啁啾长周期光纤光栅的滤波特性研究

摘要

基于光纤光栅耦合模理论,采用传输矩阵法对啁啾长周期光纤光栅的啁啾系数和光栅参量(光栅长度、光栅周期和折变量)对其滤波特性的影响进行分析.当啁啾系数处于-0.000008～-0.0004 nm/cm范围内时,可用于宽带带阻滤波器.当啁啾系数处于-0.05～-1 nm/cm范围内时,可用于多通道窄带滤波器.为啁啾光纤光栅滤波器的优化设计提供理论依据.%The spectral characteristics of chirped long-period fiber grating are analyzed with the transfer matrix method based on the coupling theory. The influences of various chirp coefficients and structural features on the filtering characteristics are studied numerically. When the chirp coefficient varies between - 0. 00008 nm/cm and 0. 004 nm/cm,it can be used for broadband rejection filters. While the chirp coefficient varies between - 0.05 nm/cm and - 1 nm/cm, it can be used for narrow-band rejection filters. The results provide theoretical basis for optimal design of Chirped fiber grating filters.