CN104009794B - Method and apparatus for detecting fault in optical fiber of passive optical network - Google Patents
Method and apparatus for detecting fault in optical fiber of passive optical network Download PDFInfo
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- CN104009794B CN104009794B CN201310055961.8A CN201310055961A CN104009794B CN 104009794 B CN104009794 B CN 104009794B CN 201310055961 A CN201310055961 A CN 201310055961A CN 104009794 B CN104009794 B CN 104009794B
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Abstract
The invention discloses a method and apparatus for detecting a fault in optical fibers of a passive optical network. The method comprises a step in which a split coupler is disposed on a trunk optical fiber of the passive optical network, branch routers which are all connected with the split coupler through a multimode coupler are disposed on all branching optical fibers of the passive optical network; a step in which downlink service light emitted by an optical line terminal (OLT), uplink service lights emitted by optical network terminals, and an optical path detection light emitted by an optical time domain reflectometer (OTDR) run according to predetermined routes, however the reflected light of the optical path detection light emitted from the optical network terminals, through the branch routers, bypass an optical splitter and reach the multimode coupler, is coupled by the multimode coupler, and then enters the split coupler. Therefore, the loss of the reflected light is reduced, the signal to noise ratio of the reflected light is improved, the reflected light can smoothly reach the OTDR, and an aim that an operator can detect a fault of a branch optical fiber at the OLT is fulfilled.
Description
Technical field
The present invention relates to communication technical field, more particularly, to a kind of fault detection method of passive optical network optical fiber and dress
Put.
Background technology
EPON (PON is adopted for access network：Passive Optical Network), carry out light entering and copper back
Through becoming the first-selection of operator.EPON is a kind of point-to-multipoint (P2MP：Point to Multipoint) network,
The laying of substantial amounts of PON, it runs and safeguards the problem having become as operator's overriding concern, and the detection method commonly used at present is
OTDR fiber failure detection method, specifically as shown in figure 1, existing EPON includes optical line terminal (optical
Line terminal, OLT), wave-division multiplexer filter (Wavelength Division Multiplexing, WDM), light when
Domain reflectometer (Optical Time Domain Reflectometer, OTDR) and ONT Optical Network Terminal (Optical Network
Terminal, ONT), but because the beam splitter on EPON is the optical device of a high loss, it every point once light is just
There is 3 decibels of loss, for one 1:2NBeam splitter, its basic active loss be usually 3* (N+1) decibel about, such as：1:
32 beam splitter its be typically lost at 17.5 decibels about.And the method for the light path detection of OTDR is transmitting detection light, detect
Its reflected light, the precision of its detection depends on its dynamic range, and that is, the power of transmitting detection light deducts the reflected light detecting
Power, most of OTDR are at 40 to 45 decibels, and the EPON to 20 kilometers, generally 8 decibels of its loss,
And reflected light generally be to the maximum detect light 4%, that is, 13 decibels, so for 1:32 EPON OTDR at OLT
The reflected optical power of the branch optical fiber that can detect is that the power detecting light deducts (2*17.5+2*8+13), i.e. its dynamic range
Up to 64 decibels, this fortune fortune exceeds certainty of measurement and the scope of existing all of OTDR.In practice for 1:8 and above
ODN EPON, the fault-signal of its branch optical fiber can not have detected, so how effectively to detect no at OLT
All fiber failures of source optical-fiber network become problem demanding prompt solution.
Content of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of fault detection method of passive optical network optical fiber and device,
In order to solve the problems, such as can not effectively detect all fiber failures of EPON in prior art at OLT.
The purpose of the present invention is mainly achieved through the following technical solutions：
A kind of fiber failure detection method of EPON, including：
The trunk optical fiber of EPON arranges shunting coupler, and each branch in described EPON
Branch router is respectively provided with optical fiber, and all of described branch router is all coupled with described branch by multi-mode coupler
Device connects；
The downlink business light sending from optical line terminal, and the light path detection light warp successively sending from optical time domain reflectometer
First wavelength-division multiplex filter plate, described shunting coupler, beam splitter and described branch router reach on ONT Optical Network Terminal；
The uplink service light sending from described ONT Optical Network Terminal, and the light path detection light sending from each branch optical fiber
Reflected light reaches described branch router along described branch optical fiber, and uplink service light reaches described light splitting through described branch router
Device, then reach described shunting coupler through described beam splitter, the reflected light of the light path detection light that each branch optical fiber sends is through institute
State branch router and guide described multi-mode coupler, and enter described shunting coupler after the coupling of described multi-mode coupler, on
The reflected light of the light path detection light that industry business light sends with each branch optical fiber is passed through described after coupling through described shunting coupler
Trunk optical fiber guides the first wavelength-division multiplex filter plate, and described first wavelength-division multiplex filter plate is by uplink service light directing optical link eventually
End, and by the guides reflected light optical time domain reflectometer of light path detection light.
Preferably, described shunting coupler includes four interface optical circulators and the second wavelength-division multiplex filter plate；
The downlink business light sending from optical line terminal, and the light path detection light sending from optical time domain reflectometer passes through institute
State trunk optical fiber and reach described beam splitter through described four interface optical circulators；
It is multiple that the uplink service light sending from described beam splitter reaches described second wavelength-division through described four interface optical circulators
With filter plate, and the reflected light of the light path detection light after the coupling that described multi-mode coupler sends reaches described second ripple
The reflected light dividing the light path detection light after multiplexing filter plate, uplink service light and coupling is entered through described second wavelength-division multiplex filter plate
Reach described four interface optical circulators after row coupling, and reach first by described four interface optical circulators through described trunk optical fiber
Wavelength-division multiplex filter plate.
Preferably, described branch router includes four interface optical circulators and the 3rd wavelength-division multiplex filter plate；
The downlink business light sent from described beam splitter and light path detection light enter described through described four interface optical circulators
Branch optical fiber, and reach described ONT Optical Network Terminal through described branch optical fiber；
The uplink service light sending from described ONT Optical Network Terminal and the reflected light of light path detection light are through the described four interface rings of light
Shape device reaches described 3rd wavelength-division multiplex filter plate, and uplink service light reaches described four through described 3rd wavelength-division multiplex filter plate and connects
Mouthful optical circulator, and reach described beam splitters through described four interface optical circulators, the reflected light of light path detection light is through the described 3rd
Wavelength-division multiplex filter plate reaches described multi-mode coupler.
Preferably, described shunting coupler includes the first optical circulator, the second optical circulator and the filtering of the 4th wavelength-division multiplex
Piece；
The downlink business light sending from optical line terminal, and the light path detection light sending from optical time domain reflectometer passes through institute
State trunk optical fiber and reach described beam splitter through described first optical circulator and described second optical circulator；
The uplink service light sending from described beam splitter reaches described 4th wavelength-division multiplex through described second optical circulator
Filter plate, and reflected light described 4th wavelength-division of arrival of the light path detection light after the coupling that described multi-mode coupler sends
The reflected light of the light path detection light after multiplexing filter plate, uplink service light and coupling is carried out through described 4th wavelength-division multiplex filter plate
Reach described first optical circulator after coupling, and it is multiple to reach the first wavelength-division by described first optical circulator through described trunk optical fiber
Use filter plate.
Preferably, described branch router includes the first optical circulator, the second optical circulator and the filtering of the 5th wavelength-division multiplex
Piece；
The downlink business light sent from described beam splitter and light path detection light are through described first optical circulator and described second
Optical circulator enters described branch optical fiber, and reaches described ONT Optical Network Terminal through described branch optical fiber；
The uplink service light sending from described ONT Optical Network Terminal and the reflected light of light path detection light are gone in ring through described second light
Device reaches described 5th wavelength-division multiplex filter plate, and uplink service light reaches described first light through described 5th wavelength-division multiplex filter plate
Circulator, and reach described beam splitter through described first optical circulator, the reflected light of light path detection light is multiple through described 5th wavelength-division
Reach described multi-mode coupler with filter plate.
The present invention also provides a kind of fiber failure detection means of EPON, including：Optical time domain reflectometer, light splitting
Device, the first wavelength-division multiplex filter plate, shunting coupler, multi-mode coupler and branch router；
Described optical time domain reflectometer, for the light path detection light sending；
Described first wavelength-division multiplex filter plate, for by the downlink business light from described optical line terminal with from described
Trunk optical fiber is sent into after the light path detection optical coupling of optical time domain reflectometer, and by the uplink service receiving light and light path detection light
Reflected light carry out separate, uplink service light is sent to described optical line terminal, the reflected light of light path detection light is sent to
Optical time domain reflectometer；
Described shunting coupler, the light sending for the downlink business light that sends optical line terminal and optical time domain reflectometer
Journey detection light is sent to described beam splitter, and the uplink service light that described beam splitter is sent is sent with described multi-mode coupler
The reflected light of the light path detection light come is sent to described first wavelength-division multiplex filter plate after being coupled；
Described multi-mode coupler, the reflected light of the light path detection light for sending described branch router is coupled
Afterwards, it is sent to described shunting coupler；
Described beam splitter, downlink business light and light path detection light for sending described shunting coupler are sent to institute
State branch router, and the uplink service light that described branch router is sent is sent to described shunting coupler；
Described branch router, downlink business light and light path detection light for sending described beam splitter are sent to institute
State ONT Optical Network Terminal, and the uplink service light that described ONT Optical Network Terminal is sent is sent to described beam splitter, also will be from each point
The reflected light propping up the light path detection light that optical fiber sends is sent to described multi-mode coupler.
Preferably, described shunting coupler includes：Four interface optical circulators and the second wavelength-division multiplex filter plate；
Described four interface optical circulators, for the downlink business light sending optical line terminal, and optical time domain reflectometer
The light path detection light sending is sent to described beam splitter, and the uplink service light that described beam splitter is sent is sent to described
Two wavelength-division multiplex filter plates, the uplink service light after the coupling also described second wavelength-division multiplex filter plate being sent and light path inspection
The reflected light of light-metering is sent to described first wavelength-division multiplex filter plate through described trunk optical fiber；
Described second wavelength-division multiplex filter plate, for the uplink service light that sends described four interface optical circulators and institute
State the light path detection light that multi-mode coupler sends reflected light coupled after be sent to described four interface optical circulators.
Preferably, described branch router includes：Four interface optical circulators and the 3rd wavelength-division multiplex filter plate；
Described four interface optical circulators, downlink business light and light path detection light for sending described beam splitter send
To described ONT Optical Network Terminal, and the reflected light of uplink service light that described ONT Optical Network Terminal is sent and light path detection light sends
To described 3rd wavelength-division multiplex filter plate, the uplink service light also sending described 3rd wavelength-division multiplex filter plate is sent to institute
State beam splitter；
Described 3rd wavelength-division multiplex filter plate, the uplink service light for sending described four interface optical circulators is sent out again
Back to described four interface optical circulators, and the reflected light of the light path detection light that described four interface optical circulators are sent is sent to
Described multi-mode coupler.
Preferably, described shunting coupler includes the first optical circulator, the second optical circulator and the filtering of the 4th wavelength-division multiplex
Piece；
Described first optical circulator, for the downlink business light sending optical line terminal, and optical time domain reflectometer is sent out
After the light path detection light going out sends described second optical circulator, and the coupling that described 4th wavelength-division multiplex filter plate is sent
The reflected light of uplink service light and light path detection light is sent to described first wavelength-division multiplex filter plate；
Described 4th wavelength-division multiplex filter plate, for the uplink service light that sends described second optical circulator and described
The reflected light of the light path detection light that multi-mode coupler sends is coupled, and the uplink service light after coupling and light path are detected
The reflected light of light is sent to described first optical circulator；
Described second optical circulator, for the downlink business light of reception and light path detection light are sent to described beam splitter,
And the uplink service light sending described beam splitter is sent to described 4th wavelength-division multiplex filter plate.
Preferably, described branch router includes：First optical circulator, the second optical circulator and the filtering of the 5th wavelength-division multiplex
Piece；
Described first optical circulator, for described beam splitter, the downlink business light sending and light path detection light are sent to institute
State the second optical circulator, and the uplink service light that described 5th wavelength-division multiplex filter plate is sent is sent to described beam splitter；
Described second optical circulator, for the downlink business light that sends described first optical circulator and light path detection light
It is sent to described ONT Optical Network Terminal, and described ONT Optical Network Terminal is sent uplink service light and the reflected light of light path detection light is sent out
Give described 5th wavelength-division multiplex filter plate；
Described 5th wavelength-division multiplex filter plate, the uplink service light for sending described second optical circulator is sent to
Described first optical circulator, and the reflected light of the light path detection light that described second optical circulator is sent is sent to described multimode
Bonder.
The present invention has the beneficial effect that：
A kind of fiber failure detection method of EPON and device that the present invention provides, by setting on trunk optical fiber
Put shunting coupler, and branch router be respectively provided with each branch optical fiber, make downlink business light, light path detection light with
And uplink service light all walks the path of original beam splitter, and the reflected light of the light path detection light of each branch optical fiber is then by branch
Router detours multi-mode coupler, then reaches OTDR through shunting coupler, and that is, the reflected light of light path detection light has bypassed light splitting
Device is directed to multi-mode coupler, decreases the loss of reflected light, have submitted its signal to noise ratio so that reflected light can smoothly reach
On OTDR, reach the purpose that operator goes out detection branches fiber failure in OLT.
Other features and advantages of the present invention will illustrate in the following description, and, partial becoming from description
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write
In book, claims and accompanying drawing, specifically noted structure is realizing and to obtain.
Brief description
Fig. 1 is the failure detector schematic diagram of passive optical network optical fiber in prior art；
Fig. 2 is the failure detector schematic diagram of the passive optical network optical fiber of the present invention；
Fig. 3 is the multi-mode coupler schematic diagram of the present invention；
Fig. 4 is the shunting coupler schematic diagram of the present invention；
Fig. 5 is another kind of shunting coupler schematic diagram of the present invention；
Fig. 6 is the branch router schematic diagram of the present invention；
Fig. 7 is another kind of branch router schematic diagram of the present invention.
Specific embodiment
To specifically describe the preferred embodiments of the present invention below in conjunction with the accompanying drawings, wherein, accompanying drawing constitutes the application part, and
It is used for together with embodiments of the present invention explaining the principle of the present invention.For purpose of clarity and simplification, when it may make the present invention
Theme smudgy when, illustrating in detail of known function and structure in device described herein will be omitted.
As shown in figure 1, the embodiment of the present invention includes optical line terminal (optical line terminal, OLT), wavelength-division
Multiplex filter (Wavelength Division Multiplexing, WDM), optical time domain reflectometer (Optical Time
Domain Reflectometer, OTDR) and ONT Optical Network Terminal (Optical Network Terminal/Unit, ONT/
ONU).
Embodiment 1
Embodiments provide a kind of fiber failure detection method of EPON, referring to Fig. 2, the method bag
Include：
The trunk optical fiber of EPON arranges shunting coupler, and each branch in described EPON
Branch router is respectively provided with optical fiber, and all of described branch router is all coupled with described branch by multi-mode coupler
Device connects；
The downlink business light sending from OLT, and the light path detection light sending from OTDR filters through the first wavelength-division multiplex successively
Wave plate, described shunting coupler, beam splitter and described branch router reach on ONU or ONT；
The uplink service light sending from described ONT/ONU, and the light path detection light sending from each branch optical fiber is anti-
Penetrate light and reach described branch router along described branch optical fiber, uplink service light reaches described light splitting through described branch router
Device, then reach described shunting coupler through described beam splitter, the reflected light of the light path detection light that each branch optical fiber sends is through institute
State branch router and guide described multi-mode coupler, and enter described shunting coupler after the coupling of described multi-mode coupler, on
The reflected light of the light path detection light that industry business light sends with each branch optical fiber is passed through described after coupling through described shunting coupler
Trunk optical fiber guides the first wavelength-division multiplex filter plate, and described first wavelength-division multiplex filter plate is by uplink service light directing OLT, and incites somebody to action
In guides reflected light OTDR of light path detection light.
Certainly, those skilled in the art can also according to actual needs OTDR function be built in the optical module of OLT,
By OLT by from described optical line terminal downlink business light and from described built-in optical time domain reflectometer light path detection light
It is sent directly into trunk optical fiber after internally being coupled, and the reflected light of the uplink service receiving light and light path detection light is existed
Separated inside optical module and processed.
The structure of the multi-mode coupler in the embodiment of the present invention is as shown in figure 3, one end of multi-mode coupler is multimode passage
Or multimode fibre, and the other end is multiple single mode passages or multiple single-mode fiber composition, lens or coupling channel handle are passed through in centre
They are coupled, and in the present embodiment, mainly apply its single mode passage to the light path of multimode passage, should according to prior art
The loss of the light path only one of which decibel in direction, therefore meeting this bypass is low-loss demand.
As shown in figure 4, the shunting coupler in the embodiment of the present invention is by four interface circulators and the filter of the second wavelength-division multiplex
Wave plate forms, and four interface optical circulators have four interfaces, and interface 1 is import, only allows light to enter；And interface 2 is into and out mouth, only
Allow to go out from interface 2 from interface 1, and the light come in from interface 2 is gone out from interface 3；Interface 3 is also import and export,
Only allow to go out from interface 3 from interface 2, and the light come in from interface 3 is gone out from interface 4；Interface 4 is outlet, and it is only permitted
Perhaps the light that interface 3 is come in is gone out from its interface.
And the second wavelength-division multiplex filter plate is the wave filter of three interfaces, it is by edge film filtering slice (Edge
TFF) form with lens, the separation wavelength of filter plate is scheduled on 1620nm, if by light less than 1620nm when, will be from its transmission
Mouthful P and general mouth C turnover, and pass through light more than 1620nm when, mouthful R and general mouth C turnover will be reflected from it；And lens
Filter plate general mouth C with couple between single-mode fiber, adjust the distance between they so that reflective interface from filter plate
The light overwhelming majority of the multimode fibre come in can be coupled into coupled single-mode fiber from the general mouth of filter plate.
The interface 1 of four interface circulators is connected with the general mouth C of the second wavelength-division multiplex filter plate, the connecing of four interface circulators
Mouth 2 is connected with trunk optical fiber, and interface 3 is connected with the general-purpose interface of beam splitter, the transmission of interface 4 and the second wavelength-division multiplex filter plate
Interface is connected, and the reflective interface of the second wavelength-division multiplex filter plate is connected with the multimode fibre interface of mode coupler.
The embodiment of the present invention additionally provides another kind of shunting coupler, concrete as shown in figure 5, this shunting coupler includes the
One optical circulator, the second optical circulator and the 4th wavelength-division multiplex filter plate, the interface 2 of the first optical circulator connects trunk optical fiber,
The interface 3 of the first optical circulator is connected with the interface 1 of the second optical circulator, and the interface 2 of the second optical circulator and beam splitter
General-purpose interface is connected, and the interface 3 of the second optical circulator is connected with the transmission interface of the 4th wavelength-division multiplex filter plate, and the 4th wavelength-division is multiple
It is connected with the multimode fibre interface of mode coupler with the reflective interface of filter plate, and the 4th the general of wavelength-division multiplex filter plate connects
Mouth is connected with the interface 1 of the first optical circulator.The 4th wavelength-division multiplex in the workflow of the 4th wavelength-division multiplex filter plate and Fig. 4
The workflow of filter plate is identical, and here is no longer repeated.
The embodiment of the present invention additionally provides a kind of branch router, specifically as shown in fig. 6, this branch router includes four and connects
Mouthful optical circulator and the 3rd wavelength-division multiplex filter plate, the downlink business light sent from described beam splitter and light path detection light are through described
Four interface optical circulators enter described branch optical fiber, and reach described ONT or ONU through described branch optical fiber；
The uplink service light sending from described ONT or ONU and the reflected light of light path detection light are through described four interface light annulars
Device reaches described 3rd wavelength-division multiplex filter plate, and uplink service light reaches described four interfaces through described 3rd wavelength-division multiplex filter plate
Optical circulator, and reach described beam splitter through described four interface optical circulators, the reflected light of light path detection light is through described 3rd ripple
Multiplexing filter plate is divided to reach described multi-mode coupler.
The embodiment of the present invention additionally provides another kind of branch router, concrete as shown in fig. 7, this branch router includes the
One optical circulator, the second optical circulator and the 5th wavelength-division multiplex filter plate；
The downlink business light sent from described beam splitter and light path detection light are through described first optical circulator and described second
Optical circulator enters described branch optical fiber, and reaches described ONT or ONU through described branch optical fiber；
The uplink service light sending from described ONT or ONU and the reflected light of light path detection light are through described second optical circulator
Reach described 5th wavelength-division multiplex filter plate, uplink service light reaches described first ring of light through described 5th wavelength-division multiplex filter plate
Row device, and reach described beam splitter through described first optical circulator, the reflected light of light path detection light is through described 5th wavelength-division multiplex
Filter plate reaches described multi-mode coupler.
A kind of fiber failure detection method of EPON provided in an embodiment of the present invention, by setting on trunk optical fiber
Put shunting coupler, and branch router be respectively provided with each branch optical fiber, make downlink business light, light path detection light with
And uplink service light all walks the path of original beam splitter, and the reflected light of the light path detection light of each branch optical fiber is then by branch
Router detours multi-mode coupler, then reaches OTDR through shunting coupler, and that is, the reflected light of light path detection light has bypassed light splitting
Device is directed to multi-mode coupler, decreases the loss of reflected light, have submitted its signal to noise ratio so that reflected light can smoothly reach
On OTDR, reach the purpose that operator goes out detection branches fiber failure in OLT.
Embodiment 2
Embodiments provide a kind of fiber failure detection means of EPON, including：OTDR, beam splitter,
First wavelength-division multiplex filter plate, shunting coupler, multi-mode coupler and branch router；
Described OTDR, for the light path detection light sending；
Described first wavelength-division multiplex filter plate, for by from optical line terminal downlink business light and from described smooth when
Trunk optical fiber is sent into after the light path detection optical coupling of domain reflectometer, and the uplink service receiving light and light path detection light is anti-
Penetrate light to carry out separating, uplink service light is sent to described OLT, the reflected light of light path detection light is sent to OTDR；
Described shunting coupler, the light path detection light sending for the downlink business light that sends OLT and OTDR is sent to
Described beam splitter, and the light path detection light that the uplink service light that described beam splitter is sent is sent with described multi-mode coupler
Reflected light coupled after be sent to described first wavelength-division multiplex filter plate；
Described multi-mode coupler, the reflected light of the light path detection light for sending described branch router is coupled
Afterwards, it is sent to described shunting coupler；
Described beam splitter, downlink business light and light path detection light for sending described shunting coupler are sent to institute
State branch router, and the uplink service light that described branch router is sent is sent to described shunting coupler；
Described branch router, downlink business light and light path detection light for sending described beam splitter are sent to institute
State ONT or ONU, and the uplink service light that described ONT or ONU is sent is sent to described beam splitter, also will be from each branch's light
The reflected light of the light path detection light that fibre sends is sent to described multi-mode coupler.
Shunting coupler in the embodiment of the present invention includes：Four interface optical circulators and the second wavelength-division multiplex filter plate, tool
Body is as shown in Figure 4；
Described four interface optical circulators, for the downlink business light sending OLT, and the light path detection light that OTDR sends
It is sent to described beam splitter, and the uplink service light that described beam splitter is sent is sent to described second wavelength-division multiplex filtering
Piece, the uplink service light after the coupling also described second wavelength-division multiplex filter plate being sent and the reflected light warp of light path detection light
Described trunk optical fiber is sent to described first wavelength-division multiplex filter plate；
Described second wavelength-division multiplex filter plate, for the uplink service light that sends described four interface optical circulators and institute
State the light path detection light that multi-mode coupler sends reflected light coupled after be sent to described four interface optical circulators.
Branch router includes：Four interface optical circulators and the 3rd wavelength-division multiplex filter plate, specifically as shown in Figure 6；
Described four interface optical circulators, downlink business light and light path detection light for sending described beam splitter send
To described ONT or ONU, and the reflected light of uplink service light that described ONT or ONU is sent and light path detection light is sent to institute
State the 3rd wavelength-division multiplex filter plate, the uplink service light also sending described 3rd wavelength-division multiplex filter plate is sent to described point
Light device；
Described 3rd wavelength-division multiplex filter plate, the uplink service light for sending described four interface optical circulators is sent out again
Back to described four interface optical circulators, and the reflected light of the light path detection light that described four interface optical circulators are sent is sent to
Described multi-mode coupler.
The embodiment of the present invention additionally provides another kind of shunting coupler, concrete as shown in figure 5, this shunting coupler includes the
One optical circulator, the second optical circulator and the 4th wavelength-division multiplex filter plate；
Described first optical circulator, for the downlink business light sending OLT, and the light path detection light that OTDR sends is sent out
Send the uplink service light after described second optical circulator, and the coupling that described 4th wavelength-division multiplex filter plate is sent and light path
The reflected light of detection light is sent to described first wavelength-division multiplex filter plate；
Described 4th wavelength-division multiplex filter plate, for the uplink service light that sends described second optical circulator and described
The reflected light of the light path detection light that multi-mode coupler sends is coupled, and the uplink service light after coupling and light path are detected
The reflected light of light is sent to described first optical circulator；
Described second optical circulator, for the downlink business light of reception and light path detection light are sent to described beam splitter,
And the uplink service light sending described beam splitter is sent to described 4th wavelength-division multiplex filter plate.
The embodiment of the present invention additionally provides another kind of branch router, specifically as shown in fig. 7, this branch router includes：
First optical circulator, the second optical circulator and the 5th wavelength-division multiplex filter plate；
Described first optical circulator, for described beam splitter, the downlink business light sending and light path detection light are sent to institute
State the second optical circulator, and the uplink service light that described 5th wavelength-division multiplex filter plate is sent is sent to described beam splitter；
Described second optical circulator, for the downlink business light that sends described first optical circulator and light path detection light
It is sent to described ONT or ONU, and described ONT or ONU is sent uplink service light and the reflected light of light path detection light is sent to
Described 5th wavelength-division multiplex filter plate；
Described 5th wavelength-division multiplex filter plate, the uplink service light for sending described second optical circulator is sent to
Described first optical circulator, and the reflected light of the light path detection light that described second optical circulator is sent is sent to described multimode
Bonder.
In sum, a kind of fiber failure detection method of EPON provided in an embodiment of the present invention and device, leads to
Cross setting shunting coupler on trunk optical fiber, and branch router is respectively provided with each branch optical fiber, make lower industry
Business light, light path detection light and uplink service light all walk the path of original beam splitter, and the detection of the light path of each branch optical fiber
The reflected light of light is then detoured to multi-mode coupler by branch router, then reaches OTDR, i.e. light path detection light through shunting coupler
Reflected light bypassed beam splitter and be directed to multi-mode coupler, decrease the loss of reflected light, have submitted its signal to noise ratio so that anti-
Penetrate light can smoothly reach on OTDR, reach the purpose that operator goes out detection branches fiber failure in OLT.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in,
All should be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (10)
1. a kind of fiber failure detection method of EPON is it is characterised in that include：
The trunk optical fiber of EPON arranges shunting coupler, and each branch optical fiber in described EPON
On be respectively provided with branch router, and all of described branch router is all by multi-mode coupler with described shunting coupler even
Connect；
The downlink business light sending from optical line terminal, and the light path detection light sending from optical time domain reflectometer is successively through first
Wavelength-division multiplex filter plate, described shunting coupler, beam splitter and described branch router reach on ONT Optical Network Terminal；
The uplink service light sending from described ONT Optical Network Terminal, and the reflection of the light path detection light sending from each branch optical fiber
Light reaches described branch router along described branch optical fiber, and uplink service light reaches described beam splitter through described branch router,
Reach described shunting coupler through described beam splitter again, the reflected light of the light path detection light that each branch optical fiber sends is through described point
Road router guides described multi-mode coupler, and enters described shunting coupler, upper industry after the coupling of described multi-mode coupler
The reflected light of the light path detection light that business light sends with each branch optical fiber passes through described trunk after coupling through described shunting coupler
Optical fiber guide the first wavelength-division multiplex filter plate, described first wavelength-division multiplex filter plate by uplink service light directing optical line terminal,
And by the guides reflected light optical time domain reflectometer of light path detection light.
2. method according to claim 1 is it is characterised in that described shunting coupler includes four interface optical circulators and
Two wavelength-division multiplex filter plates；
The downlink business light sending from optical line terminal, and the light path detection light sending from optical time domain reflectometer passes through described master
Dry optical fiber reaches described beam splitter through described four interface optical circulators；
The uplink service light sending from described beam splitter reaches described second wavelength-division multiplex filter through described four interface optical circulators
Wave plate, and described second wavelength-division of reflected light arrival of the light path detection light after the coupling that described multi-mode coupler sends is multiple
With filter plate, the reflected light of the light path detection light after uplink service light and coupling carries out coupling through described second wavelength-division multiplex filter plate
Reach described four interface optical circulators after conjunction, and reach described first by described four interface optical circulators through described trunk optical fiber
Wavelength-division multiplex filter plate.
3. method according to claim 1 is it is characterised in that described branch router includes four interface optical circulators and
Three wavelength-division multiplex filter plates；
The downlink business light sent from described beam splitter and light path detection light enter described branches through described four interface optical circulators
Optical fiber, and reach described ONT Optical Network Terminal through described branch optical fiber；
The uplink service light sending from described ONT Optical Network Terminal and the reflected light of light path detection light are through described four interface optical circulators
Reach described 3rd wavelength-division multiplex filter plate, uplink service light reaches described four interface light through described 3rd wavelength-division multiplex filter plate
Circulator, and reach described beam splitter through described four interface optical circulators, the reflected light of light path detection light is through described 3rd wavelength-division
Multiplexing filter plate reaches described multi-mode coupler.
4. the method according to claim 1 or 3 it is characterised in that described shunting coupler include the first optical circulator,
Two optical circulators and the 4th wavelength-division multiplex filter plate；
The downlink business light sending from optical line terminal, and the light path detection light sending from optical time domain reflectometer passes through described master
Dry optical fiber reaches described beam splitter through described first optical circulator and described second optical circulator；
The uplink service light sending from described beam splitter reaches described 4th wavelength-division multiplex filtering through described second optical circulator
Piece, and reflected light described 4th wavelength-division multiplex of arrival of the light path detection light after the coupling that described multi-mode coupler sends
The reflected light of the light path detection light after filter plate, uplink service light and coupling is coupled through described 4th wavelength-division multiplex filter plate
After reach described first optical circulator, and it is multiple to reach described first wavelength-division by described first optical circulator through described trunk optical fiber
Use filter plate.
5. method according to claim 1 and 2 it is characterised in that described branch router include the first optical circulator,
Two optical circulators and the 5th wavelength-division multiplex filter plate；
The downlink business light sent from described beam splitter and light path detection light are through described first optical circulator and described second ring of light
Row device enters described branch optical fiber, and reaches described ONT Optical Network Terminal through described branch optical fiber；
The uplink service light that sends from described ONT Optical Network Terminal and the reflected light of light path detection light through described second optical circulator to
Reach described 5th wavelength-division multiplex filter plate, uplink service light reaches described first light through described 5th wavelength-division multiplex filter plate and goes in ring
Device, and reach described beam splitter through described first optical circulator, the reflected light of light path detection light is through described 5th wavelength-division multiplex filter
Wave plate reaches described multi-mode coupler.
6. a kind of fiber failure detection means of EPON is it is characterised in that include：Optical time domain reflectometer, beam splitter,
One wavelength-division multiplex filter plate, shunting coupler, multi-mode coupler and branch router；
Described optical time domain reflectometer, for the light path detection light sending；
Described first wavelength-division multiplex filter plate, for by from optical line terminal downlink business light and from described optical time domain anti-
Trunk optical fiber is sent into after the light path detection optical coupling penetrating instrument, and the reflected light by the uplink service receiving light and light path detection light
Carry out separating, uplink service light is sent to described optical line terminal, when the reflected light of light path detection light is sent to described smooth
Domain reflectometer；
Described shunting coupler, downlink business light and described optical time domain reflectometer for sending described optical line terminal send
Light path detection light be sent to described beam splitter, and uplink service light that described beam splitter is sent and described multi-mode coupler
The reflected light of the light path detection light sending is sent to described first wavelength-division multiplex filter plate after being coupled；
Described multi-mode coupler, after the reflected light of the light path detection light for sending described branch router is coupled,
It is sent to described shunting coupler；
Described beam splitter, downlink business light and light path detection light for sending described shunting coupler are sent to described point
Road router, and the uplink service light that described branch router is sent is sent to described shunting coupler；
Described branch router, downlink business light and light path detection light for sending described beam splitter are sent to described light
The network terminal, and the uplink service light that described ONT Optical Network Terminal is sent is sent to described beam splitter, also will be from each branch's light
The reflected light of the light path detection light that fibre sends is sent to described multi-mode coupler.
7. device according to claim 6 is it is characterised in that described shunting coupler includes：Four interface optical circulators and
Second wavelength-division multiplex filter plate；
Described four interface optical circulators, for the downlink business light sending optical line terminal, and optical time domain reflectometer sends
Light path detection light be sent to described beam splitter, and the uplink service light that described beam splitter is sent is sent to described second ripple
Divide multiplexing filter plate, the uplink service light after the coupling also described second wavelength-division multiplex filter plate being sent and light path detection light
Reflected light be sent to described first wavelength-division multiplex filter plate through described trunk optical fiber；
Described second wavelength-division multiplex filter plate, for the uplink service light that sends described four interface optical circulators and described many
The reflected light of the light path detection light that mode coupler sends is sent to described four interface optical circulators after being coupled.
8. device according to claim 6 is it is characterised in that described branch router includes：Four interface optical circulators and
3rd wavelength-division multiplex filter plate；
Described four interface optical circulators, downlink business light and light path detection light for sending described beam splitter are sent to institute
State ONT Optical Network Terminal, and the reflected light of uplink service light that described ONT Optical Network Terminal is sent and light path detection light is sent to institute
State the 3rd wavelength-division multiplex filter plate, the uplink service light also sending described 3rd wavelength-division multiplex filter plate is sent to described point
Light device；
Described 3rd wavelength-division multiplex filter plate, the uplink service light for sending described four interface optical circulators sends back to again
Described four interface optical circulators, and the reflected light of the light path detection light that described four interface optical circulators are sent be sent to described
Multi-mode coupler.
9. the device according to claim 6 or 8 it is characterised in that described shunting coupler include the first optical circulator,
Two optical circulators and the 4th wavelength-division multiplex filter plate；
Described first optical circulator, for the downlink business light sending optical line terminal, and optical time domain reflectometer sends
Up after light path detection light transmission described second optical circulator, and the coupling that described 4th wavelength-division multiplex filter plate is sent
The reflected light of business light and light path detection light is sent to described first wavelength-division multiplex filter plate；
Described 4th wavelength-division multiplex filter plate, for the uplink service light that sends described second optical circulator and described multimode
The reflected light of the light path detection light that bonder sends coupled, and by the uplink service light after coupling and light path detection light
Reflected light is sent to described first optical circulator；
Described second optical circulator, for the downlink business light of reception and light path detection light are sent to described beam splitter, and will
The uplink service light that described beam splitter sends is sent to described 4th wavelength-division multiplex filter plate.
10. the device according to claim 6 or 7 is it is characterised in that described branch router includes：First optical circulator,
Second optical circulator and the 5th wavelength-division multiplex filter plate；
Described first optical circulator, the downlink business light sending for described beam splitter and light path detection light are sent to described
Two optical circulators, and the uplink service light that described 5th wavelength-division multiplex filter plate is sent is sent to described beam splitter；
Described second optical circulator, downlink business light and light path detection light warp for sending described first optical circulator divide
Optical fiber is sent to described ONT Optical Network Terminal, and described ONT Optical Network Terminal is sent the anti-of uplink service light and light path detection light
Penetrate light and be sent to described 5th wavelength-division multiplex filter plate；
Described 5th wavelength-division multiplex filter plate, the uplink service light for sending described second optical circulator is sent to described
First optical circulator, and the reflected light of the light path detection light that described second optical circulator is sent is sent to described Multiple modes coupling
Device.
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| CN104038280A (en) * | 2013-03-04 | 2014-09-10 | 中兴通讯股份有限公司 | Fiber fault detection system and method of passive optical network |
| CN104253644B (en) * | 2014-09-10 | 2017-02-15 | 江苏宇特光电科技股份有限公司 | PON (passive optical network) monitoring system based on wavelength scanning narrow line width OTDR (optical time domain reflectometry), and PON monitoring method based on wavelength scanning narrow line width OTDR |
| WO2018137212A1 (en) * | 2017-01-25 | 2018-08-02 | 深圳太辰光通信股份有限公司 | Passive wavelength division mobile fronthaul network system |
| CN108933624A (en) * | 2018-09-14 | 2018-12-04 | 国网西藏电力有限公司 | A kind of optical link detection method and system may pass through gain unit |
| CN110855355B (en) * | 2019-11-21 | 2023-03-31 | 南京邮电大学 | Laminated intelligent checking system and checking method for optical fiber distribution route |
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| CN102195708A (en) * | 2011-06-22 | 2011-09-21 | 索尔思光电（成都）有限公司 | OLT (Optical Line Termination) optical module integrated with OTDR (Optical Time Domain Reflectometer) monitoring function |
| CN102415019A (en) * | 2009-04-30 | 2012-04-11 | 瑞典爱立信有限公司 | Method and apparatus for fault discovery in a passive optical network (PON) |
| CN102821330A (en) * | 2012-08-24 | 2012-12-12 | 烽火通信科技股份有限公司 | WDM-PON (wavelength division multiplexing-passive optical network) for performing OTDR (optical time domain reflectometry) test without influencing service |
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| CN102415019A (en) * | 2009-04-30 | 2012-04-11 | 瑞典爱立信有限公司 | Method and apparatus for fault discovery in a passive optical network (PON) |
| CN102195708A (en) * | 2011-06-22 | 2011-09-21 | 索尔思光电（成都）有限公司 | OLT (Optical Line Termination) optical module integrated with OTDR (Optical Time Domain Reflectometer) monitoring function |
| CN102821330A (en) * | 2012-08-24 | 2012-12-12 | 烽火通信科技股份有限公司 | WDM-PON (wavelength division multiplexing-passive optical network) for performing OTDR (optical time domain reflectometry) test without influencing service |
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