System for protecting optical link of passive optical network, device thereof and method thereof

Abstract

The invention discloses a system for protecting an optical link of a passive optical network, a device thereof and a method thereof. The system comprises an optical line terminal, two optical splitters and a plurality of optical network units, wherein the optical line terminal is respectively connected with the two optical splitters through two lower connecting ports; the optical splitters the optical link which is from one lower connection port of the optical line terminal into a plurality of optical links; the plurality of optical network units respectively and correspondingly connect two upper connecting ports with one optical link on the two optical splitters; the mutually-protected optical links are formed between the optical line terminal and the two optical splitters; and the mutually-protected optical links are formed between each optical splitter and every two optical network units. By fast detecting the optical link, the invention effectively filters the dither of an optical signal on the optical link caused by the noise, the fault and the manual unplugging and plugging, thereby being capable of preventing from frequently switching between the two mutually-protected optical links.

Description

technical field [0001] The invention relates to optical fiber access technology, in particular to a method, system and device for protecting optical fibers of a passive optical network (PON, Passive Optical Network). Background technique [0002] Ethernet passive optical network is a new type of optical fiber access network technology, which adopts point-to-multipoint structure and passive optical fiber transmission, and provides various services on Ethernet. It adopts PON technology in the physical layer, uses Ethernet protocol in the link layer, and realizes the access of Ethernet by using the topological structure of PON. Therefore, it combines the advantages of PON technology and Ethernet technology: low cost, high bandwidth, strong scalability, flexible and fast service reorganization, compatibility with existing Ethernet, and convenient management. [0003] In recent years, the user scale of the access network has continued to expand, and the requirements for network ...

AI Technical Summary

Problems solved by technology

The protocol only briefly describes the physical model, and provides the definition of the extended Operation Administration Maintenance (OAM, Operation Administration Maintenance) frame format for simple switching, but does not give a specific implementation method, and the protocol only gives a simple Switching commands, the robustness and practicality of the entire protection system are not further discussed

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