在波分复用(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。给出了此类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/自相位调制/互相位调制/四波混频仿真算法,可大大减少计算工作量。这些都有助于光纤通信系统的设计。

In wavelength-division multiplexing (WDM) optical fiber communication systems, the signal quality after transmission can be severely impaired by self-phase modulation (SPM), cross-phase modulation (XPM) and four wave mixing (FWM) effects. A simple formula to estimate FWM effect is derived. Furthermore, during the nonlinearity simulation in WDM systems by single-channel method, a step-size formula is proposed to optimize between computing accuracy and speed. An alternative simulation method for GVD, SPM, XPM and FWM based on multiple-channel coupled-wave equations is also developed, resulting in significant decrease in computation workload.