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对取样光栅而言 ,完整的平均折射率补偿应包括切趾补偿和取样补偿两部分。理论模拟显示 ,只作切趾补偿而不作取样补偿仍然可以收到良好效果。提出了针对氩离子倍频激光器写入取样光栅的简单的切趾补偿工艺。依据是模板存在一定的干涉区 ,当光纤退出模板的干涉区后 ,只有平均折射率提高而不写入新的光栅。因此在干涉区外进行与切趾函数互补的曝光就可以切趾补偿了。实验结果显示 ,切趾补偿有效降低了取样光栅每信道反射谱的旁瓣 ,使反射谱的形状更加理想 ,同时也有效降低了群时延曲线的波纹。
For sampling gratings, the complete average refractive index compensation should include apodization compensation and sampling compensation in two parts. Theoretical simulations show that only apodization compensation without sampling compensation can still receive good results. A simple apodization compensation technology for sampling raster of argon ion frequency doubling laser is proposed. Based on the fact that there is a certain interference region in the template, when the fiber exits the interference region of the template, only the average refractive index increases without writing a new grating. Therefore, an exposure complementary to the apodization function outside the interference zone can be compensated for apodization. The experimental results show that the apodization compensation effectively reduces the sidelobes of the reflection spectrum of the sampling raster, which makes the shape of the reflection spectrum more ideal and effectively reduces the ripple of the group delay curve.