DWDM光传输系统中非线性效应的研究与仿真  

Research and simulation on nonlinear effects in DWDM optical transmission system

作　　者：冷俊敏[1] 刘刚[1] 马牧燕[1] 

机构地区：[1]北京信息科技大学信息与通信工程学院,北京100192

出　　处：《北京信息科技大学学报（自然科学版）》2012年第3期78-83,共6页Journal of Beijing Information Science and Technology University

摘　　要：密集波分复用传输系统中,在自相位调制、交叉相位调制、色散等非线性效应的作用下,系统的传输性能受到严重影响。利用分步傅里叶法求解非线性薛定谔方程,使用MATLAB进行2路、4路和8路等光脉冲信号在单模光纤信道中的传输时域与频域进行仿真。仿真结果表明,自相位调制、尤其是交叉相位调制等非线性效应不仅使信号幅值衰减,而且频谱展宽,造成信道间串扰;并且随着复用信号数的增加,频域间这种现象更显著,影响了系统的传输性能。The transmission performance is badly affected in the Dense Wavelength Division Multiplexing （DWDM） system because of nonlinear effects such as self-phase modulation, cross-phase modulation, dispersion and so on. The nonlinear Schrodinger equation is solved by using split-step Fourier method. The transmissions of two, four and eight optical pulse signals in the single-mode fiber channel are simulated by MATLAB in the time domain and in the frequent domain. The simulated results show that self-phase modulation, cross-phase modulation especially and the like make the signals＇ amplitude attenuation and the frequency spectrum broadening so to cause the crosstalk in the channel. The phenomenon is more obvious in the frequent domain as the number of multiplexed signals is increased, which has a serious influence on the transmission performance.

关 键 词：波分复用 非线性效应 自相位调制 交叉相位调制 分步傅里叶法 

分 类 号：TN929.11[电子电信—通信与信息系统]