High-power-budget OFDM passive optical network downlink transmission system

Abstract

A high-power-budget OFDM passive optical network downlink transmission system includes an optical line terminal, feeder type optical fibers and a plurality of passive optical network systems, wherein the optical line terminal, the feeder type optical fibers and the passive optical network systems are connected in sequence. Each passive optical network system includes far-end nodes, a plurality of distributed optical fibers and a plurality of optical network units. The optical line terminal is connected to the far-end nodes through the feeder type optical fiber; the far-end nodes are connected to the optical network units through the distributed optical fibers; the optical line terminal includes a first media access control module, a downlink data transmitting module, a periodic filter and an optical amplifier, wherein the first media access control module, the downlink data transmitting module, the periodic filter and the optical amplifier are connected in sequence; the first media access control module is used for controlling generating and processing of downlink original data signals; the downlink data transmitting module is used for converting the downlink original data signals into OFDM optical signals as downlink transmission signals; the periodic filter is used for chirp management of the downlink transmission signals. The high-power-budget OFDM passive optical network downlink transmission system is low in cost, easy to implement and high in power budget and can be deployed on a next generation access network system which supports long distance and high branching ratio.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a high power budget OFDM passive optical network downlink transmission system. Background technique [0002] As user bandwidth requirements continue to increase and the number of users continues to increase, access network systems are faced with requirements such as ultra-bandwidth services, big data services, high branch ratios, and long-distance access. The traditional time division multiplexing (Time Division Multiple, TDM) passive optical network has been difficult to meet the needs of future development. Orthogonal Frequency Division Multiplexing (OFDM) has the characteristics of high spectral efficiency and strong anti-dispersion ability, and is considered to be a very potential technology in the next generation optical access network. The technology utilizes multiple orthogonal sub-carriers to transmit data and supports flexible dynamic bandwidth allocation....

AI Technical Summary

Problems solved by technology

However, the algorithm must obtain a relatively accurate static channel response in advance, which is inflexible to a certain extent. If the optical link changes slightly, the channel estimation result is basically unacceptable.

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