WDM系统中利用色散补偿降低脉冲定时抖动的研究

Research on minimization of pulse's timing jitter in a dispersion-compensated WDM system

本文对色散管理孤子系统中存在的影响脉冲传输的ASE(放大器自发辐射)致定时抖动进行了研究。利用微扰理论,通过半解析算法推导出ASE致定时抖动的算术表达式,从中得出ASE致定时抖动主要受放大器间距和色散图的影响。在此基础上对通常采用的二级色散图进行拓展,提出三级色散图方案并对色散管理系统进行计算机数值模拟,结果表明,通过选取适当的色散图参数,三级色散图方案比之二级色散图将能更好地减小因ASE噪声致定时扰动的影响。

This text analyzed the ASE-noise induced liming jitter which affected the pulse propagation in dispersion-managed WDM systems.Seml-analytical approximation by means of the perturbation theory was presented to calculate the TS （timing shift） of pulae,Results show that the ASE-noise induced liming jitter depends strongly on the amplifier positioning and dispersion map.The authors presented three-segment dispersion map plan and obtained the optimum of dispersion coefficient by means of computer simulation to the system and concluded that a more sophisticated dispersion-compensation map,with three different local of GVD, may he significantly more efficient than the one with two different local of GVD to minimize TS.