CN106160846B - Method and apparatus for detecting PON network line fault - Google Patents

Method and apparatus for detecting PON network line fault Download PDF

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Publication number
CN106160846B
CN106160846B CN201510195215.8A CN201510195215A CN106160846B CN 106160846 B CN106160846 B CN 106160846B CN 201510195215 A CN201510195215 A CN 201510195215A CN 106160846 B CN106160846 B CN 106160846B
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value
return loss
drop cable
optical branching
reflection event
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CN106160846A (en
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杜喆
沈成彬
蒋铭
汪国荣
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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Abstract

The present invention discloses a kind of method and apparatus for detecting PON network line fault.This method includes:The return loss value of OTDR reflection events in PON network is detected;Whether the difference of the return loss value for judging Drop cable end reflection event and corresponding return loss health value is more than first predetermined value;If more than first predetermined value, then judge that the return loss value of Drop cable end reflection event is abnormal, and judges whether the return loss value in the reflection event of the affiliated optical branching device of Drop cable and the difference of corresponding return loss health value are more than second predetermined value;If being not more than second predetermined value, judge that wear-out failure occurs for Drop cable.The present invention is detected the return loss measurement for the reflection event that optical branching device in the reflection event of Drop cable end formation in PON network and PON network is formed, and it is compared with corresponding return loss health value, to determine the position of fibre circuit wear-out failure, to improve O&M efficiency, O&M cost is reduced.

Description

Method and apparatus for detecting PON network line fault
Technical field
The present invention relates to field of telecommunication devices, more particularly to a kind of methods and dress for detecting PON network line fault It sets.
Background technology
OTDR (Optical Time Domain Reflector, optical time domain reflectometer) has become traditional fiber link The indispensable tool of accident analysis and positioning, but in PON (Passive Optical Network, passive optical network) ODN (light Distribute network, Optical Distribution Network) in network in application, since PON ODN introduce level-one even Two level optical branching device causes OTDR measurements light pulse signal on Distribution fibers and Drop cable significantly to be decayed.
Meanwhile under point-to-multipoint ODN structures, the backscatter signals of decay events can also be by fault branch optical fiber Backscatter signals to other branch optical fibers are superimposed interference, eventually lead to OTDR and can not detect in most cases and match Wear-out failure event on linear light fibre and Drop cable, and the link attenuation value that is introduced by the failure.
Invention content
In view of the above technical problem, the present invention provides a kind of method and apparatus for detecting PON network line fault, The measurement and diagnosis that Distribution fibers and Drop cable wear-out failure may be implemented reduce O&M cost to improve O&M efficiency.
According to an aspect of the present invention, a kind of method for detecting PON network line fault is provided, including:
The return loss value of OTDR reflection events in PON network is detected, wherein reflection event includes Drop cable End reflection event and optical branching device reflection event;
Judge whether the difference of the return loss value and corresponding return loss health value of Drop cable end reflection event is big In first predetermined value;
If the return loss value of Drop cable end reflection event and the difference of corresponding return loss health value are more than first Predetermined value then judges that the return loss value of Drop cable end reflection event is abnormal, and further directed to return loss value exception The affiliated optical branching device of Drop cable reflection event, judge return loss value and corresponding return loss health value difference whether More than second predetermined value;
If the return loss value in the reflection event of the affiliated optical branching device of Drop cable and corresponding return loss health value Difference is not more than second predetermined value, then judges that wear-out failure occurs for Drop cable.
In one embodiment of the invention, the method further includes:
If the return loss value in the reflection event of the affiliated optical branching device of Drop cable and corresponding return loss health value Difference is more than second predetermined value, then further judges whether the affiliated optical branching device of Drop cable is level-one optical branching device;
If the affiliated optical branching device of Drop cable is level-one optical branching device, level-one optical branching device failure or trunk light are judged Wear-out failure occurs for fibre.
In one embodiment of the invention, the method further includes:
If the affiliated optical branching device of Drop cable is two level optical branching device, one belonging to two level optical branching device is further judged Whether the difference of return loss value and corresponding return loss health value in the reflection event of grade optical branching device is predetermined more than third Value;
If the difference of the return loss value and corresponding return loss health value in the reflection event of level-one optical branching device is more than Third predetermined value then judges that wear-out failure occurs for level-one optical branching device failure or trunk optical fiber.
In one embodiment of the invention, the method further includes:If returning in the reflection event of level-one optical branching device The difference of wave loss value and corresponding return loss health value is not more than third predetermined value, then judge two level optical branching device failure or Wear-out failure occurs for Distribution fibers.
In one embodiment of the invention, after the return loss value exception of judgement Drop cable end reflection event, The method further includes:
Judge whether the quantity of the Drop cable end reflection event of return loss value exception is more than 1;
If the quantity of the Drop cable end reflection event of return loss value exception is 1, it is directed to the Drop cable end The reflection event of affiliated optical branching device, execution judge whether return loss value and the difference of corresponding return loss health value are more than The step of second predetermined value.
In one embodiment of the invention, the method further includes:
If the quantity of the Drop cable end reflection event of return loss value exception is more than 1, further to return loss The Drop cable end reflection event of value exception is grouped, wherein in the same reflection event group, belonging to Drop cable Optical branching device is identical;
It is unique for this if in group only including a Drop cable end reflection event for each reflection event group Drop cable end belonging to optical branching device reflection event, execution judge return loss value and corresponding return loss health value Difference whether be more than second predetermined value the step of.
In one embodiment of the invention, the method further includes:If in group including at least two Drop cable ends Reflection event, then be directed to the reflection event of the common affiliated optical branching device in Drop cable end in the group, and execution judges that echo damages The step of whether consumption value and the difference of corresponding return loss health value are more than second predetermined value.
In one embodiment of the invention, the method further includes:If wear-out failure occurs for Drop cable, according to public affairs Formula
A=(R1-R2)/2
Obtain attenuation loss the value A, wherein R of decay events in faulty link1Indicate the health of reflection event return loss Value, R2Indicate the fault value of reflection event return loss.
In one embodiment of the invention, the method further includes:If device failure is accessed, according to formula
Obtain the attenuation loss value A of decay events in faulty link, wherein access device is two level optical branching device or wiring Optical fiber or level-one optical branching device or trunk optical fiber, n are the Drop cable quantity that failure accesses that device is related to, R1iIndicate i-th of institute State the health value of the reflection event return loss for the Drop cable end being related to, R2iIndicate the Drop cable being related to described in i-th The fault value of the reflection event return loss of end.
According to another aspect of the present invention, a kind of device for detecting PON network line fault, including OTDR moulds are provided Block, the first identification module, the second identification module and fault determination module, wherein:
OTDR modules are detected, wherein reflection event for the return loss value to OTDR reflection events in PON network Including Drop cable end reflection event and optical branching device reflection event;
First identification module, the return loss value and corresponding return loss for judging Drop cable end reflection event are strong Whether the difference of health value is more than first predetermined value;
Second identification module, for the judging result according to the first identification module, in Drop cable end reflection event When the difference of return loss value and corresponding return loss health value is more than first predetermined value, Drop cable end reflection event is judged Return loss value it is abnormal, and the reflection event of the affiliated optical branching device of Drop cable further directed to return loss value exception, Judge whether return loss value and the difference of corresponding return loss health value are more than second predetermined value;
Fault determination module, for the judging result according to the second identification module, in the affiliated optical branching device of Drop cable The difference of return loss value and corresponding return loss health value in reflection event is not more than second predetermined value, then judges light of registering one's residence Wear-out failure occurs for fibre.
In one embodiment of the invention, described device further includes third identification module, wherein:
Third identification module, for the judging result according to the second identification module, in the affiliated optical branching device of Drop cable When the difference of return loss value in reflection event and corresponding return loss health value is more than second predetermined value, further judge into Whether optical fiber affiliated optical branching device in family is level-one optical branching device;
Fault determination module is additionally operable to the judging result according to third identification module, is in the affiliated optical branching device of Drop cable When level-one optical branching device, judge that wear-out failure occurs for level-one optical branching device failure or trunk optical fiber.
In one embodiment of the invention, described device further includes the 4th identification module, wherein:
4th identification module is used for the judging result according to third identification module, is in the affiliated optical branching device of Drop cable When two level optical branching device, the return loss in the reflection event of the level-one optical branching device belonging to two level optical branching device is further judged Whether the difference of value and corresponding return loss health value is more than third predetermined value;
Fault determination module is additionally operable to the judging result according to the 4th identification module, in the reflection event of level-one optical branching device In the difference of return loss value and corresponding return loss health value when being more than third predetermined value, judgement level-one optical branching device therefore Wear-out failure occurs for barrier or trunk optical fiber.
In one embodiment of the invention, fault determination module is additionally operable to the judging result according to the 4th identification module, The difference of return loss value and corresponding return loss health value in the reflection event of level-one optical branching device is pre- no more than third When definite value, judge that wear-out failure occurs for two level optical branching device failure or Distribution fibers.
In one embodiment of the invention, described device further includes the 5th identification module, wherein:
5th identification module, for judging that the return loss value of Drop cable end reflection event is different in the second identification module Chang Hou, judges whether the quantity of the Drop cable end reflection event of return loss value exception is more than 1;
Second identification module is specifically used for the judging result according to the 5th identification module, in registering one's residence for return loss value exception When the quantity of fiber end reflections event is 1, for the reflection event of the optical branching device belonging to the Drop cable end, execution is sentenced Whether disconnected return loss value is more than the operation of second predetermined value with the difference of corresponding return loss health value.
In one embodiment of the invention, described device further includes grouping module, wherein:
Grouping module, it is anti-in the Drop cable end of return loss value exception according to the judging result of the 5th identification module When penetrating the quantity of event more than 1, further the Drop cable end reflection event of return loss value exception is grouped, wherein In the same reflection event group, the optical branching device belonging to Drop cable is identical;
Second identification module is specifically used for for each reflection event group, only includes that a Drop cable end is anti-in group When penetrating event, for the reflection event of the optical branching device belonging to unique Drop cable end, execution judges return loss value Whether it is more than the operation of second predetermined value with the difference of corresponding return loss health value.
In one embodiment of the invention, the second identification module is specifically used in group including at least two Drop cables When end reflection event, for the reflection event of the common affiliated optical branching device in Drop cable end in the group, execution judges back Whether wave loss value is more than the operation of second predetermined value with the difference of corresponding return loss health value.
In one embodiment of the invention, described device further includes loss acquisition module, wherein:
Acquisition module is lost, is used for when wear-out failure occurs for Drop cable, according to formula
A=(R1-R2)/2
Obtain attenuation loss the value A, wherein R of decay events in faulty link1Indicate the health of reflection event return loss Value, R2Indicate the fault value of reflection event return loss.
In one embodiment of the invention, loss acquisition module is additionally operable to when accessing device failure, according to public affairs Formula
Obtain the attenuation loss value A of decay events in faulty link, wherein access device is two level optical branching device or wiring Optical fiber or level-one optical branching device or trunk optical fiber, n are the Drop cable quantity that failure accesses that device is related to, R1iIndicate i-th of institute State the health value of the reflection event return loss for the Drop cable end being related to, R2iIndicate the Drop cable being related to described in i-th The fault value of the reflection event return loss of end.
The present invention passes through in the reflection event and PON ODN networks to Drop cable end formation in PON ODN networks The return loss measurement for the reflection event that optical branching device is formed is detected, and is compared with corresponding return loss health value, The position that can determine fibre circuit wear-out failure reduces O&M cost to improve O&M efficiency.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art With obtain other attached drawings according to these attached drawings.
Fig. 1 is the schematic diagram of the method one embodiment of the present invention for detecting PON network line fault.
Fig. 2 is the schematic diagram of method another embodiment of the present invention for detecting PON network line fault.
Fig. 3 is the schematic diagram of PON network circuit in one embodiment of the invention.
Fig. 4 is the schematic diagram of PON network circuit in another embodiment of the present invention.
The schematic diagram for the OTDR curves that Fig. 5 is formed when being PON network line fault in one embodiment of the invention.
Fig. 6 is the schematic diagram of method another embodiment of the present invention for detecting PON network line fault.
Fig. 7 is the schematic diagram of the device one embodiment of the present invention for detecting PON network line fault.
Fig. 8 is the schematic diagram of device another embodiment of the present invention for detecting PON network line fault.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below Description only actually at least one exemplary embodiment is illustrative, is never used as to the present invention and its application or makes Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments It is not limited the scope of the invention up to formula and numerical value.
Simultaneously, it should be appreciated that for ease of description, the size of attached various pieces shown in the drawings is not according to reality Proportionate relationship draw.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
In shown here and discussion all examples, any occurrence should be construed as merely illustrative, without It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that:Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined, then it need not be further discussed in subsequent attached drawing in a attached drawing.
Fig. 1 is the schematic diagram of the method one embodiment of the present invention for detecting PON network line fault.Preferably, originally Embodiment can be executed by the present invention for detecting the device of PON network line fault.This approach includes the following steps:
Step 101, the return loss value of OTDR reflection events in PON network is detected, wherein reflection event includes Drop cable end reflection event and optical branching device reflection event.
In one embodiment of the invention, before step 101, the method can also include:By OTDR to PON The return loss health value of each reflection event is detected and saves as health account in ODN networks.
Step 102, judge the difference of the return loss value and corresponding return loss health value of Drop cable end reflection event Whether value is more than first predetermined value.
Step 103, if the difference of the return loss value of Drop cable end reflection event and corresponding return loss health value More than first predetermined value, then judge that the return loss value of Drop cable end reflection event is abnormal;And it is anti-further directed to end The reflection event for penetrating the optical branching device belonging to the Drop cable of event return loss value exception judges that return loss value is returned with corresponding Whether the difference that health value is lost in wave is more than second predetermined value.
Step 104, if the return loss value in the reflection event of the affiliated optical branching device of Drop cable and corresponding return loss The difference of health value is not more than second predetermined value, then judges the corresponding Drop cable of the return loss value exception of end reflection event Wear-out failure occurs.
Based on the method for detecting PON network line fault that the above embodiment of the present invention provides, by PON ODN The reflection event that optical branching device is formed in Drop cable end is formed in network reflection event and PON ODN networks returns Wave loss measurement is detected, and is compared with corresponding return loss health value, can easily determine that fibre circuit is decayed Location of fault reduces O&M cost to improve O&M efficiency.
Fig. 2 is the schematic diagram of method another embodiment of the present invention for detecting PON network line fault.Preferably, originally Embodiment can be executed by the present invention for detecting the device of PON network line fault.This approach includes the following steps:
Step 201, the return loss value of OTDR reflection events in PON network is measured in real time, wherein reflection event Including Drop cable end reflection event and optical branching device reflection event.
Step 202, judge whether the return loss value of Drop cable end reflection event is abnormal, that is, judge Drop cable Whether the return loss value of end reflection event and the difference of corresponding return loss health value are more than first predetermined value.If registering one's residence light The return loss value of fine end reflection event and the difference of corresponding return loss health value are more than first predetermined value, then follow the steps 204;Otherwise, if the difference of the return loss value of Drop cable end reflection event and corresponding return loss health value is no more than the One predetermined value, thens follow the steps 203.
Step 203, wear-out failure does not occur for judgement optical fiber link, no longer executes other steps of the present embodiment later.
Step 204, the return loss value of judgement Drop cable end reflection event is abnormal;And further directed to return loss It is worth the reflection event of the abnormal affiliated optical branching device of Drop cable, judges the difference of return loss value and corresponding return loss health value Whether value is more than second predetermined value (that is, it is judged that whether the reflection event return loss value of the affiliated optical branching device of Drop cable is different Often).If the difference of the return loss value and corresponding return loss health value in the reflection event of the affiliated optical branching device of Drop cable No more than second predetermined value, 205 are thened follow the steps;Otherwise, if echo in the reflection event of the affiliated optical branching device of Drop cable Loss value and the difference of corresponding return loss health value are more than second predetermined value, then follow the steps 206.
Step 205, wear-out failure occurs for the corresponding Drop cable of judgement end reflection event return loss value exception, later No longer execute other steps of the present embodiment.
Step 206, further judge whether the affiliated optical branching device of Drop cable is level-one optical branching device.If Drop cable institute Category optical branching device is level-one optical branching device, that is, testing fiber link is the optical fiber for only including level-one optical branching device as shown in Figure 3 Link thens follow the steps 208;Otherwise, if the affiliated optical branching device of Drop cable is two level optical branching device, that is, testing fiber link For the optical fiber link for including level-one optical branching device and two level optical branching device as shown in Figure 4,207 are thened follow the steps.
Step 207, judge whether the reflection event return loss value of the affiliated level-one optical branching device of two level optical branching device is abnormal, That is, it is judged that the return loss value and corresponding return loss in the reflection event of level-one optical branching device belonging to two level optical branching device are strong Whether the difference of health value is more than third predetermined value.If the return loss value in the reflection event of level-one optical branching device and corresponding echo The difference that health value is lost is more than third predetermined value, thens follow the steps 208;Otherwise, if in the reflection event of level-one optical branching device The difference of return loss value and corresponding return loss health value be not more than third predetermined value, then follow the steps 209.
Step 208, judge that wear-out failure occurs for level-one optical branching device failure or trunk optical fiber, no longer execute this reality later Apply other steps of example.
Step 209, judge that wear-out failure occurs for two level optical branching device failure or Distribution fibers.
The above embodiment of the present invention passes through the reflection event and PON to Drop cable end formation in PON ODN networks The return loss measurement of reflection event that optical branching device is formed in ODN networks is detected, and with corresponding return loss health value It is compared, not only can easily determine that wear-out failure occurs for the fibre circuit comprising level-one optical branching device as shown in Figure 3 Position, can also easily determine it is as shown in Figure 4 include level-one, two level optical branching device fibre circuit wear-out failure occurs Position reduce O&M cost to improve O&M efficiency.
In one embodiment of the invention, after the step 205 of the step 104 of Fig. 1 embodiments or Fig. 2 embodiments, The method can also include:If wear-out failure occurs for Drop cable, according to formula
A=(R1-R2)/2 (1)
Obtain attenuation loss the value A, wherein R of decay events in faulty link1Indicate the health of reflection event return loss Value, R2Indicate the fault value of reflection event return loss.
The above embodiment of the present invention can by PON ODN networks Drop cable end formed reflection event, with And the return loss measurement of reflection event that optical branching device is formed in PON ODN networks is detected, and with corresponding return loss Health value is compared, and the position (Distribution fibers or Drop cable) of fibre circuit wear-out failure is easily determined, to improve O&M efficiency, reduces O&M cost;The loss value of wear-out failure event in relational link can also be determined simultaneously.
In one embodiment of the invention, after the step 208 of Fig. 2 embodiments or 209, the method can also wrap It includes:If device failure is accessed, according to formula
Obtain the attenuation loss value A of decay events in faulty link, wherein access device is two level optical branching device or wiring Optical fiber or level-one optical branching device or trunk optical fiber, n are the Drop cable quantity that failure accesses that device is related to, R1iIndicate i-th of institute State the health value of the reflection event return loss for the Drop cable end being related to, R2iIndicate the Drop cable being related to described in i-th The fault value of the reflection event return loss of end.
In one embodiment of the invention, the attenuation loss value A of decay events in faulty link is obtained according to formula (2) The step of may include:
Step 1, according to formula
The attenuation loss value A that each Drop cable that device is related to obtains is accessed by failure to obtaini, wherein 1≤i ≤n。
Step 2, according to formula
To AiIt averages, obtains the final attenuation loss value A of decay events in faulty link.
In addition, being detected compared to existing OLT/ONU both-ends luminous power, the measurement of return loss value proposed by the present invention is accurate Height, and stability is good.Meanwhile for existing OLT/ONU both-ends luminous power detect, once ONU power down, it is not online when can not read ONU optical modules transmission/received optical power, not enough detection datas are for fault measuring and diagnosis.And the present invention then no matter The whether online return loss values that can detect reflection event of ONU
In addition, for existing reflectivity detection method, OTDR sampling resolutions directly affect reflection event peak reflection The accuracy of detection of rate.And the present invention calculates return loss difference and asks then by the measurement of the existing return loss of reflection event Average detection method, precision is higher and does not depend on and the high performance sampling resolutions of OTDR.
In one embodiment of the invention, in the step 204 of the step 103 of Fig. 1 embodiments or Fig. 2 embodiments, sentencing After being incorporated into the return loss value exception of family fiber end reflections event, the method can also include:
Judge whether the quantity of the Drop cable end reflection event of return loss value exception is more than 1.
If the quantity of the Drop cable end reflection event of return loss value exception is 1, it is directed to the Drop cable end The reflection event of affiliated optical branching device, execution judge whether return loss value and the difference of corresponding return loss health value are more than The step of second predetermined value.
In one embodiment of the invention, the method can also include:
If the quantity of the Drop cable end reflection event of return loss value exception is more than 1, further to return loss The Drop cable end reflection event of value exception is grouped, wherein in the same reflection event group, belonging to Drop cable Optical branching device is identical;
It is unique for this if in group only including a Drop cable end reflection event for each reflection event group Drop cable end belonging to optical branching device reflection event, execution judge return loss value and corresponding return loss health value Difference whether be more than second predetermined value the step of.
In one embodiment of the invention, the method can also include:If in group including at least two Drop cables End reflection event, then be directed to the reflection event of the common affiliated optical branching device in Drop cable end in the group, and execution judges back The step of whether wave loss value and the difference of corresponding return loss health value are more than second predetermined value.
The above embodiment of the present invention is by being grouped abnormal Drop cable end reflection event, for belonging to same light The Drop cable of splitter, carry out it is primary belonging to optical branching device reflection event whether abnormal judgement, so as to avoid for every A exception Drop cable end reflection event, all carry out belonging to optical branching device reflection event whether abnormal judgement, into one Step improves O&M efficiency, reduces O&M cost.
Method below by specific example to the present invention for detecting PON network line fault illustrates:
Fig. 5 is described when OTDR carries out PON ODN network optical link fault detects, and the OTDR curves of formation pass through OTDR tracing analysis, each Drop cable end and optical branching device can form a reflection event.The OTDR curves of Fig. 5 are illustrated In figure, including the 1st level-one optical branching device, 4 two level optical branching devices and multiple Drop cable ends (being connected to ONU terminals) The reflection event of formation.The present invention is exactly the detection and analysis by these reflection event return losses, carries out optical fiber link The measurement and diagnosis of failure.
Fig. 6 describes to carry out Drop cable end and optical branching device in PON ODN network fiber links and forms reflection thing Part carries out return loss detection, and for the flow of optical fiber link fault measuring and diagnosis.In conjunction with Fig. 6 and specific embodiment to this Invention is described in further detail.The present invention carries out the specific steps that PON ODN network fiber link failures are measured and diagnosed Including:
Step S601, it is scanned using OTDR pairs one normal PON ODN network, detects and preserve each and register one's residence Optical fiber connector forms the return loss and each optical branching device (including level-one optical branching device and secondary light point of reflection event Road device) formed reflection event return loss health value, as health account.The health account needs periodic maintenance, once There is new branch optical fiber access to need to re-start optical fiber link scanning, the reflection event for forming newly-increased branch optical fiber end Return loss health value is detected and is saved in health account.
Step S602, actively whether monitoring optical fiber link occurs wear-out failure to OTDR in real time, or passes through subscriber complaint quilt Whether the dynamic optical fiber link of monitoring in real time occurs wear-out failure.If monitoring, wear-out failure occurs for PON ODN network fiber links, Execute step S604;Otherwise, if monitoring, wear-out failure does not occur for PON ODN network fiber links, thens follow the steps S603.
Step S603, Drop cable end reflection event and optical branching device reflection event return loss value, healthy shelves are carried out The maintenance of case no longer executes other steps of the present embodiment later.
Step S604, optical fiber link scanning is carried out using OTDR again, detects each Drop cable end and forms reflection Event and each optical branching device form reflection event, record and preserve the return loss value of each reflection event.
Step S605, the reflection event return loss value for preserving fault detect, echo damage corresponding with health account Consumption health value is compared, and carries out the fault diagnosis of optical fiber link.
Step S606, according to the comparison result of step S605, if only Drop cable end forms reflection event all the way Return loss value obviously increases, and the return loss that the road Drop cable upper level optical branching device forms reflection event does not have Anomalous variation (such as in specific example shown in fig. 5, only all the way the ends Drop cable OUN#2 formed reflection event echo Loss value has significant change), then follow the steps 607.
Step S607, it is diagnosed as the Drop cable link section and wear-out failure occurs;The wear-out failure is obtained by formula (1) The loss value of event no longer executes other steps of the present embodiment later.
Step S608, according to the comparison result of step S605, if there is multichannel Drop cable end to form returning for reflection event Wave loss value obviously increases, and the multichannel Drop cable belongs to a Distribution fibers branch, the Distribution fibers branch Two level optical branching device forms reflection event return loss value and apparent exception occurs, then step 609;If conversely, Distribution fibers branch Two level optical branching device form reflection event return loss value apparent exception do not occur, then be diagnosed as multiple Drop cable sections and exist Wear-out failure draws when specific fault point may be that multiple Drop cables are drawn in an optical cable from optical fiber distributing box in optical cable Go out section generation wear-out failure to cause multiple Drop cables in the optical cable while wear-out failure occurs.
Step S609, being diagnosed as the Distribution fibers section, there are wear-out failures;The wear-out failure event is obtained by formula (2) Loss value, later no longer execute the present embodiment other steps.
Step S610, according to the comparison result of step S605, if there is multichannel Drop cable end to form returning for reflection event Wave loss value obviously increases, and the multichannel Drop cable belongs to different Distribution fibers branches, thens follow the steps 611.
Step S611, it is respectively compared the echo damage that the affiliated two level optical branching device of each Distribution fibers branch forms reflection event Whether consumption value obviously increases.If obviously increasing, S612 is thened follow the steps.
Step S612, judge whether that the two level optical branching device of all Distribution fibers branches forms the return loss of reflection event Value is apparent abnormal.If the return loss value that the two level optical branching device of all Distribution fibers branches forms reflection event is apparent different Often, S615 is thened follow the steps;Otherwise, if the two level optical branching device of above-mentioned Distribution fibers branch forms the return loss of reflection event Value is only that individual generations are apparent abnormal, thens follow the steps S613.
Step S613, individual Distribution fibers sections are diagnosed as, wear-out failure occurs, and individual Drop cable sections decay Failure.
Step S614, when wear-out failure occurs for individual Distribution fibers sections, then the loss value of wear-out failure event can lead to Cross formula (2) acquisition;When wear-out failure occurs for individual Drop cable sections, then the damage of these Drop cable section wear-out failure events Consumption value A can be obtained by formula (1).Other steps of the present embodiment are no longer executed later.
Step S615, judge whether the return loss value of level-one optical branching device reflection event occurs significant change.If level-one Significant change occurs for the return loss value of optical branching device reflection event, thens follow the steps S616;Otherwise, if level-one optical branching device is anti- Significant change does not occur for the return loss value for penetrating event, thens follow the steps S617.
Step S616, it is diagnosed as level-one optical branching device failure or wear-out failure occurs for trunk optical fiber, execute step later S618。
Step S617, these Distribution fibers sections are diagnosed as, wear-out failure or the level-one light of Distribution fibers connection occurs There are failures for the output port of splitter.
Step S618, the loss value of wear-out failure event can be obtained by formula (2).
In one embodiment of the invention, in step S605, the reflection event return loss value that fault detect preserves, with The step of corresponding return loss health value is compared in health account may include:
Judge whether the difference of the return loss value and corresponding return loss health value of Drop cable end reflection event is big In first predetermined value.If the return loss value of Drop cable end reflection event and the difference of corresponding return loss health value are more than First predetermined value then judges that the return loss of Drop cable end reflection event is obviously abnormal.
Judge whether return loss value and the difference of corresponding return loss health value are more than second predetermined value.If Drop cable The difference of return loss value and corresponding return loss health value in the reflection event of affiliated optical branching device is more than second predetermined value, Then the reflection event return loss of the affiliated optical branching device of Drop cable is obviously abnormal.
Judge the return loss value in the reflection event of the level-one optical branching device belonging to two level optical branching device and corresponding echo Whether the difference that health value is lost is more than third predetermined value.If the return loss value in the reflection event of level-one optical branching device and phase The difference of return loss health value is answered to be more than third predetermined value, then the reflection event return loss of level-one optical branching device is obviously different Often.
The above embodiment of the present invention can by PON ODN networks Drop cable end formed reflection event, with And the return loss measurement of reflection event that optical branching device is formed in PON ODN networks is detected, and with corresponding return loss Health value is compared, and the position (Distribution fibers or Drop cable) of fibre circuit wear-out failure is easily determined, to improve O&M efficiency, reduces O&M cost.
The above embodiment of the present invention can also easily determine the loss value of wear-out failure event in relational link;The present invention Return loss value measures accurate height, and stability is good;The present invention no matter the whether online echoes that can detect reflection event of ONU Loss value;The present invention then by the measurement of the existing return loss of reflection event, calculates the inspection of return loss difference and averaging Survey method, precision is higher and does not depend on and the high performance sampling resolutions of OTDR.
Fig. 7 is the schematic diagram of the device one embodiment of the present invention for detecting PON network line fault.As shown in fig. 7, It is described for detect the device of PON network line fault to include OTDR modules 701, the first identification module 702, the second identification module 703 and fault determination module 704, wherein:
OTDR modules 701 are detected for the return loss value to OTDR reflection events in PON network, wherein reflecting Event includes Drop cable end reflection event and optical branching device reflection event.
First identification module 702, for judging that the return loss value of Drop cable end reflection event is damaged with corresponding echo Whether the difference for consuming health value is more than first predetermined value.
Second identification module 703, for the judging result according to the first identification module 702, in Drop cable end reflection When the return loss value of event and the difference of corresponding return loss health value are more than first predetermined value, judgement Drop cable end is anti- The return loss value for penetrating event is abnormal, and the reflection of the affiliated optical branching device of Drop cable further directed to return loss value exception Event, judges whether return loss value and the difference of corresponding return loss health value are more than second predetermined value.
Fault determination module 704, for the judging result according to the second identification module 703, in the affiliated light of Drop cable point The difference of return loss value and corresponding return loss health value in the reflection event of road device is not more than second predetermined value, then judges Wear-out failure occurs for Drop cable.
Based on the device for detecting PON network line fault that the above embodiment of the present invention provides, by PON ODN The reflection event that optical branching device is formed in Drop cable end is formed in network reflection event and PON ODN networks returns Wave loss measurement is detected, and is compared with corresponding return loss health value, can easily determine that fibre circuit is decayed Location of fault reduces O&M cost to improve O&M efficiency.
Fig. 8 is the schematic diagram of device another embodiment of the present invention for detecting PON network line fault.Shown in Fig. 7 Embodiment is compared, and in the embodiment shown in fig. 8, described device can also include third identification module 801, wherein:
Third identification module 801, for the judging result according to the second identification module 703, in the affiliated light of Drop cable point When the difference of return loss value and corresponding return loss health value in the reflection event of road device is more than second predetermined value, further Judge whether the affiliated optical branching device of Drop cable is level-one optical branching device.
Fault determination module 704 is additionally operable to the judging result according to third identification module 801, in the affiliated light of Drop cable point When road device is level-one optical branching device, judge that wear-out failure occurs for level-one optical branching device failure or trunk optical fiber.
In one embodiment of the invention, as shown in figure 8, described device can also include the 4th identification module 802, In:
4th identification module 802, for the judging result according to third identification module 801, in the affiliated light of Drop cable point When road device is two level optical branching device, returning in the reflection event of the level-one optical branching device belonging to two level optical branching device is further judged Whether wave loss value and the difference of corresponding return loss health value are more than third predetermined value.
Fault determination module 704 is additionally operable to the judging result according to the 4th identification module 802, in the anti-of level-one optical branching device When the difference of the return loss value penetrated in event and corresponding return loss health value is more than third predetermined value, level-one optical branching is judged Wear-out failure occurs for device failure or trunk optical fiber.
In one embodiment of the invention, fault determination module 704 is additionally operable to the judgement according to the 4th identification module 802 As a result, the difference of return loss value in the reflection event of level-one optical branching device and corresponding return loss health value is no more than the When three predetermined values, judge that wear-out failure occurs for two level optical branching device failure or Distribution fibers.
The above embodiment of the present invention passes through the reflection event and PON to Drop cable end formation in PON ODN networks The return loss measurement of reflection event that optical branching device is formed in ODN networks is detected, and with corresponding return loss health value It is compared, not only can easily determine that wear-out failure occurs for the fibre circuit comprising level-one optical branching device as shown in Figure 3 Position, can also easily determine it is as shown in Figure 4 include level-one, two level optical branching device fibre circuit wear-out failure occurs Position reduce O&M cost to improve O&M efficiency.
In one embodiment of the invention, as shown in figure 8, described device can also include the 5th identification module 803, In:
5th identification module 803, the echo damage for judging Drop cable end reflection event in the second identification module 703 After consumption value exception, judge whether the quantity of the Drop cable end reflection event of return loss value exception is more than 1.
Second identification module 703 is specifically used for the judging result according to the 5th identification module 803, in return loss value exception The quantity of Drop cable end reflection event when being 1, for the reflection event of the optical branching device belonging to the Drop cable end, Execute the operation for judging whether return loss value is more than second predetermined value with the difference of corresponding return loss health value.
In one embodiment of the invention, as shown in figure 8, described device can also include grouping module 804, wherein:
Grouping module 804, according to the judging result of the 5th identification module 803, in the Drop cable of return loss value exception When the quantity of end reflection event is more than 1, further the Drop cable end reflection event of return loss value exception is divided Group, wherein in the same reflection event group, the optical branching device belonging to Drop cable is identical.
Second identification module 703 is specifically used for for each reflection event group, only includes a Drop cable end in group When holding reflection event, for the reflection event of the optical branching device belonging to unique Drop cable end, execution judges that echo damages Whether consumption value is more than the operation of second predetermined value with the difference of corresponding return loss health value.
In one embodiment of the invention, the second identification module 703 is specifically used for registering one's residence including at least two in group When fiber end reflections event, for the reflection event of the common affiliated optical branching device in Drop cable end in the group, execution is sentenced Whether disconnected return loss value is more than the operation of second predetermined value with the difference of corresponding return loss health value.
The above embodiment of the present invention is by being grouped abnormal Drop cable end reflection event, for belonging to same light The Drop cable of splitter, carry out it is primary belonging to optical branching device reflection event whether abnormal judgement, so as to avoid for every A exception Drop cable end reflection event, all carry out belonging to optical branching device reflection event whether abnormal judgement, into one Step improves O&M efficiency, reduces O&M cost.
In one embodiment of the invention, as shown in figure 8, described device can also include loss acquisition module 805, In:
Acquisition module 805 is lost, for when wear-out failure occurs for Drop cable, faulty link to be obtained according to formula (1) Attenuation loss the value A, wherein R of middle decay events1Indicate the health value of reflection event return loss, R2Indicate reflection event echo The fault value of loss.
The above embodiment of the present invention can by PON ODN networks Drop cable end formed reflection event, with And the return loss measurement of reflection event that optical branching device is formed in PON ODN networks is detected, and with corresponding return loss Health value is compared, and the position (Distribution fibers or Drop cable) of fibre circuit wear-out failure is easily determined, to improve O&M efficiency, reduces O&M cost;The loss value of wear-out failure event in relational link can also be determined simultaneously.
In one embodiment of the invention, loss acquisition module 805 is additionally operable to when accessing device failure, according to Formula (2) obtains the attenuation loss value A of decay events in faulty link, wherein access device is two level optical branching device or wiring Optical fiber or level-one optical branching device or trunk optical fiber, n are the Drop cable quantity that failure accesses that device is related to, R1iIndicate i-th of institute State the health value of the reflection event return loss for the Drop cable end being related to, R2iIndicate the Drop cable being related to described in i-th The fault value of the reflection event return loss of end.
In one embodiment of the invention, loss acquisition module 805 may include that loss acquiring unit and mean value obtain Unit, wherein:
Acquiring unit is lost, for according to formula
The attenuation loss value A that each Drop cable that device is related to obtains is accessed by failure to obtaini, wherein 1≤i ≤n。
Mean value acquiring unit, for according to formula
By to AiIt averages, obtains the final attenuation loss value A of decay events in faulty link.
It is detected compared to existing OLT/ONU both-ends luminous power, return loss value proposed by the present invention measures accurate high and stable Property is good.Meanwhile existing OLT/ONU both-ends luminous power is detected, it can not read ONU optical modules when ONU power down is not online Transmission/received optical power, not enough detection datas are for fault measuring and diagnosis.And the present invention then no matter ONU whether Line can detect the return loss value of reflection event
In addition, for existing reflectivity detection method, OTDR sampling resolutions directly affect reflection event peak reflection The accuracy of detection of rate.And the present invention calculates return loss difference and asks then by the measurement of the existing return loss of reflection event Average detection method, precision is higher and does not depend on and the high performance sampling resolutions of OTDR.
First identification module 702, the second identification module 703 and fault determination module 704 described above, third are known The functions lists such as other module 801, the 4th identification module 802, the 5th identification module 803, grouping module 804, loss acquisition module 805 Member can be implemented as general processor, programmable logic controller (PLC) (PLC), number letter for executing function described in the invention Number processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic devices Part, discrete gate either transistor logic, discrete hardware components or it is arbitrary appropriately combined.
So far, the present invention is described in detail.In order to avoid the design of the masking present invention, it is public that this field institute is not described Some details known.Those skilled in the art as described above, can be appreciated how to implement technology disclosed herein completely Scheme.
One of ordinary skill in the art will appreciate that realizing that all or part of step of above-described embodiment can pass through hardware It completes, relevant hardware can also be instructed to complete by program, the program can be stored in a kind of computer-readable In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
Description of the invention provides for the sake of example and description, and is not exhaustively or will be of the invention It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage Various embodiments with various modifications of the solution present invention to design suitable for special-purpose.

Claims (18)

1. a kind of method for detecting PON network line fault, which is characterized in that including:
The return loss value of OTDR reflection events in PON network is detected, wherein reflection event includes Drop cable end Reflection event and optical branching device reflection event;
Judge whether the difference of the return loss value of Drop cable end reflection event and corresponding return loss health value is more than the One predetermined value;
If it is predetermined that the difference of the return loss value of Drop cable end reflection event and corresponding return loss health value is more than first Value then judges that the return loss value of Drop cable end reflection event is abnormal, and enters further directed to return loss value is abnormal The reflection event of the affiliated optical branching device of family optical fiber, judges whether return loss value and the difference of corresponding return loss health value are more than Second predetermined value;
If the difference of the return loss value and corresponding return loss health value in the reflection event of the affiliated optical branching device of Drop cable No more than second predetermined value, then judge that wear-out failure occurs for Drop cable.
2. according to the method described in claim 1, it is characterized in that, further including:
If the difference of the return loss value and corresponding return loss health value in the reflection event of the affiliated optical branching device of Drop cable More than second predetermined value, then further judge whether the affiliated optical branching device of Drop cable is level-one optical branching device;
If the affiliated optical branching device of Drop cable is level-one optical branching device, level-one optical branching device failure or trunk optical fiber hair are judged Raw wear-out failure.
3. according to the method described in claim 2, it is characterized in that, further including:
If the affiliated optical branching device of Drop cable is two level optical branching device, the level-one light belonging to two level optical branching device is further judged Whether the difference of return loss value and corresponding return loss health value in the reflection event of splitter is more than third predetermined value;
If the difference of the return loss value and corresponding return loss health value in the reflection event of level-one optical branching device is more than third Predetermined value then judges that wear-out failure occurs for level-one optical branching device failure or trunk optical fiber.
4. according to the method described in claim 3, it is characterized in that, further including:
If the difference of return loss value in the reflection event of level-one optical branching device and corresponding return loss health value is no more than the Three predetermined values then judge that wear-out failure occurs for two level optical branching device failure or Distribution fibers.
5. according to the method described in claim 1, it is characterized in that,
After the return loss value exception for judging Drop cable end reflection event, further include:
Judge whether the quantity of the Drop cable end reflection event of return loss value exception is more than 1;
If the quantity of the Drop cable end reflection event of return loss value exception is 1, belonging to the Drop cable end Optical branching device reflection event, whether execute the difference for judging return loss value and corresponding return loss health value more than second The step of predetermined value.
6. according to the method described in claim 5, it is characterized in that, further including:
If the quantity of the Drop cable end reflection event of return loss value exception is more than 1, further different to return loss value Normal Drop cable end reflection event is grouped, wherein in the same reflection event group, the light point belonging to Drop cable Road device is identical;
For each reflection event group, if only including a Drop cable end reflection event in group, uniquely enter for this The reflection event of optical branching device belonging to the optical fiber connector of family executes the difference for judging return loss value and corresponding return loss health value The step of whether value is more than second predetermined value.
7. according to the method described in claim 6, it is characterized in that, further including:
If in group including at least two Drop cable end reflection events, for Drop cable end in the group it is common belonging to The reflection event of optical branching device executes and judges whether the difference of return loss value and corresponding return loss health value is more than second in advance The step of definite value.
8. according to the described method of any one of claim 1-7, which is characterized in that further include:
If wear-out failure occurs for Drop cable, according to formula
A=(R1-R2)/2
Obtain attenuation loss the value A, wherein R of decay events in faulty link1Indicate the health value of reflection event return loss, R2 Indicate the fault value of reflection event return loss.
9. according to the method described in claim 8, it is characterized in that, further including:
If device failure is accessed, according to formula
Obtain the attenuation loss value A of decay events in faulty link, wherein access device is two level optical branching device or Distribution fibers Or level-one optical branching device or trunk optical fiber, n are the Drop cable quantity that failure accesses that device is related to, R1iIt is related to described in indicating i-th And Drop cable end reflection event return loss health value, R2iIndicate the Drop cable end being related to described in i-th Reflection event return loss fault value.
10. a kind of device for detecting PON network line fault, which is characterized in that including OTDR modules, the first identification mould Block, the second identification module and fault determination module, wherein:
OTDR modules are detected for the return loss value to OTDR reflection events in PON network, and wherein reflection event includes Drop cable end reflection event and optical branching device reflection event;
First identification module, the return loss value for judging Drop cable end reflection event and corresponding return loss health value Difference whether be more than first predetermined value;
Second identification module, for the judging result according to the first identification module, in the echo of Drop cable end reflection event When loss value and the difference of corresponding return loss health value are more than first predetermined value, judgement Drop cable end reflection event is returned Wave loss value is abnormal, and the reflection event of the affiliated optical branching device of Drop cable further directed to return loss value exception, judges Whether the difference of return loss value and corresponding return loss health value is more than second predetermined value;
Fault determination module, for the judging result according to the second identification module, in the reflection of the affiliated optical branching device of Drop cable The difference of return loss value and corresponding return loss health value in event is not more than second predetermined value, then judges that Drop cable is sent out Raw wear-out failure.
11. device according to claim 10, which is characterized in that further include third identification module, wherein:
Third identification module, for the judging result according to the second identification module, in the reflection of the affiliated optical branching device of Drop cable When the difference of return loss value and corresponding return loss health value in event is more than second predetermined value, light of registering one's residence further is judged Whether optical branching device belonging to fibre is level-one optical branching device;
Fault determination module is additionally operable to the judging result according to third identification module, is level-one in the affiliated optical branching device of Drop cable When optical branching device, judge that wear-out failure occurs for level-one optical branching device failure or trunk optical fiber.
12. according to the devices described in claim 11, which is characterized in that further include the 4th identification module, wherein:
4th identification module is two level in the affiliated optical branching device of Drop cable for the judging result according to third identification module When optical branching device, further judge return loss value in the reflection event of the level-one optical branching device belonging to two level optical branching device and Whether the difference of corresponding return loss health value is more than third predetermined value;
Fault determination module is additionally operable to the judging result according to the 4th identification module, in the reflection event of level-one optical branching device When the difference of return loss value and corresponding return loss health value is more than third predetermined value, judge level-one optical branching device failure or Wear-out failure occurs for trunk optical fiber.
13. device according to claim 12, which is characterized in that
Fault determination module is additionally operable to the judging result according to the 4th identification module, in the reflection event of level-one optical branching device When the difference of return loss value and corresponding return loss health value is not more than third predetermined value, judgement two level optical branching device failure, Or wear-out failure occurs for Distribution fibers.
14. device according to claim 10, which is characterized in that further include the 5th identification module, wherein:
5th identification module, the return loss value for judging Drop cable end reflection event in the second identification module are abnormal Afterwards, judge whether the quantity of the Drop cable end reflection event of return loss value exception is more than 1;
Second identification module is specifically used for the judging result according to the 5th identification module, in the Drop cable of return loss value exception When the quantity of end reflection event is 1, for the reflection event of the optical branching device belonging to the Drop cable end, execution judges back Whether wave loss value is more than the operation of second predetermined value with the difference of corresponding return loss health value.
15. device according to claim 14, which is characterized in that further include grouping module, wherein:
Grouping module, according to the judging result of the 5th identification module, in the Drop cable end reflection thing of return loss value exception When the quantity of part is more than 1, further the Drop cable end reflection event of return loss value exception is grouped, wherein same In one reflection event group, the optical branching device belonging to Drop cable is identical;
Second identification module is specifically used for for each reflection event group, only includes a Drop cable end reflection thing in group When part, for the reflection event of the optical branching device belonging to unique Drop cable end, execution judges return loss value and phase Answer whether the difference of return loss health value is more than the operation of second predetermined value.
16. device according to claim 15, which is characterized in that
Second identification module is specifically used in group when including at least two Drop cable end reflection events, for entering in the group The reflection event of optical branching device belonging to family optical fiber connector is common, execution judge return loss value and corresponding return loss health value Difference whether be more than second predetermined value operation.
17. according to the device described in any one of claim 10-16, which is characterized in that further include loss acquisition module, In:
Acquisition module is lost, is used for when wear-out failure occurs for Drop cable, according to formula
A=(R1-R2)/2
Obtain attenuation loss the value A, wherein R of decay events in faulty link1Indicate the health value of reflection event return loss, R2 Indicate the fault value of reflection event return loss.
18. device according to claim 17, which is characterized in that
Loss acquisition module is additionally operable to when accessing device failure, according to formula
Obtain the attenuation loss value A of decay events in faulty link, wherein access device is two level optical branching device or Distribution fibers Or level-one optical branching device or trunk optical fiber, n are the Drop cable quantity that failure accesses that device is related to, R1iIt is related to described in indicating i-th And Drop cable end reflection event return loss health value, R2iIndicate the Drop cable end being related to described in i-th Reflection event return loss fault value.
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