The polarization mode dispersion (PMD) of fiber Bragg gratings (FBG) is detailedly studied.Theoretic analysis and experimental measurement are carried out on FBG.

• 分析了光纤光栅(FBG)偏振模色散(PMD)产生的原因:写入光栅用的光敏光纤对紫外光吸收是不均匀的，呈指数型吸收。