CN101282586B - Method, system and apparatus for detecting optical fiber fault in passive optical network - Google Patents
Method, system and apparatus for detecting optical fiber fault in passive optical network Download PDFInfo
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- CN101282586B CN101282586B CN2008101116207A CN200810111620A CN101282586B CN 101282586 B CN101282586 B CN 101282586B CN 2008101116207 A CN2008101116207 A CN 2008101116207A CN 200810111620 A CN200810111620 A CN 200810111620A CN 101282586 B CN101282586 B CN 101282586B
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Abstract
The invention provides an optical fiber fault detection method in PON. The method comprises: outputting two optical fibers from optical line terminal (OLT) to separately couple all junction boxed, and outputting one optical fiber from the junction boxes to connect an optical network unit (ONU), wherein, the two optical fibers outputted by OLT separately start from a first optical module and a second optical module of OLT, and pass through each junction box to separately return to a first GE optical port and a second GE optical port of OLT; the first GE optical port and the second GE optical port separately detect if light is on the optical fiber connected with the first GE optical port and the second GE optical port, and report detection result to CPU, then CPU determines if the two optical fibers outputted by OLT turn up fault according to the received detection result. Moreover, the invention also provides an optical fiber protection system in PON, a junction box and an OLT. Making use of the technical scheme provided by the invention can improve accuracy of optical fiber fault detection.
Description
Technical field
The present invention relates to EPON (PON, Passive Optical Network) technology, relate in particular to fiber failure detection system and device in the EPON.
Background technology
PON is the EPON of a kind of point to multipoint configuration, has advantages such as easy care, high bandwidth, low cost, is present widely used a kind of smooth access technology.Fig. 1 shows the PON structural representation, mainly comprise: optical line terminal (OLT, Optical Line Terminal), passive optical splitters (POS, Passive Optical Splitter) and optical network unit (ONU, Optical Network Unit), link to each other by optical fiber between OLT, POS and the ONU.
As shown in Figure 1, PON has single fiber transmission bi-directional data and puts the characteristic of multiple spot, in this case, if the trunk optical fiber between OLT and the POS breaks down, will certainly cause a large amount of ONU service disconnection so.For addressing this problem, improve network reliability, introduced optical fibre protection inverting mechanism among the PON; that is: a redundant other optical fiber is as backup optical fiber; when the master breaks down with optical fiber, automatically or manually PON is switched on the backup optical fiber, to guarantee the normal operation of PON.Shown in Fig. 2 a～2c, existing optical fibre protection inverting structure mainly contains following three kinds: one, OLT adopts single PON mouth, at built-in 1 * 2 switch in OLT PON mouth place, realize being connected of OLT and ONU by 2:N optical splitter, the trunk optical fiber between OLT and the optical splitter is carried out redundancy protecting; Two, OLT adopts double-PON port, realizes being connected of OLT and ONU by a 2:N optical splitter, and OLT PON mouth and trunk optical fiber are all carried out redundancy protecting; Three, OLT adopts double-PON port, realizes being connected of OLT and ONU by two 1:N optical splitters, not only OLT PON mouth, trunk optical fiber redundancy, and the branch optical fiber between optical splitter and optical splitter and ONU is also redundant, the realization full guard.
Realize that the prerequisite that protection is switched is to detect fiber failure, present existing fiber failure detection means comprises following two kinds: whether one, OLT detects ONU up light, if having, determines that then optical fiber is normal; Otherwise, determine fiber failure; Two, OLT distributes one to find window to ONU at set intervals, if OLT does not receive the register requirement of ONU in this window, then determines fiber failure.
But for first kind of detection mode, if optical fiber is normal, only not have uplink traffic in certain period be that ONU does not have up light to ONU, then is easy to occur normal optical fiber erroneous judgement is the situation of fault optical fiber; For second kind of detection mode,, also be easy to occur normal optical fiber erroneous judgement is the situation of fault optical fiber if in finding window, do not have new ONU to send register requirement to OLT.As seen, the accuracy of existing fiber failure detection schemes is lower, can't realize accurate detection.
Summary of the invention
In view of this, the object of the present invention is to provide fiber failure detection method, system and device among a kind of PON, improve the accuracy that fiber failure detects.
For achieving the above object, technical scheme provided by the invention is as follows:
Fiber failure detection method in a kind of EPON, this method comprises:
Be connected in series all junction boxs respectively from two optical fiber of optical line terminal OLT output, connect optical network unit ONU from optical fiber of junction box output, wherein, two optical fiber of OLT output return a GE light mouth and the 2nd GE light mouth of OLT respectively respectively from first optical module and second optical module of OLT behind each junction box of process;
Under the initial condition, first optical module is opened, and second optical module is closed; The one GE light mouth detects and self connects the descending light whether first optical module is arranged on the optical fiber, when a GE light mouth detected less than the light time, report interrupt signal to CPU, after CPU receives interrupt signal, determine that the optical fiber that links to each other with a GE light mouth breaks down, and opens second optical module, and judge whether the 2nd GE light mouth detects light, if determine that then the optical fiber that links to each other with the 2nd GE light mouth is normal, closes first optical module; Otherwise, determine that the optical fiber that links to each other with the 2nd GE light mouth also breaks down.
Described junction box comprises that dividing equally optical splitter and two for one does not divide equally optical splitter, wherein, divide equally optical splitter and be connected, do not divide equally optical splitter for two and link to each other with two optical fiber of OLT output respectively, and two are not divided equally optical splitter and draw one road branch optical fiber respectively and converge to and divide equally optical splitter with ONU.
When determining the optical fiber that links to each other with the 2nd GE light mouth and also break down, keep first optical module and second optical module all to open.
In the fiber failure testing process, described GE light mouth is closed up lighting function.
Optical fiber protection system in a kind of EPON, this system comprises: OLT, ONU and junction box, described OLT comprises: first optical module, second optical module, a GE light mouth, the 2nd GE light mouth and CPU, wherein,
Two optical fiber of OLT output are connected in series all junction boxs respectively, optical fiber of junction box output connects ONU, two optical fiber of OLT output return a GE light mouth and the 2nd GE light interruption-forming loop of OLT respectively respectively from first optical module and second optical module of OLT behind each junction box of process;
Under the initial condition, first optical module is opened, and second optical module is closed; The one GE light mouth detects and self connects the descending light whether first optical module is arranged on the optical fiber, when a GE light mouth detected less than the light time, report interrupt signal to CPU, after CPU receives interrupt signal, determine that the optical fiber that links to each other with a GE light mouth breaks down, and opens second optical module, and judge whether the 2nd GE light mouth detects light, if determine that then the optical fiber that links to each other with the 2nd GE light mouth is normal, closes first optical module; Otherwise, determine that the optical fiber that links to each other with the 2nd GE light mouth also breaks down;
When the CPU among the OLT determines any one optical fiber on the optical fiber loop that connects OLT and each junction box and breaks down, ONU by on the described optical fiber loop normally optical fiber communicate by letter with OLT.
Described junction box comprises that dividing equally optical splitter and two for one does not divide equally optical splitter, wherein, divide equally optical splitter and be connected, do not divide equally optical splitter for two and link to each other with two optical fiber of OLT output respectively, and two are not divided equally optical splitter and draw one road branch optical fiber respectively and converge to and divide equally optical splitter with ONU.
A kind of junction box, this junction box comprises: divide equally optical splitter and two for one and do not divide equally optical splitter, wherein, dividing equally optical splitter is connected with ONU, do not divide equally optical splitter for two and link to each other with two optical fiber of OLT output respectively, and two are not divided equally optical splitter and draw one road branch optical fiber respectively and converge to and divide equally optical splitter.
A kind of OLT, be arranged in the EPON that comprises ONU and junction box, this OLT comprises: first optical module, second optical module, a GE light mouth, the 2nd GE light mouth and CPU, wherein, return a GE light mouth after optical fiber of first optical module output is connected in series all junction boxs, return the 2nd GE light mouth after optical fiber of second optical module output is connected in series all junction boxs;
The one GE light mouth is used to detect and self connects the descending light whether first optical module is arranged on the optical fiber, and testing result is reported CPU; The 2nd GE light mouth is used to detect and self connects the descending light whether second optical module is arranged on the optical fiber, and testing result is reported CPU;
CPU is used to receive the testing result that a GE light mouth and the 2nd GE light mouth report, and determines according to the testing result of receiving whether the optical fiber of first optical module output and the optical fiber of second optical module output break down;
Under the initial condition, described first optical module is opened, and described second optical module is closed; The one GE light mouth detected less than the light time, report interrupt signal to CPU, after CPU receives interrupt signal, determine that the optical fiber that links to each other with a GE light mouth breaks down, open second optical module, and judge whether the 2nd GE light mouth detects light, if, determine that then the optical fiber that links to each other with the 2nd GE light mouth is normal, closes first optical module; Otherwise, determine that the optical fiber that links to each other with the 2nd GE light mouth also breaks down.
When determining the optical fiber that links to each other with the 2nd GE light mouth and also break down, keep first optical module and second optical module all to open.
In the fiber failure testing process, described GE light mouth is closed up lighting function.
This shows in optical fibre ring provided by the invention protection structure, because the optical fiber of OLT output is looped back to the GE light mouth of OLT at last again, the mode that therefore can utilize GE light mouth to detect the descending light that OLT sends on optical fiber comes detection fiber whether to break down.Adopt this fiber failure detection scheme provided by the invention, can in time find fiber failure, with respect to existing two kinds of fiber failure detection schemes, advantage is very obvious, not only can avoid improving the accuracy that fiber failure detects because of ONU does not have up flow or do not have the fiber failure erroneous judgement problem that register requirement causes; And the implementation complexity of this detection scheme is less, only need utilize OLT to go up existing common GE light mouth and can realize that just fiber failure detects, need not in PON, to increase any peripheral components or circuit, also need not OLT equipment is done any change, implement comparatively simply, cost is also very low.
Description of drawings
Fig. 1 is a PON structural representation of the prior art;
Fig. 2 a～2c is three kinds of optical fibre protection inverting structural representations of the prior art;
Fig. 3 is the optical fiber protection system structural representation in the embodiment of the invention;
Fig. 4 is the junction box structural representation in the embodiment of the invention;
Schematic diagram is switched in protection when Fig. 5 breaks down for optical fiber in the embodiment of the invention;
Fig. 6 is the fiber failure detection method flow chart in the embodiment of the invention;
Fig. 7 is the OLT structural representation in the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings is described in further detail the present invention.
In order to solve the problems of the prior art, the present invention has at first proposed a kind of optical fiber protection system based on looped network, has provided a kind of brand-new fiber failure detection scheme based on this optical fiber protection system then.
Optical fiber protection system structure based on looped network provided by the invention is referring to shown in Figure 3; comprise: OLT, ONU and junction box; two optical fiber of OLT output are connected in series all junction boxs respectively; optical fiber of junction box output connects ONU; two optical fiber of OLT output are all from the optical module of OLT; arrive the GE light mouth termination of OLT then, constitute closed circuit respectively.Here for ease of describing, distinguish with first optical module, a GE light mouth, second optical module and the 2nd GE light mouth respectively, and wherein the loop of an optical fiber formation is called outer shroud, the loop that another root optical fiber is formed is called interior ring.When actual engineering construction, two optical fiber exporting from OLT both can be positioned at same optical cable, also can be positioned at different optical cables.Wherein, described optical module type can be 1000BASE_PX_D_SFP; Described GE light mouth is that OLT goes up existing interface module, here used as the destination node of OLT output optical fibre.
Among Fig. 3 the effect of junction box mainly be make ONU on the Fiber In The Loop FITE of both direction can both with the OLT proper communication.Fig. 4 shows a kind of specific implementation structure of junction box, by three independently 1: 2 optical splitter form: splitting ratio be 50: 50 divide equally optical splitter and two splitting ratios be 5: 95 do not divide equally optical splitter.Wherein, dividing equally optical splitter is connected with ONU; Not dividing equally optical splitter for two lays respectively on interior ring optical fiber and the outer shroud optical fiber, ring optical fiber and outer shroud optical fiber in their input is respectively, and draw ring optical fiber and the output of outer shroud optical fiber in one tunnel respectively, do not divide equally optical splitter and also draw one road branch optical fiber respectively and converge to and divide equally optical splitter for these two in addition.By these optical splitters, two optical fiber of ONU and OLT output have been realized being connected, for OLT between communicate by letter and lay a good foundation.Need to prove, do not divide equally the splitting ratio of optical splitter on the trunk optical fiber and can adjust according to actual networking demand.
Based on optic fibre of looped network protection system shown in Figure 3, schematic diagram is switched in the protection that Fig. 5 shows when optical fiber breaks down among Fig. 3.As shown in Figure 5, when two optical fiber between two junction boxs among the figure all rupture, the ONU that broken fiber left side junction box is hung down still can be connected to OLT by clockwise optical fiber, and the ONU that broken fiber right side junction box is hung down still can be connected to OLT by anticlockwise optical fiber; If a just fibercuts wherein, ONU then obviously can be connected with OLT by the normal optical fiber of another root.As seen, behind the optical fiber protection system of employing based on looped network, go up the fibercuts at arbitrary place for ring; can switch by the optical fiber protection of encircling both sides connection OLT; thereby realized professional lasting connection, avoided service disconnection, reduced the influence of fibercuts whole Network.
More than optic fibre of looped network protection system provided by the invention has been done to elaborate, below mainly the fiber failure detection scheme based on this system is elaborated.
Because the reception optical wavelength of GE light mouth is 1490nm, the transmission optical wavelength is 1310nm, and is identical with transmission, the reception wavelength of OLT optical module, therefore, here can utilize GE light mouth to detect OLT, determine the optical fiber state according to testing result then by the descending light that Fiber In The Loop FITE sends.
Fig. 6 shows by GE light mouth and carries out the method flow diagram that fiber failure detects, and may further comprise the steps:
Step 601: under the initial condition, have only a fiber work usually, suppose the outer shroud fiber work among Fig. 3 here, interior ring optical fiber is standby, and promptly first optical module is opened Chang Faguang, and second optical module is closed.Under the normal situation of outer shroud optical fiber, a GE light mouth will detect the descending light of first optical module emission; Because second optical module is closed, so the 2nd GE light mouth does not have light-receiving.
Step 602: if outer shroud optical fiber breaks down, then a GE light mouth will not receive light, and this moment, the one GE light mouth reported interrupt signal to the CPU of OLT, and notice CPU outer shroud optical fiber breaks down.
After step 603:CPU received the interrupt signal that a GE light mouth reports, it was luminous to open second optical module, and judges whether the 2nd GE light mouth receives light, if the 2nd GE light mouth receives light, only outer shroud fibercuts then is described, interior ring optical fiber is normal, execution in step 604; If the 2nd GE light mouth does not receive light yet, two optical fiber complete ruptures of inner and outer ring then are described, execution in step 605.
Wherein, a fibercuts and the normal situation of another root optical fiber usually occurs in mutually redundant two optical fiber to be positioned under the scene of different optical cables; And two situations that optical fiber ruptures simultaneously are then more common when two optical fiber are positioned at same optical cable.
Step 604:CPU closes first optical module, all ONU business is switched on the normal interior ring optical fiber work, then process ends.
Step 605:CPU does not carry out any operation, keeps first optical module and second optical module all to open.
In the fiber failure testing process,, need close the up lighting function of GE light mouth in order not disturb the up light of ONU.
As seen from the above description, detect the mode of the descending light of OLT by GE light mouth, can in time find fiber failure, with respect to existing two kinds of fiber failure detection schemes, advantage is very obvious, not only can avoid improving the accuracy that fiber failure detects because of ONU does not have up flow or do not have the fiber failure erroneous judgement problem that register requirement causes; And the implementation complexity of this detection scheme is less, only need utilize OLT to go up existing common GE light mouth and can realize that just fiber failure detects, need not in PON, to increase any peripheral components or circuit, also need not OLT equipment is done any change, implement comparatively simply, cost is also very low.
Correspondingly, the present invention also provides a kind of OLT, be arranged in the EPON that comprises OLT and ONU, its structure is referring to shown in Figure 7, comprise: first optical module, second optical module, a GE light mouth, the 2nd GE light mouth and CPU, wherein, return a GE light mouth after optical fiber of first optical module output is connected in series all junction boxs, return the 2nd GE light mouth after optical fiber of second optical module output is connected in series all junction boxs; Wherein,
The one GE light mouth is used to detect and self connects the descending light whether first optical module is arranged on the optical fiber, and testing result is reported CPU; The 2nd GE light mouth is used to detect and self connects the descending light whether second optical module is arranged on the optical fiber, and testing result is reported CPU;
CPU is used to receive the testing result that a GE light mouth and the 2nd GE light mouth report, and determines according to the testing result of receiving whether the optical fiber of first optical module output and the optical fiber of second optical module output break down.
Among Fig. 7, under the initial condition, first optical module is opened, and second optical module is closed; The one GE light mouth detected less than the light time, report interrupt signal to CPU, after CPU receives interrupt signal, determine that the optical fiber that links to each other with a GE light mouth breaks down, open second optical module, and judge whether the 2nd GE light mouth detects light, if, determine that then the optical fiber that links to each other with the 2nd GE light mouth is normal, closes first optical module; Otherwise, determine that the optical fiber that links to each other with the 2nd GE light mouth also breaks down, and keeps first optical module and second optical module all to open.
Need to prove that the above-mentioned GE of utilization light mouth carries out the scheme that fiber failure detects, be not only applicable to the OLT of single PON mouth, also be applicable to the OLT of double-PON port.
The above has carried out further detailed description to purpose of the present invention, technical scheme and beneficial effect; institute is understood that; the above is not in order to restriction the present invention; within the spirit and principles in the present invention all; any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the fiber failure detection method in the EPON is characterized in that this method comprises:
Be connected in series all junction boxs respectively from two optical fiber of optical line terminal OLT output, connect optical network unit ONU from optical fiber of junction box output, wherein, two optical fiber of OLT output return a GE light mouth and the 2nd GE light mouth of OLT respectively respectively from first optical module and second optical module of OLT behind each junction box of process;
Under the initial condition, first optical module is opened, and second optical module is closed; The one GE light mouth detects and self connects the descending light whether first optical module is arranged on the optical fiber, when a GE light mouth detected less than the light time, report interrupt signal to CPU, after CPU receives interrupt signal, determine that the optical fiber that links to each other with a GE light mouth breaks down, and opens second optical module, and judge whether the 2nd GE light mouth detects light, if determine that then the optical fiber that links to each other with the 2nd GE light mouth is normal, closes first optical module; Otherwise, determine that the optical fiber that links to each other with the 2nd GE light mouth also breaks down, and keeps first optical module and second optical module all to open.
2. method according to claim 1, it is characterized in that, described junction box comprises that dividing equally optical splitter and two for one does not divide equally optical splitter, wherein, dividing equally optical splitter is connected with ONU, do not divide equally optical splitter for two and link to each other with two optical fiber of OLT output respectively, and two are not divided equally optical splitter and draw one road branch optical fiber respectively and converge to and divide equally optical splitter.
3. method according to claim 1 is characterized in that, in the fiber failure testing process, described GE light mouth is closed up lighting function.
4. the optical fiber protection system in the EPON is characterized in that this system comprises: OLT, ONU and junction box, and described OLT comprises: first optical module, second optical module, a GE light mouth, the 2nd GE light mouth and CPU, wherein,
Two optical fiber of OLT output are connected in series all junction boxs respectively, optical fiber of junction box output connects ONU, two optical fiber of OLT output return a GE light mouth and the 2nd GE light interruption-forming loop of OLT respectively respectively from first optical module and second optical module of OLT behind each junction box of process;
Under the initial condition, first optical module is opened, and second optical module is closed; The one GE light mouth detects and self connects the descending light whether first optical module is arranged on the optical fiber, when a GE light mouth detected less than the light time, report interrupt signal to CPU, after CPU receives interrupt signal, determine that the optical fiber that links to each other with a GE light mouth breaks down, and opens second optical module, and judge whether the 2nd GE light mouth detects light, if determine that then the optical fiber that links to each other with the 2nd GE light mouth is normal, closes first optical module; Otherwise, determine that the optical fiber that links to each other with the 2nd GE light mouth also breaks down, and keeps first optical module and second optical module all to open;
When the CPU among the OLT determines any one optical fiber on the optical fiber loop that connects OLT and each junction box and breaks down, ONU by on the described optical fiber loop normally optical fiber communicate by letter with OLT.
5. system according to claim 4, it is characterized in that, described junction box comprises that dividing equally optical splitter and two for one does not divide equally optical splitter, wherein, dividing equally optical splitter is connected with ONU, do not divide equally optical splitter for two and link to each other with two optical fiber of OLT output respectively, and two are not divided equally optical splitter and draw one road branch optical fiber respectively and converge to and divide equally optical splitter.
6. junction box that is applied in the described optical fiber protection system of claim 4; it is characterized in that; this junction box comprises: divide equally optical splitter and two for one and do not divide equally optical splitter; wherein; dividing equally optical splitter is connected with ONU; do not divide equally optical splitter for two and link to each other with two optical fiber of OLT output respectively, and two are not divided equally optical splitter and draw one road branch optical fiber respectively and converge to and divide equally optical splitter.
7. OLT, be arranged in the EPON that comprises ONU and junction box, it is characterized in that, this OLT comprises: first optical module, second optical module, a GE light mouth, the 2nd GE light mouth and CPU, wherein, return a GE light mouth after optical fiber of first optical module output is connected in series all junction boxs, return the 2nd GE light mouth after optical fiber of second optical module output is connected in series all junction boxs;
The one GE light mouth is used to detect and self connects the descending light whether first optical module is arranged on the optical fiber, and testing result is reported CPU; The 2nd GE light mouth is used to detect and self connects the descending light whether second optical module is arranged on the optical fiber, and testing result is reported CPU;
CPU is used to receive the testing result that a GE light mouth and the 2nd GE light mouth report, and determines according to the testing result of receiving whether the optical fiber of first optical module output and the optical fiber of second optical module output break down;
Under the initial condition, described first optical module is opened, and described second optical module is closed; The one GE light mouth detected less than the light time, report interrupt signal to CPU, after CPU receives interrupt signal, determine that the optical fiber that links to each other with a GE light mouth breaks down, open second optical module, and judge whether the 2nd GE light mouth detects light, if, determine that then the optical fiber that links to each other with the 2nd GE light mouth is normal, closes first optical module; Otherwise, determine that the optical fiber that links to each other with the 2nd GE light mouth also breaks down, and keeps first optical module and second optical module all to open.
8. OLT according to claim 7 is characterized in that, in the fiber failure testing process, described GE light mouth is closed up lighting function.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101902665B (en) * | 2009-05-26 | 2014-05-07 | 华为技术有限公司 | Optical line terminal, optical add-drop multiplexer and optical access system |
| CN102104421B (en) * | 2009-12-16 | 2015-03-25 | 华为技术有限公司 | Branched optical fiber failure detection method and device for optical network, and optical network |
| CN102104424B (en) * | 2011-03-04 | 2014-12-10 | 中兴通讯股份有限公司 | Protection method and system for PON (Passive Optical Network) |
| CN102740171B (en) * | 2011-04-08 | 2015-08-12 | 中兴通讯股份有限公司 | A kind of EPON loop detecting method and system |
| CN102263587B (en) * | 2011-07-26 | 2017-07-14 | 中兴通讯股份有限公司 | The optical port changing method and system of optical network unit |
| CN104836621A (en) * | 2015-05-25 | 2015-08-12 | 博为科技有限公司 | Optical network equipment |
| CN113132001A (en) * | 2019-12-30 | 2021-07-16 | 中兴通讯股份有限公司 | Optical module management method, optical module management device, network equipment and storage medium |
| CN113938768B (en) * | 2020-06-29 | 2023-04-11 | 华为技术有限公司 | Optical network operation information monitoring method and related equipment |
| CN113395614B (en) * | 2021-06-03 | 2022-08-30 | 博为科技有限公司 | Passive optical network system and data transmission method |
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