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提出了一种基于偏振分集的相干光正交频分复用(OFDM)链路。然而相干检测对相位噪声比较敏感,偏振分集接收过程又会产生额外的乘性相位噪声,因此基于偏振分集相干光OFDM系统,提出了基于数字信号处理的相位噪声消除方案。在100km单模光纤中,以8Gbit/s的传输速率零误码传输16进制正交振幅调制OFDM信号,经相干检测之后,基于数字信号处理,对相干光OFDM信号完成了相位噪声消除,并对相位噪声消除后的信号星座图进行了实验结果分析。另外,还将经过相位噪声消除后的偏振分集相干光OFDM链路与其他相干光OFDM链路方案进行了性能对比,从而验证了此方案的优越性。
A coherent optical Orthogonal Frequency Division Multiplexing (OFDM) link based on polarization diversity is proposed. However, the coherent detection is sensitive to phase noise, and the polarization diversity reception process will generate additional multiplicative phase noise. Therefore, a phase noise cancellation scheme based on digital signal processing is proposed based on the polarization diversity coherent optical OFDM system. In 100km single-mode optical fiber, a 16-ary quadrature amplitude modulated OFDM signal is transmitted with zero bit error rate of 8Gbit / s, and phase noise elimination is performed on the coherent optical OFDM signal based on digital signal processing after coherent detection The experimental results of signal constellation after phase noise elimination are analyzed. In addition, the performances of this scheme are also verified by comparing the performance of the OFDM system with the polarization-coupled coherent optical OFDM after phase noise cancellation with other coherent optical OFDM schemes.