Optical network system, optical line terminal, optical network unit and optical distribution network device

Abstract

The invention provides an optical network system, an optical line terminal, an optical network unit and an optical distribution network device. The optical network system comprises the optical line terminal, an optical distribution network and the optical network unit, wherein the optical line terminal is used for modulating and codling at least one path of descending signal subjected to the time-division multiple, outputting the coded signals after combining the coded signals into one path, receiving ascending signals and outputting the ascending signals after decoding the received ascending signals; the optical distribution network is used for outputting the received ascending signals after dividing the received ascending signals into multiple paths and outputting the received ascending signals to the optical line terminal after converging the received ascending signals into one path; the optical network unit is used for receiving the ascending signals output by the optical distribution network, outputting the received descending signals after decoding the received descending signals, coding a path of time-division multiplexing ascending modulation signals and outputting the coded signals to the optical distribution network; and the optical distribution network can decode the descending signals and code the ascending signals. The invention can realize a mixed passive optical network system based on time-division multiplexing technology and optical code division multiple access technology.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a hybrid passive optical network system, an optical line terminal, an optical network unit and an optical distribution network device. Background technique [0002] In current data communication, the access network becomes the infrastructure of the communication network since it is the transport entity of the Service Interface (SNI) and the associated User Network Interface (UNI). Because of this feature, the access network should adopt a fair, flexible and secure multiple address technology. Passive Optical Network (PON, Passive Optical Network) has become a popular technology in optical access network because of its wide frequency bandwidth, large capacity, convenient expansion, and suitability for high-speed data transmission. It is also the most widely used technology in optical access network technology. [0003] Typical passive optical networks, such as...

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Problems solved by technology

[0012] However, the optical code division multiple access passive optical network (OCDMA-PON) system also has its inherent disadvantages: the number of code multiplexing is limited, which limits the number of users accessing the system; as the number of multiplexing increases, the number of users The crosstalk is gradually increasing, which affects the number of access users of the system to a certain extent; OCDMA is a spread spectrum technology that requires a large bandwidth. Due to the inherent defects of BER caused by interference between users, it affects the access users of the system quantity

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