CN105577269B - A kind of light path detection method and device - Google Patents
A kind of light path detection method and device Download PDFInfo
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- CN105577269B CN105577269B CN201410555111.9A CN201410555111A CN105577269B CN 105577269 B CN105577269 B CN 105577269B CN 201410555111 A CN201410555111 A CN 201410555111A CN 105577269 B CN105577269 B CN 105577269B
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Abstract
The invention discloses a kind of light path detection method and devices, to solve the problems, such as that the accuracy of light path detection existing in the prior art is relatively low and precision is poor.This method includes：Receive the detection optical signal of different wave length；According to the detection optical signal of the different wave length received, multiple detection optical signal combinations are determined, wherein a detection optical signal is included at least in each detection optical signal combination；According to the splitting ratio for each detection optical signal setting, every optical network unit ONU branch into passive optical-fiber network PON sends a detection optical signal combination；The corresponding backscattering optical signal of detection optical signal for including is received during the detection optical signal received with itself that every ONU branch is fed back combines；According to the backscattering optical signal of the every ONU branch feedback received, the detection to every ONU branch is realized.
Description
Technical field
The present invention relates to technical field of photo communication more particularly to a kind of light path detection method and devices.
Background technology
Optical time domain reflectometer (Optical Time Domain Reflectometer, OTDR) is using light in optical fiber
The optoelectronic integration instrument of backscattering caused by Rayleigh scattering and Fresnel reflection when middle transmission and manufactured precision.It
Be widely used among the maintenance of lightguide cable link, construction, can carry out fiber lengths, the transmission attenuation of optical fiber, connector decaying and
The measurement of fault location etc..
In traditional passive optical-fiber network (Passive Optical Network, PON), OTDR uses specified wavelength
Signal the lightguide cable link in network is detected, specific system structure is as shown in Figure 1.
In the system shown in figure 1, OTDR is λ using wavelength1Signal carry out lightguide cable link detection.The work(of the signal
Rate according to the splitting ratio of optical splitter, is averaged distribution to each optical network unit after optical splitter (Splitter)
In (Optical Network Unit, ONU) branch.After the backscattering optical signal of each ONU branches converges at optical splitter, by
OTDR is received and is analyzed together.
The program has the following disadvantages：
1, the signal that OTDR is used is the signal of single wavelength, and all ONU branch in PON network are coupled to after optical splitter
Lu Zhong.When carrying out lightguide cable link detection, each ONU branches feed back back-scattering light simultaneously, and back-scattering light cannot be distinguished in OTDR
Source, to testing result can not being positioned to accurate ONU branches.
2, for the signal that OTDR is used after optical splitter, power is averaged distribution to each ONU branches.Under normal conditions, each ONU
Luminous power in branch is only the 1/128-1/32 of trunk power.Luminous power in each ONU branches directly affects back-scattering light
Power, cause the light path accuracy of detection of each ONU branches relatively low.
Invention content
A kind of light path detection method of offer of the embodiment of the present invention and device, to solve light path inspection existing in the prior art
The accuracy of survey is relatively low and the poor problem of precision.
The embodiment of the present invention uses following technical scheme：
An embodiment of the present invention provides a kind of light path detection methods, including：
Receive the detection optical signal of different wave length；
According to the detection optical signal of the different wave length received, multiple detection optical signal combinations are determined, wherein each detection
A detection optical signal is included at least in optical signal combination；
According to the splitting ratio for each detection optical signal setting, the every optical-fiber network list into passive optical-fiber network PON
First ONU branches send a detection optical signal combination；
The detection optical signal pair for including is received during the detection optical signal received with itself that every ONU branch is fed back combines
The backscattering optical signal answered；
According to the backscattering optical signal of the every ONU branch feedback received, the detection to every ONU branch is realized.
Optionally, the detection optical signal combination that every ONU branch into PON is sent is different；Then
According to the backscattering optical signal of the every ONU branch feedback received, the detection to each ONU branches is realized,
It specifically includes：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are failures
Backscattering optical signal when, determine characterization lightguide cable link there are the corresponding detection optical signal sets of the backscattering optical signal of failure
It closes；
Determining detection optical signal is combined into corresponding ONU branches and is determined as fault branch.
Optionally, the detection optical signal combination that every ONU branch into PON is sent is not exactly the same；Then
According to the backscattering optical signal of the every ONU branch feedback received, the detection to each ONU branches is realized,
It specifically includes：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are failures
Backscattering optical signal when, determine characterization lightguide cable link there are the corresponding detection optical signal sets of the backscattering optical signal of failure
It closes；
When it is one that determining detection optical signal, which combines corresponding ONU branches, this ONU branches are determined as failure branch
Road；
When it is at least two that determining detection optical signal, which combines corresponding ONU branches, from determining detection optical signal pair
Fault branch is determined in the ONU branches answered.
Optionally, when it is at least two that determining detection optical signal, which combines corresponding ONU branches, from determining detection light
Fault branch is determined in the corresponding ONU branches of signal, is specifically included：
Judge whether the difference of the physical length of the determining corresponding ONU branches of detection optical signal is less than predetermined threshold value；
When judging result is to be, corresponding backscattering optical signal is combined according to determining detection optical signal, and pre-
The network analysis information first obtained determines fault branch from the determining corresponding ONU branches of detection optical signal；
When judging result is no, corresponding backscattering optical signal is combined according to determining detection optical signal, and really
Fixed detection optical signal combines the reflected light signal generated based on the reflector plate in corresponding ONU branches, from determining detection
Fault branch is determined in the corresponding ONU branches of optical signal.
An embodiment of the present invention provides a kind of light path detecting devices, including：
Detection light signal receiving unit, the detection optical signal for receiving different wave length；
It detects optical signal and combines determination unit, for the detection optical signal according to the different wave length received, determine multiple
Detect optical signal combination, wherein a detection optical signal is included at least in each detection optical signal combination；
It detects optical signal and combines transmission unit, for according to the splitting ratio for each detection optical signal setting, to passive
Every optical network unit ONU branch in fiber optic network PON sends a detection optical signal combination；
Back-scattering light signal receiving unit, the detection light received with itself for receiving every ONU branch feedback
The corresponding backscattering optical signal of detection optical signal for including in signal combination；
Detection unit is realized for the backscattering optical signal according to the every ONU branch feedback received to every
The detection of ONU branches.
Optionally, the detection optical signal combination that every ONU branch of the detection optical signal combination transmission unit into PON is sent
It is different；Then
The detection unit, is specifically used for：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are failures
Backscattering optical signal when, determine characterization lightguide cable link there are the corresponding detection optical signal sets of the backscattering optical signal of failure
It closes；Determining detection optical signal is combined into corresponding ONU branches and is determined as fault branch.
Optionally, the detection optical signal combination that every ONU branch of the detection optical signal combination transmission unit into PON is sent
It is not exactly the same；Then
The detection unit, is specifically used for：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are failures
Backscattering optical signal when, determine characterization lightguide cable link there are the corresponding detection optical signal sets of the backscattering optical signal of failure
It closes；When it is one that determining detection optical signal, which combines corresponding ONU branches, this ONU branches are determined as fault branch；When
When the determining corresponding ONU branches of detection optical signal combination are at least two, from the determining corresponding ONU branches of detection optical signal
In determine fault branch.
Optionally, the detection unit, is specifically used for：
Judge whether the difference of the physical length of the determining corresponding ONU branches of detection optical signal is less than predetermined threshold value；
When judging result is to be, corresponding backscattering optical signal is combined according to determining detection optical signal, and pre-
The network analysis information first obtained determines fault branch from the determining corresponding ONU branches of detection optical signal；
When judging result is no, corresponding backscattering optical signal is combined according to determining detection optical signal, and really
Fixed detection optical signal combines the reflected light signal generated based on the reflector plate in corresponding ONU branches, from determining detection
Fault branch is determined in the corresponding ONU branches of optical signal.
The embodiment of the present invention has the beneficial effect that：
The embodiment of the present invention compared with prior art, generates the detection optical signal of multiple and different wavelength, then by difference
The detection optical signal of wavelength is combined, and after obtaining different detection optical signal combinations, every ONU branch into PON is sent
One detection optical signal combination, wherein including at least a detection optical signal in detection optical signal combination so that carrying out light path
When detection, the source of the backscattering optical signal received on the one hand can be identified, to navigate to accurately testing result
ONU branch road, on the other hand can also improve transmission power of each detection optical signal in corresponding ONU branches, Jin Erbao
The precision of light path detection is demonstrate,proved.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The purpose of the present invention and other advantages can be by the explanations write
Specifically noted structure is realized and is obtained in book, claims and attached drawing.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and constitutes the part of the present invention, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of light path detection in the prior art；
Fig. 2 is the principle process schematic diagram of light path detection method in the embodiment of the present invention；
Fig. 3 is in the embodiment of the present invention, in practical applications for realizing the system architecture schematic diagram of light path detection method；
Fig. 4 is the structural schematic diagram of light path detecting device in the embodiment of the present invention.
Specific implementation mode
In order to solve the problems, such as that the accuracy of light path detection existing in the prior art is relatively low and precision is poor, the present invention is real
It applies example and provides a kind of light path detection method and device.The technical solution compared with prior art, generates multiple and different wavelength
Optical signal is detected, then is combined by the detection optical signal to different wave length, after obtaining different detection optical signal combinations, to
Every ONU branch in PON sends a detection optical signal combination, wherein including at least a detection in detection optical signal combination
Optical signal so that when carrying out light path detection, it on the one hand can identify the source of the backscattering optical signal received, to
Testing result is navigated into accurate ONU branch road, on the other hand can also improve each detection optical signal in corresponding ONU branches
In transmission power, and then ensure that light path detection precision.
The embodiment of the present invention is illustrated below in conjunction with Figure of description, it should be understood that implementation described herein
Example is merely to illustrate and explain the present invention, and is not intended to restrict the invention.And in the absence of conflict, the reality in the present invention
Applying the feature of example and embodiment can be combined with each other.
An embodiment of the present invention provides a kind of light path detection methods, as shown in Fig. 2, for the principle flow chart of this method, tool
Body includes the following steps：
Step 21, the detection optical signal of different wave length is generated.
When it is implemented, the wavelength of the multiple detection optical signals generated should be non-traffic wavelength, to ensure detection light
The wavelength of signal can be relatively independent with service wavelength.
Step 22, according to the detection optical signal of the different wave length received, multiple detection optical signal combinations are determined；Wherein,
A detection optical signal is included at least in each detection optical signal combination.
Step 23, according to the splitting ratio for each detection optical signal setting, every light into passive optical-fiber network PON
Network element ONU branches send a detection optical signal combination.
It wherein, can be according to a detection optical signal combination when ONU branches into PON send detection optical signal combination
Only it is allocated by the principle that an ONU branch uses.But in some specific cases, for example, receive detection light letter
Number quantity than relatively limited, cause the quantity for the detection optical signal combination determined also than relatively limited, then a detection light letter
Number combination can also be used by a plurality of ONU branches.
Step 24, the detection that includes is received during the detection optical signal received with itself that every ONU branch is fed back combines
The corresponding backscattering optical signal of optical signal.
Step 25, it according to the backscattering optical signal of the every ONU branch feedback received, realizes to every ONU branch
Detection.
In the case where the detection optical signal combination that every ONU branch into PON is sent is different, step 25 can be with
But it is not limited to realize as follows：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are failures
Backscattering optical signal when, determine characterization lightguide cable link there are the corresponding detection optical signal sets of the backscattering optical signal of failure
It closes；
Determining detection optical signal is combined into corresponding ONU branches and is determined as fault branch.
In the case where the detection optical signal combination that every ONU branch into PON is sent is not exactly the same, step 25 can
With but be not limited to realize as follows：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are failures
Backscattering optical signal when, determine characterization lightguide cable link there are the corresponding detection optical signal sets of the backscattering optical signal of failure
It closes；
When it is one that determining detection optical signal, which combines corresponding ONU branches, this ONU branches are determined as failure branch
Road；
When it is at least two that determining detection optical signal, which combines corresponding ONU branches, from determining detection optical signal pair
Fault branch is determined in the ONU branches answered.
Typically, should not be identical using the physical length of the ONU branches of identical detection optical signal combination, in this way
Using the reflector plate being added in ONU branches, to realize the fault location of lightguide cable link；But if believed using identical detection light
The physical length of the ONU branches of number combination is identical or extremely close, then needs the analysis tool by system, such as failure hair
Birthday will realizes the fault location of lightguide cable link.
Therefore, when it is at least two that determining detection optical signal, which combines corresponding ONU branches, believe from determining detection light
Fault branch is determined in number corresponding ONU branches, can be, but not limited to realize as follows：
Judge whether the difference of the physical length of the determining corresponding ONU branches of detection optical signal is less than predetermined threshold value；
When judging result is to be, corresponding backscattering optical signal is combined according to determining detection optical signal, and pre-
The network analysis information first obtained determines fault branch from the determining corresponding ONU branches of detection optical signal；
When judging result is no, corresponding backscattering optical signal is combined according to determining detection optical signal, and really
Fixed detection optical signal combines the reflected light signal generated based on the reflector plate in corresponding ONU branches, from determining detection
Fault branch is determined in the corresponding ONU branches of optical signal.
Embodiment in order to better understand the present invention, below in conjunction with the specific specific implementation implemented to the embodiment of the present invention
Process illustrates.
As shown in figure 3, in practical applications for realizing the system architecture schematic diagram of light path detection method, to include mainly
OTDR, optical splitter and PON network.
Wherein, it needs to be provided with tunable laser in OTDR, the detection optical signal for generating different wave length, concurrently
Give optical splitter；And the backscattering optical signal of optical splitter feedback is received, light path detection is realized according to backscattering optical signal；
And optical splitter needs have the function that splitting ratio is arranged for different detection optical signals, when the inspection for receiving OTDR transmissions
After light signal, it is first determined multiple detection optical signal combinations, wherein include at least one in each detection optical signal combination
Optical signal is detected, then according to the splitting ratio for each detection optical signal setting, every ONU branch into PON sends one
A detection optical signal combination；And receive the backscattering optical signal of every ONU branch feedback.And feed back to OTDR.
When it is implemented, the wavelength for multiple detection optical signals that OTDR is generated using tunable laser should be non-
Service wavelength, to ensure that the wavelength of detection optical signal can be relatively independent with service wavelength.
Wherein, when the detection optical signal combination that every ONU branch when optical splitter into PON is sent is different, OTDR
It is specifically used for：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are failures
Backscattering optical signal when, determine characterization lightguide cable link there are the corresponding detection optical signal sets of the backscattering optical signal of failure
It closes；
Determining detection optical signal is combined into corresponding ONU branches and is determined as fault branch.
When the detection optical signal combination that every ONU branch of the optical splitter into PON is sent is not exactly the same, OTDR is specific
For：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are failures
Backscattering optical signal when, determine characterization lightguide cable link there are the corresponding detection optical signal sets of the backscattering optical signal of failure
It closes；
When it is one that determining detection optical signal, which combines corresponding ONU branches, this ONU branches are determined as failure branch
Road；
When it is at least two that determining detection optical signal, which combines corresponding ONU branches, determining detection optical signal is judged
Whether the difference of the physical length of corresponding ONU branches is less than predetermined threshold value；
When judging result is to be, corresponding backscattering optical signal is combined according to determining detection optical signal, and pre-
The network analysis information first obtained determines fault branch from the determining corresponding ONU branches of detection optical signal；
When judging result is no, corresponding backscattering optical signal is combined according to determining detection optical signal, and really
Fixed detection optical signal combines the reflected light signal generated based on the reflector plate in corresponding ONU branches, from determining detection
Fault branch is determined in the corresponding ONU branches of optical signal.
Light path detection method provided in an embodiment of the present invention is described in detail with reference to above system Organization Chart.
Assuming that PON network includes 8 ONU branches.
OTDR generates the detection optical signal of 4 different wave lengths, respectively λ using tunable laser1、λ2、λ3And λ4,
It is sent to optical splitter.
Optical splitter is to λ1、λ2、λ3And λ4Splitting ratio be configured, λ1Splitting ratio be 1:4, λ2And λ3Splitting ratio be 1:
3, λ4Splitting ratio be 1：2；
Determine different detection optical signal combinations, and each ONU branches into PON send a detection optical signal set
It closes.As shown in table 1 below, it is the correspondence of detection optical signal combination and ONU branches in the embodiment of the present invention.
Table 1：
| ONU branches | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Detect optical signal combination | λ1 | λ2 | λ3 | λ4 | λ1λ2 | λ1λ3 | λ1λ4 | λ2λ3 |
Reference table 1 only includes a detection optical signal in the detection optical signal combination that ONU branches 1-4 is respectively allocated,
Include two detection optical signals in the detection optical signal combination that ONU branches 5-8 is respectively allocated.
It should be noted that in practical applications, the method for determination and the method for salary distribution of detection optical signal combination are not limited to
In above-mentioned example, can need to carry out self-defined setting according to the specific of system.
In this embodiment, since the detection optical signal combination being assigned in each ONU branches is unique, OTDR can be with
It receives and the backscattering optical signal of comparison different wave length, realization detects the lightguide cable link of ONU branches.Analysis and positioning.
For example, in practical operation, if λ1Lightguide cable link failure at corresponding back-scattering light characterization 1, the then event
Barrier can be by Primary Location in ONU branches 1,5,6 and 7.It need to only continue to judge λ at this time2、λ3And λ4Backscattering optical signal
If λ2There is lightguide cable link failure in same location in corresponding back-scattering light characterization, then failure can be positioned
In ONU branches 5；If λ3There is lightguide cable link failure in corresponding back-scattering light characterization same location, then failure can quilt
It is positioned at ONU branches 6；And so on, the same fault that the back-scattering light characterization of different wave length is extracted by algorithm is believed
Breath, system can orient fault branch.
Under above application scene, optical splitter should be independently of for the setting of the splitting ratio of the service signal of bearer service
The splitting ratio for detecting optical signal, to ensure that service signal and detection optical signal can be relatively independent.In addition, point of detection optical signal
Light ratio should not be too large, and to provide larger power, ensure the accuracy of detection of ONU branches.
When carrying out light path detection using this system, if necessary to be detected to specific several ONU branches, then it can incite somebody to action
Tunable laser in OTDR is adjusted to specific wavelength and carries out aimed detection.In addition, the system can also provide ONU branches
Light path health condition full scan, i.e., the tunable laser in OTDR is adjusted to different wave length successively, and distribute to ONU
Branch.
Based on same inventive concept, a kind of light path detecting device is also each provided in the embodiment of the present invention, due to above-mentioned
The principle that device solves the problems, such as is similar to the method detected to light path, therefore above-mentioned apparatus is implemented to may refer to the implementation of method,
Overlaps will not be repeated.
As shown in figure 4, for the structural schematic diagram of light path detecting device provided in an embodiment of the present invention, including：
Detection light signal receiving unit 41, the detection optical signal for receiving different wave length；
It detects optical signal and combines determination unit 42, for the detection optical signal according to the different wave length received, determination is more
A detection optical signal combination, wherein a detection optical signal is included at least in each detection optical signal combination；
It detects optical signal and combines transmission unit 43, for according to the splitting ratio for each detection optical signal setting, Xiang Wu
Every optical network unit ONU branch in the fiber optic network PON of source sends a detection optical signal combination；
Back-scattering light signal receiving unit 44, the detection received with itself for receiving every ONU branch feedback
The corresponding backscattering optical signal of detection optical signal for including in optical signal combination；
Detection unit 45 is realized for the backscattering optical signal according to the every ONU branch feedback received to every
The detection of ONU branches.
Optionally, the detection optical signal set that every ONU branch of the detection optical signal combination transmission unit 42 into PON is sent
It closes different；Then
The detection unit 45, is specifically used for：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are failures
Backscattering optical signal when, determine characterization lightguide cable link there are the corresponding detection optical signal sets of the backscattering optical signal of failure
It closes；Determining detection optical signal is combined into corresponding ONU branches and is determined as fault branch.
Optionally, the detection optical signal set that every ONU branch of the detection optical signal combination transmission unit 42 into PON is sent
It closes not exactly the same；Then
The detection unit 45, is specifically used for：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are failures
Backscattering optical signal when, determine characterization lightguide cable link there are the corresponding detection optical signal sets of the backscattering optical signal of failure
It closes；When it is one that determining detection optical signal, which combines corresponding ONU branches, this ONU branches are determined as fault branch；When
When the determining corresponding ONU branches of detection optical signal combination are at least two, from the determining corresponding ONU branches of detection optical signal
In determine fault branch.
Further, the detection unit 45, is specifically used for：
Judge whether the difference of the physical length of the determining corresponding ONU branches of detection optical signal is less than predetermined threshold value；
When judging result is to be, corresponding backscattering optical signal is combined according to determining detection optical signal, and pre-
The network analysis information first obtained determines fault branch from the determining corresponding ONU branches of detection optical signal；
When judging result is no, corresponding backscattering optical signal is combined according to determining detection optical signal, and really
Fixed detection optical signal combines the reflected light signal generated based on the reflector plate in corresponding ONU branches, from determining detection
Fault branch is determined in the corresponding ONU branches of optical signal.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, the present invention can be used in one or more wherein include computer usable program code computer
The computer program production implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of light path detection method, which is characterized in that including：
Receive the detection optical signal of different wave length；
According to the detection optical signal of the different wave length received, multiple detection optical signal combinations are determined, wherein each detection light letter
Number combination in include at least one detection optical signal；
According to the splitting ratio for each detection optical signal setting, every optical network unit ONU into passive optical-fiber network PON
Branch sends a detection optical signal combination；
It is corresponding that the detection optical signal for including is received during the detection optical signal received with itself that every ONU branch is fed back combines
Backscattering optical signal；
According to the backscattering optical signal of the every ONU branch feedback received, the detection to every ONU branch is realized；
Wherein, the detection optical signal combination that every ONU branch into PON is sent is not exactly the same；It is then every according to receiving
The backscattering optical signal of ONU branches feedback, realizes the detection to each ONU branches, specifically includes：As every received
In the backscattering optical signal of ONU branches feedback, there is characterization lightguide cable link there are when the backscattering optical signal of failure, determine
Characterizing lightguide cable link, there are the corresponding detection optical signal combinations of the backscattering optical signal of failure；When determining detection optical signal set
Close corresponding ONU branches be one when, this ONU branches are determined as fault branch；When determining detection optical signal combination pair
When the ONU branches answered are at least two, fault branch is determined from the determining corresponding ONU branches of detection optical signal.
2. the method as described in claim 1, which is characterized in that the detection optical signal set that every ONU branch into PON is sent
It closes different；Then
According to the backscattering optical signal of the every ONU branch feedback received, the detection to each ONU branches is realized, specifically
Including：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are the back ofs the body of failure
When to scattered light signal, determining characterization lightguide cable link, there are the corresponding detection optical signal combinations of the backscattering optical signal of failure；
Determining detection optical signal is combined into corresponding ONU branches and is determined as fault branch.
3. the method as described in claim 1, which is characterized in that be when determining detection optical signal combines corresponding ONU branches
At at least two, determines fault branch from the determining corresponding ONU branches of detection optical signal, specifically include：
Judge whether the difference of the physical length of the determining corresponding ONU branches of detection optical signal is less than predetermined threshold value；
When judging result is to be, corresponding backscattering optical signal is combined according to determining detection optical signal, and obtain in advance
The network analysis information taken determines fault branch from the determining corresponding ONU branches of detection optical signal；
When judging result is no, corresponding backscattering optical signal is combined according to determining detection optical signal, and determine
Detection optical signal combines the reflected light signal generated based on the reflector plate in corresponding ONU branches, believes from determining detection light
Fault branch is determined in number corresponding ONU branches.
4. a kind of light path detecting device, which is characterized in that including：
Detection light signal receiving unit, the detection optical signal for receiving different wave length；
It detects optical signal and combines determination unit, for the detection optical signal according to the different wave length received, determine multiple detections
Optical signal combines, wherein a detection optical signal is included at least in each detection optical signal combination；
It detects optical signal and combines transmission unit, for basis for the splitting ratio of each detection optical signal setting, to passive fiber
Every optical network unit ONU branch in network PON sends a detection optical signal combination；
Back-scattering light signal receiving unit, the detection optical signal received with itself for receiving every ONU branch feedback
The corresponding backscattering optical signal of detection optical signal for including in combination；
Detection unit is realized for the backscattering optical signal according to the every ONU branch feedback received to every ONU branch
The detection on road；
Wherein, the detection optical signal combination that every ONU branch into PON is sent is not exactly the same；It is then every according to receiving
The backscattering optical signal of ONU branches feedback, realizes the detection to each ONU branches, specifically includes：As every received
In the backscattering optical signal of ONU branches feedback, there is characterization lightguide cable link there are when the backscattering optical signal of failure, determine
Characterizing lightguide cable link, there are the corresponding detection optical signal combinations of the backscattering optical signal of failure；When determining detection optical signal set
Close corresponding ONU branches be one when, this ONU branches are determined as fault branch；When determining detection optical signal combination pair
When the ONU branches answered are at least two, fault branch is determined from the determining corresponding ONU branches of detection optical signal.
5. device as claimed in claim 4, which is characterized in that every ONU of the detection optical signal combination transmission unit into PON
The detection optical signal combination that branch is sent is different；Then
The detection unit, is specifically used for：
In the backscattering optical signal of the every ONU branch feedback received, there is characterization lightguide cable link, there are the back ofs the body of failure
When to scattered light signal, determining characterization lightguide cable link, there are the corresponding detection optical signal combinations of the backscattering optical signal of failure；
Determining detection optical signal is combined into corresponding ONU branches and is determined as fault branch.
6. device as claimed in claim 4, which is characterized in that the detection unit is specifically used for：
Judge whether the difference of the physical length of the determining corresponding ONU branches of detection optical signal is less than predetermined threshold value；
When judging result is to be, corresponding backscattering optical signal is combined according to determining detection optical signal, and obtain in advance
The network analysis information taken determines fault branch from the determining corresponding ONU branches of detection optical signal；
When judging result is no, corresponding backscattering optical signal is combined according to determining detection optical signal, and determine
Detection optical signal combines the reflected light signal generated based on the reflector plate in corresponding ONU branches, believes from determining detection light
Fault branch is determined in number corresponding ONU branches.
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| EP2690802A1 (en) * | 2011-03-23 | 2014-01-29 | Telnet Redes Inteligentes, S.A. | System for the certification of a passive optical network and for the detection of problems and faults in the last fibre legs |
| CN103560827A (en) * | 2013-10-18 | 2014-02-05 | 华为技术有限公司 | Fault detection method and device |
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| CN103620985A (en) * | 2011-06-10 | 2014-03-05 | 瑞典爱立信有限公司 | Pon supervisoion using otdr measurements |
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