CN107515100A - 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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- CN107515100A CN107515100A CN201710698365.XA CN201710698365A CN107515100A CN 107515100 A CN107515100 A CN 107515100A CN 201710698365 A CN201710698365 A CN 201710698365A CN 107515100 A CN107515100 A CN 107515100A
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Abstract
The present invention relates to fiber switch technical field, there is provided a kind of pulsed light fiber switch condition detecting system.In detecting 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 the 3rd port connect pulsed light and module, fiber switch sensing network and photo-detector occur respectively；The input port of the delivery outlet connection pulse electrical signal filter amplification circuit module of photo-detector；The output port connection data acquisition module of pulse electrical signal filter amplification circuit module, wherein, the output port series connection parsing module of data acquisition module；The output port connection memory of parsing module.The present invention solves the technical barrier for being difficult to find that the signal resolution equipment that enough communications equipment rooms dispose for handling reflected light signal nearby, simplifies detection network system, improves the efficiency of detecting system dimension.
Description
【Technical field】
The present invention relates to fiber switch technical field, more particularly to a kind of pulsed light fiber switch condition detecting system.
【Background technology】
Fiber cable cross connection box is the handing-over equipment that optic fiber distribution, jumper connection are provided 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 with 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.
As Optical Fiber Subscriber Access Network (Fiber-to-the-x, is abbreviated as：FTTx) the popularization of technology, Various types of data business
Extension, operator in city largely set fiber cable cross connection boxes be used for fiber cable network accesses.But most of optical cable joining
Case is installed outdoors, is again the mute resource for carrying a large amount of important services in case, out of doors, more as inactive component, longtime running
Safe operation of the peripheral environment of change to fiber cable cross connection box causes potential threat, attendant can not distally be managed and
Monitoring is a very serious and urgent problem to be solved.Because substantial amounts 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 in general
Electric transducer can not be applied.There is the cross-connecting box management system that operator designs and develops 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 the substantial amounts of O＆M of operator and traffic lost, serious even causes political affairs
Control influence.Therefore, the safety of cross-connecting box is ensured, is the most important condition that Logistics networks last one kilometer can be unobstructed.
In order to ensure the safety of cross-connecting box, a kind of chamber door that can detect fiber cable cross connection box is objectively needed to open and close
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, power supply is not provided.So objectively require that 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.Therefore, Publication No. CN205861075U and
CN205861076U Chinese patent application disclose a kind of reflective switch sensor (as Figure 1-3) based on optical fiber with
A kind of transmission-type switch sensor based on optical fiber, the reflected light break-make of the light beam sent using DC light source in the sensor come
Express the open and-shut mode of sensor.The door leaf that this two classes switch sensor has been applied in distributing box of communication optical cable is opened, closure
In sensing, pass through reflective and two kinds of sensors of transmission-type combination, it is possible to achieve to the multiple leaf door page of multi-door fiber cable cross connection box
Monitoring.
But for for handle reflected light signal signal resolution equipment can only by the presence of reflected light in optical fiber with
It is no to judge the door leaf open and-shut mode of single fiber optic cable cross-connecting box, i.e. a single fiber optic cable cross-connecting box corresponding signal resolution equipment, this
Result in needing to use a large amount of idle fiber resources to complete to multiple fiber cable cross connection box door leaf open and-shut modes in practical application
Monitoring, and then cause the deployment of optical fiber sensing system to cause the reduction of telecom operators' fiber optic network dilatation ability.This
Outside, fiber cable cross connection box generally along optical cable tunnel-type into 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 dispose for handling reflection nearby now
The signal resolution equipment of optical signal.
In consideration of it, the defects of overcoming present in the prior art is the art urgent problem to be solved.
【The content of the invention】
The technical problem to be solved in the present invention is to utilize networking monitoring of the less fiber resource to multiple fiber cable cross connection boxes
Function, solve because communications equipment room is less, it is difficult to find enough communications equipment rooms and dispose nearby for handling reflected light
The technical barrier of the signal resolution equipment of signal.
The present invention adopts the following technical scheme that：
In a first aspect, the invention provides a kind of pulsed light fiber switch condition detecting system, detecting system includes：Regularly
Module, optical circulator, fiber switch sensing network, photo-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 the 3rd port connect the pulsed light and module, fiber switch sensing network and photo-detector occur respectively；
The delivery outlet of the photo-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 the 3rd 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 accurate
Straight device houses with the second optical fiber collimator interval setpoint distance to be positioned in the sensor body, and first optical fiber
Collimater realizes Gaussian Beam Coupling with second optical fiber collimator；Higher level's optical fiber is after the first port from the optical fiber
The fiber entrance of fiber management tray penetrates and after the fine setting length of disk, passes from the fiber outlet of the optical fiber fiber management tray, then access
The input of the fiber splitter；The fiber splitter passes through an output end and the input of first optical fiber collimator
Connection, the fiber splitter are connected by an output end with the subordinate's optical fiber accessed through the 3rd port；Second light
The output end of fine collimater is connected with the local fiber accessed through the second port；There is thang-kng in the middle part of the movable slider
Hole, the movable slider are located between first optical fiber collimator and second optical fiber collimator, and can be in the sensing
Slided in device body, the light hole is connected first optical fiber collimator and second optical fiber collimator, form light path
Thang-kng；Or the light hole is staggered first optical fiber collimator and second optical fiber collimator, form light path and block,
The elastic component is folded between the movable slider and sensor body.
Preferably, the timer is for according to sampling, staggeredly t1 trigger pulses light generation module in interval to send forward pulse
Light；
Pulsed light occurs module and is additionally operable to sending forward pulse light simultaneously, and trigger data acquisition module starts data and adopted
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 more than or equal to 2 times of obtained parameter values by 1 second divided by the business of the pulsewidth.
Preferably, the data acquisition module is used to receive described start after sampling instructs with sample frequency F with adopting
Sample duration t2 collections obtain the data of current sample period backwards to pulsed optical signals, wherein, the sampling duration t2 adopts with described
Sample frequency F is preset value；
The sampling duration t2 of the data acquisition module, which is more than to be issued to from a forward pulse optical signal, receives last
The individual 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 optical path distance that device and pulsed light generation module and photo-detector are formed is between 5km to 100km.
Preferably, the pulse light generator can be also used for sending direct current light, and the direct current light is examined for optical fiber
The light loss of switch sensing network backbone.
Preferably, institute between optical circulator and pulsed light the generation module, fiber switch sensing network and photo-detector
The optical fiber used for G.652D, G.652C, G.652B or G.652A, the pulsed optical signals that the pulse light generator is sent
Centre wavelength is 1310nm or 1550nm.
Second aspect, present invention also offers a kind of pulsed light fiber switch condition detecting system, detecting system includes：It is fixed
When device, pulsed light occur module, optical circulator, fiber switch sensing network, photo-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, the second end
Mouth and the 3rd port connect the pulsed light and module, fiber switch sensing network and photo-detector occur respectively；
The delivery outlet of the photo-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 for according to sampling, staggeredly t1 trigger pulses light generation module in interval to send forward pulse
Light；
The timer is additionally operable 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 more than or equal to 2 times of obtained parameter values by 1 second divided by the business of the pulsewidth.
Preferably, the data acquisition module is used to receive described start after sampling instructs with sample frequency F with adopting
Sample duration t2 collections obtain the data of current sample period backwards to pulsed optical signals, wherein, the sampling duration t2 adopts with described
Sample frequency F is preset value；
The sampling duration t2 of the data acquisition module, which is more than to be issued to from a forward pulse optical signal, receives last
The individual duration between pulsed optical signals.
Switch state detecting system based on pulsed light fiber switch sensing node proposed by the invention, obtained to pass through
The order of sensing node, the position of number and its peak value of pulse sample data sequence within the sampling period in sensing network, from
And switch shape according to the accurate predicate node of sequence node according to backwards to pulsed light and its pulsed light peak strength, sequential and time slot
State, there is provided possible to realize framework.Solve and be difficult to find that enough communications equipment rooms dispose for handling reflected light nearby
The technical barrier of the signal resolution equipment of signal, simplifies detection network system, improves the efficiency of detecting system dimension, and drops
Low maintenance cost.
【Brief description of the drawings】
In order to illustrate the technical solution of the embodiments of the present invention more clearly, it will make below to required in the embodiment of the present invention
Accompanying 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, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying 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 closure state
Figure；
Fig. 2 is the structural representation that existing a kind of fiber switch sensor provided in an embodiment of the present invention is in open mode
Figure；
A kind of Fig. 3 existing backlight pulse light fiber switch sensor construction schematic diagrames 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 representation of fiber switch junction sensor provided in an embodiment of the present invention；
Fig. 7 is a kind of structure being under another state of fiber switch junction sensor provided in an embodiment of the present invention
Schematic diagram；
Fig. 8 is the structural representation 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 schematic flow sheets 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 methods provided in an embodiment of the present invention
Existing flow chart；
A kind of Figure 12 pulsed light fiber switch condition detection method schematic flow sheets provided in an embodiment of the present invention；
Figure 13 another pulsed light fiber switch condition detecting system configuration diagrams provided in an embodiment of the present invention；
Figure 14 another pulsed light fiber switch condition detecting system configuration diagrams provided in an embodiment of the present invention；
With reference to accompanying drawing, make the following instructions：
1st, sensor body；2nd, optical fiber；3rd, collimater；4th, movable slider；41st, light hole；5th, light reflecting element；6th, it is elastic
Part；7th, rubber bushing.
【Embodiment】
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
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 invention, term " interior ", " outer ", " longitudinal direction ", " transverse direction ", " on ", " under ", " top ", " bottom " etc. refer to
The orientation or position relationship shown be based on orientation shown in the drawings or position relationship, be for only for ease of the description present invention rather than
It is required that the present invention must be with specific azimuth configuration and operation, therefore it is not construed as limitation of the present invention.
In addition, as long as technical characteristic involved in each embodiment of invention described below is each other not
Conflict can is formed to be mutually combined.
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, detecting system
Including：Module, optical circulator, fiber switch sensing network, photo-detector, pulse electrical signal filtering occur for timer, pulsed light
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 gathered data instruction, from
And the sequential of the backlight pulse signal collected by data acquisition module in each round detection process is enabled to reach height
It is consistent.The first port of optical circulator, second port and the 3rd port connect the pulsed light generation module respectively, optical fiber is opened
Close sensing network and photo-detector；The ring of light is walked to being followed successively by first port, second port and the 3rd end in the optical circulator
Mouthful.
The delivery outlet of the photo-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 specific implementation, the parsing module generally can be by
Denoising module and delustring identification module are formed, and the input port and output port of the parsing module are also connected with the memory.
Wherein, the parsing module (can be specifically above-mentioned delustring identification module) stores previous sampling period data, institute
State parsing module to be used for after obtaining fiber switch junction sensor pulse peak positions from memory, after the denoising
The current period sampled data of (can specifically be completed by the denoising module) and each fiber switch in previous sampling period data
The numerical value of node sensing node pulse peak positions asks for difference, if difference is less than or equal to the light in previous sampling period data
The state of 10 maintenance fiber switch junction sensors of the data of fine switch sensing node pulses peak is constant,
Change if the 10 of the data of the fiber switch sensing node pulse peak positions in more than previous sampling period data
The state of fiber switch junction sensor and the state recording for changing the fiber switch junction sensor in a reservoir.Wherein,
10 are only intended to the exemplary parameter values of explanation, can be adjusted during specific implementation according to actual conditions
It is whole, and pass through multigroup experiment test so that the judged result degree of 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 and obtain the order of sensing node, the position of number and its peak value of pulse sample data sequence within the sampling period in sensing network
Put, so as to be opened according to backwards to pulsed light and its pulsed light peak strength, sequential and time slot according to the accurate predicate node of sequence node
Off status, there is provided possible to realize framework.Solve and be difficult to find that enough communications equipment rooms dispose for handling instead nearby
The technical barrier of the signal resolution equipment of optical signal is penetrated, simplifies detection network system, improves the efficiency of detecting system dimension,
And reduce maintenance cost.Next by especially by the functional structure for each unit for forming the detecting system, come further
Illustrate how to realize accurate predicate node on off state.
In embodiments of the present invention, the timer is used to staggeredly be spaced t1 trigger pulses light generation module hair according to sampling
Go out forward pulse light；Pulsed light occurs module and is additionally operable to sending forward pulse light simultaneously, and trigger data acquisition module starts to count
According to sampling.
Wherein, the instruction that trigger data acquisition module starts data sampling is pulse electrical signal, the data acquisition module
Start to sample by the rising edge triggering of the pulse electrical signal.Optical circulator causes forward pulse light not to be emitted directly toward photo-detector
While, avoid backwards to pulsed light directive pulse light generator, reduce 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 backwards to pulsed optical signals of each fiber switch sensing node reflection is in each sampling period
Keep fixing.
The embodiment of the present invention additionally provides a preferable staggeredly interval time section, is specifically less than 1 second.Because optical cable
The duration of enabling or the shutdown action of cross-connecting box is generally less than 500 milliseconds, as the sampling period number C of the storage of buffer
Value be more than 500 milliseconds divided by sampling interval t1 of business, buffer (refers to the buffer or refer to composition parsing that parsing module possesses
The buffer that the above-mentioned delustring identification module of module possesses) the multiple of duration needed for sensing node state change can be stored over
Periodic sampling data, section is sensed caused by the data deposited in buffer are enough the enabling for judging fiber cable cross connection box or shutdown acts
Dotted state changes.
Wherein, a kind of preferable implementation be present, the pulse signal form of the forward pulse light is square-wave signal.Cause
For the time shared by the rising edge and trailing edge of square-wave signal is 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 business 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 obtains the data of current sample period with the t2 collections of sampling duration 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 more than to be issued to from a forward pulse optical signal, receives last
The duration between pulsed optical signals that individual fiber switch junction sensor returns.According to above-mentioned limiting mode, normal conditions
Under, sampling duration t2 value 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 more than or equal to 2 times of obtained parameter values by 1 second divided by the business of the pulsewidth.
Wherein, in ordinary optic fibre (its material is quartz glass), photon is propagated in the form of total reflection, therefore from one
Hold the propagation of the other end that delay occurs, speed can reduce, about 2/3rds of vacuum light speed, about 200000km/s,
Pulsewidth may cause two that are smaller than 300m two sensor nodes reflection and produce letter backwards to pulsed light when being more than 3 microsecond
Number it is 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, which is less than 3 microseconds, can cause the sensing node minimum spacing of system to reach 300m, meet more in application
The demand of number optical cross box actual spacing (and in actual mechanical process, can further reduce sensing section by improving sample frequency
Distance between point, will not be repeated here).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 Figure 6, also will be from various embodiments of the present invention
The light that light source side is sent is referred to as forward pulse light, and the light reflected by the fiber switch junction sensor is referred to as backwards to arteries and veins
Wash off.
In embodiments of the present invention, the pulse light generator can be also used for sending direct current light, the direct current light by with
In the light loss for checking fiber switch sensing network main line.Because substantial amounts of optical fiber coupling be present in 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 sent by pulse light generator
Light can make it possible to use light power stabilising reading of the light power meter to end on main line or reflection receivable end.
With pulsed light module, fiber switch Sensor Network occur for optical circulator described in detecting system described in the embodiment of the present invention
It is any during between network and photo-detector G.652D, G.652C, G.652B and G.652A used optical fiber is, accordingly
The centre wavelength for the pulsed optical signals that the pulse light generator is sent is 1310nm or 1550nm.
Directly use optical fiber communication, the loss of fiber coupling point is lower, while centre wavelength be 1310nm or
1550nm pulsed optical signals in G.652 serial telecommunication optical fiber there is lower light energy to decay.
In embodiments of the present invention, as shown in fig. 6, each fiber switch junction sensor bag 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 are accommodating fixed with the second optical fiber collimator interval setpoint distance
In the sensor body, and first optical fiber collimator realizes Gaussian beam coupling with second optical fiber collimator
Close；Higher level's optical fiber 18 is penetrated after the first port 1101 from the fiber entrance of the optical fiber fiber management tray and the fine setting length of disk
Afterwards, passed from the fiber outlet of the optical fiber fiber management tray, then access the input of the fiber splitter；The optical fibre light splitting
Device is connected by an output end with the input of first optical fiber collimator, and the fiber splitter passes through an output end and warp
Subordinate's optical fiber 110 of 3rd port 1103 access 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 in the middle part of the movable slider, the movable slider is located at
It between first optical fiber collimator and second optical fiber collimator, and can slide, make described in the sensor body
Light hole connects first optical fiber collimator and second optical fiber collimator, forms light path thang-kng；Or make the thang-kng
Hole is staggered first optical fiber collimator and second optical fiber collimator, is formed light path and is blocked, the elastic component is folded in institute
State between movable slider and sensor body.So, two optical fiber collimators form stabilization with light hole on movable slider
Light path；The displacement of movable slider makes light hole have connection or with blocking two states amount；When the door of monitored device, such as light
When the chamber door of cable distributing box is closed mode, the exposed junction of movable slider is squeezed in, and elastic component is in compressive state, referring to figure
2, now, for 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 thang-kng.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 are ejected by elastic component, and referring to Fig. 7, now, light hole and two optical fiber collimators in the middle part of movable slider are not
On same straight line, light path is " disconnected ", i.e., light path blocks.So far, the open and-shut mode for being monitored " door " is changed for light path
On off operating mode.So, the open and-shut mode of " door " can be changed for the break-make of light path, effectively solved each under non-transformer environment
Kind of device, equipment " door " open and-shut mode monitoring problem.
When local fiber cable cross connection box has two chamber doors, 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, and this is reflective
The open and-shut mode that fiber switch sensor is used 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
Switched and 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 light path.The structure and principle of reflection type optical fiber switch sensor, in patent document
It has been discussed in detail, has will not be repeated here in CN205861075U.
In embodiments of the present invention, if fiber cable cross connection box has a chamber door；Fiber switch junction sensor is used for should
The monitoring of the fiber cable cross connection box door opening or closing state, now, relatively with the fiber switch junction sensor shown in Fig. 6, it 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
Reflected and formed backwards to pulsed light light path by the Faraday after two optical fiber collimators, or direct impulse light is through fiber reel
Reflected and formed backwards to pulsed light light by the light reflection mirror after fine box, fiber splitter, the first optical fiber collimator, light hole
Road.So, the presence backwards to pulsed light light path can express chamber door closure with opening two states with disappearance, that is to say, that chamber door is opened
Closed state amount directly can be transferred to signal resolution equipment by thang-kng optical fiber, under the site environment of passive condition, to 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, exemplified by 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 be used for higher level
The first port 2101 that optical fiber 28 accesses and the second port 2102 for the access of subordinate's optical fiber 29, first optical fiber collimator
House and be positioned in the sensor body with light reflection mirror interval setpoint distance, and in first optical fiber collimator
Axle 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 the fine setting length of disk, passed from the fiber outlet of the optical fiber fiber management tray, then access the input of the fiber splitter；
The fiber splitter is connected by an output end with the input of first optical fiber collimator, and the fiber splitter passes through
One output end is connected with subordinate's optical fiber through the second port；There is light hole 2601 in the middle part of the movable slider, it is described
Movable slider is located between first optical fiber collimator and the light reflection mirror, and can be slided in the sensor body,
The light hole is connected first optical fiber collimator and the light reflection mirror, form light path thang-kng；Or make the thang-kng
Hole is staggered first optical fiber collimator and the light reflection mirror, is formed light path and is blocked, 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 in addition to 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 part composition outside network.41 be simple gate fiber cable cross connection box shown in Fig. 9, its fiber switch used
Junction sensor 32 can be the fiber switch junction sensor with light reflection mirror 25 shown in Fig. 8；Wherein, 42 shown in Fig. 9
For two-door fiber cable cross connection box, its fiber switch junction sensor 33 used is specially the structure shown in Fig. 6, wherein, the second end
The optical fiber 2 (as shown in Figure 3) of the connection of the mouth 1102 reflection type optical fiber switch sensors；Wherein, 43 it is four light shown in Fig. 9
Cable distributing box, wherein, fiber switch junction sensor 34 is the 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, will not be repeated here by setting up the transmission-type fiber switch number of sensors.
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：Module, optical circulator, fiber switch sensing network, photo-detector, pulse electrical signal filter occur for timer, pulsed light
Ripple 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 the 3rd port connect the pulsed light and module, fiber switch sensing network and photo-detector occur respectively；
The delivery outlet of the photo-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, gathered data can be sent to data acquisition module and referred to
Order, so that the sequential of the backlight pulse signal collected in each round detection process by data acquisition module 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 specific implementation, the parsing module generally can be by
Denoising module and delustring identification module are formed,
The input port and output port of the parsing module are also connected with the memory.
Wherein, the parsing module (can be specifically above-mentioned delustring identification module) stores previous sampling period data, institute
State parsing module to be used for after obtaining fiber switch junction sensor pulse peak positions from memory, after the denoising
The current period sampled data of (can specifically be completed by the denoising module) and each fiber switch in previous sampling period data
The numerical value of node sensing node pulse peak positions asks for difference, if difference is less than or equal to the light in previous sampling period data
The state of 10 maintenance fiber switch junction sensors of the data of fine switch sensing node pulses peak is constant,
Change if the 10 of the data of the fiber switch sensing node pulse peak positions in more than previous sampling period data
The state of fiber switch junction sensor and the state recording for changing the fiber switch junction sensor in a reservoir.Wherein,
10 are only intended to the exemplary parameter values of explanation, can be adjusted during specific implementation according to actual conditions
It is whole, and pass through multigroup experiment test so that the judged result degree of 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 the order of sensing node in sensing network, number and its peak value of pulse sample data sequence within the sampling period
Position, so as to foundation backwards to pulsed light and its pulsed light peak strength, sequential and time slot according to the accurate predicate node of sequence node
On off state.Solve and be difficult to find that enough communications equipment rooms dispose nearby and set for handling the signal resolution of reflected light signal
Standby technical barrier, detection network system is simplified, improve the efficiency of detecting system dimension, and reduce maintenance cost.Connect
Get off especially by the functional structure for each unit for forming the detecting system, accurate judgement how is realized to be expanded on further
Node Switch state.
In embodiments of the present invention, the timer is used to staggeredly be spaced t1 trigger pulses light generation module hair according to sampling
Go out forward pulse light；The timer is additionally operable 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 that have 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 collection between pulsed optical signals, so as to realize that a kind of directive property in partition domain detects, without
The state-detection of all fiber switch junction sensors in whole detecting system is completed every time.
Characteristic introduction about other functional structures in the present embodiment, refers to the description of related content in embodiment 1,
This is repeated no more.Such as：Fiber switch sensing network can be therefore, just real mutually with reference to borrowing in embodiment 1 and embodiment 2
The technical scheme for deploying elaboration in example 1 for fiber switch sensing network is applied, is equally applicable to the embodiment of the present invention.
Embodiment 3:
The present invention also provides in addition to 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 go 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, phase can be found in embodiment 1
The executive agent answered, as shown in Figure 10, methods described includes：
In step 201, each fiber switch junction sensor pulse peak positions in fiber switch sensing network are obtained.
Its acquisition modes can send the inquiry for carrying storage address to memory by the parsing module in embodiment 1
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 are referred specifically in a detection cycle, the back of the body collected
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
Default distance completes layout, and therefore, its backlight pulse signal shows gathering after the transmission of the optical fiber of different length
Ordered arrangement on time shaft.
In step 202, each fiber switch node in current period sampled data and previous sampling period data is sensed
The numerical value of device pulse peak positions asks for difference.
Here it is using each fiber switch junction sensor pulse peak positions confirmed in step 201 as reference, and with list
To calculate, the carry out of granularity one by one is above-mentioned to take difference operation process to one fiber switch junction sensor.
In step 203, if the 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 convenient
A certain possible situation, wherein, the corresponding determination methods occurred in the first fiber switch junction sensor can equally be well applied to
Other fiber switch junction sensors, will not be repeated here in fiber switch sensing network.
In step 204, if the difference corresponding to the first fiber switch junction sensor is more than previous sampling period data
In the fiber switch sensing node pulse peak positions data the first percentage, change 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 on off 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 the order of sensing node in sensing network, number and its peak value of pulse sample data sequence within the sampling period
Position, so as to foundation backwards to pulsed light and its pulsed light peak strength, sequential and time slot according to the accurate predicate node of sequence node
On off state.Solve and be difficult to find that enough communications equipment rooms dispose nearby and set for handling the signal resolution of reflected light signal
Standby technical barrier, detection network system is simplified, improve the efficiency of detecting system dimension, and reduce maintenance cost.
In implementation process of the embodiment of the present invention, the present sample data in step 202, as shown in figure 11, specifically by with
Lower execution step obtains：
In step 2011, according to sampling, staggeredly interval t1 sends forward pulse light to fiber switch sensing network, and opens
Beginning data sampling；
Wherein, the pulsewidth w of the forward pulse light is less than or equal to 3 microseconds, also, is equipped in fiber switch sensing network
There is the distance between each fiber cable cross connection box of fiber switch junction sensor to be more than 300m.
Wherein, the setting of above-mentioned parameter value is specifically and obtained according to following theory deduction：(its material is quartz to ordinary optic fibre
Glass) in, photon is propagated in the form of total reflection, therefore delay, speed meeting occurs in the propagation to pass through
Reduce, about 2/3rds of vacuum light speed, about 200000km/s, pulsewidth may cause to be smaller than when being more than 3 microsecond
Two of 300m two sensor nodes reflection produce the overlapping of signal backwards to pulsed light so that the present invention is difficult to differentiate between difference
Sensing node is less than 3 microseconds and can made backwards to the position in the high level section in time-domain signal of pulsed optical signals, pulsewidth
The sensing node minimum spacing for the system of obtaining reaches 300m, meets the demand of most actual spacing of optical cross box in application.
The data sampling obtains current sample period with sample frequency F and the t2 collections of sampling duration backwards to pulsed optical signals
Data, wherein, the sampling duration t2 and the sample frequency F are preset value；The sampling duration of the data acquisition module
T2 is more than the duration for being issued to from a forward pulse optical signal and receiving last between pulsed optical signals.According to above-mentioned
Limiting mode, it is generally the case that sampling duration t2 value meets：0.05ms≤t2≤1ms.Wherein, last 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.
Grow to be more than to be issued to from a forward pulse optical signal when shortening sampling and receive last backwards to pulsed light letter
Duration between number, the operating time of data acquisition module in the single sampling period can be reduced, reduce system power dissipation；During sampling
The long 0.05ms that is more than or equal to can meet round demand of the pulsed light in 5km light paths, and pulsed light is in 100 kilometers of light path
In come and go the required time be about 1ms, the light path more than 100 kilometers, pulsed light may be lost totally, the sampling longer than 1ms
Duration may bring a large amount of insignificant sampled datas and system load, and this example allows the maximum light that detection method is supported
Road distance is in 5km to 100km.
In step 2012, the content that is obtained according to the data sampling parses each light in fiber switch sensing network
Peak value of pulse of the fine switching node sensor on respective pulses peak.
Wherein, shown sample frequency F is more than or equal to 2 times of obtained parameter values by 1 second divided by the business of 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 start to sample by the rising edge triggering of the pulse electrical signal.Optical circulator causes preceding to arteries and veins
Wash off while be not emitted directly toward photo-detector, avoid backwards to pulsed light directive pulse light generator, reduce pulsed light and exist
Loss in light path.Start both instruction and forward pulse optical signals of data sampling to be simultaneously emitted by so that data acquisition module
After the instruction for starting data sampling is received every time, the peak value backwards to pulsed optical signals of each fiber switch sensing node reflection
Position keeps fixing in each sampling period.
Wherein, a kind of preferable implementation be present, the pulse signal form of the forward pulse light is square-wave signal.Cause
For the time shared by the rising edge and trailing edge of square-wave signal is 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 business 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 present invention additionally provides a preferable staggeredly interval time section, is specifically less than 1 second.Because optical cable
The duration of enabling or the shutdown action of cross-connecting box is generally less than 500 milliseconds, when C value is more than between 500 milliseconds divided by sampling
Every t1 business, buffer can store over multiple periodic sampling data of duration needed for sensing node state change, buffer
The data of middle storage are enough sensing node state change caused by the enabling for judging fiber cable cross connection box or shutdown action.
With reference to the embodiment of the present invention, a kind of preferable implementation be present, the specific pulse light generator can be with
For sending direct current light, the direct current light is used for the light loss that fiber switch sensing network main line is checked using light power meter.By
Substantial amounts of fiber coupling point be present in the main line of fiber switch sensing network, the coupling mass of these Coupling points determines optical signal
Loss in main line, the direct current light sent by pulse light generator can make using light power meter to end on main line or reflection
The light power stabilising reading of receiving terminal is possibly realized.
Embodiment 4:
Providing pulsed light fiber switch condition detecting system as described in Example 1 and the pulse described in embodiment 2
After light fiber switch condition detection method, part of the embodiment of the present invention is real from how to run in the detecting system described in embodiment 1
The detection method angle described in example 2 is applied, technical scheme proposed by the invention is illustrated more completely to perform flow.Such as Figure 12
Shown, the execution flow includes：
In step 301, timer sends Periodic triggers to pulse light generator.
Wherein, the cycle 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 cycle design parameter performance.
In step 302, pulse light generator be simultaneously emitted by after Periodic triggers are received 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 photo-detector except being sequentially connected
Outside, it also acts the effect of the photo-detector and the driver of pulse point signal filter and amplification module, i.e., described data are adopted
Collect module can also adjust the photo-detector and pulse telecommunications according to the signal to noise ratio of gathered data, the intensity etc. of gathered data
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
Connected according to acquisition module as photo-detector with the electrical equipment of the driving equipment of pulse electrical signal filter and amplification module).
In step 303, data acquisition module starts after sampling instruction with sample frequency F and sampling duration t2 receiving
Collection obtains the data of current sample period backwards to pulsed optical signals.
Wherein, sample frequency F and sampling duration t2 apolegamy may be referred to related content in embodiment 1 and embodiment 2,
This is repeated no more.However, the extension implementation as the embodiment of the present invention, can also be that the detecting system sets up a ginseng
Number input interfaces, wherein be available for operating personnel input parameter include fiber switch sensing network in 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 be with generation and current optical fiber switch sensing network when getting the parameter of above-mentioned input
Pulsed optical signals, detection cycle, data acquisition duration, photo-detector detection sensitivity and the pulse electrical signal filtering being adapted to are put
One or more in big module multiplication 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, will not be repeated here.Above-mentioned processor can be replaced by the parsing module
In generation, the structure appended after control signaling linking relationship is as shown in figure 13, and wherein dotted line is control signaling；Can also be to be described
Pulse fiber switch state detecting system is additionally set, and it is with timer, pulse light generator, data acquisition module etc. establishes
There is signal to control link, its attachment structure is as shown in figure 14.
In step 304, denoising module carries out further denoising to current sample period data.
Wherein, denoising process may be referred to existing method realization, and it is that the embodiment of the present invention to be protected that how denoising, which is not,
Shield and the main points illustrated, therefore, are repeated 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 entered into by operating personnel in memory or
Operating personnel give the fiber switch junction sensor of the processor or analysis module typing fiber switch sensing network
After quantity, the distribution of pulsed optical signals and the quantitative analysis backwards that are obtained by test obtain each sensing node peak value of pulse
Position., 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, complete the renewal of each sensing node pulse peak positions stored in memory.
Within step 306, by each optical fiber in the current period sampled data after the denoising and previous sampling period data
The numerical value of switching node sensing node pulse peak positions asks for 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 digital independent 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, then performs step 309；Otherwise step 308 is performed.
In step 308, the optical fiber changed in the state of fiber switch junction sensor and location revision memory is opened
The state recording of joint point sensor.Return to step 301 and carry out the forward pulse optical signal transmission of next cycle and backwards to arteries and veins
The collection of pulsed light signal.
In a step 309, delustring discrimination module caching current sample period data.Return to step 301 and carry out next week
The forward pulse optical signal of phase is sent and the collection backwards to pulsed optical signals.
What deserves to be explained is information exchange, implementation procedure between module, unit in above-described embodiment 1 in system etc.
Content, due to being based on same design with the processing method embodiment 2 of the present invention, can mutually it be referred in both content descriptions,
Here is omitted.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of pulsed light fiber switch condition detecting system, it is characterised in that detecting system includes：Timer, pulsed light hair
Raw module, optical circulator, fiber switch sensing network, photo-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 connect the pulsed light and module, fiber switch sensing network and photo-detector occur respectively；
The delivery outlet of the photo-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.
2. pulsed light fiber switch condition detecting system according to claim 1, it is characterised in that in the optical circulator
The ring of light is walked to being followed successively by first port, second port and the 3rd port.
3. pulsed light fiber switch condition detecting system according to claim 2, it is characterised in that fiber switch Sensor Network
Each fiber switch junction sensor includes sensor body, optical fiber fiber management tray, fiber splitter, the first fiber optic collimator in network
Device, the second optical fiber collimator, movable slider and elastic component, first optical fiber collimator and the second optical fiber collimator interval
Setpoint distance is accommodating to be positioned in the sensor body, and first optical fiber collimator and second optical fiber collimator are real
Existing Gaussian Beam Coupling；Higher level's optical fiber is penetrated after the first port from the fiber entrance of the optical fiber fiber management tray and disk fibre is set
After measured length, passed from the fiber outlet of the optical fiber fiber management tray, then access the input of the fiber splitter；The light
Fine optical splitter is connected by an output end with the input of first optical fiber collimator, and the fiber splitter passes through an output
End is connected with the subordinate's optical fiber accessed through the 3rd port；The output end of second optical fiber collimator with through second end
The local fiber connection of mouth access；There is light hole in the middle part of the movable slider, the movable slider is located at first optical fiber
It between collimater and second optical fiber collimator, and can be slided in the sensor body, make the light hole connection institute
The first optical fiber collimator and second optical fiber collimator are stated, forms light path thang-kng；Or the light hole is set to stagger described
One optical fiber collimator and second optical fiber collimator, form light path block, the elastic component be folded in the movable slider with
Between sensor body.
4. pulsed light fiber switch condition detecting system according to claim 2, it is characterised in that the timer is used for
According to sampling, staggeredly t1 trigger pulses light generation module in interval sends forward pulse light；
Pulsed light occurs module and is additionally operable to sending forward pulse light simultaneously, and trigger data acquisition module starts data sampling.
5. pulsed light fiber switch condition detecting system according to claim 4, it is characterised in that the forward pulse light
Pulse signal form be square-wave signal, the data acquisition module is used to trigger in the leading edge position of the pulse electrical signal
Start data sampling.
6. the pulsed light fiber switch condition detecting system according to claim 4 or 5, it is characterised 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 more than or equal to by 1 second divided by described
2 times of obtained parameter values of the business of pulsewidth.
7. according to any described pulsed light fiber switch condition detecting system of claim 6, it is characterised in that the data are adopted
Collection module is used to receive described start after sampling instructs with sample frequency F and the t2 collections of sampling duration backwards to pulsed optical signals
The data of current sample period are obtained, wherein, the sampling duration t2 and sample frequency F is preset value；
The sampling duration t2 of the data acquisition module, which is more than to be issued to from a forward pulse optical signal, receives last back of the body
To the duration between pulsed optical signals.
8. pulsed light fiber switch condition detecting system according to claim 7, it is characterised in that the sampling duration t2
Value also meet：0.05ms≤t2≤1ms；Wherein, with pulsed light module and photo-detector occur for fiber switch junction sensor
The round optical path distance formed is between 5km to 100km.
9. pulsed light fiber switch condition detecting system according to claim 1, it is characterised in that the pulsed light occurs
Device can be also used for sending direct current light, and the direct current light is examined for the light loss on fiber switch sensing network main line.
10. according to any described pulsed light fiber switch condition detecting systems of claim 1-3, it is characterised in that the light
Circulator and pulsed light occur between module, fiber switch sensing network and photo-detector used optical fiber for G.652D,
G.652C, G.652B or G.652A, the centre wavelength for the pulsed optical signals that the pulse light generator is sent for 1310nm or
Person 1550nm.
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