CN104144014B - The methods, devices and systems of detection fiber fault - Google Patents
The methods, devices and systems of detection fiber fault Download PDFInfo
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- CN104144014B CN104144014B CN201310170753.2A CN201310170753A CN104144014B CN 104144014 B CN104144014 B CN 104144014B CN 201310170753 A CN201310170753 A CN 201310170753A CN 104144014 B CN104144014 B CN 104144014B
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Abstract
The present invention discloses the methods, devices and systems of a kind of detection fiber fault.Wherein in the method for detection fiber fault, when PON MAC module is after receiving the fiber failure detection request that Element management system sends, sends to OTDR module and start instruction information, the switching state of optical switch module is controlled；After OTDR module receives startup instruction information, send OTDR to optical switch module and detect signal；OTDR, according to the control of PON MAC module, is detected signal and is switched to corresponding optical fiber, and receive OTDR reflected signal from corresponding optical fiber, OTDR reflected signal is sent to OTDR module by optical switch module；OTDR module extracts OTDR sampled data from OTDR reflected signal, and by PON MAC module, OTDR sampled data is sent to Element management system.Owing to OTDR module and optical switch module are built in PON board, thus can ensure on the basis of OTDR test optical fiber performance, reduce diagnostic optical fiber cost, there is not optical module volume and the limited problem of power consumption simultaneously.
Description
Technical field
The present invention relates to Optical Access Network field, particularly to the side of a kind of detection fiber fault
Method, device and system.
Background technology
Diagnostic optical fiber technology is comprehensively to analyze PON(Passive Optical by testing and diagnosing server
Network, EPON) network management information or OTDR(Optical Time Domain
Reflectometer, optical time domain reflectometer) test information, optical fiber in long range positioning EPON,
The performance of optical device and fault, thus realize Centralized Monitoring and the fast failure location of fiber optic network,
Reduce unnecessary group single, save the input of human cost, improve operation management efficiency.
For Mu Qian, PON OTDR test optical fiber mainly has following several implementation:
1) independent shared formula OTDR and the shared OTDR of slot
Independent shared formula OTDR is also referred to as external OTDR, test wavelength typically use 1625nm or
Person 1650nm, OTDR equipment is arranged on local side machine room, is set by photoswitch and wavelength-division multiplex
Standby be connected to one or more OLT(Optical Line Terminal, optical line terminal) multiple
Under PON mouth, will test optically coupling on trunk optical fiber, meanwhile, operator can select user
The ONU(Optical Network Unit of side, optical network unit) the front reflective optical system that installs additional to be to strengthen
The end reflection of test light, it is achieved ODN(Optical Distribution Node under PON mouth,
Optical Distribution Node) optical link efficient diagnosis test, as shown in Figure 1.
Slot shared OTDR mode to realize principle the same with external OTDR, test gloss
With 1625nm or 1650nm wavelength, OTDR board is built in the slot of OLT framework,
Photoswitch and optical multiplexer part is external that OTDR module is connected to PON mouth, or at OTDR plate
It is integrated with in card and the module of OTDR function, many mouthfuls of photoswitches and optical multiplexer part etc. can be provided,
As in figure 2 it is shown, thus need not additionally increase independent OTDR equipment newly, simplify local side machine room
Networking structure, and just can realize OTDR and light by the management software of upgrading PON system
The interconnection of fine test diagnosis system.
Independent shared formula OTDR is the testing scheme of comparative maturity at present, can preferably test master
Dry and the reflection of branch optical fiber and decay events.The test effect of the shared OTDR of slot is with outer
Putting OTDR suitable, the most external OTDR is relatively low for cost, but does not has the skill of external OTDR
Art is ripe, and equipment needs the binding of OLT main equipment producer to provide.But in terms of networking structure, share
Formula OTDR(includes stand alone type and insertion slot type) scheme needs to increase multiple active and inactive component,
And need repeatedly to connect with jumping fiber so that local side networking is more complicated.Need in user side
Planning different length incoming fiber optic identifies different users, and design and construction difficulty increases, simultaneously
Construction cost increases.
2) the built-in OTDR of PON mouth
The built-in OTDR of PON mouth, i.e. OTDR function is integrated in the optical module of PON mouth, can
To each PON mouth connect ODN detect, test wavelength can use 1310nm,
1490nm or 1625/1650nm.Fig. 3 is as a example by 1650nm wavelength, and OTDR is integrated
In PON mouth optical module, optical module and PON MAC(Media Access Control, matchmaker
Body Access Control) module connects, thus this built-in original data of optical module that do not affect are transmitted.
The OTDR that built-in OTDR is relatively independent shared and slot is shared, further simplify
Networking structure, does not change the structure of ODN.But owing to luminous power is limited, disposal ability is limited,
Test performance is the most on the low side.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of method of detection fiber fault, device and
System.By OTDR module and optical switch module are built in PON board, can ensure
On the basis of OTDR test optical fiber performance, reduce diagnostic optical fiber cost, there is not optical module simultaneously
Volume and the limited problem of power consumption.
According to an aspect of the present invention, it is provided that a kind of method of detection fiber fault, including:
PON MAC module is receiving the fiber failure detection request that Element management system sends
After, send to OTDR module and start instruction information, the switching state of optical switch module is carried out
Control；
After OTDR module receives startup instruction information, send OTDR inspection to optical switch module
Survey signal；
OTDR, according to the control of PON MAC module, is detected signal switching by optical switch module
To corresponding optical fiber, and receive OTDR reflected signal from corresponding optical fiber；
OTDR reflected signal is sent to OTDR module by optical switch module；
OTDR module extracts OTDR sampled data from OTDR reflected signal, will
OTDR sampling data transmitting gives PON MAC module；
OTDR sampling data transmitting is given Element management system by PON MAC module.
According to a further aspect in the invention, it is provided that the board of a kind of detection fiber fault, including
PON MAC module, OTDR module and optical switch module, wherein:
PON MAC module, for receiving the fiber failure detection that Element management system sends
After request, send to OTDR module and start instruction information, the switching state to optical switch module
It is controlled；Receive the OTDR sampled data that OTDR module sends, by OTDR hits
According to being sent to Element management system；
OTDR module, for, after receiving startup instruction information, sending to optical switch module
OTDR detects signal；Receive the OTDR reflected signal that optical switch module sends, from OTDR
Reflected signal extracts OTDR sampled data, gives PON by OTDR sampling data transmitting
MAC module；
Optical switch module, for the control according to PON MAC module, by OTDR detection letter
Number it is switched to corresponding optical fiber, and receives OTDR reflected signal from corresponding optical fiber, will
OTDR reflected signal is sent to OTDR module.
According to a further aspect in the invention, it is provided that the system of a kind of detection fiber fault, including net
Unit's management system and PON board, wherein:
Element management system, for sending fiber failure detection request to PON board, receives
The OTDR sampled data that PON board sends, carries out diagnostic analysis to OTDR sampled data；
PON board, the board related to for any of the above-described embodiment.
The present invention is by receiving, when PON MAC module, the optical fiber that Element management system sends
After fault detect request, start OTDR module and send OTDR detection signal to optical switch module.
OTDR, according to the control of PON MAC module, is detected signal and is switched to phase by optical switch module
The optical fiber answered, and receive OTDR reflected signal from corresponding optical fiber.Optical switch module will
OTDR reflected signal is sent to OTDR module, and OTDR module is from OTDR reflected signal
Extract OTDR sampled data, give PON MAC module by OTDR sampling data transmitting.
OTDR sampling data transmitting is given Element management system by PON MAC module.Due to by OTDR
Module and optical switch module are built in PON board, thus can ensure OTDR test optical fiber
On the basis of performance, reduce diagnostic optical fiber cost, there is not optical module volume simultaneously and power consumption is limited
Problem.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it is clear that
Ground, the accompanying drawing in describing below is only some embodiments of the present invention, skill common for this area
From the point of view of art personnel, on the premise of not paying creative work, it is also possible to obtain according to these accompanying drawings
Obtain other accompanying drawing.
Fig. 1 is the structural representation of independent shared formula OTDR in prior art.
Fig. 2 is the structural representation of the shared OTDR of slot in prior art.
Fig. 3 is the structural representation of the built-in OTDR of optical module in prior art.
Fig. 4 is the schematic diagram of one embodiment of detection fiber fault method of the present invention.
Fig. 5 is the schematic diagram that the present invention sends OTDR detection one embodiment of signal.
Fig. 6 is the schematic diagram that the present invention sends one embodiment of OTDR sampled data.
Fig. 7 is the schematic diagram of one embodiment of PON board of the present invention.
Fig. 8 is the schematic diagram of one embodiment of OTDR module of the present invention.
Fig. 9 is the schematic diagram of one embodiment of detection fiber failure system of the present invention.
Figure 10 is the schematic diagram of one embodiment of Element management system of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical scheme in the embodiment of the present invention
It is clearly and completely described, it is clear that described embodiment is only that a part of the present invention is real
Execute example rather than whole embodiments.Description at least one exemplary embodiment is real below
It is merely illustrative on border, never as to the present invention and application thereof or any limit of use
System.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative labor
The every other embodiment obtained under dynamic premise, broadly falls into the scope of protection of the invention.
Unless specifically stated otherwise, the parts illustrated the most in these embodiments and the phase of step
Layout, numerical expression and numerical value are not limited the scope of the invention.
Simultaneously, it should be appreciated that for the ease of describing, the chi of the various piece shown in accompanying drawing
Very little is not to draw according to actual proportionate relationship.
May not make in detail for technology, method and apparatus known to person of ordinary skill in the relevant
Thin discussion, but in the appropriate case, described technology, method and apparatus should be considered to authorize to be said
A part for bright book.
Shown here with in all examples discussed, any occurrence should be construed as merely
Exemplary rather than conduct limits.Therefore, other example of exemplary embodiment can have
There is different values.
It should also be noted that similar label and letter expression similar terms in following accompanying drawing, therefore,
The most a certain Xiang Yi accompanying drawing is defined, then need not it is carried out in accompanying drawing subsequently
Discussed further.
Fig. 4 is the schematic diagram of one embodiment of detection fiber fault method of the present invention.Preferably,
The present embodiment is performed by PON board.
Step 401, PON MAC module is receiving the fiber failure that Element management system sends
After detection request, send to OTDR module and start instruction information, the switching to optical switch module
State is controlled.
Step 402, after OTDR module receives startup instruction information, sends to optical switch module
OTDR detects signal.
Step 403, OTDR, according to the control of PON MAC module, is examined by optical switch module
Survey signal and be switched to corresponding optical fiber, and receive OTDR reflected signal from corresponding optical fiber.
Step 404, OTDR reflected signal is sent to OTDR module by optical switch module.
Step 405, OTDR module extracts OTDR hits from OTDR reflected signal
According to, give PON MAC module by OTDR sampling data transmitting.
Step 406, OTDR sampling data transmitting is given Element management system by PON MAC module.
Method based on the detection fiber fault that the above embodiment of the present invention provides, works as PON
MAC module, after receiving the fiber failure detection request that Element management system sends, starts
OTDR module sends OTDR to optical switch module and detects signal.Optical switch module is according to PON
The control of MAC module, detects OTDR signal and is switched to corresponding optical fiber, and from described phase
The optical fiber answered receives OTDR reflected signal.OTDR reflected signal is sent to by optical switch module
OTDR module, OTDR module extracts OTDR sampled data from OTDR reflected signal,
PON MAC module is given by OTDR sampling data transmitting.PON MAC module is by OTDR
Sampling data transmitting gives Element management system.Due to by built-in to OTDR module and optical switch module
In PON board, thus light can be reduced on the basis of ensureing OTDR test optical fiber performance
, there is not optical module volume and the limited problem of power consumption in fine diagnosis cost simultaneously.
Fig. 5 is the schematic diagram that the present invention sends OTDR detection one embodiment of signal.At this
In embodiment, after above-mentioned OTDR module receives startup instruction information, send out to optical switch module
The step sending OTDR detection signal includes:
Step 501, the pulse signal generation module in OTDR module is receiving startup instruction letter
After breath, produce pulse signal.
Step 502, the test signal generator in OTDR module utilizes the driving of pulse signal,
Produce OTDR and detect signal.
Step 503, OTDR is detected signal by the test signal transmitting module in OTDR module
It is sent to optical switch module.
Fig. 6 is the schematic diagram that the present invention sends one embodiment of OTDR sampled data.At this
In embodiment, above-mentioned OTDR module extracts OTDR sampling from OTDR reflected signal
Data, include the step that OTDR sampling data transmitting gives PON MAC module:
Step 601, the receiver module in OTDR module when receiving OTDR reflected signal,
OTDR reflected signal is supplied to the message processing module in OTDR module.
Step 602, message processing module obtains OTDR hits from OTDR reflected signal
According to.
Step 603, the information transfer module in OTDR module is by OTDR sampling data transmitting
To PON MAC module.
Fig. 7 is the schematic diagram of one embodiment of PON board of the present invention.As described in Figure 7, plate
Card includes PON MAC module 701, OTDR module 702 and optical switch module 703.Wherein:
PON MAC module 701, for receiving the fiber failure that Element management system sends
After detection request, send to OTDR module 702 and start instruction information, to optical switch module 703
Switching state be controlled；Receive the OTDR sampled data that OTDR module 702 sends,
Element management system is given by OTDR sampling data transmitting.
OTDR module 702, for after receiving startup instruction information, to optical switch module 703
Send OTDR and detect signal；Receive the OTDR reflected signal that optical switch module 703 sends,
OTDR sampled data is extracted, by OTDR sampling data transmitting from OTDR reflected signal
To PON MAC module 701.
Optical switch module 703, for the control according to PON MAC module 701, by OTDR
Detection signal is switched to corresponding optical fiber, and receives OTDR reflection letter from corresponding optical fiber
Number, OTDR reflected signal is sent to OTDR module 702.
The board provided based on the above embodiment of the present invention, when PON MAC module is receiving
After the fiber failure detection request that Element management system sends, start OTDR module to photoswitch
Module sends OTDR and detects signal.Optical switch module according to the control of PON MAC module,
OTDR is detected signal and is switched to corresponding optical fiber, and receive OTDR from corresponding optical fiber
Reflected signal.OTDR reflected signal is sent to OTDR module, OTDR by optical switch module
Module extracts OTDR sampled data from OTDR reflected signal, by OTDR sampled data
It is sent to PON MAC module.OTDR sampling data transmitting is given net by PON MAC module
Unit's management system.Owing to OTDR module and optical switch module are built in PON board, from
And diagnostic optical fiber cost can be reduced on the basis of ensureing OTDR test optical fiber performance, simultaneously
There is not optical module volume and the limited problem of power consumption.
Preferably, photoswitch uses 1 × N photoswitch, if as a example by 4PON oralia card, then adopting
With 1 × 4 photoswitch, it is responsible for the switching of OTDR test signal route.
Fig. 8 is the schematic diagram of one embodiment of OTDR module of the present invention.As shown in Figure 8,
OTDR module includes pulse signal generation module 801, test signal generator 802 and test
Signal transmitting module 803.Wherein:
Pulse signal generation module 801, for, after receiving startup instruction information, producing pulse
Signal, utilizes pulse signal to drive test signal generator 802.
Test signal generator 802, for utilizing the driving of pulse signal to produce OTDR detection
Signal.
Test signal transmitting module 803, is sent to photoswitch mould for OTDR is detected signal
Block.
Preferably, test signal generator is laser instrument, utilizes the driving of pulse signal to produce and surveys
Trial signal, produced test signal wavelength is preferably 1650nm.
Preferably, OTDR module also includes receiver module 804, message processing module 805 and letter
Breath transfer module 806.Wherein:
Receiver module 804, for when receiving OTDR reflected signal, reflects OTDR
Signal is supplied to message processing module 805.
Message processing module 805, for obtaining OTDR hits from OTDR reflected signal
According to.
Information transfer module 806, for giving PON MAC mould by OTDR sampling data transmitting
Block.
Preferably, test signal transmitting module can be wave multiplexer or circulator, for by OTDR
Signal closes ripple with signal of communication.It is anti-that receiver module can receive OTDR by wave multiplexer or circulator
Penetrate signal.
Fig. 9 is the schematic diagram of one embodiment of detection fiber failure system of the present invention.Such as Fig. 9
Shown in, the system of detection fiber fault includes Element management system 901 and PON board 902.
Wherein:
Element management system 901, for sending fiber failure detection request to PON board 902,
Receive the OTDR sampled data that PON board 902 sends, OTDR sampled data is carried out
Diagnostic analysis.
PON board 902, the board related to for any embodiment in Fig. 7 or Fig. 8.
System based on the detection fiber fault that the above embodiment of the present invention provides, by inciting somebody to action
OTDR module and optical switch module are built in PON board, can ensure that OTDR optical fiber is surveyed
On the basis of examination performance, reduce diagnostic optical fiber cost, there is not optical module volume simultaneously and power consumption is subject to
The problem of limit.
For brevity, in the embodiment shown in fig. 9, a PON board is only gived.
It practice, Element management system can be the most mutual with multiple PON boards.
Figure 10 is the schematic diagram of one embodiment of Element management system of the present invention.As shown in Figure 10,
Element management system includes detecting request sending module 1001, detection data reception module 1002 and
Diagnostic analysis module 1003.Wherein:
Detection request sending module 1001, for sending fiber failure detection request to PON board.
Detection data reception module 1002, for receiving the OTDR sampling that PON board sends
Data.
Diagnostic analysis module 1003, for carrying out diagnostic analysis to OTDR sampled data.
Preferably, the information for diagnostic analysis includes the SFF(Small Form of optical module
Factor, small package technology)-8472 information, equipment on-line information, device looses power information, LOS
(Loss of Signal, dropout) information etc..Wherein, for EPON(Ethernet Passive
Optical Network, Ethernet passive optical network)/GPON(Gigabit-Capable PON,
Gigabit passive optical network) optical module be required to should based on SFF-8472 provide to self optical module
The isoparametric monitoring of operating temperature, supply voltage, bias current, transmitting optical power.
For hinge structure of the present invention, have the following advantages that and effect.
1) compared with OTDR measuring techniques for optical fiber shared with independence/slot:
Independence/slot shared OTDR diagnostic optical fiber technology, by stand alone type/insertion slot type OTDR,
Large Copacity photoswitch and wave multiplexer compound mode realize, and equipment cost is high, the connection between plurality of devices
Complexity, brings certain difficulty can to the layout of machine room, wiring.The shared OTDR of independence/slot
Measuring techniques for optical fiber cost is high, networking is complicated；And the application is ensureing OTDR test optical fiber performance
On the basis of, it is not necessary to newly-increased external device, and it is constant to keep original light path to connect, and is one side
Just the low-cost optical fiber diagnostic method disposed.
2) compared with OTDR measuring techniques for optical fiber built-in with optical module:
Optical module built-in OTDR diagnostic optical fiber technology, by the built-in OTDR of optical module and
The mode of composite wave appts realizes, and owing to optical module volume, power consumption are limited, therefore there is luminous power relatively
Little, test effect is poor and volume is hardly consistent with problems such as optical module standards, this technology also exists
In research, and the problem that this method, unglazed module volume and power consumption are limited, available existing core
Sheet and module, it is achieved simple.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment
Suddenly can be completed by hardware, it is also possible to instruct relevant hardware by program and complete, institute
The program stated can be stored in a kind of computer-readable recording medium, and storage mentioned above is situated between
Matter can be read only memory, disk or CD etc..
Description of the invention is given for the sake of example and description, and is not exhaustively
Or it limit the invention to disclosed form.Many modifications and variations are for the common skill of this area
It is obvious for art personnel.Selecting and describing embodiment is the principle in order to the present invention is more preferably described
Apply with reality, and make those of ordinary skill in the art it will be appreciated that the present invention thus design is suitable
The various embodiments with various amendments in special-purpose.
Claims (8)
1. the method for a detection fiber fault, it is characterised in that:
EPON medium education PON MAC module is receiving Element management system
After the fiber failure detection request sent, send to OTDR module and start instruction information, to light
The switching state of switch module is controlled；
After OTDR module receives startup instruction information, send OTDR inspection to optical switch module
Survey signal；
OTDR, according to the control of PON MAC module, is detected signal switching by optical switch module
To corresponding optical fiber, and receive OTDR reflected signal from corresponding optical fiber；
OTDR reflected signal is sent to OTDR module by optical switch module；
OTDR module extracts OTDR sampled data from OTDR reflected signal, will
OTDR sampling data transmitting gives PON MAC module；
OTDR sampling data transmitting is given Element management system by PON MAC module；
Wherein PON MAC module, OTDR module and optical switch module are arranged on PON board
In.
Method the most according to claim 1, it is characterised in that
After OTDR module receives startup instruction information, send OTDR inspection to optical switch module
The step surveying signal includes:
Pulse signal generation module in OTDR module, after receiving startup instruction information, produces
Pulse signal；
Test signal generator in OTDR module utilizes the driving of pulse signal, produces
OTDR detects signal；
OTDR is detected signal and is sent to light and opens by the test signal transmitting module in OTDR module
Close module.
Method the most according to claim 1 and 2, it is characterised in that
OTDR module extracts OTDR sampled data from OTDR reflected signal, will
OTDR sampling data transmitting is given the step of PON MAC module and is included:
Receiver module in OTDR module is when receiving OTDR reflected signal, by OTDR
Reflected signal is supplied to the message processing module in OTDR module；
Message processing module obtains OTDR sampled data from OTDR reflected signal；
OTDR sampling data transmitting is given PON by the information transfer module in OTDR module
MAC module.
4. the PON board of a detection fiber fault, it is characterised in that include EPON
Medium education PON MAC module, OTDR module and optical switch module, wherein:
PON MAC module, for receiving the fiber failure detection that Element management system sends
After request, send to OTDR module and start instruction information, the switching state to optical switch module
It is controlled；Receive the OTDR sampled data that OTDR module sends, by OTDR hits
According to being sent to Element management system；
OTDR module, for, after receiving startup instruction information, sending to optical switch module
OTDR detects signal；Receive the OTDR reflected signal that optical switch module sends, from OTDR
Reflected signal extracts OTDR sampled data, gives PON by OTDR sampling data transmitting
MAC module；
Optical switch module, for the control according to PON MAC module, by OTDR detection letter
Number it is switched to corresponding optical fiber, and receives OTDR reflected signal from corresponding optical fiber, will
OTDR reflected signal is sent to OTDR module.
PON board the most according to claim 4, it is characterised in that OTDR module bag
Include pulse signal generation module, test signal generator and test signal transmitting module, wherein:
Pulse signal generation module, for, after receiving startup instruction information, producing pulse signal,
Pulse signal is utilized to drive test signal generator；
Test signal generator, for utilizing the driving of pulse signal to produce OTDR detection letter
Number；
Test signal transmitting module, is sent to optical switch module for OTDR is detected signal.
6. according to the PON board described in claim 4 or 5, it is characterised in that OTDR mould
Block also includes receiver module, message processing module and information transfer module, wherein:
Receiver module, for when receiving OTDR reflected signal, by OTDR reflected signal
It is supplied to message processing module；
Message processing module, for obtaining OTDR sampled data from OTDR reflected signal；
Information transfer module, for giving PON MAC module by OTDR sampling data transmitting.
7. the system of a detection fiber fault, it is characterised in that include Element management system and
PON board, wherein:
Element management system, for sending fiber failure detection request to PON board, receives
The OTDR sampled data that PON board sends, carries out diagnostic analysis to OTDR sampled data；
PON board, the PON board related to any one of claim 4-6.
System the most according to claim 7, it is characterised in that Element management system includes
Detection request sending module, detection data reception module and diagnostic analysis module, wherein:
Detection request sending module, for sending fiber failure detection request to PON board；
Detection data reception module, for receiving the OTDR sampled data that PON board sends；
Diagnostic analysis module, for carrying out diagnostic analysis to OTDR sampled data.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104601228A (en) * | 2015-02-04 | 2015-05-06 | 苏州萤石光电科技有限公司 | System and method for positioning PON network optical fiber link failures |
| CN104639230A (en) * | 2015-03-20 | 2015-05-20 | 国家电网公司 | PON (passive optical network) maintenance method |
| US10567075B2 (en) * | 2015-05-07 | 2020-02-18 | Centre For Development Telematics | GIS based centralized fiber fault localization system |
| CN107063636A (en) * | 2017-05-19 | 2017-08-18 | 深圳市特发信息股份有限公司 | Optical cable detecting system |
| CN112702113A (en) * | 2019-10-23 | 2021-04-23 | 中兴通讯股份有限公司 | Optical network detection method, system, electronic device and computer readable medium |
| CN111211833B (en) * | 2020-01-15 | 2022-08-05 | 南京邮电大学 | Jumper connection resource rapid patrolling device and patrolling method based on optical switch |
| CN112713931B (en) * | 2021-01-27 | 2022-03-11 | 武汉光迅科技股份有限公司 | OTDR equipment, optical time domain reflection detection method and storage medium |
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| CN102571199A (en) * | 2011-12-31 | 2012-07-11 | 中兴通讯股份有限公司 | Optical fiber fault detection method and optical fiber fault detection device |
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| KR100687710B1 (en) * | 2004-11-20 | 2007-02-27 | 한국전자통신연구원 | Method and apparatus for monitering optical fiber of passive optical network system |
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| CN102177667A (en) * | 2008-10-09 | 2011-09-07 | 韩国科学技术院 | Fault localization method and fault localization device in a passive optical network, and passive optical network having the fault localization device |
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