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A method and system for locating a faulty branch in a passive optical network

A passive optical network and faulty branch technology, applied in the field of faulty branch location, can solve the problems of lack of faulty branch identification ability, loss of accurate fault location, etc.

Active Publication Date: 2020-09-22
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these products use reflective devices on each user branch to improve the OTDR's ability to monitor faults, they also lose the ability to accurately locate faults
Simply put, when the fiber lengths of user branches are basically the same or have a small difference, these OTDR-based monitoring systems lack the ability to identify faulty branches

Method used

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  • A method and system for locating a faulty branch in a passive optical network
  • A method and system for locating a faulty branch in a passive optical network
  • A method and system for locating a faulty branch in a passive optical network

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Embodiment 1

[0045] The embodiment of the present invention provides a method for locating a faulty branch in a passive optical network, which can effectively locate a faulty branch in a PON, and solve the problem that two or more branches with the same length cannot be located in a PON system problem. refer to figure 1 , after the PON completes the network deployment and starts operation, the location method of the faulty branch in the PON can be briefly summarized into four parts: acquiring data, parameter extraction, using the best support vector machine to calculate and faulty branch location, that is, steps 201- Step 204.

[0046] Wherein, in order to determine the optimal support vector machine, after the PON network is deployed and before the actual operation, the support vector machine needs to be trained in advance to obtain the optimal support vector machine. Therefore, the complete positioning method can be divided into two steps, first is support vector machine training after...

Embodiment 2

[0069] On the basis of the above-mentioned embodiment 1, the embodiment of the present invention also provides a faulty branch location system in a passive optical network, which can be used to implement the faulty branch location method described in embodiment 1, and solve the problem in the PON system. Two or more branches of the same length cannot be fault located.

[0070] Such as Figure 5 As shown, the faulty branch location system in the passive optical network provided by the embodiment of the present invention includes an optical time domain reflectometer OTDR, and an optical line terminal (optical line terminal, abbreviated as OLT), a circulator, and an optical splitter connected in sequence. and at least two optical network units (ONU for short), the optical time domain reflectometer is connected to the circulator. Specifically, the entire system can be divided into three parts: the central office, optical distribution network (ODN for short) and the user end. The ...

specific Embodiment approach

[0078] combine Figure 5 In the PON structure shown, it is assumed that there are four branches in the PON, and the lengths of branch 1 and branch 2 are the same. Embodiments of the present invention further provide a specific implementation of faulty branch location, including the following steps:

[0079] Step 1: Disconnect the connection between branch 1 and OUN1, use OTDR to measure the curve relationship between loss and distance, and save it as discrete data; disconnect branch 2 and OUN1, use OTDR to measure the loss and distance The curve relationship between branch 3 and OUN1 is disconnected, and the curve relationship between loss and distance is measured by OTDR, which is stored as discrete data; the connection between branch 4 and OUN1 is disconnected, and the The curve relationship between loss and distance is obtained by OTDR measurement, which is stored as discrete data; the connection between branch 1 and OUN1 is disconnected, and the connection between branch 2...

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Abstract

The invention relates to the technical field of optical fiber communication. The invention particularly relates to a method and a system for positioning a fault branch in a passive optical network. The method comprises the following steps: before operation after PON networking, training a support vector machine to obtain an optimal support vector machine, and after PON operation is started, obtaining a curve relation between loss and distance in a PON branch through an optical time domain reflectometer, and storing the curve relation as discrete data; reading characteristic parameters capableof reflecting whether a branch fault occurs or not from the discrete data; importing the characteristic parameters into an optimal support vector machine for calculation; and positioning the fault branch in the PON according to the calculation result of the optimal support vector machine. On the premise that no additional device or auxiliary device is introduced, the fault branch in the PON is effectively positioned by combining the trained optimal support vector machine, and the problem that fault positioning cannot be carried out in a PON system, especially when two or more branches with thesame length exist is solved.

Description

【Technical field】 [0001] The invention relates to the technical field of optical fiber communication, in particular to a method and system for locating faulty branches in a passive optical network. 【Background technique】 [0002] Optical time domain reflector (OTDR for short) has great practical value in many fields such as identification and location of fiber link faults, fiber length measurement and construction and maintenance of fiber optic cables. Today, passive optical devices based on OTDR A network (passive optical network, PON for short) monitoring solution has become the most widely used solution. However, although the corresponding research has been going on, the OTDR-based PON monitoring network also encounters many challenges. For the PON system, especially for the point-to-multipoint access mode of TDM-PON, the detection optical pulse sent by the OTDR enters each branch through the optical splitter, and the Fresnel reflection signal of each branch and the back...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/071H04B10/079H04Q11/00
Inventor 李海涛辛鹏黄丽艳李垠韬安慧蓉喻杰奎袁卫国雷学义杨纯宋伟李明玉王进张成星
Owner CHINA ELECTRIC POWER RES INST
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