CN104202084A - Device and method for monitoring failures of time division multiplexing optical network link - Google Patents
Device and method for monitoring failures of time division multiplexing optical network link Download PDFInfo
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- CN104202084A CN104202084A CN201410515353.5A CN201410515353A CN104202084A CN 104202084 A CN104202084 A CN 104202084A CN 201410515353 A CN201410515353 A CN 201410515353A CN 104202084 A CN104202084 A CN 104202084A
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Abstract
The invention relates to an optical fiber communication network failure monitoring technology, in particular to a device and a method for monitoring failures of a time division multiplexing optical network link, and solves the problems that the present time division multiplexing passive optical network failure monitoring technology is low in spatial resolution, complicated in structure, low in sensitivity and small in dynamic range. The device comprises a time division multiplexing optical network and a monitoring device, wherein the time division multiplexing optical network comprises an optical line terminal, a feeder fiber, an n-branch optical splitter, n branch fibers and n optical network units; the monitoring device comprises an isolator-free semiconductor laser, a coupler, an optical coupling device, a photoelectric detector, a signal acquisition and treatment device and n optical feedback devices. The semiconductor laser is connected with the coupler, and the large-scale output terminal of the coupler is connected with the input terminal of the optical coupling device. The device is suitable for monitoring failures of a time division multiplexing passive optical network.
Description
Technical field
The present invention relates to Networks of Fiber Communications malfunction monitoring technology, specifically a kind of device and method of monitoring TDM optical network link failure.
Background technology
At present, Networks of Fiber Communications develops to Drop cable Access Network rapidly from intercity arterial grid.In various Drop cable Access Networks, wavelength division multiplexing (WDM, Wavelength Division Multiplexing) and time division multiplexing (TDM, Time Division Multiplexing) EPON (PON, Passive Optical Network) that combines of technology be realize at a high speed, the best access scheme of high capacity communication.Therefore, diagnose out the fault of EPON significant to ensureing communication and digital service timely and accurately.Optical time domain reflectometer (OTDR, Optical Time Domain Reflectometry) is main tool and the means of monitoring at present fiber failure.But it is no longer suitable for the malfunction monitoring of PON.Main cause is as follows:
1. in structure, in PON, each user terminal is optical network unit (ONU, Optical Network Unit) respectively on independent branch road, they are connected and communicate by letter with the optical transmitter and receiver (OLT, Optical Line Terminal) of holding in control centre by multiplexer and a feeder line optical fiber.Therefore, practical malfunction monitoring need to be implemented in control centre, the failure condition of the each user's branch road of remote measurement.And traditional OTDR adopts the simple venation of fixed wave length to wash off as detectable signal, each branch road of None-identified, does not therefore have this function;
2. traditional OTDR adopts simple venation to wash off as detectable signal, the contradiction of Existential Space resolution and dynamic range in principle: it needs enough wide light pulse to ensure echo power, but wider pulse duration has reduced spatial resolution.It is 10ns-1 μ s that typical case surveys pulsewidth, and corresponding spatial resolution is 1-100 rice.Obviously, this spatial resolution cannot meet the malfunction monitoring requirement of PON.
So high-precision passive optical network fault monitoring technology becomes Networks of Fiber Communications malfunction monitoring field and needs the problem that solves and receive much concern badly.
At present, make important progress for the malfunction monitoring of Wave division multiplexing passive optical network (WDM-PON).In WDM-PON, each branch road is undertaken multiplexing by wavelength, therefore can utilize wavelength to identify each branch road.The tunable OTDR technology of multi-wavelength is proposed in succession.For example, Kwanil Lee and Ju Han Lee etc. utilize spontaneous emission noise to realize monitoring (IEEE Photonics Technology Letters, Vol.18, the No.3 of fault and the decay event of WDM-PON in conjunction with OTDR technology, pp. 523-525,2006; Journal of Lightwave Technology, Vol. 25, No. 10, pp. 2891-2897,2007); Madhan Thollabandi etc. utilizes tunable wave length OTDR to realize the monitoring (IEEE Photonics Technology Letters, Vol. 20, No. 15, pp. 1323-1325,2008) of Wave division multiplexing passive optical network link failure; Wang Anbang etc. utilize chaotic dependence Detection Techniques (ZL 200810054534.7) to realize detected with high accuracy (the Journal of Lightwave Technology of Wave division multiplexing passive optical network link failure in conjunction with Wavelength tunable light source, Vol. 30, No. 21, pp. 3420-3426,2012).
But, solve not yet towards a high accuracy fault detect difficult problem for time division multiplexing EPON (TDM-PON).Because OLT in time division multiplexing EPON simultaneously sends to each ONU by power distribution unit by signal with the forms of broadcasting, cause there is no recognition feature (being similar to the channel wavelength in WDM-PON) between the downstream signal (OLT is to the signal transmission of ONU) of each branch road.At present, the method that researchers propose is that, in each branch road interpolation recognition feature, recycling conventional pulsed OTDR carries out malfunction monitoring.Several interpolation characterization method are as follows:
1. add the optical fiber of different length and coordinate reflection unit detection light to be returned to (as: Conference on Optical Fiber Communication at each branch road, Technical Digest Series, pp. 99-101,1997), come into operation and on monitoring curve, respective branch is carried out to mark early stage at network, regularly test afterwards and analytical test result, by that lack in curve and newly-increased fault peak, can determine branch road and the particular location of fault;
2. add optical filter (as: the IEEE Photonics Technology Letters of different wave length at each branch road, Vol. 8, No. 7, pp. 915-917,1996), can turn back to monitoring device and carry out branch road and determine surveying light, now OTDR selects wavelength adjustable light source to scan;
In each branch road with the installation composition such as wire jumper, filter code device (as: IEEE Communications Letters, Vol. 15, No. 9, pp. 1007-1009,2011), thereby then by the decoding device of monitoring side be decrypted determine fault branch.
Said method is the basis using pulse OTDR as test all, and in the 1st kind and the 3rd kind of method, each wire jumper minimal difference should be greater than the resolution of OTDR, be subject to optical fiber that the impact of long Distance Transmission adds to increase and increase progressively step by step with number of users, can cause thus great waste (taking 1km spatial resolution as example, user of every increase need to increase 1km by wire jumper on former basis).
Recently the chaotic laser light correlation method (as: ZL 200810054534.7) of report, although can realize the high accuracy fault-finding irrelevant with detection range, is only applicable to the fault measuring of simple optical fiber, is not useable in TDM-PON.In addition, the method needs comparatively complicated chaotic laser light generation device, as optical circulator, optical coupler, extra laser etc.Moreover the dynamic range of detection depends on the sensitivity that receives the photodetector of surveying light, the be generally-50dBm of photodetector sensitivity that prior art is made.
In sum, be necessary to invent a kind of brand-new high accuracy time division multiplexing passive optical network fault monitoring technology, to solve, existing time division multiplexing passive optical network fault monitoring technology spatial resolution is low, complex structure, sensitivity is low, dynamic range is little problem.
Summary of the invention
In order to solve, existing time division multiplexing passive optical network fault monitoring technology spatial resolution is low in the present invention, complex structure, sensitivity is low, dynamic range is little problem, and a kind of device and method of monitoring TDM optical network link failure is provided.
The present invention adopts following technical scheme to realize: a kind of device of monitoring TDM optical network link failure, comprises TDM optical network and monitoring device;
Described TDM optical network comprises optical splitter, n root branch road optical fiber, a n optical network unit (ONU, Optical Network Unit) on optical transmitter and receiver (OLT, Optical Line Terminal), feeder line optical fiber, 1 point of n road; Optical transmitter and receiver is connected with the common port of optical splitter by feeder line optical fiber; The n of optical splitter light splitting mouth connects one to one by the incident end face of n root branch road optical fiber and n optical network unit;
Described monitoring device comprises semiconductor laser (Semiconductor Laser), coupler, optically coupled device, photodetector, signal acquisition and processing apparatus, the n light feedback device without isolator; Semiconductor laser without isolator is connected with coupler; The vast scale output of coupler is connected with the input of optically coupled device, and the small scale output of coupler is connected with the input of photodetector; Optically coupled device is installed on feeder line optical fiber; The output of photodetector is connected with the input of signal acquisition and processing apparatus; Semiconductor laser, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus without isolator are all positioned at optical transmitter and receiver side; N light feedback device one by one correspondence is installed on n root branch road optical fiber, and n light feedback device is different apart from the distance of the semiconductor laser without isolator; N light feedback device one by one correspondence is positioned at n optical network unit side.
A kind of method (the method realizes in a kind of device of monitoring TDM optical network link failure of the present invention) of monitoring TDM optical network link failure, the method is to adopt following steps to realize:
1), after TDM optical network has been laid, start to carry out following steps:
1.1) without the semiconductor laser Emission Lasers of isolator; The laser of launching is divided into two-way through coupler: the first via is coupled into feeder line optical fiber through optically coupled device, and be divided into n root branch road optical fiber through optical splitter, then be back to the semiconductor laser without isolator through n the former road of light feedback device, make to produce Nonlinear Dynamic output without the semiconductor laser of isolator, Nonlinear Dynamic output transfers to photodetector through coupler, and transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication; The second tunnel transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication;
1.2) signal of telecommunication receiving is carried out autocorrelation calculation by signal acquisition and processing apparatus, and obtain autocorrelator trace;
1.3) now, have multiple relevant peaks in autocorrelator trace except zero point on diverse location, the relevant peaks of n is wherein corresponding one by one with n root branch road optical fiber;
1.4) disconnect one by one or remove the light feedback device on each road, and repeat step 1.1)-1.2); Now, the relevant peaks in autocorrelator trace weakens one by one or disappears, and marks accordingly step 1.3) the corresponding branch road optical fiber of each relevant peaks in gained correlation curve;
2), after TDM optical network brings into operation, constantly repeat step 1.1)-1.2), and by the autocorrelator trace and the step 1.3 that obtain at every turn) in autocorrelator trace contrast, now, if the n in autocorrelator trace relevant peaks weakens or disappears simultaneously, show that fault point is positioned on feeder line optical fiber, new one (being " feeder fault (the fault I) " shown in Fig. 4) or the multiple relevant peaks of occurring in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on feeder line optical fiber, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator, if the some relevant peaks in autocorrelator trace weaken or disappear, show fault point be positioned at the corresponding branch road optical fiber of this relevant peaks on, new one (being " branch trouble (the fault II) " shown in Fig. 4) or the multiple relevant peaks of occurring in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on this branch road, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator, if the p in autocorrelator trace (1 < p < n) relevant peaks weakens or disappears simultaneously, show fault point be positioned at this p the corresponding p root of relevant peaks branch road optical fiber on, multiple (>=p) the relevant peaks (being " the multiple branch circuit fault " shown in Fig. 4) of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the fault sum on fault branch, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator, now, need to be according to emerging correlation peak location, on p root branch road optical fiber, investigate one by one fault point.
The theoretical foundation of a kind of device and method of monitoring TDM optical network link failure of the present invention is as follows:
The laser signal that the present invention utilizes semiconductor laser to produce under the effect of light feedback exists this feature of time delay feature to realize the discriminating of optical-fiber network branch road and the location of fault.So-called time delay feature refers to that the Nonlinear Dynamic output that light feedback semiconductor laser produces can exist certain periodicity, returns to the experienced time and to be exactly semiconductor laser export feedback point to this cycle again.In the present invention, utilize the time delay feature of semiconductor laser under the reverberation effect of fault point, and the propagation velocity in optical fiber can record location of fault in conjunction with laser.It is to be noted, semiconductor laser can produce multiple Non-Linear Ocsillation (the Journal of Lightwave Technology such as monocycle, paracycle and chaos under the effect of varying strength (I to-90dB) feedback light, Vol. 4, No. 11, pp. 1655-1661,1986), but no matter there is time delay feature in the light intensity signal of which kind of vibration semiconductor laser output all the time.It should be noted that, this time delay feature is a kind of characteristic response (the IEEE Journal of Quantum Electronics of semiconductor laser to outside feedback light, Vol. 45, No. 7, pp. 879-891,2009), but be considered to limit light feedback semiconductor laser always and manage to be suppressed (IEEE Photonics Journal, Vol. 4, No. 5 at the adverse factor of the field application such as secure communication, pp. 1930-1935,2012).And the present invention makes full use of this delay character, detection fiber location of fault.In addition, the present invention arranges a feature feedback device at each branch road, for distinguishing concrete branch road.
The time delay feature of semiconductor laser under light feedback effect can be obtained by several different methods and (see: IEEE Journal of Quantum Electronics, Vol. 48, No. 11, pp. 1371-1379,2012), wherein the most exactly laser signal is carried out to auto-correlation computation, in the autocorrelator trace calculating, the time delay feature (as shown in Figure 4) of system has been reflected in the position of relevant peaks.By time delay with light the propagation velocity in optical fiber be combined and can calculate abort situation.Measure first determine the autocorrelator trace relevant peaks that tie point and feedback point are corresponding in whole optical-fiber network after (being " reference curve " shown in Fig. 4), in observation process afterwards, except curve is therewith in full accord, also there are following three kinds of situations in each monitoring result:
1. the relevant peaks that all branch roads are corresponding weakens or disappears, and occurs new relevant peaks, now illustrates that fault (being " feeder fault (the fault I) " shown in Fig. 4) has occurred feeder line;
2. only a relevant peaks corresponding to branch road weakens or disappears, and occurs new relevant peaks, now illustrates fault (being " branch trouble (the fault II) " shown in Fig. 4) has occurred on branch road corresponding to disappearance relevant peaks;
3. there is the relevant peaks that multiple branch roads are corresponding weaken or disappear, and occur the even more relevant peaks of equivalent amount, illustrate fault (being " the multiple branch circuit fault " shown in Fig. 4) has occurred on branch road corresponding to disappearance relevant peaks.
Compared with existing time division multiplexing passive optical network fault monitoring technology, a kind of device and method of monitoring TDM optical network link failure of the present invention has following features and advantage:
1. utilize the Nonlinear Dynamic that semiconductor laser produces to export the characteristic that has time delay feature, make whole EPON form the semiconductor laser non linear system of a multiple feedback;
2. using fault point as feedback point, by time delay feature interpretation position of failure point;
3. utilize the high bandwidth characteristic of Non-Linear Ocsillation, sharp-pointed self correlated peak, realized the high spatial resolution fault-finding irrelevant with detection range, detection accuracy can reach even submillimeter level of millimeter;
4. utilize at each branch road the feedback device of diverse location is set, carry out the discriminating of branch road by the difference of position, and due to the raising of precision, compare the wire jumper of the multiple grade length of introducing of km level wire jumper in OTDR method and greatly saved cost;
Laser be transmitter be also detector;
Laser to can reach-90dB of the response of feedback light, i.e. the detectivity of system, the sensitivity of comparing existing photodetector is greatly improved;
7. directly the output of laser is implemented to survey and carry out autocorrelation calculation, therefore the sensitivity of photodetector is without high request very, and detection and the processing comparing traditional correlation method and saved reference signal, simplifies the structure.
The present invention utilizes the Nonlinear Dynamic output that semiconductor laser produces under the effect of light feedback to have this feature of time delay feature, in conjunction with the high accuracy advantage of its correlation method, efficiently solve that existing time division multiplexing passive optical network fault monitoring technology spatial resolution is low, complex structure, sensitivity is low, dynamic range is little problem, be applicable to the monitoring of time division multiplexing passive optical network fault.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of device of monitoring TDM optical network link failure of the present invention.
Fig. 2 is the first structural representation of the light feedback device of a kind of device of monitoring TDM optical network link failure of the present invention.
Fig. 3 is the second structural representation of the light feedback device of a kind of device of monitoring TDM optical network link failure of the present invention.
Fig. 4 is the principle schematic of a kind of method of monitoring TDM optical network link failure of the present invention.
Embodiment
embodiment mono-
Monitor a device for TDM optical network link failure, comprise TDM optical network and monitoring device;
Described TDM optical network comprises optical splitter, n root branch road optical fiber, a n optical network unit on optical transmitter and receiver, feeder line optical fiber, 1 point of n road; Optical transmitter and receiver is connected with the common port of optical splitter by feeder line optical fiber; The n of optical splitter light splitting mouth connects one to one by the incident end face of n root branch road optical fiber and n optical network unit;
Described monitoring device comprises without the semiconductor laser of isolator, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus, a n light feedback device; Semiconductor laser without isolator is connected with coupler; The vast scale output of coupler is connected with the input of optically coupled device, and the small scale output of coupler is connected with the input of photodetector; Optically coupled device is installed on feeder line optical fiber; The output of photodetector is connected with the input of signal acquisition and processing apparatus; Semiconductor laser, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus without isolator are all positioned at optical transmitter and receiver side; N light feedback device one by one correspondence is installed on n root branch road optical fiber, and n light feedback device is different apart from the distance of the semiconductor laser without isolator; N light feedback device one by one correspondence is positioned at n optical network unit side.
When concrete enforcement, the wave-length coverage of the described semiconductor laser without isolator is 1600nm-1700nm, and power output is 1mW-1W; Described coupler is that coupling ratio is the optical coupler of 99:1; Described optically coupled device is the optical coupler that wavelength division multiplexer or coupling ratio are 50:50; Described photodetector is response wave length scope to be the high-speed photodetector that 1600nm-1700nm and bandwidth are less than 50GHz; Described signal acquisition and processing apparatus is less than 50GHz one-channel signal harvester by bandwidth connects to form with digital correlator or the computer that can carry out autocorrelation calculation.
In the present embodiment, described smooth feedback device is by wavelength division multiplexer and can reflected wavelength range be 1600nm-1700nm fiber reflector connects to form, as shown in Figure 2.
A kind of method (the method realizes in a kind of device of monitoring TDM optical network link failure of the present invention) of monitoring TDM optical network link failure, the method is to adopt following steps to realize:
1), after TDM optical network has been laid, start to carry out following steps:
1.1) without the semiconductor laser Emission Lasers of isolator; The laser of launching is divided into two-way through coupler: the first via is coupled into feeder line optical fiber through optically coupled device, and be divided into n root branch road optical fiber through optical splitter, then be back to the semiconductor laser without isolator through n the former road of light feedback device, make to produce Nonlinear Dynamic output without the semiconductor laser of isolator, Nonlinear Dynamic output transfers to photodetector through coupler, and transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication; The second tunnel transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication;
1.2) signal of telecommunication receiving is carried out autocorrelation calculation by signal acquisition and processing apparatus, and obtain autocorrelator trace;
1.3) now, have multiple relevant peaks in autocorrelator trace except zero point on diverse location, the relevant peaks of n is wherein corresponding one by one with n root branch road optical fiber;
1.4) disconnect one by one or remove the light feedback device on each road, and repeat step 1.1)-1.2); Now, the relevant peaks in autocorrelator trace weakens one by one or disappears, and marks accordingly step 1.3) the corresponding branch road optical fiber of each relevant peaks in gained correlation curve;
2), after TDM optical network brings into operation, constantly repeat step 1.1)-1.2), and by the autocorrelator trace and the step 1.3 that obtain at every turn) in autocorrelator trace contrast; Now, if the n in autocorrelator trace relevant peaks weakens or disappears simultaneously, show that fault point is positioned on feeder line optical fiber, the one or more relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on feeder line optical fiber, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator; If the some relevant peaks in autocorrelator trace weaken or disappear, show fault point be positioned at the corresponding branch road optical fiber of this relevant peaks on, the one or more relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on this branch road, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator; If the p in autocorrelator trace (1 < p < n) relevant peaks weakens or disappears simultaneously, show fault point be positioned at this p the corresponding p root of relevant peaks branch road optical fiber on, multiple (>=p) the relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the fault sum on fault branch, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator, now, need to, according to emerging correlation peak location, on p root branch road optical fiber, investigate one by one fault point.
embodiment bis-
Monitor a device for TDM optical network link failure, comprise TDM optical network and monitoring device;
Described TDM optical network comprises optical splitter, n root branch road optical fiber, a n optical network unit on optical transmitter and receiver, feeder line optical fiber, 1 point of n road; Optical transmitter and receiver is connected with the common port of optical splitter by feeder line optical fiber; The n of optical splitter light splitting mouth connects one to one by the incident end face of n root branch road optical fiber and n optical network unit;
Described monitoring device comprises without the semiconductor laser of isolator, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus, a n light feedback device; Semiconductor laser without isolator is connected with coupler; The vast scale output of coupler is connected with the input of optically coupled device, and the small scale output of coupler is connected with the input of photodetector; Optically coupled device is installed on feeder line optical fiber; The output of photodetector is connected with the input of signal acquisition and processing apparatus; Semiconductor laser, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus without isolator are all positioned at optical transmitter and receiver side; N light feedback device one by one correspondence is installed on n root branch road optical fiber, and n light feedback device is different apart from the distance of the semiconductor laser without isolator; N light feedback device one by one correspondence is positioned at n optical network unit side.
When concrete enforcement, the wave-length coverage of the described semiconductor laser without isolator is 1600nm-1700nm, and power output is 1mW-1W; Described coupler is that coupling ratio is the optical coupler of 99:1; Described optically coupled device is the optical coupler that wavelength division multiplexer or coupling ratio are 50:50; Described photodetector is response wave length scope to be the high-speed photodetector that 1600nm-1700nm and bandwidth are less than 50GHz; Described signal acquisition and processing apparatus is less than 50GHz one-channel signal harvester by bandwidth connects to form with digital correlator or the computer that can carry out autocorrelation calculation.
In the present embodiment, described smooth feedback device is that wave-length coverage is the reflection type optical fiber grating of 1600nm-1700nm, as shown in Figure 3.
A kind of method (the method realizes in a kind of device of monitoring TDM optical network link failure of the present invention) of monitoring TDM optical network link failure, the method is to adopt following steps to realize:
1), after TDM optical network has been laid, start to carry out following steps:
1.1) without the semiconductor laser Emission Lasers of isolator; The laser of launching is divided into two-way through coupler: the first via is coupled into feeder line optical fiber through optically coupled device, and be divided into n root branch road optical fiber through optical splitter, then be back to the semiconductor laser without isolator through n the former road of light feedback device, make to produce Nonlinear Dynamic output without the semiconductor laser of isolator, Nonlinear Dynamic output transfers to photodetector through coupler, and transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication; The second tunnel transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication;
1.2) signal of telecommunication receiving is carried out autocorrelation calculation by signal acquisition and processing apparatus, and obtain autocorrelator trace;
1.3) now, have multiple relevant peaks in autocorrelator trace except zero point on diverse location, the relevant peaks of n is wherein corresponding one by one with n root branch road optical fiber;
1.4) disconnect one by one or remove the light feedback device on each road, and repeat step 1.1)-1.2); Now, the relevant peaks in autocorrelator trace weakens one by one or disappears, and marks accordingly step 1.3) the corresponding branch road optical fiber of each relevant peaks in gained correlation curve;
2), after TDM optical network brings into operation, constantly repeat step 1.1)-1.2), and by the autocorrelator trace and the step 1.3 that obtain at every turn) in autocorrelator trace contrast; Now, if the n in autocorrelator trace relevant peaks weakens or disappears simultaneously, show that fault point is positioned on feeder line optical fiber, the one or more relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on feeder line optical fiber, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator; If the some relevant peaks in autocorrelator trace weaken or disappear, show fault point be positioned at the corresponding branch road optical fiber of this relevant peaks on, the one or more relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on this branch road, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator; If the p in autocorrelator trace (1 < p < n) relevant peaks weakens or disappears simultaneously, show fault point be positioned at this p the corresponding p root of relevant peaks branch road optical fiber on, multiple (>=p) the relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the fault sum on fault branch, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator, now, need to, according to emerging correlation peak location, on p root branch road optical fiber, investigate one by one fault point.
embodiment tri-
Monitor a device for TDM optical network link failure, comprise TDM optical network and monitoring device;
Described TDM optical network comprises optical splitter, n root branch road optical fiber, a n optical network unit on optical transmitter and receiver, feeder line optical fiber, 1 point of n road; Optical transmitter and receiver is connected with the common port of optical splitter by feeder line optical fiber; The n of optical splitter light splitting mouth connects one to one by the incident end face of n root branch road optical fiber and n optical network unit;
Described monitoring device comprises without the semiconductor laser of isolator, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus, a n light feedback device; Semiconductor laser without isolator is connected with coupler; The vast scale output of coupler is connected with the input of optically coupled device, and the small scale output of coupler is connected with the input of photodetector; Optically coupled device is installed on feeder line optical fiber; The output of photodetector is connected with the input of signal acquisition and processing apparatus; Semiconductor laser, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus without isolator are all positioned at optical transmitter and receiver side; N light feedback device one by one correspondence is installed on n root branch road optical fiber, and n light feedback device is different apart from the distance of the semiconductor laser without isolator; N light feedback device one by one correspondence is positioned at n optical network unit side.
When concrete enforcement, the wave-length coverage of the described semiconductor laser without isolator is 1600nm-1700nm, and power output is 1mW-1W; Described coupler is that coupling ratio is the optical coupler of 99:1; Described optically coupled device is the optical coupler that wavelength division multiplexer or coupling ratio are 50:50; Described photodetector is response wave length scope to be the high-speed photodetector that 1600nm-1700nm and bandwidth are less than 50GHz; Described signal acquisition and processing apparatus is less than 50GHz one-channel signal harvester by bandwidth connects to form with digital correlator or the computer that can carry out autocorrelation calculation.
In the present embodiment, described smooth feedback device be plated on the branch road optical fiber being connected with optical network unit distal end faces and can reflected wavelength range the high-reflecting film that is 1600nm-1700nm.
A kind of method (the method realizes in a kind of device of monitoring TDM optical network link failure of the present invention) of monitoring TDM optical network link failure, the method is to adopt following steps to realize:
1), after TDM optical network has been laid, start to carry out following steps:
1.1) without the semiconductor laser Emission Lasers of isolator; The laser of launching is divided into two-way through coupler: the first via is coupled into feeder line optical fiber through optically coupled device, and be divided into n root branch road optical fiber through optical splitter, then be back to the semiconductor laser without isolator through n the former road of light feedback device, make to produce Nonlinear Dynamic output without the semiconductor laser of isolator, Nonlinear Dynamic output transfers to photodetector through coupler, and transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication; The second tunnel transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication;
1.2) signal of telecommunication receiving is carried out autocorrelation calculation by signal acquisition and processing apparatus, and obtain autocorrelator trace;
1.3) now, have multiple relevant peaks in autocorrelator trace except zero point on diverse location, the relevant peaks of n is wherein corresponding one by one with n root branch road optical fiber;
1.4) disconnect one by one or remove the light feedback device on each road, and repeat step 1.1)-1.2); Now, the relevant peaks in autocorrelator trace weakens one by one or disappears, and marks accordingly step 1.3) the corresponding branch road optical fiber of each relevant peaks in gained correlation curve;
2), after TDM optical network brings into operation, constantly repeat step 1.1)-1.2), and by the autocorrelator trace and the step 1.3 that obtain at every turn) in autocorrelator trace contrast; Now, if the n in autocorrelator trace relevant peaks weakens or disappears simultaneously, show that fault point is positioned on feeder line optical fiber, the one or more relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on feeder line optical fiber, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator; If the some relevant peaks in autocorrelator trace weaken or disappear, show fault point be positioned at the corresponding branch road optical fiber of this relevant peaks on, the one or more relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on this branch road, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator; If the p in autocorrelator trace (1 < p < n) relevant peaks weakens or disappears simultaneously, show fault point be positioned at this p the corresponding p root of relevant peaks branch road optical fiber on, multiple (>=p) the relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the fault sum on fault branch, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator, now, need to, according to emerging correlation peak location, on p root branch road optical fiber, investigate one by one fault point.
embodiment tetra-
Monitor a device for TDM optical network link failure, comprise TDM optical network and monitoring device;
Described TDM optical network comprises optical splitter, n root branch road optical fiber, a n optical network unit on optical transmitter and receiver, feeder line optical fiber, 1 point of n road; Optical transmitter and receiver is connected with the common port of optical splitter by feeder line optical fiber; The n of optical splitter light splitting mouth connects one to one by the incident end face of n root branch road optical fiber and n optical network unit;
Described monitoring device comprises without the semiconductor laser of isolator, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus, a n light feedback device; Semiconductor laser without isolator is connected with coupler; The vast scale output of coupler is connected with the input of optically coupled device, and the small scale output of coupler is connected with the input of photodetector; Optically coupled device is installed on feeder line optical fiber; The output of photodetector is connected with the input of signal acquisition and processing apparatus; Semiconductor laser, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus without isolator are all positioned at optical transmitter and receiver side; N light feedback device one by one correspondence is installed on n root branch road optical fiber, and n light feedback device is different apart from the distance of the semiconductor laser without isolator; N light feedback device one by one correspondence is positioned at n optical network unit side.
When concrete enforcement, the wave-length coverage of the described semiconductor laser without isolator is 1600nm-1700nm, and power output is 1mW-1W; Described coupler is that coupling ratio is the optical coupler of 99:1; Described optically coupled device is the optical coupler that wavelength division multiplexer or coupling ratio are 50:50; Described photodetector is response wave length scope to be the high-speed photodetector that 1600nm-1700nm and bandwidth are less than 50GHz; Described signal acquisition and processing apparatus is less than 50GHz one-channel signal harvester by bandwidth connects to form with digital correlator or the computer that can carry out autocorrelation calculation.
In the present embodiment, described smooth feedback device be plated on optical network unit incident end face and can reflected wavelength range the high-reflecting film that is 1600nm-1700nm.
A kind of method (the method realizes in a kind of device of monitoring TDM optical network link failure of the present invention) of monitoring TDM optical network link failure, the method is to adopt following steps to realize:
1), after TDM optical network has been laid, start to carry out following steps:
1.1) without the semiconductor laser Emission Lasers of isolator; The laser of launching is divided into two-way through coupler: the first via is coupled into feeder line optical fiber through optically coupled device, and be divided into n root branch road optical fiber through optical splitter, then be back to the semiconductor laser without isolator through n the former road of light feedback device, make to produce Nonlinear Dynamic output without the semiconductor laser of isolator, Nonlinear Dynamic output transfers to photodetector through coupler, and transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication; The second tunnel transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication;
1.2) signal of telecommunication receiving is carried out autocorrelation calculation by signal acquisition and processing apparatus, and obtain autocorrelator trace;
1.3) now, have multiple relevant peaks in autocorrelator trace except zero point on diverse location, the relevant peaks of n is wherein corresponding one by one with n root branch road optical fiber;
1.4) disconnect one by one or remove the light feedback device on each road, and repeat step 1.1)-1.2); Now, the relevant peaks in autocorrelator trace weakens one by one or disappears, and marks accordingly step 1.3) the corresponding branch road optical fiber of each relevant peaks in gained correlation curve;
2), after TDM optical network brings into operation, constantly repeat step 1.1)-1.2), and by the autocorrelator trace and the step 1.3 that obtain at every turn) in autocorrelator trace contrast; Now, if the n in autocorrelator trace relevant peaks weakens or disappears simultaneously, show that fault point is positioned on feeder line optical fiber, the one or more relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on feeder line optical fiber, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator; If the some relevant peaks in autocorrelator trace weaken or disappear, show fault point be positioned at the corresponding branch road optical fiber of this relevant peaks on, the one or more relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on this branch road, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator; If the p in autocorrelator trace (1 < p < n) relevant peaks weakens or disappears simultaneously, show fault point be positioned at this p the corresponding p root of relevant peaks branch road optical fiber on, multiple (>=p) the relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the fault sum on fault branch, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator, now, need to, according to emerging correlation peak location, on p root branch road optical fiber, investigate one by one fault point.
Claims (7)
1. a device of monitoring TDM optical network link failure, is characterized in that: comprise TDM optical network and monitoring device;
Described TDM optical network comprises optical splitter, n root branch road optical fiber, a n optical network unit on optical transmitter and receiver, feeder line optical fiber, 1 point of n road; Optical transmitter and receiver is connected with the common port of optical splitter by feeder line optical fiber; The n of optical splitter light splitting mouth connects one to one by the incident end face of n root branch road optical fiber and n optical network unit;
Described monitoring device comprises without the semiconductor laser of isolator, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus, a n light feedback device; Semiconductor laser without isolator is connected with coupler; The vast scale output of coupler is connected with the input of optically coupled device, and the small scale output of coupler is connected with the input of photodetector; Optically coupled device is installed on feeder line optical fiber; The output of photodetector is connected with the input of signal acquisition and processing apparatus; Semiconductor laser, coupler, optically coupled device, photodetector, signal acquisition and processing apparatus without isolator are all positioned at optical transmitter and receiver side; N light feedback device one by one correspondence is installed on n root branch road optical fiber, and n light feedback device is different apart from the distance of the semiconductor laser without isolator; N light feedback device one by one correspondence is positioned at n optical network unit side.
2. a kind of device of monitoring TDM optical network link failure according to claim 1, is characterized in that: the wave-length coverage of the described semiconductor laser without isolator is 1600nm-1700nm, power output is 1mW-1W; Described coupler is that coupling ratio is the optical coupler of 99:1; Described optically coupled device is the optical coupler that wavelength division multiplexer or coupling ratio are 50:50; Described photodetector is response wave length scope to be the high-speed photodetector that 1600nm-1700nm and bandwidth are less than 50GHz; Described signal acquisition and processing apparatus is less than 50GHz one-channel signal harvester by bandwidth connects to form with digital correlator or the computer that can carry out autocorrelation calculation.
3. a kind of device of monitoring TDM optical network link failure according to claim 1 and 2, is characterized in that: described smooth feedback device is by wavelength division multiplexer and can reflected wavelength range be 1600nm-1700nm fiber reflector connects to form.
4. a kind of device of monitoring TDM optical network link failure according to claim 1 and 2, is characterized in that: described smooth feedback device is that wave-length coverage is the reflection type optical fiber grating of 1600nm-1700nm.
5. a kind of device of monitoring TDM optical network link failure according to claim 1 and 2, is characterized in that: described smooth feedback device be plated on the branch road optical fiber being connected with optical network unit distal end faces and can reflected wavelength range the high-reflecting film that is 1600nm-1700nm.
6. a kind of device of monitoring TDM optical network link failure according to claim 1 and 2, is characterized in that: described smooth feedback device be plated on optical network unit incident end face and can reflected wavelength range the high-reflecting film that is 1600nm-1700nm.
7. monitor a method for TDM optical network link failure, the method realizes in a kind of device of monitoring TDM optical network link failure as claimed in claim 1, it is characterized in that: the method is to adopt following steps to realize:
1), after TDM optical network has been laid, start to carry out following steps:
1.1) without the semiconductor laser Emission Lasers of isolator; The laser of launching is divided into two-way through coupler: the first via is coupled into feeder line optical fiber through optically coupled device, and be divided into n root branch road optical fiber through optical splitter, then be back to the semiconductor laser without isolator through n the former road of light feedback device, make to produce Nonlinear Dynamic output without the semiconductor laser of isolator, Nonlinear Dynamic output transfers to photodetector through coupler, and transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication; The second tunnel transfers to signal acquisition and processing apparatus after photodetector is converted to the signal of telecommunication;
1.2) signal of telecommunication receiving is carried out autocorrelation calculation by signal acquisition and processing apparatus, and obtain autocorrelator trace;
1.3) now, have multiple relevant peaks in autocorrelator trace except zero point on diverse location, the relevant peaks of n is wherein corresponding one by one with n root branch road optical fiber;
1.4) disconnect one by one or remove the light feedback device on each road, and repeat step 1.1)-1.2); Now, the relevant peaks in autocorrelator trace weakens one by one or disappears, and marks accordingly step 1.3) the corresponding branch road optical fiber of each relevant peaks in gained correlation curve;
2), after TDM optical network brings into operation, constantly repeat step 1.1)-1.2), and by the autocorrelator trace and the step 1.3 that obtain at every turn) in autocorrelator trace contrast; Now, if the n in autocorrelator trace relevant peaks weakens or disappears simultaneously, show that fault point is positioned on feeder line optical fiber, the one or more relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on feeder line optical fiber, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator; If the some relevant peaks in autocorrelator trace weaken or disappear, show fault point be positioned at the corresponding branch road optical fiber of this relevant peaks on, the one or more relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the number of faults on this branch road, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator; If the p in autocorrelator trace (1 < p < n) relevant peaks weakens or disappears simultaneously, show fault point be positioned at this p the corresponding p root of relevant peaks branch road optical fiber on, multiple (>=p) the relevant peaks of new appearance in other position simultaneously, emerging relevant peaks quantity correspondence the fault sum on fault branch, and fault point has been reflected in its position and without the distance between the semiconductor laser of isolator, now, need to, according to emerging correlation peak location, on p root branch road optical fiber, investigate one by one fault point.
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