具有随机变化参数的暗孤子传输系统的稳定性分析

STABILITY ANALYSIS FOR DARK SOLITON TRANSMISSION WITH RANDOMLY VARYING PARAMETER

利用动量守恒扰动方法，分析了分布放大传输系统中具有随机变化参数的暗孤子传输的稳定性。研究结果表明：在具有随机变化参数的暗孤子传输系统中，随机变化参数对孤子的速度产生影响，与放大器自发辐射噪声的联合作用增大了暗孤子到达检测窗口的时间科动，影响了暗孤子传输系统的稳定性和增大了系统的误码率。为了削弱随机变化参数对暗光孤子脉冲速度影响，可在传输线上通过引入非线性增益来有效地抑制暗孤子的时间抖动，进行有效地传输控制，既可以稳定孤子传输，又可以有效地抑制孤子的时间科动而产生的误码率。

Stability of distributed amphification dark soliton transmission system with randomly varying parameter is analyzed by pertarbation method of momentum conservation. The results show,randomly varying parameter influences the velocity of dark soliton in the system,the combined role with amplified spontaneous emission noise in creases the time jiffers in arrival,affect the stability and in crease the bit-error rate of system. In order to suppress the influence,the nonlinear gain is introduced to control the transmission and to suppress the bit-error rate caused by time jiffers.