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改变光纤光栅紫外曝光系统 ,在相位掩模板后插入一个旋转装置 ,使得光纤在制作过程中可以进行某种旋转。通过这种方法制作的光纤光栅偏振模色散减小到平均差分群时延 (DGD)约为 0 2ps,而没加旋转制作的光纤光栅平均DGD约为 18 2 ps。采用两个这种低偏振模色散 (PMD)的光纤布拉格光栅 (FBG) ,成功地在 4 0Gb/s光时分复用 (OTDM)系统中补偿了约 2 0 4 0 ps的色散 ,该系统在经过 12 2km普通单模光纤传输后 ,未发现PMD的影响 ,传输功率代价小于 1 4dB。
Change the FBG UV exposure system by inserting a rotation device behind the phase mask to allow some rotation of the fiber during the manufacturing process. The polarization mode dispersion of the fiber gratings fabricated by this method is reduced to average differential group delay (DGD) of about 0 2ps, while the average DGD of fiber gratings without rotation is about 182 ps. Using two such fiber-optic Bragg gratings (FBGs) with low polarization mode dispersion (PMD), successfully compensating for dispersion of about 240 ps in a 40 Gb / s optical time division multiplexed (OTDM) system, After 12 2km ordinary single-mode optical fiber transmission, no impact of PMD was found, and the transmission power cost was less than 14dB.