非线性补偿相干光纤传输系统的通信性能预测

Communication performance prediction of nonlinear compensation coherent optical fiber transmission system

对于完全补偿了信号-信号间非线性相互作用的相干光纤传输系统,系统的通信性能主要受到非线性信号-噪声间相互作用(NSNI)的限制。提出了全阶NSNI的理论模型,以速率为256 Gb/s、调制格式为基于偏振复用的16阶正交振幅调制(16QAM)信号的奈奎斯特光传输系统为例,对全阶NSNI模型进行了验证。实验结果表明:仅考虑一阶和二阶NSNI效应会高估系统的通信性能,全阶NSNI模型则能较准确地反映NSNI效应对系统的影响。

For a coherent optical fiber transmission system that fully compensates for the signal-signal nonlinear interaction,the communication performance of the system is mainly limited by the nonlinear signal-noise interaction(NSNI).The theoretical mod-el of the full-order NSNI is proposed,and the full-order NSNI model is verified by taking a Nyquist optical transmission system with a rate of 256 Gb/s and a 16-order quadrature amplitude modulation(16QAM)signal based on polarization multiplexing as an example.The experimental results show that only considering the first-order and second-order NSNI effects will overestimate the communication performance of the system,while the full-order NSNI model can more accurately reflect the influence of the NSNI effect on the system.