高速光传输系统的带内非线性作用

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 in High Speed Optical Transmission System

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.