高速相干光通信中相噪来源及对数字多载波的影响

Source of phase noise and its impact on digital multicarrier in high-speed coherent optical communication

介绍了高速相干光通信系统中相位噪声来源及对光传输性能的影响,并基于400G容量仿真对比了不同的激光器线宽和色散下的性能差异。仿真结果表明,高速相干光通信中的受限因素主要是激光器相位噪声和传输链路中的色散耦合产生的均衡增强相位噪声,而基于数字多载波技术相比单载波具有更强的容忍能力,能传输更远的距离。

This paper introduces the sources of phase noise in high-speed coherent optical communication systems and its impact on optical transmission performance.Based on 400G capacity simulation,the performance differences under different laser linewidths and dispersion are compared.The results show that the limiting factors in high-speed coherent optical communication are mainly the phase noise of the laser and the equalization-enhanced phase noise generated by dispersion coupling in the transmission link.The digital multicarrier technology has stronger tolerance and can transmit longer distances than the single carrier technology.