中文摘要：

为了滤除有效光信号中的光噪声，本文提出了一种利用光栅的闪耀特性将噪声和有效信号之间的夹角角度差放大，再通过光阑得到有效光信号的方法。通过分析和仿真，使用光栅的1、2级闪耀对入射时微小角度差进行放大比较适宜。放大倍数会随着闪耀光栅的周期的减小而增大。负斜入射角度差的放大效果比正斜入射的效果更好。

英文摘要：

In order to filter out the noise contained in effective optical signal, a new memod using me blazed grating to enlarge the angle difference between noise and effective signal, and getting through the iris to get the effective signal was put forward. Through analysis and simulation, it is proven to be suitable for enlarging the small-angle-difference to use the first and the second order blaze of the grating The gain will increase with the period decreasing of the blazed grating. The enlarging effect of negative inclined incidence is better than that of positive inclined incidence.