CN105959058B - A kind of device and method of quick detection TDM optical network link failure - Google Patents
A kind of device and method of quick detection TDM optical network link failure Download PDFInfo
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- CN105959058B CN105959058B CN201610398542.8A CN201610398542A CN105959058B CN 105959058 B CN105959058 B CN 105959058B CN 201610398542 A CN201610398542 A CN 201610398542A CN 105959058 B CN105959058 B CN 105959058B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
Abstract
The present invention relates to Networks of Fiber Communications fault detection technique, is specifically a kind of device and method of quick detection TDM optical network link failure.The present invention solves the problems, such as that existing time division multiplexing passive optical network fault detection technique calculating data volume is big, detection speed is low.A kind of device of quick detection TDM optical network link failure, including TDM optical network and detection device；The TDM optical network includes optical transmitter and receiver, feeder fiber, optical splitter, n+1 roots optical fiber, the n optical network unit on 1 point of n+1 road；Semiconductor laser of the detection device including no isolator, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus, n+1 light feedback device.The present invention is suitable for time division multiplexing passive optical network fault detection.
Description
Technical field
The present invention relates to Networks of Fiber Communications fault detection technique, is specifically a kind of quick detection TDM optical network chain
The device and method of road failure.
Background technology
Be time-multiplexed passive optical network（TDM-PON, Time Division Multiplexed Passive Optical
Network）Traffic rate have reached 100Gbps.Communication for high-speed, once communication disruption, the information of loss will
It is difficult to count.If as soon as a second detection locating network fault can be done sth. in advance, it is avoided that hundreds of Gbit information are lost.Therefore, the time-division
The fault detect of multiplexing passive optical network is particularly important.
Currently used time division multiplexing passive optical network fault detection method is to use optical time domain reflectometer（OTDR,
Optical Time-Domain Reflectometry）All branches are detected one by one.Such a detection method is due to itself principle
Limited, there are the problem of spatial resolution is low, complicated, sensitivity is low, dynamic range is small.Chinese patent
ZL201410515353.5 discloses a kind of device and method for monitoring TDM optical network link failure.Such a detection technique
Solve the problems, such as that above-mentioned detection method spatial resolution is low, complicated, sensitivity is low, dynamic range is small, but its by
Limited in itself principle, exist and calculate the problem of data volume is big, detection speed is low.Based on this, it is necessary to invent a kind of brand-new
Be time-multiplexed passive optical network fault detection technique, and number is calculated to solve existing time division multiplexing passive optical network fault detection technique
According to the problem of amount is big, detection speed is low.
The content of the invention
The present invention calculates that data volume is big, detection speed to solve existing time division multiplexing passive optical network fault detection technique
A kind of the problem of low, there is provided device and method of quick detection TDM optical network link failure.
The present invention adopts the following technical scheme that realization：
A kind of device of quick detection TDM optical network link failure, including TDM optical network and detection fill
Put；
The TDM optical network includes optical transmitter and receiver（OLT, Optical Line Terminal）, feeder fiber, 1 point of n
Optical splitter, n+1 roots optical fiber, the n optical network unit on+1 tunnel（ONU, Optical Network Unit）；In n+1 root optical fiber most
For 1 short optical fiber as branch optical fibers are referred to, remaining n roots optical fiber is used as branch optical fibers；Optical transmitter and receiver is by feeder fiber with dividing
The common port connection of light device；1 drop two port being connected in n+1 drop two port of optical splitter with reference arm optical fiber is defined as the 1st
Drop two port, remaining n drop two port are respectively defined as the 2nd to the (n+1)th drop two port；2nd to the (n+1)th drop two port of optical splitter passes through n
Root branch optical fibers and the incident end face of n optical network unit connect one to one；The length of 1st branch optical fibers is more than with reference to branch
The length of road optical fiber；The length of i+1 root branch optical fibers is more than the length of i-th branch optical fibers；The length of 1st branch optical fibers
And the difference of the length of n-th branch optical fibers is less than or equal to the difference of the length of the 1st branch optical fibers and the length of reference arm optical fiber
1/10th；The difference of the length of n-th branch optical fibers and the length of reference arm optical fiber is less than L meters；L is the detection length of setting
Degree；Wherein, L is less than or equal to the one thousandth of S；S for no isolator semiconductor laser away from (n+1)th light feedback device away from
From；I is positive integer, and 1≤i≤n-1；
Semiconductor laser of the detection device including no isolator, coupler, optically coupled device, photodetector,
Signal acquisition and processing apparatus, n+1 light feedback device；The semiconductor laser of no isolator is connected with coupler；Coupler
The input terminal of large scale output terminal and optically coupled device connects, the small scale output terminal of coupler and the input terminal of photodetector
Connection；Optically coupled device is installed on feeder fiber；The output terminal of photodetector and the input terminal of signal acquisition and processing apparatus
Connection；The equal position of semiconductor laser, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus without isolator
In optical transmitter and receiver side；1st light feedback device is installed on the end of reference arm optical fiber, the 2nd to the (n+1)th light feedback device one
One correspondence is installed on the 1st to the n-th branch optical fibers；2nd to the (n+1)th light feedback device, which corresponds, is located at n optical-fiber network
Unit side.
A kind of method of quick detection TDM optical network link failure（This method is of the present invention a kind of quick
Detect and realized in the device of TDM optical network link failure）, this method is using following steps realization：
1）After the completion of TDM optical network laying, following steps are proceeded by：
1.1）Semiconductor laser laser without isolator；The laser launched is attached together through coupler, optocoupler successively
Put and be coupled into feeder fiber, and reference arm optical fiber and n root branch optical fibers are divided into through optical splitter, then through n+1 light feedback dress
Backtracking is put to the semiconductor laser of no isolator so that it is defeated that the semiconductor laser of no isolator produces Nonlinear Dynamic
Go out, Nonlinear Dynamic output is transmitted to photodetector through coupler, and is transmitted to after photodetector is converted to electric signal
Signal acquisition and processing apparatus；
1.2）Signal acquisition and processing apparatus receives the electric signal of t seconds, and the electric signal received is carried out autocorrelation calculation,
Thus autocorrelator trace is obtained；Wherein t=L/v, v are the speed that laser is propagated in a fiber；
1.3）At this time, there are multiple relevant peaks on diverse location in addition to zero point in autocorrelator trace；The plurality of relevant peaks
Two parts are divided into according to position：For a part close to the position of zero point, which is the interference region of this method；Another part is remote
The position of zero point, the position are the effective coverage of this method；N relevant peaks and n roots branch optical fibers one in effective coverage are a pair of
Should；
1.4）The light feedback device on each road is disconnected or removed one by one, and repeats step 1.2）；At this time, in effective coverage
Relevant peaks weaken or disappear one by one, mark step 1.3 accordingly）Branch in gained autocorrelator trace corresponding to each relevant peaks
Road optical fiber；
2）After TDM optical network brings into operation, constantly repeat step 1.1）-1.2）, and will every time obtain
Autocorrelator trace and step 1.3）In autocorrelator trace contrasted：
2.1）If n relevant peaks in effective coverage weaken or disappear at the same time, show that trouble point is located at reference arm light
On fibre；
2.2）If certain 1 relevant peaks in effective coverage weaken or disappear, show that trouble point is located at and the relevant peaks institute
On corresponding branch optical fibers；
2.3）If certain several relevant peaks in effective coverage weaken or disappear, show trouble point positioned at related to these
On branch optical fibers corresponding to peak.
Compared with existing time division multiplexing passive optical network fault detection technique, a kind of quick detection time-division of the present invention
The device and method of multiplexed optical network link failure is additionally arranged 1 reference arm optical fiber, its end is not connected to optical network unit, and
The length of n root branch optical fibers is pre-set, it only needs the electric signal of t seconds carrying out autocorrelation calculation, you can quickly detects
The failure for the passive optical network that is time-multiplexed, thus greatly reduces calculating data volume, significantly improves detection speed.
Due to the disturbance of exterior multiple feedback lights, semiconductor laser can produce the chaotic laser light with multi-cavity feature.Respectively
The resonance phenomena occurred between a chamber, also occurs secondary lobe in the position of the difference of correlation curve lumen-chamber.Each in the present invention
The feedback on road is similar to different feedback cavities, and the difference of the chamber length of different branch can produce in autocorrelator trace in the position of optical path difference
Raw relevant peaks, based on this design, only detect the data of length-specific, it can be achieved that detection to each membership.
Practice have shown that compared with existing time division multiplexing passive optical network fault detection technique, detection speed of the invention carries
High at least three orders of magnitude.It is of the invention in dotted line frame as shown in figure 4, being the display area of the prior art in solid box
Display area.As seen in Figure 4：The prior art must detect the data of S length so as to judge trouble unit, and this hair
Bright only just to can determine that trouble unit by detecting the data of L length, since L is much smaller than S, the detection speed of the present invention is far high
In the detection speed of the prior art.
The present invention efficiently solves existing time division multiplexing passive optical network fault detection technique and calculates that data volume is big, detection speed
The problem of low is spent, suitable for time division multiplexing passive optical network fault detection.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the device of quick detection TDM optical network link failure of the present invention
Figure.
Fig. 2 is a kind of the first principle of the method for quick detection TDM optical network link failure of the present invention
Schematic diagram.
Fig. 3 is a kind of second of principle of the method for quick detection TDM optical network link failure of the present invention
Schematic diagram.
Fig. 4 is that a kind of method of quick detection TDM optical network link failure of the present invention is answered with the existing time-division
With the contrast schematic diagram of passive optical network fault detection technique.
Embodiment
Embodiment one
A kind of device of quick detection TDM optical network link failure, including TDM optical network and detection fill
Put；
Optical splitter, n+1 root optical fiber, n of the TDM optical network including optical transmitter and receiver, feeder fiber, 1 point of n+1 road are a
Optical network unit；For shortest 1 optical fiber as branch optical fibers are referred to, remaining n roots optical fiber is used as branch light in n+1 root optical fiber
It is fine；Optical transmitter and receiver is connected by the common port of feeder fiber and optical splitter；In n+1 drop two port of optical splitter with reference arm optical fiber
1 drop two port of connection is defined as the 1st drop two port, remaining n drop two port is respectively defined as the 2nd to the (n+1)th drop two port；Optical splitter
The 2nd to the (n+1)th drop two port connected one to one by n roots branch optical fibers and the incident end face of n optical network unit；1st
The length of branch optical fibers is more than the length of reference arm optical fiber；The length of i+1 root branch optical fibers is more than i-th branch optical fibers
Length；The difference of the length of 1st branch optical fibers and the length of n-th branch optical fibers is less than or equal to the length of the 1st branch optical fibers
And 1/10th of the difference of the length of reference arm optical fiber；The length of n-th branch optical fibers and the length of reference arm optical fiber it
Difference is less than L meters；L is the detection length of setting；Wherein, L is less than or equal to the one thousandth of S；S for no isolator semiconductor laser
Distance of the device away from (n+1)th light feedback device；I is positive integer, and 1≤i≤n-1；
Semiconductor laser of the detection device including no isolator, coupler, optically coupled device, photodetector,
Signal acquisition and processing apparatus, n+1 light feedback device；The semiconductor laser of no isolator is connected with coupler；Coupler
The input terminal of large scale output terminal and optically coupled device connects, the small scale output terminal of coupler and the input terminal of photodetector
Connection；Optically coupled device is installed on feeder fiber；The output terminal of photodetector and the input terminal of signal acquisition and processing apparatus
Connection；The equal position of semiconductor laser, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus without isolator
In optical transmitter and receiver side；1st light feedback device is installed on the end of reference arm optical fiber, the 2nd to the (n+1)th light feedback device one
One correspondence is installed on the 1st to the n-th branch optical fibers；2nd to the (n+1)th light feedback device, which corresponds, is located at n optical-fiber network
Unit side.
The wave-length coverage of the semiconductor laser of the no isolator is 1600nm-1700nm, output power 1mW-1W；
The coupler is the photo-coupler that coupling ratio is 1 point 2, wherein the coupling ratio on 1 tunnel is more than or equal to 60%；The optically coupled device
It is 50 for wavelength division multiplexer or coupling ratio：50 photo-coupler；The photodetector for can response wave length scope be 1600nm-
1700nm and bandwidth are less than the high-speed photodetector of 50GHz；The signal acquisition and processing apparatus is less than the list of 50GHz by bandwidth
Road signal pickup assembly with can carry out the digital correlator of autocorrelation calculation or computer connects composition.
The smooth feedback device by wavelength division multiplexer and can reflected wavelength range be 1600nm-1700nm fiber reflector
Connection composition, either uses wave-length coverage to be plated on branch optical fibers for the reflective fiber grating of 1600nm-1700nm or use
Distal end faces and can reflected wavelength range be 1600nm-1700nm high-reflecting film, or using being plated on connecing for optical network unit
Receiving end face and can reflected wavelength range be 1600nm-1700nm high-reflecting film.
In the present embodiment, the difference of the length of i+1 root branch optical fibers and the length of i-th branch optical fibers is definite value（Such as
Shown in Fig. 2, the distance between two neighboring relevant peaks are definite value x in n relevant peaks）.
A kind of method of quick detection TDM optical network link failure（This method is of the present invention a kind of quick
Detect and realized in the device of TDM optical network link failure）, this method is using following steps realization：
1）After the completion of TDM optical network laying, following steps are proceeded by：
1.1）Semiconductor laser laser without isolator；The laser launched is attached together through coupler, optocoupler successively
Put and be coupled into feeder fiber, and reference arm optical fiber and n root branch optical fibers are divided into through optical splitter, then through n+1 light feedback dress
Backtracking is put to the semiconductor laser of no isolator so that it is defeated that the semiconductor laser of no isolator produces Nonlinear Dynamic
Go out, Nonlinear Dynamic output is transmitted to photodetector through coupler, and is transmitted to after photodetector is converted to electric signal
Signal acquisition and processing apparatus；
1.2）Signal acquisition and processing apparatus receives the electric signal of t seconds, and the electric signal received is carried out autocorrelation calculation,
Thus autocorrelator trace is obtained；Wherein t=L/v, v are the speed that laser is propagated in a fiber；
1.3）At this time, there are multiple relevant peaks on diverse location in addition to zero point in autocorrelator trace；The plurality of relevant peaks
Two parts are divided into according to position：For a part close to the position of zero point, which is the interference region of this method；Another part is remote
The position of zero point, the position are the effective coverage of this method；N relevant peaks and n roots branch optical fibers one in effective coverage are a pair of
Should；
1.4）The light feedback device on each road is disconnected or removed one by one, and repeats step 1.2）；At this time, in effective coverage
Relevant peaks weaken or disappear one by one, mark step 1.3 accordingly）Branch in gained autocorrelator trace corresponding to each relevant peaks
Road optical fiber；
2）After TDM optical network brings into operation, constantly repeat step 1.1）-1.2）, and will every time obtain
Autocorrelator trace and step 1.3）In autocorrelator trace contrasted：
2.1）If n relevant peaks in effective coverage weaken or disappear at the same time, show that trouble point is located at reference arm light
On fibre（" reference arm failure i.e. shown in Fig. 2（Failure I）”）；
2.2）If certain 1 relevant peaks in effective coverage weaken or disappear, show that trouble point is located at and the relevant peaks institute
On corresponding branch optical fibers（" single spur track failure i.e. shown in Fig. 2（Failure II）”）；
2.3）If certain several relevant peaks in effective coverage weaken or disappear, show trouble point positioned at related to these
On branch optical fibers corresponding to peak（" multiple branch circuit failure i.e. shown in Fig. 2（Failure III）”）.
Embodiment two
A kind of device of quick detection TDM optical network link failure, including TDM optical network and detection fill
Put；
Optical splitter, n+1 root optical fiber, n of the TDM optical network including optical transmitter and receiver, feeder fiber, 1 point of n+1 road are a
Optical network unit；For shortest 1 optical fiber as branch optical fibers are referred to, remaining n roots optical fiber is used as branch light in n+1 root optical fiber
It is fine；Optical transmitter and receiver is connected by the common port of feeder fiber and optical splitter；In n+1 drop two port of optical splitter with reference arm optical fiber
1 drop two port of connection is defined as the 1st drop two port, remaining n drop two port is respectively defined as the 2nd to the (n+1)th drop two port；Optical splitter
The 2nd to the (n+1)th drop two port connected one to one by n roots branch optical fibers and the incident end face of n optical network unit；1st
The length of branch optical fibers is more than the length of reference arm optical fiber；The length of i+1 root branch optical fibers is more than i-th branch optical fibers
Length；The difference of the length of 1st branch optical fibers and the length of n-th branch optical fibers is less than or equal to the length of the 1st branch optical fibers
And 1/10th of the difference of the length of reference arm optical fiber；The length of n-th branch optical fibers and the length of reference arm optical fiber it
Difference is less than L meters；L is the detection length of setting；Wherein, L is less than or equal to the one thousandth of S；S for no isolator semiconductor laser
Distance of the device away from (n+1)th light feedback device；I is positive integer, and 1≤i≤n-1；
Semiconductor laser of the detection device including no isolator, coupler, optically coupled device, photodetector,
Signal acquisition and processing apparatus, n+1 light feedback device；The semiconductor laser of no isolator is connected with coupler；Coupler
The input terminal of large scale output terminal and optically coupled device connects, the small scale output terminal of coupler and the input terminal of photodetector
Connection；Optically coupled device is installed on feeder fiber；The output terminal of photodetector and the input terminal of signal acquisition and processing apparatus
Connection；The equal position of semiconductor laser, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus without isolator
In optical transmitter and receiver side；1st light feedback device is installed on the end of reference arm optical fiber, the 2nd to the (n+1)th light feedback device one
One correspondence is installed on the 1st to the n-th branch optical fibers；2nd to the (n+1)th light feedback device, which corresponds, is located at n optical-fiber network
Unit side.
The wave-length coverage of the semiconductor laser of the no isolator is 1600nm-1700nm, output power 1mW-1W；
The coupler is the photo-coupler that coupling ratio is 1 point 2, wherein the coupling ratio on 1 tunnel is more than or equal to 60%；The optically coupled device
It is 50 for wavelength division multiplexer or coupling ratio：50 photo-coupler；The photodetector for can response wave length scope be 1600nm-
1700nm and bandwidth are less than the high-speed photodetector of 50GHz；The signal acquisition and processing apparatus is less than the list of 50GHz by bandwidth
Road signal pickup assembly with can carry out the digital correlator of autocorrelation calculation or computer connects composition.
The smooth feedback device by wavelength division multiplexer and can reflected wavelength range be 1600nm-1700nm fiber reflector
Connection composition, either uses wave-length coverage to be plated on branch optical fibers for the reflective fiber grating of 1600nm-1700nm or use
Distal end faces and can reflected wavelength range be 1600nm-1700nm high-reflecting film, or using being plated on connecing for optical network unit
Receiving end face and can reflected wavelength range be 1600nm-1700nm high-reflecting film.
In the present embodiment, the difference of the length of i+1 root branch optical fibers and the length of i-th branch optical fibers is unequal（Such as
Shown in Fig. 3, the distance between two neighboring relevant peaks are unequal in n relevant peaks）.
A kind of method of quick detection TDM optical network link failure（This method is of the present invention a kind of quick
Detect and realized in the device of TDM optical network link failure）, this method is using following steps realization：
1）After the completion of TDM optical network laying, following steps are proceeded by：
1.1）Semiconductor laser laser without isolator；The laser launched is attached together through coupler, optocoupler successively
Put and be coupled into feeder fiber, and reference arm optical fiber and n root branch optical fibers are divided into through optical splitter, then through n+1 light feedback dress
Backtracking is put to the semiconductor laser of no isolator so that it is defeated that the semiconductor laser of no isolator produces Nonlinear Dynamic
Go out, Nonlinear Dynamic output is transmitted to photodetector through coupler, and is transmitted to after photodetector is converted to electric signal
Signal acquisition and processing apparatus；
1.2）Signal acquisition and processing apparatus receives the electric signal of t seconds, and the electric signal received is carried out autocorrelation calculation,
Thus autocorrelator trace is obtained；Wherein t=L/v, v are the speed that laser is propagated in a fiber；
1.3）At this time, there are multiple relevant peaks on diverse location in addition to zero point in autocorrelator trace；The plurality of relevant peaks
Two parts are divided into according to position：For a part close to the position of zero point, which is the interference region of this method；Another part is remote
The position of zero point, the position are the effective coverage of this method；N relevant peaks and n roots branch optical fibers one in effective coverage are a pair of
Should；
1.4）The light feedback device on each road is disconnected or removed one by one, and repeats step 1.2）；At this time, in effective coverage
Relevant peaks weaken or disappear one by one, mark step 1.3 accordingly）Branch in gained autocorrelator trace corresponding to each relevant peaks
Road optical fiber；
2）After TDM optical network brings into operation, constantly repeat step 1.1）-1.2）, and will every time obtain
Autocorrelator trace and step 1.3）In autocorrelator trace contrasted：
2.1）If n relevant peaks in effective coverage weaken or disappear at the same time, show that trouble point is located at reference arm light
On fibre（" reference arm failure i.e. shown in Fig. 3（Failure I）”）；
2.2）If certain 1 relevant peaks in effective coverage weaken or disappear, show that trouble point is located at and the relevant peaks institute
On corresponding branch optical fibers（" single spur track failure i.e. shown in Fig. 3（Failure II）”）；
2.3）If certain several relevant peaks in effective coverage weaken or disappear, show trouble point positioned at related to these
On branch optical fibers corresponding to peak（" multiple branch circuit failure i.e. shown in Fig. 3（Failure III）”）.
Claims (6)
- A kind of 1. device of quick detection TDM optical network link failure, it is characterised in that：Including TDM optical network And detection device；The TDM optical network includes optical transmitter and receiver, feeder fiber, optical splitter, n+1 roots optical fiber, the n light net on 1 point of n+1 road Network unit；For shortest 1 optical fiber as branch optical fibers are referred to, remaining n roots optical fiber is used as branch optical fibers in n+1 root optical fiber；Light Terminal is connected by the common port of feeder fiber and optical splitter；It is connected in n+1 drop two port of optical splitter with reference arm optical fiber 1 drop two port be defined as the 1st drop two port, remaining n drop two port is respectively defined as the 2nd to the (n+1)th drop two port；The of optical splitter 2 to the (n+1)th drop two ports are connected one to one by n roots branch optical fibers and the incident end face of n optical network unit；1st branch The length of optical fiber is more than the length of reference arm optical fiber；The length of i+1 root branch optical fibers is more than the length of i-th branch optical fibers Degree；The difference of the length of 1st branch optical fibers and the length of n-th branch optical fibers be less than or equal to the length of the 1st branch optical fibers with / 10th of the difference of the length of reference arm optical fiber；The difference of the length of n-th branch optical fibers and the length of reference arm optical fiber Less than L meters；L is the detection length of setting；Wherein, L is less than or equal to the one thousandth of S；S for no isolator semiconductor laser Distance away from (n+1)th light feedback device；I is positive integer, and 1≤i≤n-1；Semiconductor laser of the detection device including no isolator, coupler, optically coupled device, photodetector, signal Acquisition processing device, n+1 light feedback device；The semiconductor laser of no isolator is connected with coupler；The big ratio of coupler The input terminal of example output terminal and optically coupled device connects, and the small scale output terminal of coupler and the input terminal of photodetector connect Connect；Optically coupled device is installed on feeder fiber；The output terminal of photodetector and the input terminal of signal acquisition and processing apparatus connect Connect；Semiconductor laser, coupler, optically coupled device, photodetector, the signal acquisition and processing apparatus of no isolator are respectively positioned on Optical transmitter and receiver side；1st light feedback device is installed on the end of reference arm optical fiber, and the 2nd to the (n+1)th light feedback device is one by one Correspondence is installed on the 1st to the n-th branch optical fibers；2nd to the (n+1)th light feedback device, which corresponds, is located at n optical-fiber network list First side.
- A kind of 2. device of quick detection TDM optical network link failure according to claim 1, it is characterised in that： The wave-length coverage of the semiconductor laser of the no isolator is 1600nm-1700nm, output power 1mW-1W；The coupling Device is the photo-coupler that coupling ratio is 1 point 2, wherein the coupling ratio on 1 tunnel is more than or equal to 60%；The optically coupled device is answered for wavelength-division It is 50 with device or coupling ratio：50 photo-coupler；The photodetector for can response wave length scope be 1600nm-1700nm and Bandwidth is less than the high-speed photodetector of 50GHz；The signal acquisition and processing apparatus is adopted by one-channel signal of the bandwidth less than 50GHz Acquisition means with can carry out the digital correlator of autocorrelation calculation or computer connects composition.
- 3. a kind of device of quick detection TDM optical network link failure according to claim 1 or 2, its feature exist In：The smooth feedback device by wavelength division multiplexer with can reflected wavelength range be 1600nm-1700nm fiber reflector connect Composition, either uses wave-length coverage for the reflective fiber grating of 1600nm-1700nm or using the end for being plated on branch optical fibers Hold end face and can reflected wavelength range be 1600nm-1700nm high-reflecting film, or using being plated on the receiving terminal of optical network unit Face and can reflected wavelength range be 1600nm-1700nm high-reflecting film.
- 4. a kind of device of quick detection TDM optical network link failure according to claim 1 or 2, its feature exist In：The difference of the length of i+1 root branch optical fibers and the length of i-th branch optical fibers is definite value.
- 5. a kind of device of quick detection TDM optical network link failure according to claim 1 or 2, its feature exist In：The difference of the length of i+1 root branch optical fibers and the length of i-th branch optical fibers is unequal.
- 6. a kind of method of quick detection TDM optical network link failure, this method is as claimed in claim 1 a kind of Realized in the device of quick detection TDM optical network link failure, it is characterised in that：This method is real using following steps Existing：1）After the completion of TDM optical network laying, following steps are proceeded by：1.1）Semiconductor laser laser without isolator；The laser launched is successively through coupler, optically coupled device coupling Feeder fiber is incorporated into, and reference arm optical fiber and n root branch optical fibers are divided into through optical splitter, it is then former through n+1 light feedback device Road is back to the semiconductor laser of no isolator so that and the semiconductor laser of no isolator produces Nonlinear Dynamic output, Nonlinear Dynamic output is transmitted to photodetector through coupler, and is transmitted to signal after photodetector is converted to electric signal Acquisition processing device；1.2）Signal acquisition and processing apparatus receives the electric signal of t seconds, and the electric signal received is carried out autocorrelation calculation, thus Obtain autocorrelator trace；Wherein t=L/v, L are the detection length of setting, and v is the speed that laser is propagated in a fiber；1.3）At this time, there are multiple relevant peaks on diverse location in addition to zero point in autocorrelator trace；The plurality of relevant peaks according to Position is divided into two parts：For a part close to the position of zero point, which is the interference region of this method；Another part is away from zero point Position, the position be this method effective coverage；N relevant peaks in effective coverage are corresponded with n roots branch optical fibers；1.4）The light feedback device on each road is disconnected or removed one by one, and repeats step 1.2）；At this time, the phase in effective coverage Guan Feng weakens or disappears one by one, marks step 1.3 accordingly）Branch light in gained autocorrelator trace corresponding to each relevant peaks It is fine；2）After TDM optical network brings into operation, constantly repeat step 1.1）-1.2）, and will obtain every time from phase Close curve and step 1.3）In autocorrelator trace contrasted：2.1）If n relevant peaks in effective coverage weaken or disappear at the same time, show that trouble point is located on reference arm optical fiber；2.2）If certain 1 relevant peaks in effective coverage weaken or disappear, show trouble point be located at the relevant peaks corresponding to Branch optical fibers on；2.3）If certain several relevant peaks in effective coverage weaken or disappear, show that trouble point is located at and these relevant peaks institutes On corresponding branch optical fibers.
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| CN110266374B (en) * | 2019-05-26 | 2021-08-20 | 太原理工大学 | Device and method capable of monitoring TDM-PON secondary branch circuit fault with high precision |
| CN110266375B (en) * | 2019-05-26 | 2022-06-14 | 太原理工大学 | TWDM-PON-oriented high-precision fault monitoring device and method |
| CN111010228B (en) * | 2019-11-19 | 2023-01-13 | 华为技术有限公司 | Port identification method, device and system and optical splitter |
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