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用精密扫描掩模法写入宽阻带啁啾光纤光栅 ,掩模板背面两端各 10 %长度处镀有按 4阶高斯函数透过率的膜 ,写入的啁啾光栅的时延纹波最大值为 2 0 ps。为减少写入光纤光栅的偏振模色散 ,研制了新的低偏振模色散光纤光栅补偿写入法。采用补偿写入法前的平均微分群时延为 9.14 0 6ps ;采用补偿写入法后的平均微分群时延为0 .15 2 1ps。并利用低偏振模色散光纤光栅对 4 0Gb/s光时分复用系统在普通G .6 5 2光纤传输 12 2km的色散进行了补偿实验 ,功率代价为 1.5dB。
Wide-stop band chirped fiber gratings were written with a precision-scan mask method. Films with a 4th order Gaussian function were printed at 10% length on both sides of the back of the reticle. The time-delay ripple of the written chirped grating The maximum value is 20 ps. In order to reduce the polarization mode dispersion of the written fiber gratings, a new low polarization mode dispersion fiber grating compensation writing method was developed. The average differential group delay before compensation writing is 9.14 0 6ps, and the average differential group delay after compensation writing is 0.1515 1 2ps. The dispersion experiment of 4 0Gb / s optical time-division multiplexed system on 122 Gbps optical fiber with common polarization grating was carried out with the low polarization mode dispersion fiber grating. The power penalty was 1.5dB.