System and method for detecting optical fiber faults of passive optical network

Abstract

The present invention provides a system and method for detecting fiber faults in passive optical networks. The method includes: an OTDR device sends an instruction for detecting a certain branch optical fiber, and after receiving the instruction, the branch optical fiber selector connects the specified instruction. The optical path of the branch fiber; after the OTDR device sends out the optical path detection signal, according to the received reflection signal corresponding to the optical path detection signal, analyze whether the reflection signal is abnormal to determine whether there is a fault in the trunk fiber or the corresponding branch fiber. The present invention can monitor, detect and locate the faults of the backbone of the passive optical network and all branch fibers, and select the corresponding branch fiber for detection by selecting the OTDR monitoring signal, thus avoiding signal overlap of branch fibers of equal length , can not distinguish the problem.

Description

technical field [0001] The invention relates to an optical network system in the field of communication, in particular to a system and a method for detecting a failure of an optical fiber in a passive optical network. Background technique [0002] The rapid development of network technology and the popularization of network applications, such as network communication, network shopping, and network entertainment, have become part of modern people's life, so the existing access network copper wire (wired) system is far from meeting this requirement. A high-speed and broadband demand, and the passive optical network is broadband and high-speed, environmental protection and energy-saving broadband access technology, is the best candidate to replace the existing access network, it is being accepted by most operators And be deployed to meet the growing communication users and faster and better service needs. [0003] Passive Optical Network (PON) is a point-to-multipoint optical ...

AI Technical Summary

Problems solved by technology

[0006] 1. If the distance from part of the branch fiber to the optical splitter is approximately equal, the OTDR cannot tell which branch fiber signal it is, unless a high-resolution OTDR is used

but the highest resolution available now is 2 meters

[0007] 2. If the splitting ratio of the optical splitter is very large, the Rayleigh reflection signal of the branch fiber will have a large loss when passing through the optical splitter. When it reaches the detector of the OTDR, the signal has been submerged in the noise

What's worse is that for ODN with a large splitting ratio (such as: above 1:128 splitting ratio), the gain brought by the filter may not be enough for the loss of the splitter, so the OTDR equipment at the local office may not be able to receive to any information from the branch fiber

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