引入调制结构形成的相移长周期光纤光栅研究  

Study of Phase-Shifted Long Period Grating Performed by Adding Modulated Structure

作　　者：李晓兰[1] 张伟刚[1] 张珊珊[1] 范弘建[1] 殷丽梅[1] 

机构地区：[1]南开大学现代光学研究所光电信息技术科学教育部重点实验室,天津300071

出　　处：《光学学报》2011年第6期37-41,共5页Acta Optica Sinica

基　　金：国家自然科学基金(10974100;10674075;60577018);天津市应用基础与前沿技术研究计划重点项目(10JCZDJC24300);光电信息技术科学教育部重点实验室开放课题资助课题

摘　　要：通过在长周期光纤光栅的某一位置引入一段调制结构形成积累相移,提出了一种新的相移长周期光纤光栅结构的设计方法。基于光纤光栅相位匹配原理,给出了在引入的调制结构为均匀短周期光纤光栅,其折射率调制深度与原光纤光栅一致时,调制结构的参数(光栅周期和长度)与所引起相移大小的关系式,并采用传输矩阵法和CO2激光单面曝光的方法从仿真和实验方面对所提出的结构进行了分析和验证。研究表明:在长周期光纤光栅某点引入一段均匀短周期光栅调制结构能够形成相移长周期光纤光栅,并且当其折射率调制深度与原长周期光纤光栅一致时,形成的相移长周期光纤光栅光谱只与调制结构的长度有关。We propose a new method to design novel structure of phase-shifted long period grating by adding a modulated structure in a long period grating somewhere, which performs an accumulated phase shift. Based on the phase-match theory, the relation between the phase shift and parameters of the grating is derived, while the modulated structure is a uniform short grating and its modulated depth remains the same. This new theory is simulated with the transmission matrix method and the validity is proved by experimental fabrication with C02 laser. The study shows that adding a uniform short grating in a long period grating can form a phase-shift long period grating. And the spectrum only depends on the length of modulated sturcture, in the case that its modulated depth of refractive index is the same as the original one.

关 键 词：相移长周期光纤光栅 调制结构 设计 写制 

分 类 号：TN929[电子电信—通信与信息系统] TN25[电子电信—信息与通信工程]