【摘要】 提出了利用光带阻滤波器提高 4 0Gb/s非归零码系统中偏振度椭球对偏振模色散灵敏度的方法 ,数值研究了不同滤波器带宽对偏振度椭球三个轴长度的影响。结果表明 ,加滤波器后偏振度椭球对差分群时延和主态旋转率的敏感度明显提高 ,考虑到滤波器引入的损耗 ,提出了在最大差分群时延为 2 0ps时滤波器的带宽应限制在 10GHz以下。另外 ,数值结果还表明在滤波器带宽为 10GHz时 ,小于 4 0ps2 的偏振相关色散不会对偏振度椭球三个轴的长度产生明显的影响更多还原

【Abstract】 A novel method is proposed to improve the sensitivity of DOP (degree of polarization) ellipsoid on the polarization mode dispersion (PMD) in 40 Gb/s non-return-to-zero (NRZ) systems by using optical bandstop filters. The effects of filter′s bandwidth on the three axes of DOP ellipsoid are investigated numerically. The results show that the sensitivity of DOP ellipsoid on differential group delay (DGD) and principal state of polarization (PSP) rotation rate is greatly improved by using a filter. Considering the loss induced by the filter, the bandwidth of the filter should be limited under 10 GHz when the maximum DGD is equal to 20 ps. Additionally, the results also show that the polarization dependent chromatic dispersion (PCD) which is smaller than 40 ps 2 has less effects on the three axes of DOP ellipsoid when the bandwidth of a filter is equal to 10 GHz.更多还原