色散管理孤子系统定时抖动的分析计算

Calculation and Analysis of Timing-Jitter in Dispersion-Managed Soliton System

利用两种方法研究了脉冲形状为高斯型的色散管理孤子系统定时抖动。利用微扰变分方法推导出光通信系统存在滤波器和自发辐射噪声的情况下,孤子参数演化的动力学方程,得出了定时抖动的表达式,并对其进行仿真,发现定时抖动来源于放大器噪声、频率偏移等,啁啾的符号和滤波器对系统总的定时抖动也有一定影响。再利用矩方法对色散管理孤子系统定时抖动进行了分析,两种方法得到的结果一致。

The timing jitter in dispersion-managed soliton system with the Gaussian pulse was studied by two methods. The dynamic equations for the evolution of soliton parameters are deduced and timing-jitter expressions are obtained by the perturbed variational method. By analyzing and simulating these timinffjitter expressions, it is found that the timing-jitter is induced by the amplifier spontaneous emission noise and the frequency shift etc. , the sign of the chirp and filter have also effects on the total timin-jitter. Then again, the timing-jitter is also calculated and analyzed by the moment method. As a consequence, the calculated results of two methods are consistent.