Single fiber passive optical network system bifurcated using optical circulator

Abstract

The invention discloses a single-fiber passive optical network system forked by using an optical circulator, and belongs to the technical field of optical fiber networks. A single optical fiber of a passive optical network for simultaneously transmitting optical signals in opposite directions is branched at any position, and all branches are connected with branches of the branched passive opticalnetwork by using a three-port optical circulator, so that the optical signals from all branches at a branching point can be output to the respective next branch around the branching point along the same direction. Any branch of the passive optical network is ended in the form of a connection node, an additional three-port optical circulator is used for an idle single branch, one port is connectedwith the idle branch, and the remaining two ports are in butt joint according to the light advancing direction. Therefore, the passive optical network enters the passive optical network again for continuous transmission after entering the optical signal loopback of the idle branch. Therefore, the coverage area of the network is expanded, more nodes are accessed, and dynamic adjustment and flexibleexpansion of the network are supported.

Description

technical field [0001] The invention belongs to the technical field of optical fiber network, in particular to a single-fiber passive optical network system using an optical circulator fork. Background technique [0002] At present, the known passive optical network often adopts a tree topology, which is composed of an optical line terminal (optical line terminal, OLT), multiple optical network units (Optical Network Unit, ONU) and a passive optical distribution network. The optical distribution network usually consists of multi-stage passive optical splitters connecting multiple single optical fiber lines. Physically, the passive optical network system is a tree structure, and the OLT is located at the root of the tree. Logically, the passive optical network system is a star structure, and the OLT is located in the center of the network. Therefore, although the passive optical network system has the advantages of simple network structure and strong scalability, it also ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the existing passive optical network system and provide a centerless single-fiber passive optical network system using an optical circulator fork so as to expand the coverage of the network and access more nodes , and supports dynamic network adjustment and flexible expansion

Images