A Time Division Wavelength Division Hybrid Multiplexing Passive Optical Network System

Abstract

The invention discloses a time division wavelength division hybrid multiplexing passive optical network system. The system mainly consists of an optical line terminal, an optical distribution network and n user units, the optical line terminal generates optical signals through a method that combines time division multiplexing and wavelength division multiplexing, and the optical signals are transmitted to the optical distribution network through a long-distance standard single mode fiber, and are transmitted to each optical network unit by the optical distribution network. The system adopts a novel method that combines time division multiplexing and wavelength division multiplexing, and utilizes an optical switch array and a high-speed double-arm Mach-Zehnder modulator to modulate the optical signals with different wavelengths in a time slice way. The method can simplify the complexity of a system protocol, and extremely improve the utilization rate of system bandwidth, thereby reducing system costs, increasing relay-free transmission distance of a communication system, and enhancing an upgrading capability of the system in later periods.

Description

technical field [0001] The invention relates to the communication field, in particular to a time-division wavelength-division hybrid multiplexing passive optical network system. Background technique [0002] From the perspective of the entire network structure, with the rapid development of communication technology, the backbone network has undergone breakthrough development; at the same time, due to the progress of Ethernet technology, the bandwidth of LAN has also developed to more than 1Gbps. A section of wired electric domain access network connecting the backbone network with the local area network and home users has become the bottleneck of the entire network system. Therefore, the optical passive access network has become the optimal solution for the access network because of its advantages such as high bandwidth and low loss. [0003] At present, the development trend of passive optical access network is from APON (ATM-PON) to EPON and GPON (APON, EPON, GPON are all...

AI Technical Summary

Problems solved by technology

However, the current TDM / WDM-PON uses an optical splitter at the ODN end as the ONU connection end to divide the power of the optical signal into N equal parts (N is the number of users), which not only shortens the transmission distance, but also requires Strict time synchronization is required to complete multi-user uplink data transmission

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