CN104009794A - 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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- CN104009794A CN104009794A CN201310055961.8A CN201310055961A CN104009794A CN 104009794 A CN104009794 A CN 104009794A CN 201310055961 A CN201310055961 A CN 201310055961A CN 104009794 A CN104009794 A CN 104009794A
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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, relate in particular to a kind of fault detection method and device of passive optical network optical fiber.
Background technology
Adopt EPON (PON:Passive Optical Network) for Access Network, carrying out light entering and copper back has become the first-selection of operator.EPON is the network of a kind of point-to-multipoint (P2MP:Point to Multipoint), the laying of a large amount of PON, its operation and maintenance has become the problem of operator's overriding concern, conventional detection method is OTDR fiber failure detection method at present, specifically as shown in Figure 1, existing EPON comprises optical line terminal (optical line terminal, OLT), wave-division multiplexer filter (Wavelength Division Multiplexing, WDM), optical time domain reflectometer (Optical Time Domain Reflectometer, and Optical Network Terminal (Optical Network Terminal OTDR), ONT), but because the optical splitter on EPON is the optical device of a high loss, its per minute once light just has the loss of 3 decibels, for a 1:2
noptical splitter, its basic active loss is generally 3* (N+1) about decibel, as: its typical loss of the optical splitter of 1:32 is 17.5 decibels of left and right.And the method that the light path of OTDR detects is transmitting detection light, survey its reverberation, the precision of its detection depends on its dynamic range, the power that i.e. transmitting detects light deducts the catoptrical power detecting, most of OTDR are at 40 to 45 decibels, and to the EPON of 20 kilometers, its loss is generally 8 decibels, and reverberation be generally be to the maximum survey light 4%, 13 decibels, the reflected optical power of the branch optical fiber that can detect at the OTDR of OLT place for the EPON of 1:32 is like this that the power of surveying light deducts (2*17.5+2*8+13), be that its dynamic range can reach 64 decibels, this fortune fortune exceeds certainty of measurement and the scope of existing all OTDR.In fact for 1:8 and above ODN EPON, the fault-signal of its branch optical fiber can not detect, and becomes problem demanding prompt solution so how effectively to detect all fiber failures of EPON at OLT place.
Summary of the invention
In view of above-mentioned analysis, the present invention aims to provide a kind of fault detection method and device of passive optical network optical fiber, in order to solve the problem that can not effectively detect at OLT place all fiber failures of EPON in prior art.
Object of the present invention is mainly achieved through the following technical solutions:
A fiber failure detection method for EPON, comprising:
On the trunk optical fiber of EPON, shunting coupler is set, and router is along separate routes set respectively on each branch optical fiber of described EPON, and all described shunt routers are all connected with described shunting coupler by multi-mode coupler;
The downlink business light sending from optical line terminal, and the light path sending from optical time domain reflectometer detects light successively through wavelength division multiplexing filter plate, described shunting coupler, optical splitter and described shunt router arrival Optical Network Terminal;
The uplink service light sending from described Optical Network Terminal, and the light path sending from each branch optical fiber detection reflection of light light arrives described shunt router along described branch optical fiber, uplink service light arrives described optical splitter through described shunt router, arrive described shunting coupler through described optical splitter again, light path that each branch optical fiber sends detects reflection of light light through the described shunt router described multi-mode coupler that leads, and enter described shunting coupler after described multi-mode coupler coupling, the light path that uplink service light and each branch optical fiber send detects reflection of light light and after described shunting coupler coupling, passes through described trunk optical fiber guiding wavelength division multiplexing filter plate, described wavelength division multiplexing filter plate by uplink service photoconduction to optical line terminal, and light path is detected to reflection of light photoconduction on optical time domain reflectometer.
Preferably, described shunting coupler comprises four interface optical circulators and wavelength division multiplexing filter plate;
The downlink business light sending from optical line terminal, and the light path sending from optical time domain reflectometer detection light arrives described optical splitter by described trunk optical fiber through described four interface optical circulators;
The uplink service light sending from described optical splitter arrives described wavelength division multiplexing filter plate through described four interface optical circulators, and light path the coupling of sending from described multi-mode coupler detects reflection of light light and arrives described wavelength division multiplexing filter plate, light path after uplink service light and coupling detects reflection of light light and after described wavelength division multiplexing filter plate is coupled, arrives described four interface optical circulators, and arrives wavelength division multiplexing filter plate by described four interface optical circulators through described trunk optical fiber.
Preferably, described shunt router comprises four interface optical circulators and wavelength division multiplexing filter plate;
The downlink business light of sending from described optical splitter and light path detect light and enter described branch optical fiber through described four interface optical circulators, and arrive described Optical Network Terminal through described branch optical fiber;
The uplink service light sending from described Optical Network Terminal and light path detect reflection of light light and arrive described wavelength division multiplexing filter plate through described four interface optical circulators, uplink service light arrives described four interface optical circulators through described wavelength division multiplexing filter plate, and arriving described optical splitter through described four interface optical circulators, light path detects reflection of light light and arrives described multi-mode coupler through described wavelength division multiplexing filter plate.
Preferably, described shunting coupler comprises the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
The downlink business light sending from optical line terminal, and the light path sending from optical time domain reflectometer detection light arrives described optical splitter by described trunk optical fiber through described the first optical circulator and described the second optical circulator;
The uplink service light sending from described optical splitter arrives described wavelength division multiplexing filter plate through described the second optical circulator, and light path the coupling of sending from described multi-mode coupler detects reflection of light light and arrives described wavelength division multiplexing filter plate, light path after uplink service light and coupling detects reflection of light light and after described wavelength division multiplexing filter plate is coupled, arrives described the first optical circulator, and arrives wavelength division multiplexing filter plate by described the first optical circulator through described trunk optical fiber.
Preferably, described shunt router comprises the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
The downlink business light of sending from described optical splitter and light path detect light and enter described branch optical fiber through described the first optical circulator and described the second optical circulator, and arrive described Optical Network Terminal through described branch optical fiber;
The uplink service light sending from described Optical Network Terminal and light path detect reflection of light light and arrive described wavelength division multiplexing filter plate through described the second optical circulator, uplink service light arrives described the first optical circulator through described wavelength division multiplexing filter plate, and arriving described optical splitter through described the first optical circulator, light path detects reflection of light light and arrives described multi-mode coupler through described wavelength division multiplexing filter plate.
The present invention also provides a kind of fiber failure checkout gear of EPON, comprising: optical time domain reflectometer, optical splitter, wavelength division multiplexing filter plate, shunting coupler, multi-mode coupler and shunt router;
Described optical time domain reflectometer, detects light for the light path sending;
Described wavelength division multiplexing filter plate, after detecting optical coupling by the downlink business light from described optical line terminal with from the light path of described optical time domain reflectometer, send into trunk optical fiber, and the uplink service light receiving and light path detection reflection of light light are separated, uplink service light is sent to described optical line terminal, light path is detected to reflection of light light and send to optical time domain reflectometer;
Described shunting coupler, the light path sending for downlink business light that optical line terminal is sent and optical time domain reflectometer detects light and sends to described optical splitter, and the light path detection reflection of light light that sends of the uplink service light that described optical splitter is sent and described multi-mode coupler sends to described wavelength division multiplexing filter plate after being coupled;
Described multi-mode coupler, after being coupled, sends to described shunting coupler for the light path detection reflection of light light that described shunt router is sent;
Described optical splitter, send to described shunt router, and the uplink service light that described shunt router is sent sends to described shunting coupler for downlink business light and light path detection light that described shunting coupler is sent;
Described shunt router, send to described Optical Network Terminal for downlink business light and light path detection light that described optical splitter is sent, and the uplink service light that described Optical Network Terminal is sent sends to described optical splitter, also the light path sending from each branch optical fiber is detected to reflection of light light and send to described multi-mode coupler.
Preferably, described shunting coupler comprises: four interface optical circulators and wavelength division multiplexing filter plate;
Described four interface optical circulators, for the downlink business light that optical line terminal is sent, and the light path detection light that optical time domain reflectometer sends sends to described optical splitter, and the uplink service light that described optical splitter is sent sends to described wavelength division multiplexing filter plate, the uplink service light after the coupling of also described wavelength division multiplexing filter plate being sent and light path detect reflection of light light and send to described wavelength division multiplexing filter plate through described trunk optical fiber;
Described wavelength division multiplexing filter plate, the light path sending for uplink service light that described four interface optical circulators are sent and described multi-mode coupler detects after reflection of light light is coupled and sends to described four interface optical circulators.
Preferably, described shunt router comprises: four interface optical circulators and wavelength division multiplexing filter plate;
Described four interface optical circulators, send to described Optical Network Terminal for downlink business light and light path detection light that described optical splitter is sent, and the uplink service light that described Optical Network Terminal is sent and light path detect reflection of light light and send to described wavelength division multiplexing filter plate, the uplink service light also described wavelength division multiplexing filter plate being sent sends to described optical splitter;
Described wavelength division multiplexing filter plate, sends back to described four interface optical circulators again for the uplink service light that described four interface optical circulators are sent, and the light path that described four interface optical circulators are sent detection reflection of light light sends to described multi-mode coupler.
Preferably, described shunting coupler comprises the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
Described the first optical circulator, for the downlink business light that optical line terminal is sent, and the light path that sends of optical time domain reflectometer detects light and send described the second optical circulator, and uplink service light after the coupling that described wavelength division multiplexing filter plate is sent and light path detect reflection of light light and send to described wavelength division multiplexing filter plate;
Described wavelength division multiplexing filter plate, the light path sending for uplink service light that described the second optical circulator is sent and described multi-mode coupler detects reflection of light light and is coupled, and the uplink service light after coupling and light path are detected to reflection of light light sends to described the first optical circulator;
Described the second optical circulator, for the downlink business light of reception and light path detection light are sent to described optical splitter, and the uplink service light that described optical splitter is sent sends to described wavelength division multiplexing filter plate.
Preferably, described shunt router comprises: the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
Described the first optical circulator, the downlink business light sending for described optical splitter and light path detect light and send to described the second optical circulator, and the uplink service light that described wavelength division multiplexing filter plate is sent sends to described optical splitter;
Described the second optical circulator, detect light for downlink business light that described the first optical circulator is sent and light path and send to described Optical Network Terminal, and described Optical Network Terminal is sent to uplink service light and light path and detect reflection of light light and send to described wavelength division multiplexing filter plate;
Described wavelength division multiplexing filter plate, sends to described the first optical circulator for the uplink service light that described the second optical circulator is sent, and the light path that described the second optical circulator is sent detection reflection of light light sends to described wavelength division multiplexing filter plate.
Beneficial effect of the present invention is as follows:
Fiber failure detection method and the device of a kind of EPON provided by the invention, by shunting coupler is set on trunk optical fiber, and along separate routes router is set respectively on each branch optical fiber, make downlink business light, light path detection light and uplink service light are all walked the path of original optical splitter, the light path of each branch optical fiber detects reflection of light light by the shunt router multi-mode coupler that detours, arrive OTDR through shunting coupler again, be that light path detects reflection of light light and walked around optical splitter and be directed to multi-mode coupler, reduce catoptrical loss, submit its signal to noise ratio to, reverberation can be arrived on OTDR smoothly, reach operator goes out detection branches fiber failure object at OLT.
Other features and advantages of the present invention will be set forth in the following description, and, part from specification, become apparent, or by implement the present invention understand.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in write specification, claims and accompanying drawing.
Brief description of the drawings
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 passive optical network optical fiber of the present invention;
Fig. 3 is multi-mode coupler schematic diagram of the present invention;
Fig. 4 is 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 shunt router schematic diagram of the present invention;
Fig. 7 is another kind of router schematic diagram along separate routes of the present invention.
Embodiment
Specifically describe the preferred embodiments of the present invention below in conjunction with accompanying drawing, wherein, accompanying drawing forms the application's part, and together with embodiments of the present invention for explaining principle of the present invention.For purpose of clarity and simplification, in the time that it may make theme of the present invention smudgy, by illustrating in detail of known function and structure in omission device described herein.
As shown in Figure 1, the embodiment of the present invention comprises optical line terminal (optical line terminal, OLT), wave-division multiplexer filter (Wavelength Division Multiplexing, WDM), optical time domain reflectometer (Optical Time Domain Reflectometer, and Optical Network Terminal (Optical Network Terminal/Unit, ONT/ONU) OTDR).
Embodiment 1
The embodiment of the present invention provides a kind of fiber failure detection method of EPON, and referring to Fig. 2, the method comprises:
On the trunk optical fiber of EPON, shunting coupler is set, and router is along separate routes set respectively on each branch optical fiber of described EPON, and all described shunt routers are all connected with described shunting coupler by multi-mode coupler;
The downlink business light sending from OLT, and the light path sending from OTDR detects light successively through wavelength division multiplexing filter plate, described shunting coupler, optical splitter and described shunt router arrival ONU or ONT;
The uplink service light sending from described ONT/ONU, and the light path sending from each branch optical fiber detection reflection of light light arrives described shunt router along described branch optical fiber, uplink service light arrives described optical splitter through described shunt router, arrive described shunting coupler through described optical splitter again, light path that each branch optical fiber sends detects reflection of light light through the described shunt router described multi-mode coupler that leads, and enter described shunting coupler after described multi-mode coupler coupling, the light path that uplink service light and each branch optical fiber send detects reflection of light light and after described shunting coupler coupling, passes through described trunk optical fiber guiding wavelength division multiplexing filter plate, described wavelength division multiplexing filter plate by uplink service photoconduction to OLT, and light path is detected to reflection of light photoconduction on OTDR.
Certainly, those skilled in the art also can be built in OTDR function in the optical module of OLT according to actual needs, after inside is coupled, directly send the downlink business light from described optical line terminal with from the light path detection light of described built in light time-domain reflectomer into trunk optical fiber by OLT, and the uplink service light receiving and light path detection reflection of light light are separated and processed in optical module inside.
The structure of the multi-mode coupler in the embodiment of the present invention as shown in Figure 3, one end of multi-mode coupler is multimode passage or multimode fiber, and the other end is multiple single mode passages or multiple monomode fiber composition, middle scioptics or coupling channel are coupled them, in the present embodiment, main its single mode passage of application, to the light path of multimode passage, only has the loss of a decibel according to the light path of this direction of prior art, therefore meeting this bypass is low-loss demand.
As shown in Figure 4, the shunting coupler in the embodiment of the present invention is made up of four interface circulators and wavelength division multiplexing filter plate, and four interface optical circulators have four interfaces, and interface 1 is import, only allows light to enter; And interface 2 is to import and export, a permission is gone out from interface 2 from interface 1, and the light of coming in from interface 2 is gone out from interface 3; Interface 3 is also import and export, and a permission is gone out from interface 3 from interface 2, and the light of coming in from interface 3 is gone out from interface 4; Interface 4 is outlets, and it only allows the light that interface 3 is come in to go out from its interface.
And wavelength division multiplexing filter plate is the filter of three interfaces, it is made up of edge film filtering slice (Edge TFF) and lens, the separate wavelengths of filter plate fixes on 1620nm, if by light be less than 1620nm time, will be from its transmission mouth P and general mouthful of C turnover, and by light be greater than 1620nm time, will be from its reflex port R and general mouthful C turnover; And lens are between the general mouth C and coupling monomode fiber of filter plate, adjust the distance between them, the light overwhelming majority of the multimode fiber of coming in from the reflective interface of filter plate can be coupled into coupled monomode fiber from general mouthful of filter plate.
The interface 1 of four interface circulators is connected with general mouthful of C of wavelength division multiplexing filter plate, the interface 2 of four interface circulators is connected with trunk optical fiber, interface 3 is connected with the general-purpose interface of optical splitter, interface 4 is connected with the transmission interface of wavelength division multiplexing filter plate, and the reflective interface of wavelength division multiplexing filter plate is connected with the multimode fiber interface of mode coupler.
The embodiment of the present invention also provides another kind of shunting coupler, specifically as shown in Figure 5, this shunting coupler comprises the first optical circulator, the second optical circulator and wavelength division multiplexing 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 is connected with the general-purpose interface of optical splitter, the interface 3 of the second optical circulator is connected with the transmission interface of wavelength division multiplexing filter plate, the reflective interface of wavelength division multiplexing filter plate is connected with the multimode fiber interface of mode coupler, and the general-purpose interface of wavelength division multiplexing filter plate is connected with the interface 1 of the first optical circulator.The workflow of wavelength division multiplexing filter plate is identical with the workflow of the wavelength division multiplexing filter plate in Fig. 4, no longer repeats at this.
The embodiment of the present invention also provides a kind of shunt router, specifically as shown in Figure 6, this shunt router comprises four interface optical circulators and wavelength division multiplexing filter plate, the downlink business light of sending from described optical splitter and light path detect light and enter described branch optical fiber through described four interface optical circulators, and arrive described ONT or ONU through described branch optical fiber;
The uplink service light sending from described ONT or ONU and light path detect reflection of light light and arrive described wavelength division multiplexing filter plate through described four interface optical circulators, uplink service light arrives described four interface optical circulators through described wavelength division multiplexing filter plate, and arriving described optical splitter through described four interface optical circulators, light path detects reflection of light light and arrives described multi-mode coupler through described wavelength division multiplexing filter plate.
The embodiment of the present invention also provides another kind of shunt router, and specifically as shown in Figure 7, this shunt router comprises the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
The downlink business light of sending from described optical splitter and light path detect light and enter described branch optical fiber through described the first optical circulator and described the second optical circulator, and arrive described ONT or ONU through described branch optical fiber;
The uplink service light sending from described ONT or ONU and light path detect reflection of light light and arrive described wavelength division multiplexing filter plate through described the second optical circulator, uplink service light arrives described the first optical circulator through described wavelength division multiplexing filter plate, and arriving described optical splitter through described the first optical circulator, light path detects reflection of light light and arrives described multi-mode coupler through described wavelength division multiplexing filter plate.
The fiber failure detection method of a kind of EPON that the embodiment of the present invention provides, by shunting coupler is set on trunk optical fiber, and along separate routes router is set respectively on each branch optical fiber, make downlink business light, light path detection light and uplink service light are all walked the path of original optical splitter, the light path of each branch optical fiber detects reflection of light light by the shunt router multi-mode coupler that detours, arrive OTDR through shunting coupler again, be that light path detects reflection of light light and walked around optical splitter and be directed to multi-mode coupler, reduce catoptrical loss, submit its signal to noise ratio to, reverberation can be arrived on OTDR smoothly, reach operator goes out detection branches fiber failure object at OLT.
Embodiment 2
The embodiment of the present invention provides a kind of fiber failure checkout gear of EPON, comprising: OTDR, optical splitter, wavelength division multiplexing filter plate, shunting coupler, multi-mode coupler and shunt router;
Described OTDR, detects light for the light path sending;
Described wavelength division multiplexing filter plate, after detecting optical coupling by the downlink business light from optical line terminal with from the light path of described optical time domain reflectometer, send into trunk optical fiber, and the uplink service light receiving and light path detection reflection of light light are separated, uplink service light is sent to described OLT, light path is detected to reflection of light light and send to OTDR;
Described shunting coupler, the light path sending for downlink business light that OLT is sent and OTDR detects light and sends to described optical splitter, and the light path detection reflection of light light that sends of the uplink service light that described optical splitter is sent and described multi-mode coupler sends to described wavelength division multiplexing filter plate after being coupled;
Described multi-mode coupler, after being coupled, sends to described shunting coupler for the light path detection reflection of light light that described shunt router is sent;
Described optical splitter, send to described shunt router, and the uplink service light that described shunt router is sent sends to described shunting coupler for downlink business light and light path detection light that described shunting coupler is sent;
Described shunt router, send to described ONT or ONU for downlink business light and light path detection light that described optical splitter is sent, and the uplink service light that described ONT or ONU send is sent to described optical splitter, also the light path sending from each branch optical fiber is detected to reflection of light light and send to described multi-mode coupler.
Shunting coupler in the embodiment of the present invention comprises: four interface optical circulators and wavelength division multiplexing filter plate, specifically as shown in Figure 4;
Described four interface optical circulators, for the downlink business light that OLT is sent, and the light path detection light that OTDR sends sends to described optical splitter, and the uplink service light that described optical splitter is sent sends to described wavelength division multiplexing filter plate, the uplink service light after the coupling of also described wavelength division multiplexing filter plate being sent and light path detect reflection of light light and send to described wavelength division multiplexing filter plate through described trunk optical fiber;
Described wavelength division multiplexing filter plate, the light path sending for uplink service light that described four interface optical circulators are sent and described multi-mode coupler detects after reflection of light light is coupled and sends to described four interface optical circulators.
Router comprises along separate routes: four interface optical circulators and wavelength division multiplexing filter plate, specifically as shown in Figure 6;
Described four interface optical circulators, send to described ONT or ONU for downlink business light and light path detection light that described optical splitter is sent, and the uplink service light that described ONT or ONU are sent and light path detect reflection of light light and send to described wavelength division multiplexing filter plate, the uplink service light also described wavelength division multiplexing filter plate being sent sends to described optical splitter;
Described wavelength division multiplexing filter plate, sends back to described four interface optical circulators again for the uplink service light that described four interface optical circulators are sent, and the light path that described four interface optical circulators are sent detection reflection of light light sends to described multi-mode coupler.
The embodiment of the present invention also provides another kind of shunting coupler, and specifically as shown in Figure 5, this shunting coupler comprises the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
Described the first optical circulator, for the downlink business light that OLT is sent, and the light path that sends of OTDR detects light and send described the second optical circulator, and uplink service light after the coupling that described wavelength division multiplexing filter plate is sent and light path detect reflection of light light and send to described wavelength division multiplexing filter plate;
Described wavelength division multiplexing filter plate, the light path sending for uplink service light that described the second optical circulator is sent and described multi-mode coupler detects reflection of light light and is coupled, and the uplink service light after coupling and light path are detected to reflection of light light sends to described the first optical circulator;
Described the second optical circulator, for the downlink business light of reception and light path detection light are sent to described optical splitter, and the uplink service light that described optical splitter is sent sends to described wavelength division multiplexing filter plate.
The embodiment of the present invention also provides another kind of shunt router, and specifically as shown in Figure 7, this shunt router comprises: the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
Described the first optical circulator, the downlink business light sending for described optical splitter and light path detect light and send to described the second optical circulator, and the uplink service light that described wavelength division multiplexing filter plate is sent sends to described optical splitter;
Described the second optical circulator, detect light for downlink business light that described the first optical circulator is sent and light path and send to described ONT or ONU, and described ONT or ONU are sent to uplink service light and light path and detect reflection of light light and send to described wavelength division multiplexing filter plate;
Described wavelength division multiplexing filter plate, sends to described the first optical circulator for the uplink service light that described the second optical circulator is sent, and the light path that described the second optical circulator is sent detection reflection of light light sends to described wavelength division multiplexing filter plate.
In sum, fiber failure detection method and the device of a kind of EPON that the embodiment of the present invention provides, by shunting coupler is set on trunk optical fiber, and along separate routes router is set respectively on each branch optical fiber, make downlink business light, light path detection light and uplink service light are all walked the path of original optical splitter, the light path of each branch optical fiber detects reflection of light light by the shunt router multi-mode coupler that detours, arrive OTDR through shunting coupler again, be that light path detects reflection of light light and walked around optical splitter and be directed to multi-mode coupler, reduce catoptrical loss, submit its signal to noise ratio to, reverberation can be arrived on OTDR smoothly, reach operator goes out detection branches fiber failure object at OLT.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (10)
1. a fiber failure detection method for EPON, is characterized in that, comprising:
On the trunk optical fiber of EPON, shunting coupler is set, and router is along separate routes set respectively on each branch optical fiber of described EPON, and all described shunt routers are all connected with described shunting coupler by multi-mode coupler;
The downlink business light sending from optical line terminal, and the light path sending from optical time domain reflectometer detects light successively through wavelength division multiplexing filter plate, described shunting coupler, optical splitter and described shunt router arrival Optical Network Terminal;
The uplink service light sending from described Optical Network Terminal, and the light path sending from each branch optical fiber detection reflection of light light arrives described shunt router along described branch optical fiber, uplink service light arrives described optical splitter through described shunt router, arrive described shunting coupler through described optical splitter again, light path that each branch optical fiber sends detects reflection of light light through the described shunt router described multi-mode coupler that leads, and enter described shunting coupler after described multi-mode coupler coupling, the light path that uplink service light and each branch optical fiber send detects reflection of light light and after described shunting coupler coupling, passes through described trunk optical fiber guiding wavelength division multiplexing filter plate, described wavelength division multiplexing filter plate by uplink service photoconduction to optical line terminal, and light path is detected to reflection of light photoconduction on optical time domain reflectometer.
2. method according to claim 1, is characterized in that, described shunting coupler comprises four interface optical circulators and wavelength division multiplexing filter plate;
The downlink business light sending from optical line terminal, and the light path sending from optical time domain reflectometer detection light arrives described optical splitter by described trunk optical fiber through described four interface optical circulators;
The uplink service light sending from described optical splitter arrives described wavelength division multiplexing filter plate through described four interface optical circulators, and light path the coupling of sending from described multi-mode coupler detects reflection of light light and arrives described wavelength division multiplexing filter plate, light path after uplink service light and coupling detects reflection of light light and after described wavelength division multiplexing filter plate is coupled, arrives described four interface optical circulators, and arrives wavelength division multiplexing filter plate by described four interface optical circulators through described trunk optical fiber.
3. method according to claim 1, is characterized in that, described shunt router comprises four interface optical circulators and wavelength division multiplexing filter plate;
The downlink business light of sending from described optical splitter and light path detect light and enter described branch optical fiber through described four interface optical circulators, and arrive described Optical Network Terminal through described branch optical fiber;
The uplink service light sending from described Optical Network Terminal and light path detect reflection of light light and arrive described wavelength division multiplexing filter plate through described four interface optical circulators, uplink service light arrives described four interface optical circulators through described wavelength division multiplexing filter plate, and arriving described optical splitter through described four interface optical circulators, light path detects reflection of light light and arrives described multi-mode coupler through described wavelength division multiplexing filter plate.
4. according to the method described in claim 1-3 any one, it is characterized in that, described shunting coupler comprises the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
The downlink business light sending from optical line terminal, and the light path sending from optical time domain reflectometer detection light arrives described optical splitter by described trunk optical fiber through described the first optical circulator and described the second optical circulator;
The uplink service light sending from described optical splitter arrives described wavelength division multiplexing filter plate through described the second optical circulator, and light path the coupling of sending from described multi-mode coupler detects reflection of light light and arrives described wavelength division multiplexing filter plate, light path after uplink service light and coupling detects reflection of light light and after described wavelength division multiplexing filter plate is coupled, arrives described the first optical circulator, and arrives wavelength division multiplexing filter plate by described the first optical circulator through described trunk optical fiber.
5. according to the method described in claim 1-3 any one, it is characterized in that, described shunt router comprises the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
The downlink business light of sending from described optical splitter and light path detect light and enter described branch optical fiber through described the first optical circulator and described the second optical circulator, and arrive described Optical Network Terminal through described branch optical fiber;
The uplink service light sending from described Optical Network Terminal and light path detect reflection of light light and arrive described wavelength division multiplexing filter plate through described the second optical circulator, uplink service light arrives described the first optical circulator through described wavelength division multiplexing filter plate, and arriving described optical splitter through described the first optical circulator, light path detects reflection of light light and arrives described multi-mode coupler through described wavelength division multiplexing filter plate.
6. a fiber failure checkout gear for EPON, is characterized in that, comprising: optical time domain reflectometer, optical splitter, wavelength division multiplexing filter plate, shunting coupler, multi-mode coupler and shunt router;
Described optical time domain reflectometer, detects light for the light path sending;
Described wavelength division multiplexing filter plate, after detecting optical coupling by the downlink business light from optical line terminal with from the light path of described optical time domain reflectometer, send into trunk optical fiber, and the uplink service light receiving and light path detection reflection of light light are separated, uplink service light is sent to described optical line terminal, light path is detected to reflection of light light and send to described optical time domain reflectometer;
Described shunting coupler, the light path sending for downlink business light that described optical line terminal is sent and described optical time domain reflectometer detects light and sends to described optical splitter, and the light path detection reflection of light light that sends of the uplink service light that described optical splitter is sent and described multi-mode coupler sends to described wavelength division multiplexing filter plate after being coupled;
Described multi-mode coupler, after being coupled, sends to described shunting coupler for the light path detection reflection of light light that described shunt router is sent;
Described optical splitter, send to described shunt router, and the uplink service light that described shunt router is sent sends to described shunting coupler for downlink business light and light path detection light that described shunting coupler is sent;
Described shunt router, send to described Optical Network Terminal for downlink business light and light path detection light that described optical splitter is sent, and the uplink service light that described Optical Network Terminal is sent sends to described optical splitter, also the light path sending from each branch optical fiber is detected to reflection of light light and send to described multi-mode coupler.
7. device according to claim 6, is characterized in that, described shunting coupler comprises: four interface optical circulators and wavelength division multiplexing filter plate;
Described four interface optical circulators, for the downlink business light that optical line terminal is sent, and the light path detection light that optical time domain reflectometer sends sends to described optical splitter, and the uplink service light that described optical splitter is sent sends to described wavelength division multiplexing filter plate, the uplink service light after the coupling of also described wavelength division multiplexing filter plate being sent and light path detect reflection of light light and send to described wavelength division multiplexing filter plate through described trunk optical fiber;
Described wavelength division multiplexing filter plate, the light path sending for uplink service light that described four interface optical circulators are sent and described multi-mode coupler detects after reflection of light light is coupled and sends to described four interface optical circulators.
8. device according to claim 6, is characterized in that, described shunt router comprises: four interface optical circulators and wavelength division multiplexing filter plate;
Described four interface optical circulators, send to described Optical Network Terminal for downlink business light and light path detection light that described optical splitter is sent, and the uplink service light that described Optical Network Terminal is sent and light path detect reflection of light light and send to described wavelength division multiplexing filter plate, the uplink service light also described wavelength division multiplexing filter plate being sent sends to described optical splitter;
Described wavelength division multiplexing filter plate, sends back to described four interface optical circulators again for the uplink service light that described four interface optical circulators are sent, and the light path that described four interface optical circulators are sent detection reflection of light light sends to described multi-mode coupler.
9. according to the device described in claim 6-8 any one, it is characterized in that, described shunting coupler comprises the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
Described the first optical circulator, for the downlink business light that optical line terminal is sent, and the light path that sends of optical time domain reflectometer detects light and send described the second optical circulator, and uplink service light after the coupling that described wavelength division multiplexing filter plate is sent and light path detect reflection of light light and send to described wavelength division multiplexing filter plate;
Described wavelength division multiplexing filter plate, the light path sending for uplink service light that described the second optical circulator is sent and described multi-mode coupler detects reflection of light light and is coupled, and the uplink service light after coupling and light path are detected to reflection of light light sends to described the first optical circulator;
Described the second optical circulator, for the downlink business light of reception and light path detection light are sent to described optical splitter, and the uplink service light that described optical splitter is sent sends to described wavelength division multiplexing filter plate.
10. according to the device described in claim 6-8 any one, it is characterized in that, described shunt router comprises: the first optical circulator, the second optical circulator and wavelength division multiplexing filter plate;
Described the first optical circulator, the downlink business light sending for described optical splitter and light path detect light and send to described the second optical circulator, and the uplink service light that described wavelength division multiplexing filter plate is sent sends to described optical splitter;
Described the second optical circulator, detect light for downlink business light that described the first optical circulator is sent and light path and send to described Optical Network Terminal through branch optical fiber, and described Optical Network Terminal is sent to uplink service light and light path and detect reflection of light light and send to described wavelength division multiplexing filter plate;
Described wavelength division multiplexing filter plate, sends to described the first optical circulator for the uplink service light that described the second optical circulator is sent, and the light path that described the second optical circulator is sent detection reflection of light light sends to described wavelength division multiplexing filter plate.
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