多信道梳状滤波器信道间的相移补偿

Phase-shifted compensation of channel-space on fiber grating comb filter

采样大啁啾光纤光栅理论（LCSBG）是实现超高信道数梳状滤波器的理想方案,但实际制作时存在信道间隔不准确、多信道无法同时对齐的问题,文中通过对多信道梳状滤波器反射谱特性的数值模拟分析以及信道间隔误差进行了理论计算,指出问题的来源为LCSBG要求的光栅为周期倒数线性啁啾,并不是简单的线性啁啾.对此,提出了相移补偿方案,并以100信道,40GHz梳状滤波器为例进行了仿真验证,得到了理想的结果.这为实际制作高信道、高准确度的多信道梳状滤波器打下了良好的理论基础.

As the channel-space of the comb filter based on chirped sampled fiber Bragg grating and phase shift is not accurate and the multi-channel is unable to channel the standard frequency,we discussed and calculated the error between theory and practice,which has been verified by simulation.Then a compensation method by introducing phase shift between the samples was proposed,and a 100 channel comb filter with accurate 40 GHz channel-spacing was simulated,which lays a good foundation for fabricating comb filters with accurate transmission peak in the future.