激光星间通信系统中光纤光栅滤波器

Fiber grating filter in laser inter-satellites communications system

针对激光星间通信系统,提出了采用光纤光栅作为光滤波器以滤除背景光噪声。为了设计出高性能的光滤波器以满足激光星间通信系统的要求,研究了光滤波器的带宽对通信系统性能的影响。考虑多普勒频移,分析了通信系统的归一化信噪比与滤波器带宽的关系,用匹配滤波器的方法设计出光滤波器的最佳带宽。根据得到的最佳带宽,设计了符合要求的光纤光栅滤波器。最后,实验室制作出了基本满足通信系统要求的光纤光栅滤波器。

Fiber grating was proposed to reduce background optical noise as optical filter in laser inter-satellites communications system.To satisfy the requirements of laser inter-satellites communications system,the effects of optical filter bandwidth on communication performance were researched in the design of high performance optical filter.Considering Doppler shift,the relation between the normalized SNR（Signal to Noise Ratio） and the filter bandwidth was analyzed,and the optimum bandwidth derived using the matched filter method.Based on the optimum bandwidth,the fiber grating filter was designed.The fiber grating made in lab can satisfy the requirements of the laser inter-satellites communications system.