are put
One or more in big module amplification factor.Wherein, corresponding each pulsed optical signals, detection cycle and data acquisition duration can
With corresponding content in reference implementation example 1 and embodiment 2, details are not described herein.Above-mentioned processor can be replaced by the parsing module
In generation, the structure after appending control signaling linking relationship is as shown in figure 13, and wherein dotted line is control signaling；It is also possible to be described
Pulse fiber switch state detecting system is additionally arranged, and establishes with timer, pulse light generator, data acquisition module etc.
There is signal to control link, connection structure is as shown in figure 14.
In step 304, denoising module carries out further denoising to current sample period data.
Wherein, denoising process can realize how to denoise not is that the embodiment of the present invention to be protected with reference to existing method
Therefore shield and the main points illustrated repeat no more.
In step 305, delustring identification module takes out each sensing node pulse peak positions from memory.
Wherein, each sensing node pulse peak positions can be is entered into memory by operator, is also possible to
Operator gives the fiber switch junction sensor of the processor or analysis module typing fiber switch sensing network
After quantity, each sensing node peak value of pulse is obtained by testing the distribution obtained backwards to pulsed optical signals and the quantitative analysis
Position.It, can also be after the fiber cable cross connection box in fiber switch sensing network changes, by triggering again for the latter
Above-mentioned test process completes the update of each sensing node pulse peak positions stored in memory.
Within step 306, by each optical fiber in the current period sampled data and previous sampling period data after the denoising
The numerical value of switching node sensing node pulse peak positions seeks difference.
Wherein, previous sampling period data are preferably the buffer area for being stored in delustring identification module, due to two samplings
The time of period distances is shorter, and it is that can reduce reading data and processing that previous sampling period data, which are stored separately in memory,
Efficiency.
In step 307, difference is less than or equal to the fiber switch sensing node pulse peak in previous sampling period data
It is worth the 10 of the data of position, thens follow the steps 309；It is no to then follow the steps 308.
In step 308, the state and the optical fiber in location revision memory for changing fiber switch junction sensor are opened
The state recording of joint point sensor.It returns to step 301 and carries out the forward pulse optical signal transmission of next cycle and backwards to arteries and veins
The acquisition of pulsed light signal.
In a step 309, delustring discrimination module caches current sample period data.It returns to step 301 and carries out next week
The forward pulse optical signal of phase is sent and the acquisition of pulsed optical signals backwards.
It is worth noting that information exchange, implementation procedure etc. between module, unit in above-described embodiment 1 in system
Content, due to being based on same design with processing method embodiment 2 of the invention, the content of the two describes mutually to refer to,
Details are not described herein again.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of pulsed light fiber switch condition detecting system, which is characterized in that detection system includes: timer, pulsed light hair
Raw module, optical circulator, fiber switch sensing network, optical detector, pulse electrical signal filter amplification circuit module, data acquisition
Module, parsing module and memory；Wherein, module, optical circulator and fiber switch Sensor Network occur for the timer, pulsed light
Network is sequentially connected, and pulsed light occurs module and is also connected with data acquisition module, the first port of optical circulator, second port and the
Three ports are separately connected the pulsed light and module, fiber switch sensing network and optical detector occur；
The delivery outlet of the optical detector connects the input port of the pulse electrical signal filter amplification circuit module；
The output port of the pulse electrical signal filter amplification circuit module connects the data acquisition module, wherein the number
According to the output port series connection parsing module of acquisition module；
The input port and output port of the parsing module are also connected with the memory；
Wherein, the ring of light is walked to being followed successively by first port, second port and third port in the optical circulator；Fiber switch passes
Each fiber switch junction sensor includes sensor body, optical fiber fiber management tray, fiber splitter, the first optical fiber standard in sense network
Straight device, the second optical fiber collimator, movable slider and elastic component, between first optical fiber collimator and second optical fiber collimator
It is positioned in the sensor body every set distance accommodating, and first optical fiber collimator and second optical fiber collimator
Realize Gaussian Beam Coupling；Higher level's optical fiber penetrates after the first port from the fiber entrance of the optical fiber fiber management tray and disk is fine
After setting length, it is pierced by from the fiber outlet of the optical fiber fiber management tray, then accesses the input terminal of the fiber splitter；It is described
Fiber splitter is connect by an output end with the input terminal of first optical fiber collimator, and the fiber splitter is defeated by one
Outlet is connect with the junior's optical fiber accessed through the third port；The output end of second optical fiber collimator with through described second
The local fiber connection of port access；There is light hole, the movable slider is set to first light in the middle part of the movable slider
It between fine collimator and second optical fiber collimator, and can be slided in the sensor body, be connected to the light hole
First optical fiber collimator and second optical fiber collimator constitute optical path light passing；Or so that the light hole is staggered described
First optical fiber collimator and second optical fiber collimator constitute optical path and block, and the elastic component is folded in the movable slider
Between sensor body；
Wherein, the parsing module stores previous sampling period data, and the parsing module from memory for obtaining light
It, will be in the current period sampled data and previous sampling period data after denoising after fine switching node sensor pulse peak position
The numerical value of each fiber switch node sensing node pulse peak positions seeks difference, if difference is less than or equal to the previous sampling period
10 of the data of the fiber switch sensing node pulse peak positions maintain fiber switch junction sensor in data
State it is constant, if more than the percentage of the data of the fiber switch sensing node pulse peak positions in previous sampling period data
Ten states for changing the state of fiber switch junction sensor and modifying the fiber switch junction sensor in a reservoir
Record.
2. pulsed light fiber switch condition detecting system according to claim 1, which is characterized in that the timer is used for
According to sampling, staggeredly module sending forward pulse light occurs for interval t1 trigger pulse light；
Pulsed light occurs module and is also used to issuing forward pulse light simultaneously, and trigger data acquisition module starts data sampling.
3. pulsed light fiber switch condition detecting system according to claim 2, which is characterized in that the forward pulse light
Pulse signal form be square-wave signal, the data acquisition module be used for the pulse electrical signal leading edge position trigger
Start data sampling.
4. pulsed light fiber switch condition detecting system according to claim 2 or 3, which is characterized in that the forward direction arteries and veins
The pulsewidth w washed off is less than or equal to 3 microseconds, and the sample frequency F of the data acquisition module is greater than or equal to by 1 second divided by described
2 times of obtained parameter values of the quotient of pulsewidth.
5. pulsed light fiber switch condition detecting system according to claim 4, which is characterized in that the data acquisition module
Block be used for receive it is described start sampling instruction after with sample frequency F and sampling duration t2 acquire obtained backwards to pulsed optical signals
The data of current sample period, wherein the sampling duration t2 and sample frequency F is preset value；
The sampling duration t2 of the data acquisition module, which is greater than to be issued to from a forward pulse optical signal, receives the last one back
To the duration between pulsed optical signals.
6. pulsed light fiber switch condition detecting system according to claim 5, which is characterized in that the sampling duration t2
Value also meet: 0.05ms≤t2≤1ms；Wherein, module and optical detector occur for fiber switch junction sensor and pulsed light
The round-trip optical path distance constituted is between 5km to 100km.
7. pulsed light fiber switch condition detecting system according to claim 1, which is characterized in that the pulsed light occurs
Device can be also used for issuing direct current light, and the direct current light is examined for the light loss on fiber switch sensing network main line.
8. pulsed light fiber switch condition detecting system according to claim 1, which is characterized in that the optical circulator with
Pulsed light occur used optical fiber between module, fiber switch sensing network and optical detector be G.652D, G.652C,
G.652B the central wavelength for the pulsed optical signals that perhaps G.652A the pulse light generator issues be 1310nm or
1550nm。
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| RU2802238C1 (en) * | 2022-11-09 | 2023-08-23 | Акционерное общество "Москабель-Фуджикура" (АО "МКФ") | Fiber-optic cable line |
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| RU2802238C1 (en) * | 2022-11-09 | 2023-08-23 | Акционерное общество "Москабель-Фуджикура" (АО "МКФ") | Fiber-optic cable line |
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