CN104009796B - A kind of fiber fault of passive optical network detection method and system - Google Patents
A kind of fiber fault of passive optical network detection method and system Download PDFInfo
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- CN104009796B CN104009796B CN201310059072.9A CN201310059072A CN104009796B CN 104009796 B CN104009796 B CN 104009796B CN 201310059072 A CN201310059072 A CN 201310059072A CN 104009796 B CN104009796 B CN 104009796B
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Abstract
The invention discloses a kind of fiber fault of passive optical network detection method and system, methods described includes：Shunting coupler is set between optical splitter and trunk optical fiber, branch router is set between optical splitter and each branch optical fiber, multi-mode coupler is set between shunting coupler and branch router；The detection light that failure detector sends is transmitted to optical network unit via trunk optical fiber, shunting coupler, multi-mode coupler, branch router, branch optical fiber successively；The reflected light of the detection light is transmitted to failure detector via branch optical fiber, branch router, multi-mode coupler, shunting coupler, trunk optical fiber successively, so that the failure detector carries out fiber failure detection according to the reflected light for being detected.The present invention can be in all fiber failures in detection EPON at optical line terminal, the particularly failure of branch optical fiber.
Description
Technical field
The present invention relates to Optical Access Network field, more particularly to a kind of to trunk optical fiber in EPON and all of point
Propping up optical fiber carries out the system of method and its correlation of fault detect.
Background technology
With the requirement of the fast development and cost degradation and environmental protection of Fibre Optical Communication Technology, communication network is from core
Net, Metropolitan Area Network (MAN) to access network all have become basic Consensus using optical fiber network consisting.
For access network adopts EPON（Passive Optical Network, PON）Carry out light entering and copper back
Become the first-selection of operator.EPON is a kind of point-to-multipoint（Point to Multipoint, P2MP）Network, greatly
The laying of the PON of amount, its operation and safeguards the problem of operator's overriding concern of having become, in order to improve fault detection efficiency with
And reduce the cost, operator is in the urgent need in office side's optical line terminal（Optical Line Terminal, OLT）Can examine at place
Survey the technology and scheme of whole EPON.
Conventional optical time domain reflectometer（Optical Time Domain Reflectometer, OTDR）Fiber failure is examined
Survey method is to point-to-point（Point to Point, P2P) optical-fiber network be very effective, but it is transplanted to P2MP's directly
On EPON, some unprecedented difficulties are encountered, reason is optical distribution network（Optical Distribution
Network, ODN）In optical splitter be a high loss optical device, it just has 3 decibels of loss per point once light, for one
Individual 1:2NOptical splitter, its active loss is usually 3* (N+1) decibel or so, such as 1:32 optical splitter, its typical loss
At 17.5 decibels or so.And the light path detection method of OTDR is transmitting detection light, its reflected light is detected, the precision of its detection depends on
In its dynamic range, that is, the power for launching detection light deducts the power of the reflected light for detecting, and most of OTDR instrument are 40 to 45
Decibel, and the EPON to 20 kilometers, generally 8 decibels of its loss, and reflected light is generally spy to the maximum
The 4% of light-metering, i.e., 13 decibel, so for 1:The branch optical fiber that 32 EPON OTDR instrument at the OLT can be detected it is anti-
It is that the power for detecting light is deducted to penetrate luminous power（2*17.5+2*8+13）, i.e., up to 64 decibels, this is much for the dynamic range which needs
Beyond the certainty of measurement and scope of existing all OTDR instrument.In practice for 1:8 and the ODN EPONs of the above, its point
The fault-signal for propping up optical fiber can not have detected, it is common practice to which the optical mode of OTDR instrument or OLT at OLT is carried
The function of OTDR is detecting trunk optical fiber, as shown in figure 1, the detection light of OTDR is coupled into trunk optical fiber by WDM filter plates, and
Reflected light is entered on OTDR instrument along the direction contrary with detection light also by the light path, and the failure of branch optical fiber simply from
Detected with OTDR instrument family side.This just considerably increases operator's O＆M cost, how at the OLT detecting EPON
All fiber failures be solution that operator is dreamed of.
The content of the invention
Object of the present invention is to provide a kind of fiber fault of passive optical network detection method and system, preferably can solve
The all fiber failures of EPON, the particularly problem of branch optical fiber failure are detected at OLT certainly.
According to an aspect of the invention, there is provided a kind of fiber fault of passive optical network detection method, including：
Shunting coupler is set between optical splitter and trunk optical fiber, is arranged between optical splitter and each branch optical fiber and is divided
Road router, arranges multi-mode coupler between shunting coupler and branch router；
The detection light that failure detector sends is successively via trunk optical fiber, shunting coupler, multi-mode coupler, branch road
Transmitted to optical network unit by device, branch optical fiber；
The reflected light of the detection light successively via branch optical fiber, branch router, multi-mode coupler, shunting coupler,
Trunk optical fiber is transmitted to failure detector, so that the failure detector carries out optical fiber event according to the reflected light for being detected
Barrier detection.
Preferably, also include：
The downlink business light that optical line terminal sends is successively via trunk optical fiber, shunting coupler, optical splitter, branch route
Device, branch optical fiber are transmitted to optical network unit；
The uplink service light that optical network unit sends is successively via branch optical fiber, branch router, optical splitter, branch coupling
Device, trunk optical fiber are transmitted to optical line terminal.
Preferably, after shunting coupler receives the detection light and the downlink business light transmitted via trunk optical fiber,
The detection light is sent to into multi-mode coupler via its first interface, and the downlink business light is passed via its second interface
Deliver to optical splitter.
Preferably, shunting coupler receives the reflected light of the detection light via its first interface, via its second interface
After receiving the uplink service light, the reflected light of the detection light and the uplink service light are carried out into coupling processing, successively Jing
Sent to failure detector by its general-purpose interface and trunk optical fiber.
Preferably, multi-mode coupler is received after the detection light of shunting coupler transmission via its multimode fibre interface,
The detection light is respectively sent on each branch router via its multiple branch's single-mode interface.
Preferably, multi-mode coupler receives the inspection from each branch router respectively via its multiple branch's single-mode interface
After the reflected light of light-metering, the reflected light of the plurality of detection light is carried out into coupling processing, via its multimode fibre interface transmit to
Shunting coupler.
Preferably, the detection light for receiving and the downlink business light are carried out coupling processing by branch router, Jing its
General-purpose interface output is to branch optical fiber, and is sent to optical network unit.
Preferably, branch router receives the reflected light and the uplink service light of the detection light via its general-purpose interface
Afterwards, the reflected light of the detection light is sent to into multi-mode coupler via its first interface, and will be described via its second interface
Uplink service optical transport is to optical splitter.
Preferably, the failure detector is external or is integrated in optical line terminal, when outside the failure detector
When putting, wavelength-division multiplex filter plate is disposed on trunk optical fiber, and by described wavelength-division multiplex filter plate by the fault detect
The detection light that device sends is coupled in trunk optical fiber.
Preferably, the interface features of shunting coupler are corresponded with the interface features of branch router, in these modules
Comprising wavelength-division multiplex filter plate, actually same device can exchange.
Preferably, the failure detector is optical time domain reflectometer OTDR.
According to a further aspect in the invention, there is provided a kind of fiber fault of passive optical network detecting system, including：
The shunting coupler being arranged between the optical splitter and trunk optical fiber；
The branch router being arranged between the optical splitter and each branch optical fiber；
Multi-mode coupler between the shunting coupler and each branch router；
Failure detector, for sending detection light, make the detection light successively via trunk optical fiber, shunting coupler,
Multi-mode coupler, branch router, branch optical fiber are transmitted to optical network unit, and are received successively via branch optical fiber, branch road
By device, multi-mode coupler, shunting coupler, the detection light of trunk optical fiber transmission reflected light, so as to according to being detected
Reflected light carry out fiber failure detection.
Preferably, the failure detector is external or is integrated in optical line terminal, when outside the failure detector
When putting, wavelength-division multiplex filter plate is disposed on trunk optical fiber, and by described wavelength-division multiplex filter plate by the fault detect
The detection light that device sends is coupled in trunk optical fiber.
Preferably, the failure detector is optical time domain reflectometer OTDR.
Compared with prior art, the beneficial effects of the present invention is：
Present invention achieves detect at the OLT EPON including all fiber failures including branch optical fiber, energy
Operator maintenance cost is substantially reduced enough.
Description of the drawings
Fig. 1 is the structural representation of the EPON that fiber failure detection is carried out with OTDR that prior art is provided；
Fig. 2 is fiber fault of passive optical network detection method flow chart provided in an embodiment of the present invention；
Fig. 3 is fiber fault of passive optical network detecting system structural representation provided in an embodiment of the present invention；
Fig. 4 is the structural representation of multi-mode coupler provided in an embodiment of the present invention；
Fig. 5 is the structural representation of shunting coupler provided in an embodiment of the present invention；
Fig. 6 is the structural representation of branch router provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail, it will be appreciated that described below is excellent
Select embodiment to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Fig. 2 is fiber fault of passive optical network detection method flow chart provided in an embodiment of the present invention, as shown in Fig. 2 step
Suddenly include：
Step 201, shunting coupler is set between optical splitter and trunk optical fiber, optical splitter and each branch optical fiber it
Between arrange branch router, between shunting coupler and branch router, multi-mode coupler is set.
The detection light that step 202, failure detector send is successively via trunk optical fiber, shunting coupler, Multiple modes coupling
Device, branch router, branch optical fiber are transmitted to optical network unit.
Further, in the step 202, the downlink business light that optical line terminal sends successively via trunk optical fiber,
Shunting coupler, optical splitter, branch router, branch optical fiber are transmitted to optical network unit.
Step 203, the reflected light of the detection light are successively via branch optical fiber, branch router, multi-mode coupler, branch
Coupler, trunk optical fiber are transmitted to failure detector, so that the failure detector enters according to the reflected light for being detected
Row fiber failure is detected.
Further, in the step 203, the uplink service light that optical network unit sends successively via branch optical fiber,
Branch router, optical splitter, shunting coupler, trunk optical fiber are transmitted to optical line terminal.
Specifically, for descending, shunting coupler receive the detection light transmitted via trunk optical fiber and it is described under
After industry business light, the detection light is sent to into multi-mode coupler via its first interface, and will be described via its second interface
Downlink business light transmission is to optical splitter.Multi-mode coupler is being received described in shunting coupler reflection via its multimode fibre interface
After detection light, each branch being respectively sent to the detection light via its multiple branch's single-mode interface on branch optical fiber route
Device.Branch router receives detection light derived from the multi-mode coupler via its first interface, receives via its second interface
After downlink business light derived from the optical splitter, the detection light and the downlink business light are carried out into coupling processing, along branch
Optical Fiber Transmission is to ONU.
Specifically, for up, branch router via its general-purpose interface receive the uplink service light that ONU sends with
And after the reflected light of the detection light on each branch optical fiber, via its first interface by the reflected light back to Multiple modes coupling
Device, and via its second interface by the uplink service light transmission to optical splitter.Multi-mode coupler is via its multiple branch's list
Mould interface is received after the reflected light of the detection light of each branch router respectively, and the reflected light of the plurality of detection light is entered
Row coupling processing, transmits to shunting coupler via its multimode fibre interface.Shunting coupler receives institute via its first interface
Reflected light derived from multi-mode coupler is stated, is received after uplink service light derived from the optical splitter via its second interface, by institute
Stating reflected light and the uplink service light carries out coupling processing, sends to fault detect along trunk optical fiber via its general-purpose interface and fills
Put.The failure detector determines optical fiber whether failure by the luminous intensity of reflected light, and when it is determined that optical fiber has failure,
According to light transmission time, fiber failure position is determined.
In above-mentioned steps, the failure detector it is external or it is integrated in the olt, when the failure detector it is external
When, WDM is set on trunk optical fiber, and the detection light that the failure detector sends is coupled into by set WDM
Trunk optical fiber.
Described failure detector is OTDR.
Fig. 3 is fiber fault of passive optical network detecting system structural representation provided in an embodiment of the present invention, such as Fig. 3 institutes
Show, the present invention carries out one to ODN in order to the failure of all optical fiber particularly branch optical fiber in EPON is detected at OLT
It is a little to transform, i.e., before and after the optical splitter of ODN and bypass increases some passive light guide modules.Specifically, first optical splitter with
Increased a light guide module, i.e. shunting coupler between trunk optical fiber, its effect be required light is carried out branch and
Coupling；Next increases a light guide module, i.e. branch router, its Main Function between optical splitter and each branch optical fiber
And branch and coupling are carried out to the light into branch optical fiber；It is last to connect one between shunting coupler and branch router
The module of mode coupler, i.e. multi-mode coupler, its Main Function build a branch bypass by optical splitter so that have
The light of needs can bypass the optical splitter of high loss, and walk low-loss multi-mode coupler.
In the present embodiment, the failure detector is OTDR instrument, is arranged on outside OLT.
The basic functional principle and workflow of the system is as follows：
First, the detection light Jing trunk optical fiber for sending from the downlink business light of OLT and from OTDR instrument is reached and is located at
After the shunting coupler of ODN, downlink business light is directed to optical splitter, and the detection light of OTDR is directed to the multimode of multi-mode coupler
Optical fiber interface；Downlink business light reaches each branch router after going out optical splitter, and the detection light Jing multi-mode coupler of OTDR
Branch's single-mode interface reaches each branch router；Then by each branch router the downlink business light and the detection
The corresponding branch optical fiber of guiding is optically coupled together, is arrived on corresponding ONU through the transmission of branch optical fiber.
And the reflected light of the uplink service light that sends from ONU and the detection light on each branch optical fiber is along branch optical fiber
After reaching branch router, uplink service light is directed to optical splitter, goes out optical splitter and enters shunting coupler；And reflected light is directed to
Branch's single-mode interface of multi-mode coupler, Jing after multi-mode coupler coupling goes out its multimode fibre interface and reaches shunting coupler；Institute
State uplink service light and the reflected light and trunk optical fiber is oriented to together Jing after shunting coupler coupling, Jing after trunk optical fiber transmission
WDM is reached, then up light is directed to OLT, and the reflected light for detecting is directed on OTDR instrument.
If the optical module of OLT has the function of OTDR, then all of up light（That is uplink service light and reflected light）
Jing optical modules are directly reached on OLT, directly these light are processed using the OTDR functions in OLT.
In order to realize that the function of the above, shunting coupler and branch router select WDM, the benefit of this scheme
It is that up-downgoing business light walks original light path, and detection light and its reflected light is except branch optical fiber and original light path of trunk optical fiber
Outward, bypass the bypass that optical splitter walks multi-mode coupler, this will greatly reduce the loss of its light path, the detection light of branch optical fiber and
Its reflected light greatly reduces its optical path loss due to having bypassed optical splitter so that the OTDR instrument that it can be arrived at OLT
On, reach the hope of operator's detection branches fiber failure at the OLT.
The present invention increased several light guide modules at the optical splitter of the ODN in original EPON, i.e., positioned at master
Shunting coupler between dry optical fiber and optical splitter, the branch router-module between optical splitter and each branch optical fiber lead to
Cross the multi-mode coupler that shunting coupler and branch router link together, the i.e. first interface of shunting coupler and multimode coupling
The multimode fibre interface of clutch is connected, and the first interface of branch router is connected with branch's single-mode interface of multi-mode coupler.
Each light guide module is described separately to accompanying drawing 6 below in conjunction with accompanying drawing 4.
Fig. 4 is the structural representation of multi-mode coupler provided in an embodiment of the present invention, as shown in figure 4, multi-mode coupler is
It is made up of mode coupler, its one end is multimode passage or multimode fibre, and the other end is multiple single mode passages or multiple lists
Mode fiber, it is middle to pass through lens or coupling channel is coupled them, in the present embodiment, using its single mode passage to many
The light path of mould passage, according to the loss of the light path only one of which decibel of the prior art direction, therefore meet the direction bypass be
Low-loss demand, and while using the light path of its multimode passage to single mode passage, according to the light path of the prior art direction with
The loss of optical splitter is identical.
Fig. 5 is the structural representation of shunting coupler provided in an embodiment of the present invention, as shown in figure 5, shunting coupler bag
WDM is included, this is the filter plate of three interfaces, it is by edge film filtering slice（Edge TFF）Composition, its separation wavelength
1620nm is scheduled on, if 1620nm is less than by the wavelength of light, by which as the transmission interface P of second interface and general
Interface C is passed in and out, and the wavelength for passing through light is when being more than 1620nm, by which is as reflective interface R of first interface and general connects
Mouth C turnover.The general-purpose interface C is connected with trunk optical fiber, and its transmission interface P is connected with the general-purpose interface of optical splitter, its reflection
Interface R is connected with the multimode fibre interface of multi-mode coupler.
The shunting coupler also includes the lens being located between general-purpose interface C and WDM, due to the light of multimode fibre
Spot needs the reflection luminous energy come in from the reflective interface R overwhelming majority is imported trunk optical fiber using the lens than larger, this
Adjust particularly significant, the total losses that it will determine that up light detours.A lens have been selected in the shunting coupler of the present embodiment,
When implementing, it would however also be possible to employ two or more lens groups are adjusted.Meanwhile, for realizing the optics of the regulatory function
Device is not limited to the coupling channel of the lens in the present embodiment, or coupled apparatus composition.
Fig. 6 is the structural representation of branch router provided in an embodiment of the present invention, as shown in fig. 6, branch router bag
WDM is included, this is the wavelength-division multiplex filter plate of three interfaces, and it is made up of Edge TFF, and its separation wavelength is scheduled on
1620nm, if by the wavelength of light be less than 1620nm, by its as second interface transmission interface P and general-purpose interface
C is passed in and out, and when passing through the wavelength of light more than 1620nm, is entered by its reflective interface R and general-purpose interface C as first interface
Go out.Its general-purpose interface C is connected with branch optical fiber, its transmission interface P be connected with the stub interface of optical splitter, its reflective interface R and
Branch's single-mode interface of multi-mode coupler is connected.
Although shunting coupler and branch router use same WDM filter plates, the optical fiber of their coupling and
Coupled modes are somewhat different, therefore can not be general between them.
Below in conjunction with each light guide module described in accompanying drawing 4 to accompanying drawing 6, the work to system provided in an embodiment of the present invention
Flow process carries out as described below：
Trunk optical fiber is coupled into from the detection light Jing WDM of OTDR first, Jing is transferred to up to the branch coupling positioned at ODN
The general-purpose interface of clutch, goes out shunting coupler reflective interface R into the multimode fibre interface of multi-mode coupler, goes out multi-mode coupler
Branch's single-mode interface after reach reflective interface R of each branch router, the general-purpose interface for going out each branch router is entered
Corresponding branch optical fiber, most after Jing branch optical fibers reach on each ONU.
The reflected light of detection light along returning on OTDR instrument with detection light identical light path, but contrary transmission direction,
Specifically, the traveling process of the reflected light of the light path detection of the branch optical fiber is that the reflected light of branch optical fiber is by each branch
Optical fiber enters the general-purpose interface C of its corresponding branch router, enters coupled multichannel from branch router reflective interface R
Branch's single-mode interface of coupler, enters from the multimode fibre interface of multiple-path coupler Jing after multiple-path coupler coupling and is connected thereto
Shunting coupler reflective interface R, then enter trunk optical fiber from the general-purpose interface C of shunting coupler, after transmission, reach WDM filters
Ripple mouth, is directed on OTDR instrument, if OLT has the optical module of built-in OTDR, then will be transmitted directly on OLT.
And the general-purpose interface C of the shunting coupler positioned at ODN is reached from the downlink business light Jing trunk optical fibers of OLT,
The general-purpose interface of optical splitter is entered from transmission interface P, then is derived from optical splitter to the transmission interface P of each branch router, gone out
General-purpose interface enter corresponding branch optical fiber, most after Jing branch optical fibers reach on each ONU.
The uplink service light sent from ONU reaches branch router general-purpose interface along branch optical fiber, from branch router
Transmission interface P is derived, and into the stub interface of optical splitter, then derive from the general-purpose interface of optical splitter, into shunting coupler
Transmission interface P, finally derives from the general-purpose interface of shunting coupler and enters trunk optical fiber, reach WDM Jing after trunk optical fiber transmission
On filtering mouth, then uplink service light is directed to OLT.
If the optical module of OLT has the function of OTDR, then all of up light（Uplink service light and reflected light）Jing
Optical module is directly reached on OLT, directly these light is processed using the OTDR functions of OLT.
Of the invention maximum the characteristics of is that up-downgoing business light still walks original light path, no to change, and the light path of OTDR
Detection light and its reflected light bypass optical splitter, which greatly enhances accuracy of detection and the sensitivity of OTDR so as to branch
The precision of the fault detect of optical fiber substantially increases its signal to noise ratio such as the precision of the detection failure to trunk optical fiber, such as right
In 1:32 ODN networks, its signal to noise ratio will improve at least 15 decibels, and this will meet light of the operator to the EPON of P2MP
The demand of fine fault detect.
Although being described in detail to the present invention above, the invention is not restricted to this, those skilled in the art of the present technique
Various modifications can be carried out with principle of the invention.Therefore, all modifications made according to the principle of the invention, all should be understood to
Fall into protection scope of the present invention.
Claims (9)
1. a kind of fiber fault of passive optical network detection method, it is characterised in that include：
Shunting coupler is set between optical splitter and trunk optical fiber, branch road is set between optical splitter and each branch optical fiber
By device, multi-mode coupler is set between shunting coupler and branch router；
The detection light that failure detector sends is successively via trunk optical fiber, shunting coupler, multi-mode coupler, branch route
Device, branch optical fiber are transmitted to optical network unit；
The reflected light of the detection light is successively via branch optical fiber, branch router, multi-mode coupler, shunting coupler, trunk
Optical Fiber Transmission to failure detector, so that the failure detector carries out fiber failure inspection according to the reflected light for being detected
Survey；
The downlink business light that optical line terminal sends successively via trunk optical fiber, shunting coupler, optical splitter, branch router,
Branch optical fiber is transmitted to optical network unit；
The uplink service light that optical network unit sends successively via branch optical fiber, branch router, optical splitter, shunting coupler,
Trunk optical fiber is transmitted to optical line terminal.
2. method according to claim 1, it is characterised in that shunting coupler is received via described in trunk optical fiber transmission
After detection light and the downlink business light, the detection light is sent to into multi-mode coupler via its first interface, and via which
The downlink business light is sent to optical splitter by second interface.
3. method according to claim 2, it is characterised in that shunting coupler receives the detection via its first interface
The reflected light of light, receives after the uplink service light via its second interface, by the reflected light of the detection light and described up
Business light carries out coupling processing, sends to failure detector via its general-purpose interface and trunk optical fiber successively.
4. method according to claim 1, it is characterised in that multi-mode coupler receives branch via its multimode fibre interface
After the detection light of coupler transmission, the detection light is respectively sent to into each branch via its multiple branch's single-mode interface
On router.
5. method according to claim 4, it is characterised in that multi-mode coupler is via its multiple branch's single-mode interfaces difference
Receive after the reflected light of the detection light of each branch router, the reflected light of the plurality of detection light is carried out at coupling
Reason, transmits to shunting coupler via its multimode fibre interface.
6. method according to claim 1, it is characterised in that branch router by the detection light for receiving and it is described under
Industry business light carries out coupling processing, and Jing its general-purpose interface output is to branch optical fiber, and is sent to optical network unit.
7. method according to claim 6, it is characterised in that branch router receives the detection via its general-purpose interface
After the reflected light of light and the uplink service light, the reflected light of the detection light is sent to into Multiple modes coupling via its first interface
Device, and via its second interface by the uplink service optical transport to optical splitter.
8. the method according to claim 1-7 any one, it is characterised in that the failure detector is external or integrated
In optical line terminal, when the failure detector is external, wavelength-division multiplex filter plate is disposed on trunk optical fiber, and is passed through
Described wavelength-division multiplex filter plate is coupled into the detection light that the failure detector sends in trunk optical fiber.
9. a kind of fiber fault of passive optical network detecting system, it is characterised in that include：
The shunting coupler being arranged between optical splitter and trunk optical fiber；
The branch router being arranged between the optical splitter and each branch optical fiber；
Multi-mode coupler between the shunting coupler and each branch router；
Failure detector, for sending detection light, makes the detection light successively via trunk optical fiber, shunting coupler, multimode
Coupler, branch router, branch optical fiber are transmitted to optical network unit, and receive successively via branch optical fiber, branch router,
Multi-mode coupler, shunting coupler, the reflected light of the detection light of trunk optical fiber transmission, so as to according to the reflection for being detected
Light carries out fiber failure detection；
Wherein, the downlink business light that optical line terminal sends is successively via trunk optical fiber, shunting coupler, optical splitter, branch road
Transmitted to optical network unit by device, branch optical fiber；
Wherein, the uplink service light that optical network unit sends is successively via branch optical fiber, branch router, optical splitter, branch coupling
Clutch, trunk optical fiber are transmitted to optical line terminal.
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| WO2022099552A1 (en) * | 2020-11-12 | 2022-05-19 | Alibaba Group Holding Limited | System and method for real-time fiber performance monitoring |
| CN115100200B (en) * | 2022-08-24 | 2022-12-09 | 南通光烁通信设备有限公司 | Optical fiber defect detection method and system based on optical means |
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| CN102098098A (en) * | 2009-12-14 | 2011-06-15 | 中兴通讯股份有限公司 | System for detecting fiber faults of passive optical network |
| CN102201861A (en) * | 2010-03-24 | 2011-09-28 | 中兴通讯股份有限公司 | Fault detection system and method based on long-distance passive optical network |
| WO2011120372A1 (en) * | 2010-03-30 | 2011-10-06 | 华为技术有限公司 | System and method for detecting fiber fault, optical switch and passive optical network system |
| CN101924962A (en) * | 2010-08-25 | 2010-12-22 | 中兴通讯股份有限公司 | System and method thereof for detecting fiber faults |
| WO2012065459A1 (en) * | 2010-11-15 | 2012-05-24 | 中兴通讯股份有限公司 | System and method for testing fibre failure in passive optical network |
| 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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