CN110266375A - High-precision fault monitoring device and method towards TWDM-PON - Google Patents
High-precision fault monitoring device and method towards TWDM-PON Download PDFInfo
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- CN110266375A CN110266375A CN201910443090.4A CN201910443090A CN110266375A CN 110266375 A CN110266375 A CN 110266375A CN 201910443090 A CN201910443090 A CN 201910443090A CN 110266375 A CN110266375 A CN 110266375A
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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]
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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
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0771—Fault location on the transmission path
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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
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0773—Network aspects, e.g. central monitoring of transmission parameters
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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
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0775—Performance monitoring and measurement of transmission parameters
Abstract
The invention discloses a kind of high-precision fault monitoring device towards TWDM-PON, it is related to Networks of Fiber Communications malfunction monitoring technology, system is monitored including TWDM-PON optical network system and optical-fiber network, the former includes the array waveguide grating AWG V, second level branch VI and optical network unit VII that optical transmitter and receiver OLT I, feeder fiber II, the first order 1 divide the array waveguide grating AWG III, level-one branch IV, the second level 1 on the road n to divide the road n；The latter includes FP laser, and FP laser is connect with coupler；The large scale output end of coupler and the input terminal of optically coupled device connect, and the small scale output end of coupler and the input terminal of photodetector connect；The output end of photodetector and the input terminal of signal acquisition and processing apparatus connect；Light feedback device is installed on second level branch VI.The present invention has the advantages that can be simple in control centre's detection, high spatial resolution, high sensitivity, structure.
Description
Technical field
The present invention relates to Networks of Fiber Communications malfunction monitoring technical field, specially a kind of high-precision towards TWDM-PON
Fault monitoring device and method.
Background technique
Next-generation passive optical network (NG-PON2) project started in 2011, main to study fiber optic network technology, made to connect
The bandwidth of networking increases to 10GHz/s or more, and with the development of access net, entrained information content will also be increased considerably, net
Loss also will be increasingly severe brought by network system jam.And existing most of passive optical network monitoring system is main
Make for WDM-PON and TDM-PON optical-fiber network, therefore for the relatively more complicated network system needs one of TWDM-PON
With, economic management system for monitoring.Existing monitoring system is based primarily upon time domain, spectrum and frequency spectrum etc.:
1, peak power: power monitoring is the basic demand of any monitoring system.The Network Management System of control centre can lead to
It crosses the power monitored and reference value or threshold value is compared to determine the state of network.
2, mean power: improving measuring signal using the method for average, rather than one-shot measurement.Compared with reference value,
Any variation of the mean power can mean that the damage or failure of optical-fiber network.
3. power spectrum: the power for the identification frequency that some detection systems are received dependent on measurement monitors these frequencies
The state of power decision optical-fiber network.
4, spectrum: the wavelength that some monitoring word interface differential techniques receive is monitored, and wavelength loss means specific branch
It breaks down or damages.
The fault detection method of existing method much depends on optical time domain reflectometer (OTDR), it passes through in observation optical fiber
Retroeflection and Rayleigh scattering signal, and then detect, judge exception in link.However optical time domain reflectometer (OTDR) applies to
There are some defects for optical network fault detection, distinguish very much the reverse signal of each branch of optical-fiber network first；Secondly OTDR exists empty
Between theoretical contradiction between resolution ratio and dynamic range, i.e., it need sufficiently wide light pulse to guarantee echo power, but it is wider
Pulse width reduce spatial resolution；Finally, containing devices such as power dividers in optical-fiber network, insertion loss is high.
Therefore, for TWDM-PON optical-fiber network, it is necessary to inventing one kind can monitor in real time in control terminal, and structure is simple,
Interference is not generated to transmission signal, and can identify that branch and failure are accurately positioned, high-precision, the monitoring technology of long range.
Summary of the invention
The present invention monitors in real time in order to solve in TWDM-PON optical-fiber network, to failure and realizes the identification and event of fault branch
The problem of positioning of barrier, provides a kind of high-precision fault monitoring device and method towards TWDM-PON.
The present invention is achieved by the following technical solution: a kind of high-precision malfunction monitoring dress towards TWDM-PON
It sets, including TWDM-PON optical network system and optical-fiber network monitor system；The TWDM-PON optical network system includes optical transmitter and receiver OLT
I, the array wave that feeder fiber II, the first order 1 divide the array waveguide grating AWG III, level-one branch IV, the second level 1 on the road n to divide the road n
Guide grating AWG V, second level branch VI and optical network unit VII, the optical transmitter and receiver OLT I pass through the battle array of feeder fiber II and 1 point of road n
N drop two port of the connection of train wave guide grating AWG III, the array waveguide grating AWG III on 1 point of road n passes through n root level-one branch
IV divides the array waveguide grating AWG V on the road n to connect one to one with the n second level 1；The Waveguide array on the road n is divided in each second level 1
The n drop two port of grating AWG V is connected one to one by n root second level branch VI and the input terminal of n optical network unit VII；Institute
State optical-fiber network monitoring system include FP laser, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus and
Light feedback device；The FP laser is connect with coupler；The large scale output end of the coupler and optically coupled device it is defeated
Enter end connection, the small scale output end of coupler and the input terminal of photodetector connect；The optically coupled device is installed on feedback
On linear light fibre II；The output end of photodetector and the input terminal of signal acquisition and processing apparatus connect；FP laser, coupler,
Optically coupled device, photodetector, signal acquisition and processing apparatus are respectively positioned on I side optical transmitter and receiver OLT；It is uniform on every second level branch VI
One correspondence is equipped with a light feedback device, and each smooth feedback device is located at corresponding VII side of optical network unit；Each light is anti-
Feedback device can reflect detection letters all different from passable wavelength and corresponding with corresponding branch, and being totally reflected the branch
Number, full by the signal of communication of the branch；The distance of each smooth feedback device distance FP laser is different, and distance is most
Small difference is greater than detection accuracy, guarantees that the correlation curve of every cluster will not be all overlapped, each in every cluster is not also overlapped.
A kind of high-precision fault monitoring method towards TWDM-PON, this method realize in above-mentioned apparatus, including as follows
Step:
1) after the completion of TWDM-PON optical network system and optical-fiber network monitoring system are laid with, start to carry out following steps:
1.1) laser of FP laser transmitting and signal of communication different wave length, i.e. signal of communication wavelength are not with detection signal wavelength
The same band；The laser emitted passes through coupler, and large scale output end is by laser signal by coupling through optically coupled device
Enter feeder fiber II, and the array waveguide grating AWG III through 1 point of road n is divided into n root level-one branch IV, n root level-one branch IV is by light
One-to-one correspondence is conveyed into the array waveguide grating AWG V that the road n is divided in the second level 1, and the array waveguide grating on the road n is divided in each second level 1
The drop two port of AWG V will detect light and enter one-to-one n light feedback device, light feedback device via n root second level branch VI
The detection light backtracking of reflection disturbs FP laser, generates FP laser under the action of light feedback to FP laser
Chaos, the wavelength and communication wavelengths of reflected light at this time are not a wave bands；The small scale output end of coupler is by light input light
Electric explorer, and convert optical signals to electric signal, electric signal input signal acquisition processing device later, by the non-of FP laser
Linear dynamic output signal acquires and carries out autocorrelative calculating, according in autocorrelator trace the case where relevant peaks, to judge light
The fault condition of network；
1.2) electric signal received is carried out autocorrelation calculation by signal acquisition and processing apparatus, and obtains autocorrelator trace；
1.3) after the completion of fault monitoring system is built, in the case where guaranteeing optical-fiber network normal communication, complete optical network system is carried out
Complete measurement, occur multiple relevant peaks on different location in addition to 0 point in the processing of autocorrelator trace, in each level-one branch
There is the correlation of cluster cluster due to the influence of VI different length of second level branch in second level branch VI under IV in autocorrelator trace
Peak value, every cluster correspond to each level-one branch, and each in cluster both corresponds to each second level branch；Pass through cutting
A certain level-one branch in curve so that complete the label (autocorrelator trace to the corresponding respective cluster relevant peaks of each level-one branch
In reflection peak heights it is related with the intensity of injection light)；A certain branch second level branch is cut off to complete to optical network system second level branch
The calibration of relevant peaks can be monitored in optical network system operational process later, once be surveyed to the optical-fiber network in real time
It tries and is compared with test result labeled for the first time, judge the operating condition of optical-fiber network；
2) after TWDM-PON second level optical network system brings into operation, constantly 1.2) being carried out with autocorrelator trace 1.3) pair
Than, according to difference the phenomenon that performance, judge the specific location of failure, specific as follows:
1. if the relevant peaks of all branches all become very little or disappear simultaneously in the autocorrelator trace for the FP laser that test obtains
And a relevant peaks are had more before the first cluster relevant peaks, show that the failure hinders the communication of entire optical-fiber network, then failure occurs
In feeder fiber II, such as the failure 1 and Fig. 4 in Fig. 2, corresponding fault point can be in light as a reflection unit, FP laser
Under the action of feedback, occurs a new peak value in autocorrelator trace, the position of the reflection peak corresponds to abort situation；
2. if in the autocorrelator trace of FP laser that test obtains only wherein the relevant peaks of cluster branch become very little or
It disappears, and has more a relevant peaks in other positions, show only one level-one branch Communication Block at this time, then occur in level-one
Branch optical fibers IV, as the failure 2 and Fig. 5 in Fig. 2 other positions can then occur since there are light feedbacks in autocorrelator trace
The position of one new reflection peak, the reflection peak corresponds to abort situation；
3. if a labeled relevant peaks in the autocorrelator trace of FP laser that test obtains wherein in cluster become very
Small or disappear, there is not new peak value in other positions, then failure occurs in second level branch VI, as in Fig. 2 failure 3 and
Fig. 6 then other positions a new reflection peak, the position of the reflection peak can occur in autocorrelator trace since there are light feedbacks
It sets and corresponds to abort situation；
4. if wherein the relevant peaks of more cluster branches become very little or disappearance, and there are many places respective counts before the first cluster relevant peaks
The relevant peaks of amount, then failure occurs in more level-one branches IV, as shown in fig. 7, at this time then need to be in the level-one branch of each label
In IV, checked one by one according to the position for having more relevant peaks；
5. failure occurs multiple under a level-one branch IV if multiple correlation peaks only in same cluster are varied
Second level branch VI, as shown in figure 8, need to be checked one by one in the branch of each label according to the position for having more relevant peaks at this time；
6. multiple second levels under different level-one branches IV occur for failure if multiple relevant peaks under different clusters are varied
Branch VI, as shown in figure 9, at this time in the branch of the label according to corresponding to relevant peaks, according to having more the position of relevant peaks one by one
Investigation.
The theoretical basis of a kind of high-precision fault monitoring device towards TWDM-PON of the present invention and method is as follows:
There are this features of delay characteristics to realize light net using the laser signal that FP laser generates under the action of light is fed back by the present invention
The identification of network branch and the positioning of failure.The Nonlinear Dynamic output that so-called delay characteristics refer to that FP laser generates can exist
Certain delay, and the delay is exactly that FP laser exports to feedback point and returns again to the time experienced.In the present invention, it utilizes
FP laser reflects the delay characteristics under light action in fault point, and combines the spread speed of laser in a fiber that can measure event
The position of barrier.It should be pointed out that FP laser can generate list under the action of varying strength (minimum can be to -90dB) feedback light
A variety of Non-Linear Ocsillations such as period, paracycle and chaos (Journal of Lightwave Technology, Vol 4,
No 11, pp 1655-1661,1986), but no matter which kind of vibrates the light intensity signal of semiconductor laser output always
There are delay characteristics.It is worth noting that, this time delay is characterized in FP laser to a kind of characteristic response (IEEE of external feedback light
Journal of Quantum Electronics, Vol 45, No 7, pp 879-891,2009), but one
It is directly considered as that limitation FP laser tries to be inhibited (IEEE in the adverse factor that the fields such as secret communication are applied
Photonics Journal, Vol 4, No 5, pp 1930-1935,2012).And the present invention makes full use of
This delay character, detection fiber location of fault.In addition, a profile feedback device is arranged in each branch in the present invention, it is used for
Distinguish specific branch.
It is compared with prior art the invention has the following advantages: provided by the present invention a kind of towards TWDM-PON's
High-precision fault monitoring device and method, using light feedback principle, FP laser has side lobe characteristics (other when generating chaotic laser light
Valve distance and the distance dependent between two-laser) the characteristics of, to detect Wave division multiplexing passive optical network failure.The present invention can be
Control terminal real time monitoring, structure is simple, does not generate interference to transmission signal, and can identify that branch and failure are accurately positioned, and energy
It is enough control centre's detection, high spatial resolution, high sensitivity, the Larger Dynamic range the advantages that, while application range is also relatively extensively.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is failure schematic diagram of the invention.
Fig. 3 is reference autocorrelator trace figure of the invention.
Fig. 4 is the autocorrelator trace figure of FP laser 1 when breaking down 1 in Fig. 2.
Fig. 5 is the autocorrelator trace figure of FP laser 1 when breaking down 2 in Fig. 2.
Fig. 6 is the autocorrelator trace figure of FP laser 1 when breaking down 3 in Fig. 2.
When Fig. 7 is more level-one IV failures of branch, the autocorrelator trace figure of FP laser 1.
When Fig. 8 is multiple VI failures of second level branch of a level-one branch IV, the autocorrelator trace figure of FP laser 1.
When Fig. 9 is multiple VI failures of second level branch under different level-one branches IV, the autocorrelator trace figure of FP laser 1.
Figure 10 is the first structural schematic diagram of light feedback device.
Figure 11 is second of structural schematic diagram of light feedback device.
In figure: dotted line represents herein without image.
Specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment one
A kind of high-precision fault monitoring device towards TWDM-PON includes TWDM-PON optical network system and light as shown in Figure 1:
Network monitoring system；The TWDM-PON optical network system includes that optical transmitter and receiver OLT I, feeder fiber II, the first order 1 divide the battle array on the road n
Train wave guide grating AWG III, level-one branch IV, the second level 1 divide the array waveguide grating AWG V, second level branch VI and optical-fiber network on the road n
Unit VII, connection of the optical transmitter and receiver OLT I by feeder fiber II and the array waveguide grating AWG III on 1 point of road n, 1 point of n
The n drop two port of the array waveguide grating AWG III on road divides the Waveguide array on the road n by n root level-one branch IV and the n second level 1
Grating AWG V connects one to one；Each second level 1 divides the n drop two port of the array waveguide grating AWG V on the road n to pass through n root two
Grade branch VI and the input terminal of n optical network unit VII connect one to one；The optical-fiber network monitoring system includes FP laser
1, coupler 2, optically coupled device 3, photodetector 4, signal acquisition and processing apparatus 5 and light feedback device 6；The FP laser
1 connect with coupler 2；The large scale output end of the coupler 2 is connect with the input terminal of optically coupled device 3, coupler 2 it is small
Ratio output end is connect with the input terminal of photodetector 4；The optically coupled device 3 is installed on feeder fiber II；Photoelectricity is visited
The output end for surveying device 4 is connect with the input terminal of signal acquisition and processing apparatus 5；FP laser 1, coupler 2, optically coupled device 3, light
Electric explorer 4, signal acquisition and processing apparatus 5 are respectively positioned on I side optical transmitter and receiver OLT；Installation is corresponded on every second level branch VI
There is a light feedback device 6, and each smooth feedback device 6 is located at corresponding VII side of optical network unit；Each smooth feedback device 6 can
Reflection is all different from passable wavelength and corresponding with corresponding branch, and is totally reflected the detection signal of the branch, full by
The signal of communication of the branch；The distance of each 6 distance FP laser 1 of smooth feedback device is different, the minimal difference of distance
Greater than detection accuracy, guarantee that the correlation curve of every cluster will not be all overlapped, each in every cluster is not also overlapped.
In the present embodiment: the wave-length coverage of the FP laser 1 is 1600nm-1700nm, output power 1mW-1W；Institute
Stating coupler 2 is the photo-coupler that coupling ratio is 80:20 ~ 99:1, can according to the difference of measurement range or actual conditions come
It selects, the photo-coupler of 80:20 is selected in the present embodiment；The optically coupled device 3 is wavelength division multiplexer；The photodetector
4 for can response wave length scope be 1600nm-1700nm and bandwidth be less than 50GHz high-speed photodetector；The signal acquisition
The digital correlator or meter processing unit 5 the one-channel signal acquisition device by bandwidth less than 50GHz and autocorrelation calculation can be carried out
Calculation machine connection composition；The smooth feedback device 6 by wavelength division multiplexer and can reflected wavelength range be 1600nm-1700nm optical fiber
Reflecting mirror connection composition.
A kind of high-precision fault monitoring method towards TWDM-PON, implements, including walk as follows in the present embodiment
It is rapid:
1) after the completion of TWDM-PON optical network system and optical-fiber network monitoring system are laid with, start to carry out following steps:
1.1) laser of FP laser 1 transmitting and signal of communication different wave length, i.e. signal of communication wavelength and detection signal wavelength are not
It is the same band；The laser emitted passes through coupler 2, and large scale output end passes through laser signal through optically coupled device 3
It is coupled into feeder fiber II, and the array waveguide grating AWG III through 1 point of road n is divided into n root level-one branch IV, n root level-one branch IV
Light one-to-one correspondence is conveyed into the array waveguide grating AWG V for dividing the road n in the second level 1, the Waveguide array on the road n is divided in each second level 1
The drop two port of grating AWG V will detect light and enter one-to-one n light feedback device 6, light feedback via n root second level branch VI
The detection light backtracking that device 6 reflects disturbs FP laser 1, the work for feeding back FP laser 1 in light to FP laser 1
With lower generation chaos, the wavelength and communication wavelengths of reflected light at this time are not a wave bands；The small scale output end of coupler will
Light inputs photodetector 4, and converts optical signals to electric signal, later electric signal input signal acquisition processing device 5, by FP
The Nonlinear Dynamic output signal of laser 1 acquires and carries out autocorrelative calculating, according to the feelings of relevant peaks in autocorrelator trace
Condition, to judge the fault condition of optical-fiber network；
1.2) electric signal received is carried out autocorrelation calculation by signal acquisition and processing apparatus 5, and obtains autocorrelator trace；
1.3) after the completion of fault monitoring system is built, in the case where guaranteeing optical-fiber network normal communication, complete optical network system is carried out
Complete measurement, occur multiple relevant peaks on different location in addition to 0 point in the processing of autocorrelator trace, in each level-one branch
There is the correlation of cluster cluster due to the influence of VI different length of second level branch in second level branch VI under IV in autocorrelator trace
Peak value, every cluster correspond to each level-one branch, and each in cluster both corresponds to each second level branch；Pass through cutting
A certain level-one branch in curve so that complete the label to the corresponding respective cluster relevant peaks of each level-one branch；Cut off a certain branch
Second level branch completes calibration to optical network system second level branch relevant peaks, later can be into optical network system operational process
Row monitoring, in real time once tests the optical-fiber network and is compared with test result labeled for the first time, judge optical-fiber network
Operating condition；
2) after TWDM-PON second level optical network system brings into operation, constantly 1.2) being carried out with autocorrelator trace 1.3) pair
Than, according to difference the phenomenon that performance, judge the specific location of failure, specific as follows:
1. if the relevant peaks of all branches all become very little or disappear simultaneously in the autocorrelator trace for the FP laser 1 that test obtains
And a relevant peaks are had more before the first cluster relevant peaks, show that the failure hinders the communication of entire optical-fiber network, then failure occurs
In feeder fiber II, such as the failure 1 and Fig. 4 in Fig. 2, corresponding fault point can be in light as a reflection unit, FP laser 1
Under the action of feedback, occurs a new peak value in autocorrelator trace, which corresponds to abort situation；
2. if in the autocorrelator trace of FP laser 1 that test obtains only wherein the relevant peaks of cluster branch become very little or
It disappears, and has more a relevant peaks in other positions, show only one level-one branch Communication Block at this time, then occur in level-one
Branch optical fibers IV, as the failure 2 and Fig. 5 in Fig. 2 other positions can then occur since there are light feedbacks in autocorrelator trace
One new reflection peak, the reflection peak correspond to abort situation；
3. if a labeled relevant peaks in the autocorrelator trace of FP laser 1 that test obtains wherein in cluster become very
Small or disappear, there is not new peak value in other positions, then failure occurs in second level branch VI, as in Fig. 2 failure 3 and
Fig. 6 then other positions a new reflection peak can occur in autocorrelator trace, the reflection peak is corresponding since there are light feedbacks
In abort situation；
4. if wherein the relevant peaks of more cluster branches become very little or disappearance, and there are many places respective counts before the first cluster relevant peaks
The relevant peaks of amount, then failure occurs in more level-one branches IV, as shown in fig. 7, at this time then need to be in the level-one branch of each label
In IV, checked one by one according to the position for having more relevant peaks；
5. failure occurs multiple under a level-one branch IV if multiple correlation peaks only in same cluster are varied
Second level branch VI, as shown in figure 8, need to be checked one by one in the branch of each label according to the position for having more relevant peaks at this time；
6. multiple second levels under different level-one branches IV occur for failure if multiple relevant peaks under different clusters are varied
Branch VI, as shown in figure 9, at this time in the branch of the label according to corresponding to relevant peaks, according to having more the position of relevant peaks one by one
Investigation.
Embodiment two
A kind of high-precision fault monitoring device towards TWDM-PON includes TWDM-PON optical network system and light as shown in Figure 1:
Network monitoring system；The TWDM-PON optical network system includes that optical transmitter and receiver OLT I, feeder fiber II, the first order 1 divide the battle array on the road n
Train wave guide grating AWG III, level-one branch IV, the second level 1 divide the array waveguide grating AWG V, second level branch VI and optical-fiber network on the road n
Unit VII, connection of the optical transmitter and receiver OLT I by feeder fiber II and the array waveguide grating AWG III on 1 point of road n, 1 point of n
The n drop two port of the array waveguide grating AWG III on road divides the Waveguide array on the road n by n root level-one branch IV and the n second level 1
Grating AWG V connects one to one；Each second level 1 divides the n drop two port of the array waveguide grating AWG V on the road n to pass through n root two
Grade branch VI and the input terminal of n optical network unit VII connect one to one；The optical-fiber network monitoring system includes FP laser
1, coupler 2, optically coupled device 3, photodetector 4, signal acquisition and processing apparatus 5 and light feedback device 6；The FP laser
1 connect with coupler 2；The large scale output end of the coupler 2 is connect with the input terminal of optically coupled device 3, coupler 2 it is small
Ratio output end is connect with the input terminal of photodetector 4；The optically coupled device 3 is installed on feeder fiber II；Photoelectricity is visited
The output end for surveying device 4 is connect with the input terminal of signal acquisition and processing apparatus 5；FP laser 1, coupler 2, optically coupled device 3, light
Electric explorer 4, signal acquisition and processing apparatus 5 are respectively positioned on I side optical transmitter and receiver OLT；Installation is corresponded on every second level branch VI
There is a light feedback device 6, and each smooth feedback device 6 is located at corresponding VII side of optical network unit；Each smooth feedback device 6 can
Reflection is all different from passable wavelength and corresponding with corresponding branch, and is totally reflected the detection signal of the branch, full by
The signal of communication of the branch；The distance of each 6 distance FP laser 1 of smooth feedback device is different, the minimal difference of distance
Greater than detection accuracy, guarantee that the correlation curve of every cluster will not be all overlapped, each in every cluster is not also overlapped.
In the present embodiment: the wave-length coverage of the FP laser 1 is 1600nm-1700nm, output power 1mW-1W；Institute
Stating coupler 2 is the photo-coupler that coupling ratio is 80:20 ~ 99:1, and the photo-coupler of 99:1 is selected in the present embodiment；The optocoupler
Attach together set 3 be, the photo-coupler that coupling ratio is 50:50；The photodetector 4 be 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 5 is by bandwidth less than 50GHz's
One-channel signal acquisition device with can carry out the digital correlator of autocorrelation calculation or computer connects composition；The smooth feedback device
6 be the reflective fiber grating that wave-length coverage is 1600nm-1700nm.
A kind of high-precision fault monitoring method towards TWDM-PON, implements, including walk as follows in the present embodiment
It is rapid:
1) after the completion of TWDM-PON optical network system and optical-fiber network monitoring system are laid with, start to carry out following steps:
1.1) laser of FP laser 1 transmitting and signal of communication different wave length, i.e. signal of communication wavelength and detection signal wavelength are not
It is the same band；The laser emitted passes through coupler 2, and large scale output end passes through laser signal through optically coupled device 3
It is coupled into feeder fiber II, and the array waveguide grating AWG III through 1 point of road n is divided into n root level-one branch IV, n root level-one branch IV
Light one-to-one correspondence is conveyed into the array waveguide grating AWG V for dividing the road n in the second level 1, the Waveguide array on the road n is divided in each second level 1
The drop two port of grating AWG V will detect light and enter one-to-one n light feedback device 6, light feedback via n root second level branch VI
The detection light backtracking that device 6 reflects disturbs FP laser 1, the work for feeding back FP laser 1 in light to FP laser 1
With lower generation chaos, the wavelength and communication wavelengths of reflected light at this time are not a wave bands；The small scale output end of coupler will
Light inputs photodetector 4, and converts optical signals to electric signal, later electric signal input signal acquisition processing device 5, by FP
The Nonlinear Dynamic output signal of laser 1 acquires and carries out autocorrelative calculating, according to the feelings of relevant peaks in autocorrelator trace
Condition, to judge the fault condition of optical-fiber network；
1.2) electric signal received is carried out autocorrelation calculation by signal acquisition and processing apparatus 5, and obtains autocorrelator trace；
1.3) after the completion of fault monitoring system is built, in the case where guaranteeing optical-fiber network normal communication, complete optical network system is carried out
Complete measurement, occur multiple relevant peaks on different location in addition to 0 point in the processing of autocorrelator trace, in each level-one branch
There is the correlation of cluster cluster due to the influence of VI different length of second level branch in second level branch VI under IV in autocorrelator trace
Peak value, every cluster correspond to each level-one branch, and each in cluster both corresponds to each second level branch；Pass through cutting
A certain level-one branch in curve so that complete the label to the corresponding respective cluster relevant peaks of each level-one branch；Cut off a certain branch
Second level branch completes calibration to optical network system second level branch relevant peaks, later can be into optical network system operational process
Row monitoring, in real time once tests the optical-fiber network and is compared with test result labeled for the first time, judge optical-fiber network
Operating condition；
2) after TWDM-PON second level optical network system brings into operation, constantly 1.2) being carried out with autocorrelator trace 1.3) pair
Than, it is different the phenomenon that performance according to abort situation difference, specific as follows:
1. if the relevant peaks of all branches all become very little or disappear simultaneously in the autocorrelator trace for the FP laser 1 that test obtains
And a relevant peaks are had more before the first cluster relevant peaks, show that the failure hinders the communication of entire optical-fiber network, then failure occurs
In feeder fiber II, such as the failure 1 and Fig. 4 in Fig. 2, corresponding fault point can be in light as a reflection unit, FP laser 1
Under the action of feedback, occurs a new peak value in autocorrelator trace, which corresponds to abort situation；
2. if in the autocorrelator trace of FP laser 1 that test obtains only wherein the relevant peaks of cluster branch become very little or
It disappears, and has more a relevant peaks in other positions, show only one level-one branch Communication Block at this time, then occur in level-one
Branch optical fibers IV, as the failure 2 and Fig. 5 in Fig. 2 other positions can then occur since there are light feedbacks in autocorrelator trace
One new reflection peak, the reflection peak correspond to abort situation；
3. if a labeled relevant peaks in the autocorrelator trace of FP laser 1 that test obtains wherein in cluster become very
Small or disappear, there is not new peak value in other positions, then failure occurs in second level branch VI, as in Fig. 2 failure 3 and
Fig. 6 then other positions a new reflection peak can occur in autocorrelator trace, the reflection peak is corresponding since there are light feedbacks
In abort situation；
4. if wherein the relevant peaks of more cluster branches become very little or disappearance, and there are many places respective counts before the first cluster relevant peaks
The relevant peaks of amount, then failure occurs in more level-one branches IV, as shown in fig. 7, at this time then need to be in the level-one branch of each label
In IV, checked one by one according to the position for having more relevant peaks；
5. failure occurs multiple under a level-one branch IV if multiple correlation peaks only in same cluster are varied
Second level branch VI, as shown in figure 8, need to be checked one by one in the branch of each label according to the position for having more relevant peaks at this time；
6. multiple second levels under different level-one branches IV occur for failure if multiple relevant peaks under different clusters are varied
Branch VI, as shown in figure 9, at this time in the branch of the label according to corresponding to relevant peaks, according to having more the position of relevant peaks one by one
Investigation.
Embodiment three
A kind of high-precision fault monitoring device towards TWDM-PON includes TWDM-PON optical network system and light as shown in Figure 1:
Network monitoring system；The TWDM-PON optical network system includes that optical transmitter and receiver OLT I, feeder fiber II, the first order 1 divide the battle array on the road n
Train wave guide grating AWG III, level-one branch IV, the second level 1 divide the array waveguide grating AWG V, second level branch VI and optical-fiber network on the road n
Unit VII, connection of the optical transmitter and receiver OLT I by feeder fiber II and the array waveguide grating AWG III on 1 point of road n, 1 point of n
The n drop two port of the array waveguide grating AWG III on road divides the Waveguide array on the road n by n root level-one branch IV and the n second level 1
Grating AWG V connects one to one；Each second level 1 divides the n drop two port of the array waveguide grating AWG V on the road n to pass through n root two
Grade branch VI and the input terminal of n optical network unit VII connect one to one；The optical-fiber network monitoring system includes FP laser
1, coupler 2, optically coupled device 3, photodetector 4, signal acquisition and processing apparatus 5 and light feedback device 6；The FP laser
1 connect with coupler 2；The large scale output end of the coupler 2 is connect with the input terminal of optically coupled device 3, coupler 2 it is small
Ratio output end is connect with the input terminal of photodetector 4；The optically coupled device 3 is installed on feeder fiber II；Photoelectricity is visited
The output end for surveying device 4 is connect with the input terminal of signal acquisition and processing apparatus 5；FP laser 1, coupler 2, optically coupled device 3, light
Electric explorer 4, signal acquisition and processing apparatus 5 are respectively positioned on I side optical transmitter and receiver OLT；Installation is corresponded on every second level branch VI
There is a light feedback device 6, and each smooth feedback device 6 is located at corresponding VII side of optical network unit；Each smooth feedback device 6 can
Reflection is all different from passable wavelength and corresponding with corresponding branch, and is totally reflected the detection signal of the branch, full by
The signal of communication of the branch；The distance of each 6 distance FP laser 1 of smooth feedback device is different, the minimal difference of distance
Greater than detection accuracy, guarantee that the correlation curve of every cluster will not be all overlapped, each in every cluster is not also overlapped.
In the present embodiment: the wave-length coverage of the FP laser 1 is 1600nm-1700nm, output power 1mW-1W；Institute
Stating coupler 2 is the photo-coupler that coupling ratio is 80:20 ~ 99:1, and the photo-coupler of 80:20 is selected in the present embodiment；The light
The photo-coupler that coupling device 3 is wavelength division multiplexer or coupling ratio is 50:50；The photodetector 4 is can response wave length model
It encloses for 1600nm-1700nm and bandwidth is less than the high-speed photodetector of 50GHz；The signal acquisition and processing apparatus 5 is by bandwidth
One-channel signal acquisition device less than 50GHz with can carry out the digital correlator of autocorrelation calculation or computer connects composition；Institute
State light feedback device 6 be plated on the branch optical fibers IV being connect with optical network unit distal end faces and can reflected wavelength range be
The high-reflecting film of 1600nm-1700nm.
A kind of high-precision fault monitoring method towards TWDM-PON, implements, including walk as follows in the present embodiment
It is rapid:
1) after the completion of TWDM-PON optical network system and optical-fiber network monitoring system are laid with, start to carry out following steps:
1.1) laser of FP laser 1 transmitting and signal of communication different wave length, i.e. signal of communication wavelength and detection signal wavelength are not
It is the same band；The laser emitted passes through coupler 2, and large scale output end passes through laser signal through optically coupled device 3
It is coupled into feeder fiber II, and the array waveguide grating AWG III through 1 point of road n is divided into n root level-one branch IV, n root level-one branch IV
Light one-to-one correspondence is conveyed into the array waveguide grating AWG V for dividing the road n in the second level 1, the Waveguide array on the road n is divided in each second level 1
The drop two port of grating AWG V will detect light and enter one-to-one n light feedback device 6, light feedback via n root second level branch VI
The detection light backtracking that device 6 reflects disturbs FP laser 1, the work for feeding back FP laser 1 in light to FP laser 1
With lower generation chaos, the wavelength and communication wavelengths of reflected light at this time are not a wave bands；The small scale output end of coupler will
Light inputs photodetector 4, and converts optical signals to electric signal, later electric signal input signal acquisition processing device 5, by FP
The Nonlinear Dynamic output signal of laser 1 acquires and carries out autocorrelative calculating, according to the feelings of relevant peaks in autocorrelator trace
Condition, to judge the fault condition of optical-fiber network；
1.2) electric signal received is carried out autocorrelation calculation by signal acquisition and processing apparatus 5, and obtains autocorrelator trace；
1.3) after the completion of fault monitoring system is built, in the case where guaranteeing optical-fiber network normal communication, complete optical network system is carried out
Complete measurement, occur multiple relevant peaks on different location in addition to 0 point in the processing of autocorrelator trace, in each level-one branch
There is the correlation of cluster cluster due to the influence of VI different length of second level branch in second level branch VI under IV in autocorrelator trace
Peak value, every cluster correspond to each level-one branch, and each in cluster both corresponds to each second level branch；Pass through cutting
A certain level-one branch in curve so that complete the label to the corresponding respective cluster relevant peaks of each level-one branch；Cut off a certain branch
Second level branch completes calibration to optical network system second level branch relevant peaks, later can be into optical network system operational process
Row monitoring, in real time once tests the optical-fiber network and is compared with test result labeled for the first time, judge optical-fiber network
Operating condition；
2) after TWDM-PON second level optical network system brings into operation, constantly 1.2) being carried out with autocorrelator trace 1.3) pair
Than, it is different the phenomenon that performance according to abort situation difference, specific as follows:
1. if the relevant peaks of all branches all become very little or disappear simultaneously in the autocorrelator trace for the FP laser 1 that test obtains
And a relevant peaks are had more before the first cluster relevant peaks, show that the failure hinders the communication of entire optical-fiber network, then failure occurs
In feeder fiber II, such as the failure 1 and Fig. 4 in Fig. 2, corresponding fault point can be in light as a reflection unit, FP laser 1
Under the action of feedback, occurs a new peak value in autocorrelator trace, which corresponds to abort situation；
2. if in the autocorrelator trace of FP laser 1 that test obtains only wherein the relevant peaks of cluster branch become very little or
It disappears, and has more a relevant peaks in other positions, show only one level-one branch Communication Block at this time, then occur in level-one
Branch optical fibers IV, as the failure 2 and Fig. 5 in Fig. 2 other positions can then occur since there are light feedbacks in autocorrelator trace
One new reflection peak, the reflection peak correspond to abort situation；
3. if a labeled relevant peaks in the autocorrelator trace of FP laser 1 that test obtains wherein in cluster become very
Small or disappear, there is not new peak value in other positions, then failure occurs in second level branch VI, as in Fig. 2 failure 3 and
Fig. 6 then other positions a new reflection peak can occur in autocorrelator trace, the reflection peak is corresponding since there are light feedbacks
In abort situation；
4. if wherein the relevant peaks of more cluster branches become very little or disappearance, and there are many places respective counts before the first cluster relevant peaks
The relevant peaks of amount, then failure occurs in more level-one branches IV, as shown in fig. 7, at this time then need to be in the level-one branch of each label
In IV, checked one by one according to the position for having more relevant peaks；
5. failure occurs multiple under a level-one branch IV if multiple correlation peaks only in same cluster are varied
Second level branch VI, as shown in figure 8, need to be checked one by one in the branch of each label according to the position for having more relevant peaks at this time；
6. multiple second levels under different level-one branches IV occur for failure if multiple relevant peaks under different clusters are varied
Branch VI, as shown in figure 9, at this time in the branch of the label according to corresponding to relevant peaks, according to having more the position of relevant peaks one by one
Investigation.
The scope of protection of present invention is not limited to the above specific embodiment, and for those skilled in the art and
Speech, the present invention can there are many deformation and change, it is all within design and principle of the invention it is made it is any modification, improve and
Equivalent replacement should be all included within protection scope of the present invention.
Claims (6)
1. a kind of high-precision fault monitoring device towards TWDM-PON, it is characterised in that: including TWDM-PON optical network system
System is monitored with optical-fiber network；
The TWDM-PON optical network system includes that optical transmitter and receiver OLT I, feeder fiber II, the first order 1 divide the Waveguide array light on the road n
Grid AWG III, level-one branch IV, the second level 1 divide the array waveguide grating AWG V, second level branch VI and optical network unit VII on the road n,
Connection of the optical transmitter and receiver OLT I by feeder fiber II and the array waveguide grating AWG III on 1 point of road n, the battle array on 1 point of road n
The n drop two port of train wave guide grating AWG III divides the array waveguide grating AWG on the road n by n root level-one branch IV and the n second level 1
V connects one to one；Each second level 1 divides the n drop two port of the array waveguide grating AWG V on the road n to pass through n root second level branch
VI connects one to one with the input terminal of n optical network unit VII；
Optical-fiber network monitoring system include FP laser (1), coupler (2), optically coupled device (3), photodetector (4),
Signal acquisition and processing apparatus (5) and light feedback device (6)；The FP laser (1) connect with coupler (2)；The coupler
(2) large scale output end is connect with the input terminal of optically coupled device (3), and the small scale output end and photoelectricity of coupler (2) are visited
Survey the input terminal connection of device (4)；The optically coupled device (3) is installed on feeder fiber II；The output end of photodetector (4)
It is connect with the input terminal of signal acquisition and processing apparatus (5)；FP laser (1), coupler (2), optically coupled device (3), photoelectricity are visited
Survey device (4), signal acquisition and processing apparatus (5) is respectively positioned on I side optical transmitter and receiver OLT；Installation is corresponded on every second level branch VI
There is a light feedback device (6), and each smooth feedback device (6) is located at corresponding VII side of optical network unit；Each light feedback dress
Detection letters all different from passable wavelength and corresponding with corresponding branch, and being totally reflected the branch can be reflected by setting (6)
Number, full by the signal of communication of the branch；The distance of each smooth feedback device (6) distance FP laser (1) is different, away from
From minimal difference be greater than detection accuracy, guarantee that the correlation curve of every cluster will not be all overlapped, each in every cluster is not yet
Overlapping.
2. a kind of high-precision fault monitoring device towards TWDM-PON according to claim 1, it is characterised in that: described
The wave-length coverage of FP laser (1) is 1600nm-1700nm, output power 1mW-1W；The coupler (2) is for coupling ratio
The photo-coupler of 80:20 ~ 99:1；The photo-coupler that the optically coupled device (3) is wavelength division multiplexer or coupling ratio is 50:50；
The photodetector (4) be can response wave length scope be 1600nm-1700nm and bandwidth less than 50GHz high speed optoelectronic detect
Device；The signal acquisition and processing apparatus (5) is less than the one-channel signal acquisition device of 50GHz by bandwidth and can carry out autocorrelation calculation
Digital correlator or computer connection composition.
3. a kind of high-precision fault monitoring device towards TWDM-PON according to claim 1 or 2, it is characterised in that:
The smooth feedback device (6) by wavelength division multiplexer with can reflected wavelength range be 1600nm-1700nm fiber reflector connect
Composition, and the wavelength of signal of communication is not influenced, to detection signal total reflection.
4. a kind of high-precision fault monitoring device towards TWDM-PON according to claim 1 or 2, it is characterised in that:
The smooth feedback device (6) is the reflective fiber grating that wave-length coverage is 1600nm-1700nm.
5. a kind of high-precision fault monitoring device towards TWDM-PON according to claim 1 or 2, it is characterised in that:
The smooth feedback device (6) be plated on the branch optical fibers IV being connect with optical network unit distal end faces and can reflected wavelength range
For the high-reflecting film of 1600nm-1700nm.
6. a kind of high-precision fault monitoring method towards TWDM-PON, this method it is as described in claim 1 it is a kind of towards
It is realized in the high-precision fault monitoring device of TWDM-PON, characterized by the following steps:
1) after the completion of TWDM-PON optical network system and optical-fiber network monitoring system are laid with, start to carry out following steps:
1.1) laser of FP laser (1) transmitting and signal of communication different wave length, i.e. signal of communication wavelength and detection signal wavelength
It is not the same band；The laser emitted passes through coupler (2), and large scale output end is by laser signal by attaching together through optocoupler
It sets (3) and is coupled into feeder fiber II, and the array waveguide grating AWG III through 1 point of road n is divided into n root level-one branch IV, n root level-one
Light one-to-one correspondence is conveyed into the array waveguide grating AWG V for dividing the road n in the second level 1 by branch IV, and the battle array on the road n is divided in each second level 1
The drop two port of train wave guide grating AWG V will detect light and enter one-to-one n light feedback device via n root second level branch VI
(6), the detection light backtracking of light feedback device (6) reflection disturbs FP laser (1), makes FP laser to FP laser (1)
Device (1) generates chaos under the action of light is fed back, and the wavelength and communication wavelengths of reflected light at this time are not a wave bands；Coupler
(2) light is inputted photodetector (4) by small scale output end, and converts optical signals to electric signal, and electric signal inputs later
The Nonlinear Dynamic output signal of FP laser (1) is acquired and is carried out autocorrelative calculating by signal acquisition and processing apparatus (5),
According in autocorrelator trace the case where relevant peaks, to judge the fault condition of optical-fiber network；
1.2) electric signal received is carried out autocorrelation calculation by signal acquisition and processing apparatus (5), and obtains autocorrelator trace；
1.3) after the completion of fault monitoring system is built, in the case where guaranteeing optical-fiber network normal communication, complete optical network system is carried out
Complete measurement, occur multiple relevant peaks on different location in addition to 0 point in the processing of autocorrelator trace, in each level-one branch
There is the correlation of cluster cluster due to the influence of VI different length of second level branch in second level branch VI under IV in autocorrelator trace
Peak value, every cluster correspond to each level-one branch, and each in cluster both corresponds to each second level branch；Pass through cutting
A certain level-one branch in curve so that complete the label to the corresponding respective cluster relevant peaks of each level-one branch；Cut off a certain branch
Second level branch completes calibration to optical network system second level branch relevant peaks, later can be into optical network system operational process
Row monitoring, in real time once tests the optical-fiber network and is compared with test result labeled for the first time, judge optical-fiber network
Operating condition；
2) after TWDM-PON second level optical network system brings into operation, constantly 1.2) being carried out with autocorrelator trace 1.3) pair
Than, according to difference the phenomenon that performance, judge the specific location of failure, specific as follows:
1. if the relevant peaks of all branches all become very little or disappearance in the autocorrelator trace for the FP laser (1) that test obtains
And a relevant peaks are had more before the first cluster relevant peaks, show that the failure hinders the communication of entire optical-fiber network, then failure is sent out
It gives birth in feeder fiber II, as a reflection unit, FP laser (1) is understood under the action of light feedback for corresponding fault point,
Occurs a new peak value in autocorrelator trace, which corresponds to abort situation；
2. if in the autocorrelator trace of FP laser (1) that test obtains only wherein the relevant peaks of cluster branch become very little or
Person disappears, and has more a relevant peaks in other positions, shows only one level-one branch Communication Block at this time, then occurs one
Grade branch optical fibers IV then other positions a new reflection peak can occur in autocorrelator trace, this is anti-since there are light feedbacks
The position for penetrating peak corresponds to abort situation；
3. if a labeled relevant peaks in the autocorrelator trace of FP laser (1) that test obtains wherein in cluster become
There is not new peak value in very little or disappearance, other positions, then failure occurs in second level branch VI, due to there are light feedback,
Then other positions a new reflection peak can occur in autocorrelator trace, which corresponds to abort situation；
4. if wherein the relevant peaks of more cluster branches become very little or disappearance, and there are many places respective counts before the first cluster relevant peaks
The relevant peaks of amount, then failure occurs in more level-one branches IV, at this time then need to be in the level-one branch IV of each label, according to more
The position of relevant peaks is checked one by one out；
5. failure occurs multiple under a level-one branch IV if multiple correlation peaks only in same cluster are varied
Second level branch VI need to be checked one by one in the branch of each label according to the position for having more relevant peaks at this time；
6. multiple second levels under different level-one branches IV occur for failure if multiple relevant peaks under different clusters are varied
Branch VI at this time in the branch of the label according to corresponding to relevant peaks, is checked one by one according to the position for having more relevant peaks.
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