副载波复用系统中偏振模色散对监测信号偏振度灵敏度的影响

Effect of PMD on Sensitivity of Degree of Polarization in SCM System

在光副载波复用(SCM)系统中若使用DOP作为DGD的监测信号将会遇到灵敏度低的问题.讨论了色度色散(CD)和初始啁啾对监测信号DOP的影响,找出了影响监测信号灵敏度的因素,提出了相应的解决方法.使用一个窄带滤波器用来平衡光载波和边带的功率,DOP对DGD的灵敏度将会明显的增长.

The problem of low sensitivity will become seriously if DOP is used as the monitor signal of DGD in SCM system. At first, the influence of chromatic dispersion （CD） and initial chirp on DOP are analyzed. Then, the factors working on the low sensitivity of DOP is found out and an approach solving the problem is suggested. Finally, a narrow-band optical filter is used to equalize the power of the carrier and one of the sidebands by offsetting the filter from the carrier is presented to make the DOP sensitivity to DGD increase.