波分复用系统中的四波混频估算和非线性仿真

在叔分复用（ＷＤＭ）光纤通信系统中，群速度色散（ＧＶＤ）、自相位调制（ＳＰＭ）、互相位调制（ＸＰＭ）以及四波混频（ＦＷＭ）等非线性效应能明显降低系统性能，给出了在系统中四波混频效应的简单估算公式，以及在采用单信道方法仿真波分复用系统的非线性效应时，为保证计算精度所需的步长的选取公式，提出了一种基于求解多信道耦合波方程组的群速度色散／自位位调制／互相位调制／四波混频仿真算法，可大大减少计算工作量，这

Simple FWM Evaluation and Novel Nonlinear Effect Simulation Method for WDM Optical Fiber Transmission Systems

In w avelength division m ultiplexing ( W D M ) optical fiber com m unication sys tem s, the signal quality after transm ission can be severely im paired by self phase m odulation( S P M ), cross phase m odulation ( X P M ) and four w ave m ixing ( F W M ) effects. A sim pleform ula to estim ate F W M effect is derived. Furtherm ore, during the nonlinearity sim ulationin W D M system s by single channel m ethod, a step size form ula is proposed to optim ize be tw een com puting accuracy and speed. An alternative sim ulation m ethod for G V D, S P M , X P M and F W M based on m ultiple channel coupled w ave equations is also developed, result ing in significant decrease in com putation w orkload.