CN103973361B - The optical fiber fault detecting system of EPON and method - Google Patents
The optical fiber fault detecting system of EPON and method Download PDFInfo
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- CN103973361B CN103973361B CN201310028286.XA CN201310028286A CN103973361B CN 103973361 B CN103973361 B CN 103973361B CN 201310028286 A CN201310028286 A CN 201310028286A CN 103973361 B CN103973361 B CN 103973361B
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Abstract
The present invention relates to a kind of optical fiber fault detecting system and the method for EPON, this system includes OLT, OTDR instrument, WDM wave filter, beam splitter and some ONU, shunting coupler it is provided with between trunk optical fiber and beam splitter, being provided with branch router between branch optical fiber and beam splitter, each branch router is connected by multi-mode coupler with between shunting coupler.The present invention is by up-downgoing light separately, descending light walks original light path, detection light also walks the light path of whole process, and up light is in addition to original light path of branch optical fiber and trunk optical fiber, walk around beam splitter and walk the bypass of multi-mode coupler, greatly reduce the loss of its light path, the power budget making up light greatly lowers, improve the service life of ONU, reduce manufacturing cost, and the detection reflection light of branch optical fiber is owing to having walked around beam splitter, decreases loss, and can arrive on the OTDR instrument being positioned at OLT, it is achieved that the purpose of detection branches fiber failure at OLT.
Description
Technical field
The present invention relates to Optical Access Network technical field, particularly relate to the optical fiber fault detecting system of a kind of EPON
And method.
Background technology
Along with the fast development of Fibre Optical Communication Technology and cost degradation and the requirement of environmental protection, communication network is from core
Net, Metropolitan Area Network (MAN), to access network, all use optical fiber network consisting to have become as basic Consensus.
EPON (PON, Passive Optical Network) is used to have become as operator for access network
First-selected.EPON is the network of a kind of point-to-multipoint (P2MP, Point to Multipoint), the paving of substantial amounts of PON
If it runs and safeguards the problem having become as operator's overriding concern, in order to improve the efficiency of fault detect and lower into
This, operator is in the urgent need to realizing at office side OLT(optical line terminal, optical line terminal) place can detect whole
The fault of individual EPON.
Conventional OTDR(Optical Time Domain Reflectometer, optical time domain reflectometer) fiber failure inspection
Survey method is highly effective to the optical-fiber network of point-to-point (P2P, Point to Point), but directly it is transplanted to the passive of P2MP
On optical-fiber network, then having difficulties, its reason is ODN(optical distribution network, optical distribution network) in
Beam splitter be the optical device of a high loss, it every point once light just have the loss of 3 decibels, for a 1:2NLight splitting
Device, its active loss is usually about 3* (N+1) decibel, such as: the beam splitter of 1:32 its be typically lost at about 17.5 decibels.
And the method for the light path detection of OTDR is to launch detection light, detecting its reflection light, the precision of its detection depends on its dynamic range,
The power i.e. launching detection light deducts the power of the reflection light detected, and the measurement scope of most of OTDR instrument is at 40 to 45 points
Shellfish, and the EPON to 20 kilometers, its loss is generally 8 decibels, and reflects light and be typically detection light to the maximum
4%, i.e. 13 decibels, so for the reflection light of the EPON branch optical fiber that OTDR instrument can detect at OLT of 1:32
Power is that the power of detection light deducts (2*17.5+2*8+13), and i.e. its dynamic range is up to 64 decibels, and this is far beyond existing
The certainty of measurement of all OTDR instrument and scope.
In practice for 1:8 and above ODN EPON, the fault-signal of its branch optical fiber can not detect,
Common practice is used in the optical mode of the OTDR instrument at OLT or the OLT function with OTDR to detect trunk optical fiber, such as Fig. 1 institute
Showing, the detection light of OTDR is coupled into trunk optical fiber by WDM filter plate, and reflect light also by this light path along with detection light
Contrary direction enters on OTDR instrument, and the fault of branch optical fiber simply detects from user side OTDR instrument, and this is the most significantly
Add operator's O&M cost.Therefore, all fiber failures how detecting EPON at OLT are that operator compels
Be essential problem to be solved.
Summary of the invention
Present invention is primarily targeted at a kind of optical fiber fault detecting system and the method that EPON is provided, it is intended to real
Detect now the fault of all optical fiber particularly branch optical fiber of EPON at OLT.
In order to achieve the above object, the present invention proposes the optical fiber fault detecting system of a kind of EPON, including OLT,
OTDR instrument, WDM wave filter, beam splitter and some ONU, form trunk optical fiber between described WDM wave filter and beam splitter, described
Forming branch optical fiber between beam splitter and each ONU, described trunk optical fiber is provided with shunting coupler, and described branch optical fiber is provided with
Branch router, each branch router is connected by multi-mode coupler between described shunting coupler.
Preferably, described multi-mode coupler one end is multimode passage or the multimode fibre interface of multimode fibre formation, another
End is multiple single mode passages or multiple single-mode fiber stub interface of multiple single-mode fiber composition, middle logical by lens or coupling
Two ends are coupled by road；Described shunting coupler is connected with the multimode fibre interface of described multi-mode coupler, described branch router
It is connected with the single-mode fiber stub interface of described multi-mode coupler.
Preferably, described shunting coupler is the optical circulator of three interfaces, its first interface and multi-mode coupler
Multimode fibre interface is connected, and the second interface is connected with trunk optical fiber, and the 3rd interface is connected with the general-purpose interface of beam splitter.
Preferably, between the first interface and the multimode fibre interface of multi-mode coupler of described shunting coupler, it is provided with one
Lens, in the first interface that the optical coupling of multimode fibre interface is entered shunting coupler.
Preferably, described branch router is the optical circulator of three interfaces, its first interface and the branch of beam splitter
Interface is connected, and the second interface is connected with branch optical fiber, and its 3rd interface is connected with the single-mode fiber stub interface of multi-mode coupler.
Preferably, downlink business light and light path detection light send from OLT and OTDR instrument respectively, enter through WDM wave filter simultaneously
Entering trunk optical fiber, shunting coupler, beam splitter through ODN arrive each branch router the most successively, enter corresponding branch
Optical fiber arrives each ONU；
The reflection light of the up light sent from ONU and the light path detection light on each branch optical fiber is along branch optical fiber warp
Each road branch router enters multi-mode coupler, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, through master
Dry fiber-optic transfer is to WDM wave filter；If the optical module of OLT has a function of OTDR, then from WDM wave filter up light out and
The reflection light of light path detection light is all directed to OLT；Otherwise, being directed to OLT from WDM wave filter up light out, light path detects
The reflection light of light is directed to OTDR instrument.
The present invention also proposes the fiber failure detection method of a kind of EPON, including:
Downlink business light and light path detection light send from OLT and OTDR instrument respectively, simultaneously enter trunk light through WDM wave filter
Fibre, shunting coupler, beam splitter through ODN arrive each branch router the most successively, enter corresponding branch optical fiber and arrive
Each ONU；
The reflection light of the up light sent from ONU and the light path detection light on each branch optical fiber is along branch optical fiber warp
Each road branch router enters multi-mode coupler, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, through master
Dry fiber-optic transfer is to WDM wave filter；If the optical module of OLT has a function of OTDR, then from WDM wave filter up light out and
The reflection light of light path detection light is all directed to OLT；Otherwise, being directed to OLT from WDM wave filter up light out, light path detects
The reflection light of light is directed to OTDR instrument.
Preferably, described downlink business light and light path detection light send from OLT and OTDR instrument respectively, same through WDM wave filter
Time enter trunk optical fiber, arrive each branch router through the shunting coupler of ODN, beam splitter the most successively, enter corresponding
Branch optical fiber arrives the step of each ONU and includes:
Downlink business light and light path detection light send from OLT and OTDR instrument respectively, simultaneously enter trunk light through WDM wave filter
Fine the second interface arriving the shunting coupler being positioned at ODN, the 3rd interface going out shunting coupler enters beam splitter, goes out beam splitter
The first interface of rear arrival each branch router, the second interface going out branch router enters corresponding branch optical fiber, finally
Each ONU is arrived through branch optical fiber.
Preferably, if the optical module of OLT does not have a function of OTDR, then the described up light sent from ONU and often
The reflection light of the light path detection light on individual branch optical fiber enters multi-mode coupler along branch optical fiber through each road branch router, through many
Mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, through trunk optical fiber transmission to after WDM wave filter, up light is led
To OLT, the reflection light of light path detection light is directed to the step of OTDR instrument and includes:
The reflection light of the up light that sends from ONU and the detection light of the light path on each branch optical fiber along branch optical fiber to
Reaching the second interface of branch router, the single-mode fiber branch of the 3rd interface entrance multi-mode coupler going out branch router connects
Mouthful, after multi-mode coupler couples, go out its multimode fibre interface arrive the first interface of shunting coupler, go out shunting coupler
Second interface enters trunk optical fiber, arrives on WDM wave filter after trunk optical fiber transmits, and the most up light is directed to OLT, detection
Reflection light is directed to OTDR instrument.
Preferably, if the optical module of OLT has a function of OTDR, then the described up light sent from ONU and each
The reflection light of the light path detection light on branch optical fiber enters multi-mode coupler along branch optical fiber through each road branch router, through multimode
Bonder be coupled to shunting coupler laggard enter trunk optical fiber, through trunk optical fiber transmission to after WDM wave filter, up light is directed to
OLT, the reflection light of light path detection light is directed to the step of OTDR instrument and includes:
The reflection light of the up light that sends from ONU and the detection light of the light path on each branch optical fiber along branch optical fiber to
Reaching the second interface of branch router, the single-mode fiber branch of the 3rd interface entrance multi-mode coupler going out branch router connects
Mouthful, after multi-mode coupler couples, go out its multimode fibre interface arrive the first interface of shunting coupler, go out shunting coupler
Second interface enters trunk optical fiber, arrives on WDM wave filter after trunk optical fiber transmits, and the most up light and detection reflection light are equal
It is directed to OLT.
The optical fiber fault detecting system of a kind of EPON that the present invention proposes and method, by setting on trunk optical fiber
Put shunting coupler, branch optical fiber arranges branch router, between each branch router and shunting coupler, passes through multimode
Bonder connects, and thus by up-downgoing light separately, descending light walks original light path, and detection light also walks the light path of whole process, and up
Light, in addition to original light path of branch optical fiber and trunk optical fiber, is walked around beam splitter and is walked the bypass of multi-mode coupler, greatly reduce it
The loss of light path so that the power budget of up light greatly lowers, improves the service life of ONU, and reduces manufacturing cost,
And the detection of branch optical fiber reflection light is owing to having walked around beam splitter, decreases loss so that it can arrive at and be positioned at OLT
On OTDR instrument, it is achieved thereby that the purpose of detection branches fiber failure at OLT.
Accompanying drawing explanation
Fig. 1 is the structural representation that existing OTDR carries out the EPON of light path detection；
Fig. 2 is the structural representation of optical fiber fault detecting system one embodiment of EPON of the present invention；
Fig. 3 be EPON of the present invention optical fiber fault detecting system one embodiment in the structure of multi-mode coupler show
It is intended to；
Fig. 4 be EPON of the present invention optical fiber fault detecting system one embodiment in the structural representation of shunting coupler
Figure；
Fig. 5 be EPON of the present invention optical fiber fault detecting system one embodiment in the structural representation of branch router
Figure；
Fig. 6 is the schematic flow sheet of fiber failure detection method one embodiment of EPON of the present invention.
In order to make technical scheme clearer, clear, it is described in further detail below in conjunction with accompanying drawing.
Detailed description of the invention
The solution of the embodiment of the present invention is mainly: arrange shunting coupler on trunk optical fiber, on branch optical fiber
Branch router is set, is connected by multi-mode coupler between each branch router and shunting coupler, thus by up-downgoing light
Separately, descending light walks original light path, and detection light also walks the light path of whole process, and up light is except branch optical fiber and trunk optical fiber
Outside original light path, walk around beam splitter and walk the bypass of multi-mode coupler, greatly reduce the loss of its light path so that the power of up light
Budget is greatly lowered, to improve ONU(Optical Network Unit, optical network unit) service life, reduction is manufactured into
This, and the detection of branch optical fiber reflection light is owing to having walked around beam splitter, decreases loss so that it can arrive at and be positioned at OLT
On the OTDR instrument at place, it is achieved thereby that the purpose of detection branches fiber failure at OLT.
As in figure 2 it is shown, one embodiment of the invention proposes the optical fiber fault detecting system of a kind of EPON, including
OLT101, OTDR instrument 102, WDM(Wavelength Division Multiplexing, wavelength-division multiplex) wave filter 103, light splitting
Device 104 and some ONU105, OLT101, OTDR instrument 102 is connected with WDM wave filter 103 respectively, and WDM wave filter 103 passes through light
Fibre is connected with beam splitter 104, and beam splitter 104 is connected with each ONU105 by optical fiber, described WDM wave filter 103 and beam splitter 104
Between formed trunk optical fiber, between described beam splitter 104 and each ONU105 formed branch optical fiber, the present embodiment is original passive
Several light guide module is added, specifically on trunk optical fiber and between beam splitter 104 at the beam splitter 104 of the ODN in optical-fiber network
Having additional shunting coupler 106, its effect is required light to be carried out branch and coupling, with beam splitter on branch optical fiber
Having additional branch router 107 between 104, its Main Function is also that the light entering branch optical fiber is carried out branch and coupling, with
Time between shunting coupler 106 with branch router 107, be connected a multi-mode coupler 108, the most each branch router 107 with
Being connected by multi-mode coupler 108 between described shunting coupler 106, the Main Function of multi-mode coupler 108 is at beam splitter
A branch bypass is built on 104 sides so that light in need can walk around the beam splitter 104 of high loss, and walks low-loss many
Mode coupler 108.
Specifically, shown in Fig. 3, described multi-mode coupler 108 one end is multimode passage or multimode fibre 1081 is formed
Multimode fibre interface, the other end be multiple single mode passage or multiple single-mode fiber 1082 composition multiple single-mode fiber branches connect
Mouthful, two ends are coupled by middle lens 1083 or the coupling channel of passing through；Described shunting coupler 106 and described multi-mode coupler 108
Multimode fibre interface be connected, the single-mode fiber stub interface phase of described branch router 107 and described multi-mode coupler 108
Even.In the present embodiment, the light path of the single mode passage of main application multi-mode coupler 108 to multimode passage, according to prior art
The loss of the light path only one of which decibel of the direction, therefore can meet this bypass is low-loss demand.
Shown in Fig. 4, described shunting coupler 106 is the optical circulator of three interfaces, and its first interface is (in figure
Shown in 1) it is connected with the multimode fibre interface of multi-mode coupler 108, the second interface (as shown in Figure 2) is connected with trunk optical fiber,
3rd interface (as shown in Figure 3) is connected with the general-purpose interface of beam splitter 104.Owing to the hot spot of multimode fibre is bigger, need
One lens between the first interface and the multimode fibre interface of multi-mode coupler 108 of shunting coupler 106, adjust them it
Between distance so that the luminous energy overwhelming majority come in from first interface goes out the second interface and enters trunk optical fiber, to reduce up light
The total losses detoured.
Shown in Fig. 5, described branch router 107 is the optical circulator of three interfaces, and its first interface is (in figure
Shown in 1) it is connected with the stub interface of beam splitter 104, the second interface (as shown in Figure 2) is connected with branch optical fiber, and it the 3rd connects
Mouth (as shown in Figure 3) is connected with the single-mode fiber stub interface of multi-mode coupler 108.
The ultimate principle of the fiber failure detection that the present embodiment carries out EPON is as follows:
First the downlink business light sent from OLT101 and the light path sent from OTDR instrument 102 detect light simultaneously through trunk
Optical fiber arrives the second interface of the shunting coupler 106 being positioned at ODN, goes out the 3rd interface and enters beam splitter 104, goes out beam splitter 104
The first interface of rear arrival each branch router 107, the second interface going out branch router 107 enters corresponding branch light
Fibre, after arrive on each ONU105 through branch optical fiber.
And the reflection light of the up light sent from ONU105 and the detection light of the light path on each branch optical fiber is along branch
Optical fiber arrives the second interface of branch router 107, and the 3rd interface going out branch router 107 enters multi-mode coupler 108
Single-mode fiber stub interface, goes out its multimode fibre interface after multi-mode coupler 108 couples and arrives the first of shunting coupler 106
Interface, the second interface going out shunting coupler 106 enters trunk optical fiber, arrives WDM wave filter 103 after trunk optical fiber transmits
On, the most up light is directed to OLT101, and detects reflection light and be directed on OTDR instrument 102, if the optical module tool of OLT101
There is the function of OTDR, then all of up light directly arrives on OLT101 through optical module, OLT101 directly enter these light
Row processes.
The present embodiment passes through such scheme, sets up shunting coupler 106 on trunk optical fiber and between beam splitter 104,
Branch router 107 is set up, between each branch router 107 and shunting coupler 106 on branch optical fiber and between beam splitter 104
Being connected by multi-mode coupler 108, wherein, shunting coupler 106 and branch router 107 select optical circulator, by
Up-downgoing light is separated by this, and descending light walks original light path, and wherein detection light also walks the light path of whole process, and up light is except branch
Outside original light path of optical fiber and trunk optical fiber, walk around beam splitter 104 and walk the bypass of multi-mode coupler 108, thus greatly reduce it
The loss of light path so that the power budget of up light greatly lowers, improves the service life of ONU105, and reduces and be manufactured into
This, also comply with the energy-conserving and environment-protective theory of modern, and the detection of branch optical fiber reflection light be owing to having walked around beam splitter 104, subtracts
Lack loss so that detection reflection luminous energy arrives on the OTDR instrument 102 being positioned at OLT101, it is achieved that detection point at OLT101
Prop up the purpose of fiber failure.
As shown in Figure 6, one embodiment of the invention proposes the fiber failure detection method of a kind of EPON, based on above-mentioned
The optical fiber fault detecting system of EPON and implement, the method includes:
Step S201, downlink business light and light path detection light send to enter through WDM wave filter from OLT and OTDR instrument respectively simultaneously
Entering trunk optical fiber, shunting coupler, beam splitter through ODN arrive each branch router the most successively, enter corresponding branch
Optical fiber arrives each ONU；
Step S202, the up light sent from ONU and the reflection light edge of the detection light of the light path on each branch optical fiber
Branch optical fiber through each road branch router enter multi-mode coupler, through multi-mode coupler be coupled into shunting coupler laggard enter trunk
Optical fiber, transmits to WDM wave filter through trunk optical fiber；If the optical module of OLT has the function of OTDR, then from WDM wave filter out
Up light and light path detection light reflection light be all directed to OLT；Otherwise, it is directed to from WDM wave filter up light out
OLT, the reflection light of light path detection light is directed to OTDR instrument.
Specifically, the ultimate principle of the fiber failure detection that the present embodiment carries out EPON is as follows:
First the downlink business light that sends from OLT and the light path detection light that sends from OTDR instrument simultaneously through trunk optical fiber to
Reach the second interface of the shunting coupler being positioned at ODN, go out the 3rd interface and enter beam splitter, after going out beam splitter, arrive each branch road
By the first interface of device, the second interface going out branch router enters corresponding branch optical fiber, after arrive through branch optical fiber every
On individual ONU.
And the reflection light of the up light sent from ONU and the detection light of the light path on each branch optical fiber is along branch optical fiber
Arriving the second interface of branch router, the single-mode fiber branch of the 3rd interface entrance multi-mode coupler going out branch router connects
Mouthful, after multi-mode coupler couples, go out its multimode fibre interface arrive the first interface of shunting coupler, go out shunting coupler
Second interface enters trunk optical fiber, arrives on WDM wave filter, if the optical module of OLT does not have OTDR after trunk optical fiber transmits
Function, the most up light is directed to OLT, and detects reflection light and be directed on OTDR instrument, if the optical module of OLT has OTDR's
Function, then all directly arrive OLT through optical module from WDM wave filter up light out and detection reflection light, direct by OLT
These light are processed.
The present embodiment passes through such scheme, sets up shunting coupler, at branch's light on trunk optical fiber and between beam splitter
Set up branch router, on fibre and between beam splitter between each branch router and shunting coupler by multi-mode coupler even
Connecing, wherein, shunting coupler and branch router select optical circulator, and thus by up-downgoing light separately, descending light is walked
Light path originally, wherein detection light also walks the light path of whole process, and up light is except branch optical fiber and original light path of trunk optical fiber
Outward, walk around beam splitter and walk the bypass of multi-mode coupler, thus greatly reduce the loss of its light path so that the power budget of up light
Greatly lower, improve the service life of ONU, and reduce manufacturing cost, also comply with the energy-conserving and environment-protective theory of modern, and
The detection reflection light of branch optical fiber, owing to having walked around beam splitter, decreases loss so that detection reflection luminous energy arrives at and is positioned at OLT
OTDR instrument on, it is achieved that the purpose of detection branches fiber failure at OLT.
The foregoing is only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilization
Equivalent structure or flow process that description of the invention and accompanying drawing content are made convert, or are directly or indirectly used in other relevant skill
Art field, is the most in like manner included in the scope of patent protection of the present invention.
Claims (9)
1. an optical fiber fault detecting system for EPON, including optical line terminal OLT, optical time domain reflectometer OTDR instrument,
Wave division multiplexing WDM wave filter, beam splitter and some optical network unit ONU, formed main between described WDM wave filter and beam splitter
Dry optical fiber, forms branch optical fiber, it is characterised in that described trunk optical fiber is provided with branch coupling between described beam splitter and each ONU
Clutch, described branch optical fiber is provided with branch router, by multimode coupling between each branch router and described shunting coupler
Clutch connects；
Wherein, downlink business light and light path detection light send from OLT and OTDR instrument respectively, simultaneously enter trunk through WDM wave filter
Optical fiber, shunting coupler, beam splitter through ODN arrive each branch router the most successively, enter corresponding branch optical fiber and arrive
Reach each ONU；
The up light sent from ONU and the light path on each branch optical fiber detect the reflection light of light along branch optical fiber through each road
Branch router enter multi-mode coupler, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, through trunk light
Fine transmission is to WDM wave filter；If the optical module of OLT has a function of OTDR, then from WDM wave filter up light out and light path
The reflection light of detection light is all directed to OLT；Otherwise, it is directed to OLT from WDM wave filter up light out, light path detection light
Reflection light is directed to OTDR instrument.
System the most according to claim 1, it is characterised in that described multi-mode coupler one end is multimode passage or multimode light
The fine multimode fibre interface formed, the other end is multiple single mode passage or multiple single-mode fiber branches of multiple single-mode fiber composition
Interface, two ends are coupled by middle lens or the coupling channel of passing through；Described shunting coupler and the multimode light of described multi-mode coupler
Fine interface is connected, and described branch router is connected with the single-mode fiber stub interface of described multi-mode coupler.
System the most according to claim 2, it is characterised in that described shunting coupler is that the light of three interfaces goes in ring
Device, its first interface is connected with the multimode fibre interface of multi-mode coupler, and the second interface is connected with trunk optical fiber, the 3rd interface with
The general-purpose interface of beam splitter is connected.
System the most according to claim 3, it is characterised in that at first interface and the Multiple modes coupling of described shunting coupler
It is provided with lens between the multimode fibre interface of device, connects for the optical coupling of multimode fibre interface is entered the first of shunting coupler
In Kou.
5. according to the system described in claim 2,3 or 4, it is characterised in that described branch router is the light of three interfaces
Circulator, its first interface is connected with the stub interface of beam splitter, and the second interface is connected with branch optical fiber, and its 3rd interface is with many
The single-mode fiber stub interface of mode coupler is connected.
6. the fiber failure detection method of an EPON, it is characterised in that including:
Downlink business light and light path detection light send from OLT and OTDR instrument respectively, simultaneously enter trunk optical fiber through WDM wave filter,
Shunting coupler, beam splitter through ODN arrive each branch router the most successively, enter corresponding branch optical fiber and arrive each
ONU；
The up light sent from ONU and the light path on each branch optical fiber detect the reflection light of light along branch optical fiber through each road
Branch router enter multi-mode coupler, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, through trunk light
Fine transmission is to WDM wave filter；If the optical module of OLT has a function of OTDR, then from WDM wave filter up light out and light path
The reflection light of detection light is all directed to OLT；Otherwise, it is directed to OLT from WDM wave filter up light out, light path detection light
Reflection light is directed to OTDR instrument.
Method the most according to claim 6, it is characterised in that described downlink business light and light path detection light are respectively from OLT
Sending with OTDR instrument, simultaneously enter trunk optical fiber through WDM wave filter, shunting coupler, beam splitter through ODN arrive the most successively
Each branch router, the step entering the corresponding branch optical fiber each ONU of arrival includes:
Downlink business light and light path detection light send from OLT and OTDR instrument respectively, simultaneously enter trunk optical fiber through WDM wave filter and arrive
Reaching the second interface of the shunting coupler being positioned at ODN, the 3rd interface going out shunting coupler enters beam splitter, arrives after going out beam splitter
Reach the first interface of each branch router, go out the second interface of branch router and enter corresponding branch optical fiber, after through point
Prop up optical fiber and arrive each ONU.
Method the most according to claim 7, it is characterised in that if the optical module of OLT does not have the function of OTDR, then described
The up light sent from ONU and the light path on each branch optical fiber detect the reflection light of light along branch optical fiber through each road branch
Router enter multi-mode coupler, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, through trunk optical fiber pass
After transporting to WDM wave filter, up light is directed to OLT, and the reflection light of light path detection light is directed to the step of OTDR instrument and includes:
The reflection light of the up light sent from ONU and the light path detection light on each branch optical fiber arrives along branch optical fiber and divides
Second interface of road router, the 3rd interface going out branch router enters the single-mode fiber stub interface of multi-mode coupler, warp
Go out its multimode fibre interface after multi-mode coupler coupling and arrive the first interface of shunting coupler, go out the second of shunting coupler and connect
Mouth enters trunk optical fiber, arrives on WDM wave filter after trunk optical fiber transmits, and the most up light is directed to OLT, and light is reflected in detection
It is directed to OTDR instrument.
Method the most according to claim 7, it is characterised in that if the optical module of OLT has a function of OTDR, then described from
The up light that ONU sends and the light path on each branch optical fiber detect the reflection light of light along branch optical fiber through branch road, each road
Entered multi-mode coupler by device, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, through trunk optical fiber transmit
To WDM wave filter, up light is directed to OLT, and the reflection light of light path detection light is directed to the step of OTDR instrument and includes:
The reflection light of the up light sent from ONU and the light path detection light on each branch optical fiber arrives along branch optical fiber and divides
Second interface of road router, the 3rd interface going out branch router enters the single-mode fiber stub interface of multi-mode coupler, warp
Go out its multimode fibre interface after multi-mode coupler coupling and arrive the first interface of shunting coupler, go out the second of shunting coupler and connect
Mouth enters trunk optical fiber, arrives on WDM wave filter after trunk optical fiber transmits, and the most up light is all directed to detecting reflection light
OLT。
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