高速光通信系统光纤光栅色散补偿的偏振模色散研究

Research on PMD Compensation of CFBG in High Speed Optical Communication System

计算了不同传输速率的高速光通信系统偏振模色散(PMD)的允许容差。介绍了光纤光栅PMD的测量方法,并分别测量了B/Ge和氢载两种光敏光纤上写入啁啾光纤光栅(CFBG)的PMD值。测量结果表明,相同参数情况下,两种光敏光纤上写入CFBG的PMD值分别为10 ps左右以及1 ps以下。在10 Gb/s,1500 km光纤光栅色散补偿系统中,分别采用以上两种光敏光纤写入光栅制作色散补偿器,结果表明,当误码率为10-12时,未对光栅进行PMD补偿前,信道无误码功率代价分别为6.36 dB和1.42 dB。利用保偏光纤对CFBG的PMD进行补偿后,信道无误码功率代价改善为1.32 dB和1.36 dB。

The tolerance of polarization mode dispersion（PMD） of high speed communication system under different bit rates is calculated.Theoretic analysis and experimental measurement are carried out on PMD of chirped fiber Bragg grating（CFBG） fabricated in B/Ge and hydrogen-loaded photo-sensitive fibers respectively.The results show that under the same conditions,the PMD of these two kinds of CFBGs are nearly 10 ps and less than 1 ps,respectively.In a 10 Gb/s 1500 km transmission system with 10-12 bit error ratio（BER）,these two kinds of CFBGs are used for dispersion compensation,without PMD compensation,the power penalty of the system are 6.36 dB and 1.42 dB.After the PMD are compensated by using polarization maintaining fiber,the power penalty of the system are improved to be 1.32 dB and 1.36 dB.