CN103973361A - Optical fiber fault detection system and method for passive optical network - Google Patents
Optical fiber fault detection system and method for passive optical network Download PDFInfo
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- CN103973361A CN103973361A CN201310028286.XA CN201310028286A CN103973361A CN 103973361 A CN103973361 A CN 103973361A CN 201310028286 A CN201310028286 A CN 201310028286A CN 103973361 A CN103973361 A CN 103973361A
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Abstract
The invention relates to an optical fiber fault detection system and method for a passive optical network. The system comprises an OLT, an OTDR, a WDM filter, an optical splitter and a plurality of ONUs. A shunting coupler is arranged between a main optical fiber and the optical splitter, and shunting routers are arranged between auxiliary optical fibers and the optical splitter and are connected with the shunting coupler through a multimode coupler. According to the optical fiber fault detection system, uplink light and downlink light are separated, the downlink light passes through an original light path, detection light passes through the whole light path, the uplink light passes through original light paths of the auxiliary optical fibers and an original light path of the main optical fiber and bypasses the optical splitter to pass through a bypass of the multimode coupler, so that loss of the light paths of the uplink light is greatly reduced, the power budget of the uplink light is greatly reduced, the service life of the ONUs is prolonged, and the manufacturing cost is lowered. The reflected detection light of the auxiliary optical fibers bypasses the optical splitter so as to reduce loss and can reach the OTDR arranged at the OLT, and therefore the purpose of detecting faults of the auxiliary optical fibers at the OLT can be achieved.
Description
Technical field
The present invention relates to Optical Access Network technical field, relate in particular to a kind of optical fiber fault detecting system and method for EPON.
Background technology
Along with the fast development of Fibre Optical Communication Technology and the requirement of cost degradation and environmental protection, communication network, from core net, metropolitan area network to Access Network, all uses optical fiber network consisting to become basic Consensus.
Adopt EPON (PON, Passive Optical Network) to become the first-selection of operator for Access Network.EPON is a kind of point-to-multipoint (P2MP, Point to Multipoint) network, the laying of a large amount of PON, its operation and maintenance has become the problem of operator's overriding concern, in order to improve the efficiency of fault detect and to reduce the cost, operator is in the urgent need to realizing at office side OLT(optical line terminal, optical line terminal) locate to detect the fault of whole EPON.
Conventional OTDR(Optical Time Domain Reflectometer, optical time domain reflectometer) fiber failure detection method is to point-to-point (P2P, Point to Point) optical-fiber network very effective, but directly it is transplanted on the EPON of P2MP, have difficulties, its reason is ODN(optical distribution network, optical distribution network) in optical splitter be 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 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, the measuring range of most of OTDR instrument is at 40 to 45 decibels, and to the EPON of 20 kilometers, its loss is generally 8 decibels, and reverberation is generally 4% of detection light to the maximum, 13 decibels, the reflected optical power of the branch optical fiber that can detect at the OTDR of OLT place instrument 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 certainty of measurement far beyond existing all OTDR instrument and scope.
In fact for 1:8 and above ODN EPON, the fault-signal of its branch optical fiber can not detect, common way is to be used in the OTDR instrument at OLT place or the optical mode of OLT detects trunk optical fiber with the function of OTDR, as shown in Figure 1, the detection light of OTDR is coupled into trunk optical fiber by WDM filter plate, and reverberation also enters on OTDR instrument along the direction contrary with detecting light by this light path, and the fault of branch optical fiber just detects with OTDR instrument from user's side, this has just increased operator's O&M cost greatly.Therefore all fiber failures that, how to detect EPON at OLT place are operator's problems in the urgent need to address.
Summary of the invention
Main purpose of the present invention is to provide a kind of optical fiber fault detecting system and method for EPON, is intended to realize the particularly fault of branch optical fiber of all optical fiber that detects EPON at OLT place.
In order to achieve the above object, the present invention proposes a kind of optical fiber fault detecting system of EPON, comprise OLT, OTDR instrument, WDM filter, optical splitter and some ONU, between described WDM filter and optical splitter, form trunk optical fiber, between described optical splitter and each ONU, form branch optical fiber, described trunk optical fiber is provided with shunting coupler, and described branch optical fiber is provided with router along separate routes, between each router along separate routes and described shunting coupler, is connected by multi-mode coupler.
Preferably, described multi-mode coupler one end is the multimode fiber interface that multimode passage or multimode fiber form, and the other end is that multiple monomode fibers of multiple single mode passages or multiple monomode fiber composition divide support interface, and middle scioptics or coupling channel are coupled two ends; Described shunting coupler is connected with the multimode fiber interface of described multi-mode coupler, and described shunt router divides support interface to be connected with the monomode fiber of described multi-mode coupler.
Preferably, described shunting coupler is the optical circulator of three interfaces, and its first interface is connected with the multimode fiber interface of multi-mode coupler, and the second interface is connected with trunk optical fiber, and the 3rd interface is connected with the general-purpose interface of optical splitter.
Preferably, between the first interface of described shunting coupler and the multimode fiber interface of multi-mode coupler, be provided with lens, for the optical coupling of multimode fiber interface being entered to the first interface of shunting coupler.
Preferably, described shunt router is the optical circulator of three interfaces, and its first interface is connected with a point support interface for optical splitter, and the second interface is connected with branch optical fiber, and its 3rd interface divides support interface to be connected with the monomode fiber of multi-mode coupler.
Preferably, downlink business light and light path detect light and send from OLT and OTDR instrument respectively, enter trunk optical fiber through WDM filter simultaneously, arrive each shunt router through shunting coupler, the optical splitter of ODN successively afterwards, enter corresponding branch optical fiber and arrive each ONU;
The up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and enter multi-mode coupler along branch optical fiber Jing Ge road shunt router, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, transfer to WDM filter through trunk optical fiber; If the optical module of OLT has the function of OTDR, be all directed to OLT from WDM filter up light and light path detection reflection of light light out; Otherwise, being directed to OLT from WDM filter up light out, light path detects reflection of light light and is directed to OTDR instrument.
The present invention also proposes a kind of fiber failure detection method of EPON, comprising:
Downlink business light and light path detect light and send from OLT and OTDR instrument respectively, enter trunk optical fiber through WDM filter simultaneously, arrive each shunt router successively afterwards through shunting coupler, the optical splitter of ODN, enter corresponding branch optical fiber and arrive each ONU;
The up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and enter multi-mode coupler along branch optical fiber Jing Ge road shunt router, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, transfer to WDM filter through trunk optical fiber; If the optical module of OLT has the function of OTDR, be all directed to OLT from WDM filter up light and light path detection reflection of light light out; Otherwise, being directed to OLT from WDM filter up light out, light path detects reflection of light light and is directed to OTDR instrument.
Preferably, described downlink business light and light path detect light and send from OLT and OTDR instrument respectively, enter trunk optical fiber through WDM filter simultaneously, arrive each shunt router through shunting coupler, the optical splitter of ODN successively afterwards, enter the step that corresponding branch optical fiber arrives each ONU and comprise:
Downlink business light and light path detect light and send from OLT and OTDR instrument respectively, enter trunk optical fiber through WDM filter simultaneously and arrive the second interface of shunting coupler that is positioned at ODN, the 3rd interface that goes out shunting coupler enters optical splitter, go out the first interface that arrives each shunt router after optical splitter, go out the second interface of router along separate routes and enter corresponding branch optical fiber, arrive each ONU finally by branch optical fiber.
Preferably, if the optical module of OLT does not have the function of OTDR, the described up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and enter multi-mode coupler along branch optical fiber Jing Ge road shunt router, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, after trunk optical fiber transfers to WDM filter, up light is directed to OLT, and the step that light path detection reflection of light light is directed to OTDR instrument comprises:
The up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and arrive the second interface of router along separate routes along branch optical fiber, go out the monomode fiber that the 3rd interface of router along separate routes enters multi-mode coupler and divide support interface, after multi-mode coupler coupling, go out the first interface of its multimode fiber interface arrival shunting coupler, the second interface that goes out shunting coupler enters trunk optical fiber, after trunk optical fiber transmission, arrive on WDM filter, then up light is directed to OLT, and detection of reflected light is directed to OTDR instrument.
Preferably, if the optical module of OLT has the function of OTDR, the described up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and enter multi-mode coupler along branch optical fiber Jing Ge road shunt router, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, after trunk optical fiber transfers to WDM filter, up light is directed to OLT, and the step that light path detection reflection of light light is directed to OTDR instrument comprises:
The up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and arrive the second interface of router along separate routes along branch optical fiber, go out the monomode fiber that the 3rd interface of router along separate routes enters multi-mode coupler and divide support interface, after multi-mode coupler coupling, go out the first interface of its multimode fiber interface arrival shunting coupler, the second interface that goes out shunting coupler enters trunk optical fiber, after trunk optical fiber transmission, arrive on WDM filter, then up light and detection of reflected light are all directed to OLT.
Optical fiber fault detecting system and the method for a kind of EPON that the present invention proposes, by shunting coupler is set on trunk optical fiber, router is along separate routes set on branch optical fiber, between each router along separate routes and shunting coupler, be connected by multi-mode coupler, thus by up-downgoing light separately, descending light is walked original light path, detect light and also walk omnidistance light path, and up light is except original light path of branch optical fiber and trunk optical fiber, walk around optical splitter and walk the bypass of multi-mode coupler, greatly reduce the loss of its light path, the power budget of up light is greatly lowered, improve the useful life of ONU, and reduce manufacturing cost, and the detection of reflected light of branch optical fiber is owing to having walked around optical splitter, also reduced loss, it can be arrived on the OTDR instrument that is positioned at OLT place, thereby realize the object at OLT place detection branches fiber failure.
Brief description of the drawings
Fig. 1 is the existing structural representation that carries out the EPON of light path detection with OTDR;
Fig. 2 is the structural representation of optical fiber fault detecting system one embodiment of EPON of the present invention;
Fig. 3 is the structural representation of multi-mode coupler in optical fiber fault detecting system one embodiment of EPON of the present invention;
Fig. 4 is the structural representation of shunting coupler in optical fiber fault detecting system one embodiment of EPON of the present invention;
Fig. 5 is the structural representation of router along separate routes in optical fiber fault detecting system one embodiment of EPON of the present invention;
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 of the present invention clearer, clear, be described in further detail below in conjunction with accompanying drawing.
Embodiment
The solution of the embodiment of the present invention is mainly: shunting coupler is set on trunk optical fiber, router is along separate routes set on branch optical fiber, between each router along separate routes and shunting coupler, be connected by multi-mode coupler, thus by up-downgoing light separately, descending light is walked original light path, detect light and also walk omnidistance light path, and up light is except original light path of branch optical fiber and trunk optical fiber, walk around optical splitter and walk the bypass of multi-mode coupler, greatly reduce the loss of its light path, the power budget of up light is greatly lowered, to improve ONU(Optical Network Unit, optical network unit) useful life, reduce manufacturing cost, and the detection of reflected light of branch optical fiber is owing to having walked around optical splitter, also reduced loss, it can be arrived on the OTDR instrument that is positioned at OLT place, thereby realize the object at OLT place detection branches fiber failure.
As shown in Figure 2, one embodiment of the invention proposes a kind of optical fiber fault detecting system of EPON, comprise OLT101, OTDR instrument 102, WDM(Wavelength Division Multiplexing, wavelength division multiplexing) filter 103, optical splitter 104 and some ONU105, OLT101, OTDR instrument 102 is connected with WDM filter 103 respectively, WDM filter 103 is connected with optical splitter 104 by optical fiber, optical splitter 104 is connected with each ONU105 by optical fiber, between described WDM filter 103 and optical splitter 104, form trunk optical fiber, between described optical splitter 104 and each ONU105, form branch optical fiber, optical splitter 104 places of the ODN of the present embodiment in original EPON have increased several light guide modules, specifically on trunk optical fiber and between optical splitter 104, have additional shunting coupler 106, its effect is that needed light is carried out to shunt and coupling, on branch optical fiber and between optical splitter 104, have additional router one 07 along separate routes, its Main Function is also that the light to entering branch optical fiber carries out shunt and coupling, between shunting coupler 106 and shunt router one 07, be connected a multi-mode coupler 108 simultaneously, be to be connected by multi-mode coupler 108 between each shunt router one 07 and described shunting coupler 106, the Main Function of multi-mode coupler 108 is to build branch's bypass on optical splitter 104 sides, make the light needing can walk around the optical splitter 104 of high loss, and walk low-loss multi-mode coupler 108.
Particularly, shown in Fig. 3, described multi-mode coupler 108 one end are the multimode fiber interface that multimode passage or multimode fiber 1081 form, the other end is that multiple monomode fibers that multiple single mode passages or multiple monomode fiber 1082 form divide support interface, and middle scioptics 1083 or coupling channel are coupled two ends; Described shunting coupler 106 is connected with the multimode fiber interface of described multi-mode coupler 108, and described shunt router one 07 divides support interface to be connected with the monomode fiber of described multi-mode coupler 108.In the present embodiment, mainly apply the single mode passage of multi-mode coupler 108 to the light path of multimode passage, only have the loss of a decibel according to the light path of this direction of prior art, therefore can meet this bypass is low-loss demand.
Shown in Fig. 4, described shunting coupler 106 is the optical circulator of three interfaces, its first interface (as shown in Figure 1) is connected with the multimode fiber interface of multi-mode coupler 108, the second interface (as shown in Figure 2) is connected with trunk optical fiber, and the 3rd interface (as shown in Figure 3) is connected with the general-purpose interface of optical splitter 104.Because the hot spot of multimode fiber is larger, need lens between the first interface of shunting coupler 106 and the multimode fiber interface of multi-mode coupler 108, adjust the distance between them, the luminous energy overwhelming majority that makes to come in from first interface goes out the second interface and enters trunk optical fiber, the total losses that detour to reduce up light.
Shown in Fig. 5, described shunt router one 07 is the optical circulator of three interfaces, its first interface (as shown in Figure 1) is connected with a point support interface for optical splitter 104, the second interface (as shown in Figure 2) is connected with branch optical fiber, and its 3rd interface (as shown in Figure 3) divides support interface to be connected with the monomode fiber of multi-mode coupler 108.
The present embodiment carry out EPON fiber failure detect general principle as follows:
First the downlink business light sending from OLT101 and the light path sending from OTDR instrument 102 detect the light while arrives the shunting coupler 106 that is positioned at ODN the second interface through trunk optical fiber, go out the 3rd interface and enter optical splitter 104, go out the first interface of the each shunt router one 07 of the rear arrival of optical splitter 104, go out the second interface of router one 07 along separate routes and enter corresponding branch optical fiber, arrive on each ONU105 finally by branch optical fiber.
And the up light sending from ONU105 and the light path on each branch optical fiber detect reflection of light light along branch optical fiber arrival the second interface of router one 07 along separate routes, go out the monomode fiber that the 3rd interface of router one 07 along separate routes enters multi-mode coupler 108 and divide support interface, after multi-mode coupler 108 couplings, go out the first interface of its multimode fiber interface arrival shunting coupler 106, the second interface that goes out shunting coupler 106 enters trunk optical fiber, after trunk optical fiber transmission, arrive on WDM filter 103, then up light is directed to OLT101, and detection of reflected light is directed on OTDR instrument 102, if the optical module of OLT101 has the function of OTDR, so all up light directly arrive on OLT101 through optical module, directly these light are processed by OLT101.
The present embodiment passes through such scheme, on trunk optical fiber and between optical splitter 104, set up shunting coupler 106, on branch optical fiber and between optical splitter 104, set up router one 07 along separate routes, between each router one 07 along separate routes and shunting coupler 106, be connected by multi-mode coupler 108, wherein, shunting coupler 106 and along separate routes router one 07 selective light circulator, thus by up-downgoing light separately, descending light is walked original light path, wherein detect light and also walk omnidistance light path, and up light is except original light path of branch optical fiber and trunk optical fiber, walk around optical splitter 104 and walk the bypass of multi-mode coupler 108, thereby greatly reduce the loss of its light path, the power budget of up light is greatly lowered, improve the useful life of ONU105, and reduce manufacturing cost, also meet modern's energy-conserving and environment-protective theory, and the detection of reflected light of branch optical fiber is owing to having walked around optical splitter 104, reduce loss, detection of reflected luminous energy is arrived at and be positioned on the OTDR instrument 102 at OLT101 place, realize the object at OLT101 place detection branches fiber failure.
As shown in Figure 6, one embodiment of the invention proposes a kind of fiber failure detection method of EPON, the optical fiber fault detecting system based on above-mentioned EPON and implementing, and the method comprises:
Step S201, downlink business light and light path detect light and send through WDM filter and enter trunk optical fiber simultaneously from OLT and OTDR instrument respectively, arrive each shunt router through shunting coupler, the optical splitter of ODN successively afterwards, enter corresponding branch optical fiber and arrive each ONU;
Step S202, the up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and enter multi-mode coupler along branch optical fiber Jing Ge road shunt router, through multi-mode coupler be coupled into shunting coupler laggard enter trunk optical fiber, transfer to WDM filter through trunk optical fiber; If the optical module of OLT has the function of OTDR, be all directed to OLT from WDM filter up light and light path detection reflection of light light out; Otherwise, being directed to OLT from WDM filter up light out, light path detects reflection of light light and is directed to OTDR instrument.
Particularly, the present embodiment carry out EPON fiber failure detect general principle as follows:
First the downlink business light sending from OLT and the light path sending from OTDR instrument detect the light while arrives the shunting coupler that is positioned at ODN the second interface through trunk optical fiber, go out the 3rd interface and enter optical splitter, go out the first interface that arrives each shunt router after optical splitter, go out the second interface of router along separate routes and enter corresponding branch optical fiber, arrive on each ONU finally by branch optical fiber.
And the up light sending from ONU and the light path on each branch optical fiber detect reflection of light light along branch optical fiber arrival the second interface of router along separate routes, go out the monomode fiber that the 3rd interface of router along separate routes enters multi-mode coupler and divide support interface, after multi-mode coupler coupling, go out the first interface of its multimode fiber interface arrival shunting coupler, the second interface that goes out shunting coupler enters trunk optical fiber, after trunk optical fiber transmission, arrive on WDM filter, if the optical module of OLT does not have the function of OTDR, up light is directed to OLT, and detection of reflected light is directed on OTDR instrument, if the optical module of OLT has the function of OTDR, all directly arrive OLT through optical module from WDM filter up light and detection of reflected light out so, directly these light are processed by OLT.
The present embodiment passes through such scheme, on trunk optical fiber and between optical splitter, set up shunting coupler, on branch optical fiber and between optical splitter, set up router along separate routes, between each router along separate routes and shunting coupler, be connected by multi-mode coupler, wherein, shunting coupler and along separate routes router selective light circulator, thus by up-downgoing light separately, descending light is walked original light path, wherein detect light and also walk omnidistance light path, and up light is except original light path of branch optical fiber and trunk optical fiber, walk around optical splitter and walk the bypass of multi-mode coupler, thereby greatly reduce the loss of its light path, the power budget of up light is greatly lowered, improve the useful life of ONU, and reduce manufacturing cost, also meet modern's energy-conserving and environment-protective theory, and the detection of reflected light of branch optical fiber is owing to having walked around optical splitter, reduce loss, detection of reflected luminous energy is arrived at and be positioned on the OTDR instrument at OLT place, realize the object at OLT place detection branches fiber failure.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. the optical fiber fault detecting system of an EPON, comprise optical line terminal OLT, optical time domain reflectometer OTDR instrument, wave division multiplexing WDM filter, optical splitter and some optical network unit ONU, between described WDM filter and optical splitter, form trunk optical fiber, between described optical splitter and each ONU, form branch optical fiber, it is characterized in that, described trunk optical fiber is provided with shunting coupler, described branch optical fiber is provided with router along separate routes, between each router along separate routes and described shunting coupler, is connected by multi-mode coupler.
2. system according to claim 1, it is characterized in that, described multi-mode coupler one end is the multimode fiber interface that multimode passage or multimode fiber form, the other end is that multiple monomode fibers of multiple single mode passages or multiple monomode fiber composition divide support interface, and middle scioptics or coupling channel are coupled two ends; Described shunting coupler is connected with the multimode fiber interface of described multi-mode coupler, and described shunt router divides support interface to be connected with the monomode fiber of described multi-mode coupler.
3. system according to claim 2, it is characterized in that, described shunting coupler is the optical circulator of three interfaces, and its first interface is connected with the multimode fiber interface of multi-mode coupler, the second interface is connected with trunk optical fiber, and the 3rd interface is connected with the general-purpose interface of optical splitter.
4. system according to claim 3, is characterized in that, between the first interface of described shunting coupler and the multimode fiber interface of multi-mode coupler, is provided with lens, for the optical coupling of multimode fiber interface being entered to the first interface of shunting coupler.
5. according to the system described in claim 2,3 or 4, it is characterized in that, described shunt router is the optical circulator of three interfaces, its first interface is connected with a point support interface for optical splitter, the second interface is connected with branch optical fiber, and its 3rd interface divides support interface to be connected with the monomode fiber of multi-mode coupler.
6. system according to claim 1, it is characterized in that, downlink business light and light path detect light and send from OLT and OTDR instrument respectively, enter trunk optical fiber through WDM filter simultaneously, arrive each shunt router through shunting coupler, the optical splitter of ODN successively afterwards, enter corresponding branch optical fiber and arrive each ONU;
The up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and enter multi-mode coupler along branch optical fiber Jing Ge road shunt router, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, transfer to WDM filter through trunk optical fiber; If the optical module of OLT has the function of OTDR, be all directed to OLT from WDM filter up light and light path detection reflection of light light out; Otherwise, being directed to OLT from WDM filter up light out, light path detects reflection of light light and is directed to OTDR instrument.
7. a fiber failure detection method for EPON, is characterized in that, comprising:
Downlink business light and light path detect light and send from OLT and OTDR instrument respectively, enter trunk optical fiber through WDM filter simultaneously, arrive each shunt router successively afterwards through shunting coupler, the optical splitter of ODN, enter corresponding branch optical fiber and arrive each ONU;
The up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and enter multi-mode coupler along branch optical fiber Jing Ge road shunt router, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, transfer to WDM filter through trunk optical fiber; If the optical module of OLT has the function of OTDR, be all directed to OLT from WDM filter up light and light path detection reflection of light light out; Otherwise, being directed to OLT from WDM filter up light out, light path detects reflection of light light and is directed to OTDR instrument.
8. method according to claim 7, it is characterized in that, described downlink business light and light path detect light and send from OLT and OTDR instrument respectively, enter trunk optical fiber through WDM filter simultaneously, arrive each shunt router through shunting coupler, the optical splitter of ODN successively afterwards, enter the step that corresponding branch optical fiber arrives each ONU and comprise:
Downlink business light and light path detect light and send from OLT and OTDR instrument respectively, enter trunk optical fiber through WDM filter simultaneously and arrive the second interface of shunting coupler that is positioned at ODN, the 3rd interface that goes out shunting coupler enters optical splitter, go out the first interface that arrives each shunt router after optical splitter, go out the second interface of router along separate routes and enter corresponding branch optical fiber, arrive each ONU finally by branch optical fiber.
9. method according to claim 8, it is characterized in that, if the optical module of OLT does not have the function of OTDR, the described up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and enter multi-mode coupler along branch optical fiber Jing Ge road shunt router, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, after trunk optical fiber transfers to WDM filter, up light is directed to OLT, and the step that light path detection reflection of light light is directed to OTDR instrument comprises:
The up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and arrive the second interface of router along separate routes along branch optical fiber, go out the monomode fiber that the 3rd interface of router along separate routes enters multi-mode coupler and divide support interface, after multi-mode coupler coupling, go out the first interface of its multimode fiber interface arrival shunting coupler, the second interface that goes out shunting coupler enters trunk optical fiber, after trunk optical fiber transmission, arrive on WDM filter, then up light is directed to OLT, and detection of reflected light is directed to OTDR instrument.
10. method according to claim 8, it is characterized in that, if the optical module of OLT has the function of OTDR, the described up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and enter multi-mode coupler along branch optical fiber Jing Ge road shunt router, through multi-mode coupler be coupled to shunting coupler laggard enter trunk optical fiber, after trunk optical fiber transfers to WDM filter, up light is directed to OLT, and the step that light path detection reflection of light light is directed to OTDR instrument comprises:
The up light sending from ONU and the light path on each branch optical fiber detect reflection of light light and arrive the second interface of router along separate routes along branch optical fiber, go out the monomode fiber that the 3rd interface of router along separate routes enters multi-mode coupler and divide support interface, after multi-mode coupler coupling, go out the first interface of its multimode fiber interface arrival shunting coupler, the second interface that goes out shunting coupler enters trunk optical fiber, after trunk optical fiber transmission, arrive on WDM filter, then up light and detection of reflected light are all directed to OLT.
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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 |
| CN111595241A (en) * | 2019-02-21 | 2020-08-28 | 中兴通讯股份有限公司 | Optical fiber monitoring method and device |
| CN112583475A (en) * | 2019-09-27 | 2021-03-30 | 华为技术有限公司 | Test method, optical line terminal and optical network terminal |
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