CN102281100B - Long method and the device realizing light path detection in EPON - Google Patents
Long method and the device realizing light path detection in EPON Download PDFInfo
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- CN102281100B CN102281100B CN201010206678.7A CN201010206678A CN102281100B CN 102281100 B CN102281100 B CN 102281100B CN 201010206678 A CN201010206678 A CN 201010206678A CN 102281100 B CN102281100 B CN 102281100B
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Abstract
The invention discloses a kind of long method and device realizing light path detection in EPON (PON), the present invention extends box for boundary with light, detection path is divided into trunk optical fiber and branch optical fiber two-way, and respectively the light path of trunk optical fiber and the light path of branch optical fiber is detected.By the inventive method, overcome light and extend box to the blocking-up of OTDR signal, compensate for the additional optical loss that Long haul fibers brings simultaneously, thus meet whole long demand of carrying out light path detection apart from PON.
Description
Technical Field
The present invention relates to an optical network system, and in particular, to a method and an apparatus for implementing optical path detection in a long distance Passive Optical Network (PON).
Background
The rapid development and low cost requirement of the wired broadband access technology has promoted the development of gradually replacing the existing copper wire (wired) system by adopting optical fiber, i.e. the trend of optical copper feeding and optical copper withdrawing has become a trend. Meanwhile, the characteristics of the most wide, fastest and environmentally friendly passive optical network, and the characteristics of the long-distance passive optical network such as flattening and simplifying the network structure, adapting to a longer-distance network structure, and reducing the investment cost are being accepted by most operators and are beginning to be deployed or prepared to meet the increasing communication users and the faster and better service requirements.
The long-distance PON is a point-to-multipoint optical fiber access technology. Fig. 1 is a schematic structural diagram of a conventional long-distance passive optical network, and as shown in fig. 1, the conventional long-distance passive optical network includes an Optical Line Terminal (OLT), an Optical Network Unit (ONU), and an Optical Distribution Network (ODN). Generally, one OLT is connected to a point-to-multipoint structure formed by a plurality of ONUs through an optical delay box (RE box, reachextendedbox, also called long-distance box) and an optical power splitter (optical splitter) of the ODN, as shown in fig. 1.
Because the optical extension box of the long-distance PON has a function of blocking signals of an Optical Time Domain Reflectometer (OTDR) and extra optical loss caused by a long-distance optical fiber, the existing optical path detection scheme for the PON uses an OTDR light source or an OTDR instrument to rapidly detect the whole PON at one time, which is not suitable for a long-distance passive optical network, that is, the original detection method needs some adjustment to detect the optical path of the whole long-distance PON.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method and an apparatus for implementing optical path detection in a long-distance passive optical network, which can overcome the blocking of an optical delay box to an OTDR signal, and compensate for extra optical loss caused by a long-distance optical fiber, so as to meet the optical path detection requirement of a long-distance PON.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for realizing optical path detection in a long-distance Passive Optical Network (PON) comprises the following steps:
by taking an optical extension box as a boundary, dividing a detection path into two paths of a main optical fiber and a branch optical fiber by adding an interface of an Optical Time Domain Reflectometer (OTDR) near the optical extension box, or adding an optical transmitter of the OTDR near the optical extension box, or adding an optical module of the OTDR near the optical extension box;
and respectively carrying out optical path detection on the main optical fiber and the branch optical fiber.
For the detection mode of adding an OTDR interface near the optical add box, the optical path detection on the trunk fiber and the branch fiber respectively is as follows:
and detecting the optical path of the branch optical fiber behind the optical extension box from the interface of the OTDR by adopting an OTDR instrument.
For the detection mode of the optical transmitter by adding OTDR near the optical add box, the optical path detection for the trunk fiber and the branch fiber respectively is as follows:
an optical line terminal OLT controls the OTDR optical transmitter through the optical extension box, and a signal of the OTDR optical transmitter is coupled into an optical splitter; the reflected signal of the OTDR optical transmitter bypasses the optical extension box to enter the trunk fiber and then is transmitted to the OTDR instrument at the OLT.
For the detection mode of the optical module by adding OTDR near the optical add box, the optical path detection for the trunk fiber and the branch fiber respectively is as follows:
the OLT controls the OTDR optical module through the optical extension box, and a signal of the OTDR optical module is coupled into an optical splitter; and after the reflected signal of the OTDR optical module returns to the OTDR optical module and is processed, the OTNT signal is transmitted back to the OLT through the EONT of the optical delay box.
The method further comprises the following steps: at the OLT, an OTDR instrument at the OLT is used to couple OTDR signals into the optical fiber, so as to implement optical path detection of the trunk optical fiber between the OLT and the optical extension box.
An apparatus for implementing optical path detection in a long distance passive optical network, PON, comprising at least an optical extension box, an OTDR instrument or an OTDR optical transmitter or an OTDR optical module arranged near said optical extension box, and an OTDR instrument arranged at an OLT, wherein,
the OTDR instrument or OTDR optical transmitter or OTDR optical module is arranged near the optical extension box and is used for dividing a detection path into two paths of a trunk optical fiber and a branch optical fiber by taking the optical extension box as a boundary and carrying out optical path detection on the branch optical fiber; and the OTDR instrument is arranged at the OLT and is used for carrying out optical path detection on the main optical fiber.
In the case of an OTDR instrument placed near the optical extension box, the apparatus further comprises a wavelength division multiplexing filter, placed between the optical extension box and the optical splitter, for coupling signals of the OTDR and separating reflected signals of the OTDR instrument near the optical extension box from the main signal stream;
the C interface of the wavelength division multiplexing filter is connected with an optical splitter, the P interface of the wavelength division multiplexing filter is connected with the optical extension box, and the R interface of the wavelength division multiplexing filter is an OTDR interface of the OTDR instrument.
Under the condition that an OTDR optical transmitter is arranged near the optical extension box, the device also comprises a first wavelength division multiplexing filter, a second wavelength division multiplexing filter and an optical circulator; wherein,
the OTDR optical transmitter is used for providing a detection light source for carrying out optical path detection on the branch optical fiber behind the optical extension box; receiving a detection starting instruction sent by the OLT through the optical extension box, and outputting a detection signal to a first interface of the optical circulator;
the first wavelength division multiplexing filter is used for receiving a reflected signal from the optical circulator, outputting the reflected signal to the main optical fiber from a C interface of the first wavelength division multiplexing filter, and transmitting the reflected signal to an OTDR instrument at the OLT;
the second wavelength division multiplexing filter is used for receiving the detection signal from the optical circulator and outputting the detection signal to the optical splitter from a C interface of the second wavelength division multiplexing filter to enter the branch optical fiber to reach the ONU; the C interface of the second wavelength division multiplexing filter receives the reflected signal of the OTDR optical transmitter of the branch optical fiber and outputs the reflected signal to the second interface of the optical circulator from the R interface of the second wavelength division multiplexing filter;
the optical circulator is used for receiving the detection signal from the OTDR optical transmitter and outputting the detection signal to an R interface of the second wavelength division multiplexing filter from a second interface of the optical circulator; and receiving the reflected signal from the second wavelength division multiplexing filter, and outputting the reflected signal from the third interface of the second wavelength division multiplexing filter to the R interface of the first wavelength division multiplexing filter.
Under the condition that an OTDR optical module is arranged near the optical extension box, the device also comprises a wavelength division multiplexing filter and a data processing module; wherein,
the data processing module is used for receiving a test starting command and sending a test instruction to the OTDR optical module; and the optical extension box is used for analyzing and processing the obtained data and sending the result to the OLT through the EONT of the optical extension box;
the OTDR optical module is used for outputting the received detection signal to an R interface of the wavelength division multiplexing filter; receiving the reflected signal from the wavelength division multiplexing filter and outputting the reflected signal to a data processing module;
the wavelength division multiplexing filter is used for outputting the received detection signal from the OTDR optical module to the optical splitter and the branch optical fiber from the C interface of the wavelength division multiplexing filter; and the C interface of the wavelength division multiplexing filter receives the reflected signal of the OTDR of the branch optical fiber and enters the OTDR optical module from the R interface of the C interface.
The device also includes: and the coupler is arranged at the OLT and used for connecting the OTDR instrument at the OLT to the trunk optical fiber so as to complete the optical path detection of the trunk optical fiber between the OLT and the optical extension box.
The wavelength division multiplexing filter is a sideband filter, is used for transmitting the wavelengths below 1620nm and transmitting the wavelengths above 1625nm, and has a safety isolation band of 5 nm.
According to the technical scheme provided by the invention, the optical length detection device takes the optical extension box as a boundary, divides the detection path into two paths of the trunk optical fiber and the branch optical fiber, and respectively detects the optical path of the trunk optical fiber and the branch optical fiber. The method of the invention overcomes the blocking of the OTDR signal by the optical extension box, and simultaneously compensates the extra optical loss caused by the long-distance optical fiber, thereby satisfying the optical path detection requirement of the long-distance PON and realizing the optical path detection of the whole PON network.
Drawings
Fig. 1 is a schematic structural diagram of a conventional long-distance passive optical network;
fig. 2 is a flowchart of a method for implementing optical path detection in a long-distance passive optical network according to the present invention;
fig. 3 is a schematic structural diagram illustrating a first embodiment of an apparatus for implementing optical path detection in a long-distance passive optical network according to the present invention;
fig. 4 is a schematic structural diagram illustrating a second embodiment of an apparatus for implementing optical path detection in a long-distance passive optical network according to the present invention;
fig. 5 is a schematic structural diagram of a third embodiment of an apparatus for implementing optical path detection in a long-distance passive optical network according to the present invention.
Detailed Description
Fig. 2 is a flowchart of a method for implementing optical path detection in a long-distance passive optical network according to the present invention, as shown in fig. 2, including:
step 200: the detection path is divided into two paths of main optical fiber and branch optical fiber by taking the optical extension box as a boundary.
In this step, the detection path may be divided into two paths, i.e., a trunk fiber and a branch fiber, by adding an OTDR interface near the optical extension box, or adding an OTDR optical transmitter near the optical extension box, or adding an OTDR optical module near the optical extension box. The specific implementation can be seen in the description of fig. 3-5 below.
Step 201: and respectively carrying out optical path detection on the main optical fiber and the branch optical fiber.
Step 202: the detection data or signals of the branch optical fibers can be transmitted to the OLT by an OTDR instrument or through the main optical fiber, and the OLT integrates the detection results of the main optical fiber and the branch optical fibers to complete the optical path detection of the whole long-distance passive optical network.
After the path division in step 200 is performed, coupling an OTDR signal into an optical fiber at the OLT by using an OTDR instrument at the OLT, and blocking a signal for optical path detection in front of the optical extension box, thereby implementing optical path detection on a trunk optical fiber between the OLT and the optical extension box; for the optical path detection of the branch optical fiber after the optical extension box, the following methods can be adopted corresponding to different detection modes:
for the detection mode of adding an OTDR interface near the optical extension box, an OTDR instrument performs optical path detection on the branch optical fiber behind the optical extension box from the OTDR interface;
or, for a detection mode of adding an OTDR optical transmitter near the optical extension box, the OLT controls the OTDR optical transmitter through the optical extension box, a signal of the OTDR optical transmitter is coupled into the optical splitter, and a reflected signal of the OTDR optical transmitter bypasses the optical extension box to enter the trunk optical fiber and then is transmitted to the OTDR instrument at the OLT, thereby implementing optical path detection of the branch optical fiber behind the optical extension box by the OLT; or,
for the detection mode of the optical module by adding the OTDR near the optical extension box, the OLT controls the OTDR optical module through the optical extension box, the signal of the OTDR optical module is coupled into the optical splitter, and the reflected signal of the OTDR optical module is returned to the OTDR optical module and processed, and then is transmitted back to the OLT through an Embedded Optical Network Terminal (EONT) of the optical extension box, thereby realizing the optical path detection of the branch optical fiber after the optical extension box is subjected to the OLT.
For the method of the invention, an arrangement is provided, comprising at least an optical extension box, an OTDR instrument or OTDR optical transmitter or OTDR optical module arranged in the vicinity of said optical extension box, and an OTDR instrument arranged at the OLT, wherein,
the OTDR instrument or OTDR optical transmitter or OTDR optical module is arranged near the optical extension box and is used for dividing a detection path into two paths of a trunk optical fiber and a branch optical fiber by taking the optical extension box as a boundary and carrying out optical path detection on the branch optical fiber; and the OTDR instrument is arranged at the OLT and is used for carrying out optical path detection on the main optical fiber. The following describes in detail the apparatuses of different detection modes.
Fig. 3 is a schematic structural diagram illustrating a first embodiment of an apparatus for implementing optical path detection in a long-distance passive optical network according to the present invention, as shown in fig. 3, the apparatus at least includes an optical extension box and a wavelength division multiplexing filter, wherein,
a wavelength division multiplexing filter, which is arranged between the optical delay box and the optical splitter, wherein a C interface of the wavelength division multiplexing filter is connected with an interface (S '/R') of the optical splitter (indicated in conjunction with fig. 1), a P interface of the wavelength division multiplexing filter is connected with the optical delay box, and an R interface of the wavelength division multiplexing filter is an OTDR interface and is used for coupling OTDR signals and separating reflected signals of the OTDR instrument from main signal streams.
The wavelength division multiplexing filter is designed in relation to the wavelength selection of the OTDR, where the wavelength division multiplexing filter may be a sideband filter which is transparent for wavelengths below 1620nm and transparent for wavelengths above 1625nm, and which has a 5nm safety isolation band.
The first embodiment of the device according to the invention shown in fig. 3 operates on the principle: the OTDR instrument is connected in the manner of fig. 3, and the OTDR instrument is turned on to perform optical path detection (also referred to as fault detection) on the branch optical fiber between the optical extension box and the ONU. In addition, at the OLT, the OTDR instrument may be connected to the trunk fiber by using a coupler, so that optical path detection of the trunk fiber between the OLT and the optical extension box (not shown in fig. 3, shown in fig. 1) may be completed, which belongs to the known technology of those skilled in the art, and the specific implementation connection manner is not described herein again.
By the detection of the first embodiment, the overall optical path detection of the entire long-distance PON is completed. In the apparatus shown in the first embodiment, only one passive light guide device, that is, a wavelength division multiplexing filter, needs to be added, but the apparatus shown in the first embodiment cannot perform all optical path detection on the long-distance PON at the local OLT, and can perform all optical path detection on the long-distance PON by performing two detections at the OLT and the optical delay box, respectively, and integrating the results of the two detections. The scheme has minimal system changes.
Fig. 4 is a schematic structural diagram illustrating a second embodiment of an apparatus for implementing optical path detection in a long-distance passive optical network according to the present invention, as shown in fig. 4, the apparatus at least includes an optical delay box, an OTDR optical transmitter, a first wavelength division multiplexing filter, a second wavelength division multiplexing filter, and an optical circulator, wherein,
and the OTDR optical transmitter is used for providing a detection light source when the optical path detection is carried out on the branch optical fiber behind the optical extension box.
The OTDR optical transmitter obtains a power supply through the optical extension box, and the OLT manages and controls the OTDR optical transmitter through the optical extension box.
When the OTDR optical transmitter receives a detection instruction of the OLT, a signal of the OTDR optical transmitter enters an interface 1 of the optical circulator, then enters an interface R of the second wavelength division multiplexing filter from an interface 2 of the optical circulator, and then enters the optical splitter and the branch optical fiber from an interface C of the second wavelength division multiplexing filter; and the reflected signal of the OTDR optical transmitter is connected to the R interface through the C interface of the second wavelength division multiplexing filter, the interface 2 to the interface 3 of the optical circulator and the R interface of the first wavelength division multiplexing filter are connected to the optical path formed by the C interface, bypass the optical extension box, enter the main optical fiber and are finally transmitted to the OTDR instrument at the OLT.
And the first wavelength division multiplexing filter is used for establishing an interface for a detection signal of the branch optical fiber to bypass the optical extension box and be transmitted back to an optical path on the OTDR instrument at the OLT without influencing a normal optical communication channel. Therefore, the C interface of the first wavelength division multiplexing filter is connected with the (R '/S') interface of the main optical fiber, the P interface of the first wavelength division multiplexing filter is connected with one end of the optical extension box, and the R interface of the first wavelength division multiplexing filter is connected with the interface 3 of the optical circulator.
The second wavelength division multiplexing filter is used for coupling the signal of the OTDR optical transmitter into the branch optical fiber; the reflected signal of the OTDR optical transmitter is separated from the main stream signal. The C interface of the second wavelength division multiplexing filter is connected with the (S '/R') interface of the optical splitter, the P interface of the second wavelength division multiplexing filter is connected with the other end of the optical extension box, and the R interface of the second wavelength division multiplexing filter is connected with the optical circulator interface 2.
The wavelength division multiplex filter is designed in relation to the selection of the wavelength of the OTDR, where the first and second wavelength division multiplex filters may each be a sideband filter which is transmissive for wavelengths below 1620nm and above 1625nm and which has a 5nm safety isolation band.
And the optical circulator is used for introducing the OTDR optical transmitter into the second wavelength division multiplexing filter and simultaneously guiding a reflection signal of the OTDR optical transmitter to the first wavelength division multiplexing filter. An interface 2 of the optical circulator is connected with an R interface of the second wavelength division multiplexing filter, an interface 1 of the optical circulator is connected with the OTDR optical transmitter, and an interface 3 of the optical circulator is connected with an R interface of the first wavelength division multiplexing filter.
The apparatus shown in fig. 4 constitutes three optical paths, and the first optical channel is a main optical path composed of a first wavelength division multiplexing filter, an optical add-drop box and a second wavelength division multiplexing filter, and is used for transmitting uplink and downlink light; the second optical channel is an optical path of a detection source of a branch optical fiber consisting of an OTDR optical transmitter, an optical circulator and a second wavelength division multiplexing filter and is used for leading the signal of the OTDR optical transmitter into the branch optical fiber to carry out optical path detection on the branch optical fiber; the third optical channel is a return loop of a reflected signal of the OTDR optical transmitter composed of the second wavelength division multiplexing filter, the optical circulator and the first wavelength division multiplexing filter, and is used for transmitting a detection signal of the branch optical fiber after the optical extension box to the OTDR instrument at the OLT through the trunk optical fiber.
The second embodiment of the apparatus shown in fig. 4 works on the principle that the optical path detection of the trunk fiber is performed by an OTDR instrument at the OLT, and the process is as described in the first embodiment shown in fig. 3, which is not described herein again.
The optical path detection of the branch optical fiber is realized by the device shown in fig. 4. Firstly, an OLT sends a detection starting instruction to an OTDR optical transmitter through an optical extension box, a detection signal of the OTDR optical transmitter enters from an interface 1 of an optical circulator, then is output to an interface R of a second wavelength division multiplexing filter from an interface 2 of the optical circulator, and then is output to an optical splitter from an interface C of the second wavelength division multiplexing filter to enter a branch optical fiber and reach an ONU; reflected signals of the OTDR optical transmitter of the branch optical fiber enter a C interface of a second wavelength division multiplexing filter from the optical splitter, are output to an optical circulator interface 2 from an R interface of the second wavelength division multiplexing filter, are output from an optical circulator interface 3 and enter an R interface of a first wavelength division multiplexing filter, are output to a main optical fiber from the C interface of the first wavelength division multiplexing filter, and reach an OTDR instrument at an OLT (optical time domain reflectometer) after being transmitted; and then the OTDR instrument processes the received signals of the branch optical fiber and the main optical fiber and transmits the processed signals to the OLT, and the OLT integrates the results to finish the optical path detection of the whole long-distance PON.
Through the apparatus of the second embodiment shown in fig. 4, the mode that two sets of detection devices are necessary for optical path detection of the original long-distance PON system or detection is performed at different places in two times is broken through, and the apparatus shown in fig. 4 enables an operator to automatically perform optical path detection and result processing on the entire long-distance PON system by using an OTDR instrument once at the office OLT, thereby greatly saving detection time and detection labor cost for the operator, and finally saving operation cost for the operator.
Fig. 5 is a schematic structural diagram illustrating a third embodiment of an apparatus for implementing optical path detection in a long-distance passive optical network according to the present invention, as shown in fig. 5, the apparatus at least includes an OTDR optical module, a data processing module, a wavelength division multiplexing filter, and an optical delay box, wherein,
the Optical Time Domain Reflectometer (OTDR) optical module is used for carrying out optical path detection on the branch optical fiber, the Optical Line Terminal (OLT) sends a detection starting instruction to the OTDR optical module through the optical extension box, a detection signal of the OTDR optical module is coupled into the optical splitter and the branch optical fiber through the wavelength division multiplexing filter, a reflection signal of the OTDR optical module returns to the optical module of the OTDR through the wavelength division multiplexing filter, the signal is transmitted to the OLT through an Ethernet On Nothing (EONT) of the optical extension box after being processed by the data processing module, and the OLT integrates the result and the detection result of the main optical fiber to finish the optical path detection of the whole long.
The data processing module is used for processing data of the reflected signals of the OTDR optical module and transmitting the processed result to the OLT through the local controller and the EONT via the trunk optical fiber. The data processing module in this embodiment may be omitted if the local controller in the optical extender box has sufficient additional data processing capacity.
And the wavelength division multiplexing filter is arranged between the optical splitter and the optical extension box and is used for coupling the signal of the OTDR optical module into the branch optical fiber and separating the reflected signal of the OTDR optical module from the main stream signal and leading the reflected signal back to the OTDR optical module. The C interface of the wavelength division multiplexing filter is connected with the (S '/R') interface of the optical splitter, the P interface of the wavelength division multiplexing filter is connected with the optical extension box, and the R interface of the wavelength division multiplexing filter is connected with the OTDR optical module.
The wavelength division multiplexing filter is designed in relation to the wavelength selection of the OTDR, where the wavelength division multiplexing filter may be a sideband filter which is transparent for wavelengths below 1620nm and transparent for wavelengths above 1625nm, and which has a 5nm safety isolation band.
The third embodiment of the device according to the invention shown in fig. 5 operates on the principle of: sending a test starting command to a data processing module at the optical extension box through the existing EONT of the optical extension box, sending a test command to an OTDR optical module connected with the data processing module, sending a detection signal to enter an R interface of a wavelength division multiplexing filter by the OTDR optical module, and then entering an optical splitter and a branch optical fiber from a C interface of the wavelength division multiplexing filter; then the reflected signal of the OTDR of the branch optical fiber enters the OTDR optical module through the C interface of the wavelength division multiplexing filter and the R interface by branching, and is transmitted to the data processing module, the module analyzes and processes the obtained data, and sends the result to the OLT through the EONT of the optical extension box. In addition, at the OLT, the OTDR instrument may be connected to the trunk fiber by using a coupler, so that optical path detection of the trunk fiber between the OLT and the optical extension box (not shown in fig. 5, shown in fig. 1) may be completed, which belongs to the known technology of those skilled in the art, and the specific implementation connection manner is not described herein again. Therefore, the OLT completes the optical path detection of the whole long-distance PON system by integrating the result and the data of the main optical fiber measured by the OTDR instrument.
The apparatus shown in fig. 5 has the highest degree of automation, and the optical path detection for the trunk fiber and the optical path detection for the branch fiber can be performed simultaneously, and the OTDR instrument does not need to be modified. With the apparatus of the third embodiment shown in fig. 5, the operator can perform complete optical path detection on the entire long-distance PON at the office OLT, and simultaneously, the OTDR signal of the branch optical fiber is well prevented from being damaged again by long-distance transmission. The detection time is greatly saved for the operator, the detection labor cost is saved, and finally, the operation cost is saved for the operator.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (11)
1. A method for realizing optical path detection in a long-distance Passive Optical Network (PON) is characterized by comprising the following steps:
dividing a detection path into two paths of a main optical fiber and a branch optical fiber by taking an optical extension box as a boundary and adding an interface of an Optical Time Domain Reflectometer (OTDR) near the optical extension box, or adding an optical transmitter of the OTDR near the optical extension box, or adding an optical module of the OTDR near the optical extension box, and performing optical path detection on the branch optical fiber;
at an optical line terminal OLT, coupling a signal of the OTDR into an optical fiber through an OTDR instrument at the OLT, and blocking a signal of optical path detection in front of the optical extension box, thereby implementing optical path detection on the trunk optical fiber between the OLT and the optical extension box.
2. The method of claim 1, wherein for the detection mode of the interface by adding OTDR near the optical add box, the optical path detection for the trunk fiber and the branch fiber respectively is as follows:
and detecting the optical path of the branch optical fiber behind the optical extension box from the interface of the OTDR by adopting an OTDR instrument.
3. The method of claim 1, wherein for the detection mode of the optical transmitter by adding OTDR near the optical extension box, the optical path detection for the trunk fiber and the branch fiber respectively is as follows:
an optical line terminal OLT controls the OTDR optical transmitter through the optical extension box, and a signal of the OTDR optical transmitter is coupled into an optical splitter; the reflected signal of the OTDR optical transmitter bypasses the optical extension box to enter the trunk fiber and then is transmitted to the OTDR instrument at the OLT.
4. The method of claim 1, wherein for the detection mode of the optical module by adding OTDR near the optical extension box, the optical path detection for the trunk fiber and the branch fiber respectively is as follows:
the OLT controls the OTDR optical module through the optical extension box, and a signal of the OTDR optical module is coupled into an optical splitter; and after the reflected signal of the OTDR optical module returns to the OTDR optical module and is processed, the OTNT signal is transmitted back to the OLT through the EONT of the optical delay box.
5. The method according to any one of claims 1 to 4, further comprising: at the OLT, an OTDR instrument at the OLT is used to couple OTDR signals into the optical fiber, so as to implement optical path detection of the trunk optical fiber between the OLT and the optical extension box.
6. An apparatus for implementing optical path detection in a long distance passive optical network, PON, comprising at least an optical extension box, an OTDR instrument or OTDR optical transmitter or OTDR optical module disposed near said optical extension box, and an OTDR instrument disposed at an OLT, wherein,
the OTDR instrument or OTDR optical transmitter or OTDR optical module is arranged near the optical extension box and is used for dividing a detection path into two paths of a trunk optical fiber and a branch optical fiber by taking the optical extension box as a boundary and carrying out optical path detection on the branch optical fiber; and the OTDR instrument is arranged at the OLT and is used for carrying out optical path detection on the main optical fiber.
7. The apparatus of claim 6,
in the case of an OTDR instrument placed near the optical extension box, the apparatus further comprises a wavelength division multiplexing filter, placed between the optical extension box and the optical splitter, for coupling signals of the OTDR and separating reflected signals of the OTDR instrument near the optical extension box from the main signal stream;
the C interface of the wavelength division multiplexing filter is connected with an optical splitter, the P interface of the wavelength division multiplexing filter is connected with the optical extension box, and the R interface of the wavelength division multiplexing filter is an OTDR interface of the OTDR instrument.
8. The apparatus of claim 6, wherein in the case where the OTDR optical transmitter is disposed near the optical extension box, the apparatus further comprises a first wavelength division multiplexing filter, a second wavelength division multiplexing filter, and an optical circulator; wherein,
the OTDR optical transmitter is used for providing a detection light source for carrying out optical path detection on the branch optical fiber behind the optical extension box; receiving a detection starting instruction sent by the OLT through the optical extension box, and outputting a detection signal to a first interface of the optical circulator;
the first wavelength division multiplexing filter is used for receiving a reflected signal from the optical circulator, outputting the reflected signal to the main optical fiber from a C interface of the first wavelength division multiplexing filter, and transmitting the reflected signal to an OTDR instrument at the OLT;
the second wavelength division multiplexing filter is used for receiving the detection signal from the optical circulator and outputting the detection signal to the optical splitter from a C interface of the second wavelength division multiplexing filter to enter the branch optical fiber to reach the ONU; the C interface of the second wavelength division multiplexing filter receives the reflected signal of the OTDR optical transmitter of the branch optical fiber and outputs the reflected signal to the second interface of the optical circulator from the R interface of the second wavelength division multiplexing filter;
the optical circulator is used for receiving the detection signal from the OTDR optical transmitter and outputting the detection signal to an R interface of the second wavelength division multiplexing filter from a second interface of the optical circulator; and receiving the reflected signal from the second wavelength division multiplexing filter, and outputting the reflected signal from the third interface of the second wavelength division multiplexing filter to the R interface of the first wavelength division multiplexing filter.
9. The apparatus of claim 6, wherein in the case where an OTDR optical module is disposed near the optical extension box, the apparatus further comprises a wavelength division multiplexing filter, and a data processing module; wherein,
the data processing module is used for receiving a test starting command and sending a test instruction to the OTDR optical module; and the optical extension box is used for analyzing and processing the obtained data and sending the result to the OLT through the EONT of the optical extension box;
the OTDR optical module is used for outputting the received detection signal to an R interface of the wavelength division multiplexing filter; receiving the reflected signal from the wavelength division multiplexing filter and outputting the reflected signal to a data processing module;
the wavelength division multiplexing filter is used for outputting the received detection signal from the OTDR optical module to the optical splitter and the branch optical fiber from the C interface of the wavelength division multiplexing filter; and the C interface of the wavelength division multiplexing filter receives the reflected signal of the OTDR of the branch optical fiber and enters the OTDR optical module from the R interface of the C interface.
10. The apparatus of any one of claims 6 to 9, further comprising: and the coupler is arranged at the OLT and used for connecting the OTDR instrument at the OLT to the trunk optical fiber so as to complete the optical path detection of the trunk optical fiber between the OLT and the optical extension box.
11. The apparatus according to claim 7 or 9,
the wavelength division multiplexing filter is a sideband filter, is used for transmitting the wavelengths below 1620nm and transmitting the wavelengths above 1625nm, and has a safety isolation band of 5 nm.
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| CN201010206678.7A CN102281100B (en) | 2010-06-12 | 2010-06-12 | Long method and the device realizing light path detection in EPON |
| PCT/CN2011/070983 WO2011153840A1 (en) | 2010-06-12 | 2011-02-15 | Method and apparatus for achieving optical line detection in long reach passive optical network |
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| WO2012095044A2 (en) * | 2012-02-21 | 2012-07-19 | 华为技术有限公司 | Optical transceiver module, passive optical network system, optical fiber detection method and system |
| CN103973361B (en) * | 2013-01-25 | 2016-12-28 | 中兴通讯股份有限公司 | The optical fiber fault detecting system of EPON and method |
| BR112013023723A2 (en) * | 2013-03-05 | 2016-12-13 | Ericsson Telecomunicações S A | optical amplifier array |
| CN106100746B (en) * | 2016-04-25 | 2018-05-15 | 海普林科技（武汉）有限公司 | A kind of test waves trunking and its control method for OTDR fiber laser arrays |
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| CN1866790A (en) * | 2005-11-16 | 2006-11-22 | 华为技术有限公司 | PON network design method using OTDR detection light path |
| CN101321022A (en) * | 2008-07-22 | 2008-12-10 | 电子科技大学 | Fiber Optic Network Sensing System |
| CN101414932A (en) * | 2007-10-15 | 2009-04-22 | 华为技术有限公司 | Method, system and apparatus managing alarm of long-distance passive optical network system |
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| CN101414932A (en) * | 2007-10-15 | 2009-04-22 | 华为技术有限公司 | Method, system and apparatus managing alarm of long-distance passive optical network system |
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