A method and device for performing dispersion compensation

Abstract

A method and device for dispersion compensation comprising: a transmitter inserting pilot information on Npilot (Npilot > 1) orthogonal frequency division multiplexing (OFDM) symbols causing the pilot information to be carried on a sub-carrier of the same frequency; a receiver extracting the pilot information from the Npilot OFDM symbols, calculating the phase of each pilot information, then calculating the dispersion phase of the pilot information on the basis of the phase of each pilot information; on the basis of the relationship between dispersion phase frequency and sub-carrier frequency, using the dispersion phase of the pilot information to calculate the dispersion phase of each sub-carrier in the OFDM symbol, and performing compensation for the dispersion phase. The present solution enables the dispersion compensation of high-speed fiber optic communication, reducing training overhead for dispersion compensation to 1 / Nsc of the overhead of a traditional dispersion compensation processing solution, where 1 / Nsc is the number of sub-carriers carrying data within an OFDM symbol.

Description

technical field [0001] The invention relates to orthogonal frequency division multiplexing and optical communication technology, in particular to a method and device for performing dispersion compensation. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) technology is a kind of multi-carrier modulation technology, which divides high-speed information data into N low-speed data streams, and modulates them to N mutually orthogonal sub-carriers for parallel transmission. , and its spectrum utilization can be nearly doubled compared with traditional single-carrier modulation techniques. At the same time, since the data is divided into N channels, the symbol period is N times larger than that of the original high-speed signal period, so that the OFDM system can reduce the impact of delay spread. [0003] When the OFDM system is applied to the optical transmission system, due to the characteristics of the optical fiber, the signal will be affected b...

AI Technical Summary

Problems solved by technology

At the same time, in order to estimate the dispersion phase impairment more accurately under the influence of the ASE noise introduced by the amplifier, it is necessary to insert multiple OFDM training sequence symbols (usually the number of OFDM training symbols > 5) at the initial stage of the transmitter, and one OFDM training sequence symbol The length of is equal to the number of subcarriers of an OFDM symbol, which makes the training sequence occupy a large system overhead in the process of dispersion estimation and compensation

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