A Sliding Window Based Co-ofdm Optical Phase Noise Estimation and Compensation Method

Abstract

The present invention discloses a method for estimating and compensating CO-OFDM optical phase noise based on a sliding window. After IFFT transformation of the signal, the hypothetical "transmitter" time-domain signal is obtained; each CO-OFDM symbol is estimated by using the hypothetical "transmitter" time-domain signal and the "receiver" time-domain signal polluted only by optical phase noise The time-domain value of the optical phase noise in the time domain, and then use the time-domain sliding window to perform sliding average processing on the optical phase noise of each time-domain sample, and finally perform optical phase noise compensation processing on each CO-OFDM symbol in the time domain. This method can track the change of optical phase noise, improve the accuracy of optical phase noise estimation and the performance of the entire optical communication system. The application of the system in the next generation high-speed optical communication network has great significance.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a method for estimating and compensating CO-OFDM optical phase noise based on a sliding window. Background technique [0002] Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM), as a multi-carrier coherent optical communication technology, has attracted extensive attention of scholars in recent years. Compared with single-carrier coherent optical communication technology, CO-OFDM can achieve higher spectral efficiency, more flexible spectrum usage, more efficient channel equalization and higher spectrum scalability. Although the CO-OFDM technology has many advantages mentioned above, there are still some technical challenges in its application in the optical fiber communication system. Among them, a major defect of the CO-OFDM system is that it is extremely sensitive to optical phase noise. [0003] In order to suppress the influence of optical ...

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Problems solved by technology

In order to achieve the set performance index, this method needs to increase the number of pilots, thereby reducing the effective rate and spectrum utilization of the system;

[0006] (2) In the case of large optical phase noise, the estimation error of the phase noise estimation scheme of a single CO-OFDM symbol is large, which seriously limits the overall performance of the CO-OFDM system

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