论文部分内容阅读
基于主偏振态理论和一阶偏振模色散近似 ,推导出光信号偏振度的一个简洁解析表达式。并利用该解析表达式和快速傅里叶变换 ,对 2 0Gb/s系统的偏振模色散补偿中 ,偏振度监测法的灵敏度和跟踪范围受多种因素 (如脉冲啁啾、占空比、消光比、放大自发辐射噪声、自相位调制等 )的影响程度进行了数值模拟分析。发现利用偏振度监测法反馈控制偏振模色散补偿时 ,监测灵敏度和跟踪范围是折中的 ,较小的占空比有利于提高偏振度监测法的灵敏度 ,而且总可以对高达 1.5个位周期 (75ps)的差分群延时进行跟踪 ,但当占空比低于 0 .5时 ,跟踪范围迅速缩小 ,消光比和放大自发辐射噪声不会明显改变偏振度监测法的跟踪范围 ,自相位调制效应显著地影响偏振度监测法的性能。
Based on the theory of the main polarization state and the first-order polarization mode dispersion approximation, a simple analytic expression for the polarization degree of the optical signal is deduced. In the polarization mode dispersion compensation of 20 Gb / s system, the sensitivity and tracking range of the polarization monitoring method are affected by many factors (such as pulse chirp, duty cycle, extinction Ratio, amplification of spontaneous emission noise, self-phase modulation, etc.) of the degree of impact of numerical simulation. It is found that the monitoring sensitivity and the tracking range are compromise when feedback polarization mode dispersion compensation is controlled by the polarization monitoring method. The smaller duty ratio is beneficial to improve the sensitivity of the polarization monitoring method, and the sensitivity of the polarization monitoring method can always be up to 1.5 bit cycles 75ps). However, when the duty cycle is less than 0.5, the tracking range is rapidly reduced. The extinction ratio and the amplification of spontaneous emission noise will not significantly change the tracking range of the polarization monitoring method. The self-phase modulation effect Significantly affect the performance of the polarization monitoring method.