高速光传输系统的带内非线性作用

Intra-channel Nonlinear Effects in High Speed Optical Transmission System

分析了高速光传输系统中带内非线性作用的产生原因和影响因素,通过数值仿真和分析,得到了结论:在抑制带内非线性作用方面,相位调制优于幅度调制;色散后补偿优于色散预补偿,对于功率较大的情况尤为明显;对于一定的发射功率,脉冲占空比有一个最优值。

Intra-channel nonlinear effects impose a major limitation to system performance in high speed optical transmission. These effects, which are usually referred to intra-channel four-wave mixing (IFWM) and cross-phase modulation (IXPM), may cause amplitude and timing jitter and lead to serious transmission penalties. The paper discussed causes and several factors of intra-channel pulse interaction. Analysis and numerical simulation derive conclusions as follows: To suppress intra-channel nonlinear effects, phase modulation is superior to amplitude modulation, and post-compensation of dispersion is superior to pre-compensation, especially for large launched power. In addition, the duty cycle of pulse has an optimum value for a certain launched power.