高速光通信系统中光纤光栅色散补偿研究

通过对光栅制作过程的优化设计，解决了光纤光栅温度稳定性、纹波系数、带宽、偏振模色 散补偿等关键技术，所制作光纤光栅已经达到温度系数小于00005 nm/℃，带宽大于14 nm，纹波系数小于50 ps，色散量超过 -1000 ps/nm的先进水平. 采用琼斯矩阵本征值法较 精确地测量了光栅的偏振模色散，并对其进行了补偿，光纤光栅色散补偿器的偏振模色散由 补偿前的91406 ps改善为补偿后的01521 ps. 在此基础上，成功地建立了一个稳定可靠 、速率为40 Gb/s，传输链路为122 km G 关键词： 高速光通信系统 普通单模光纤 光纤光栅 色散补偿

Studies on the dispersion compensation of fiber Bragg grating in high-speed opti cal communication system

By optimizing the fabrication process of the chirped optical fiber Bragg grating (FBG), some key problems of FBG are solved, such as the temperature stabili ty, time delay ripple coefficient, bandwidth, compensation of polarization mod e dispersion (PMD), and so on. The FBG we fabricated can attain the temperature coefficient less than 00005 nm/℃, its bandwidth is bigger than 14nm, tim e delay ripple is less than 50 ps, and the dispersion is higher than -1000ps/n m. The average PMD of the FBG dispersion compensator is measured by the Jones ma trix eigenvalue method, and is compensated. Its PMD is improved from 91406 ps to 01521 ps. With dispersion compensation by two wide_band FBGs we fabricated, we have implemented a 40 Gb/s 122 km conventional single_mode optical fiber (G6 52) systems, with a power penalty being only 14 dB.