引入衔套调制结构形成相移长周期光纤光栅的特性研究  

Study on characteristics of phase-shifted long period grating with an embedded-modulation structure

作　　者：李晓兰[1] 张伟刚[1] 尚佳彬[1] 张珊珊[1] 

机构地区：[1]南开大学现代光学研究所,光学信息技术科学教育部重点实验室,天津300O71,天津300071

出　　处：《光电子．激光》2012年第3期413-417,共5页Journal of Optoelectronics·Laser

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项目

摘　　要：通过在长周期光纤光栅(LPG)上某个位置引入一段衔套调制结构,设计并研制出了一种新型相移长周期光纤光栅(PSLPG),并采用传输矩阵法模拟了其光谱特性。模拟结果表明:在LPG某点引入衔套调制结构,当衔套调制结构都为均匀短光栅,且与被调制光栅的折射率调制深度相同但周期不同时,所形成的光栅仍旧可等效为一个单PSLPG,而引入相移量的大小相当于两个调制结构的分别引入相移量之和。最后采用CO2激光单侧曝光法写制技术对引入衔套调制结构形成的PSLPG进行了写制,实验结果与理论分析相符。We propose a new method to design a phase-shifted long period grating （PSLPG） by adding an embedded-modulation structure in a long period grating at some position. The spectral characteristics are obtained by the transfer matrix simulated approach. The studies show that when a uniform short grating embedded-modulation structure, which has the same modulated depth but different period with the origi- nal one,is added in a long period grating;the grating also could be seen as a single phase-shifted long period gating,and the magnitude of phase-shifting is the sum of the two modulation structures in the em bedded-modulation structure. Furthermore, we fabricated the embedded-modulation PSLPG by CO2 laser exposure, and the experiment agrees well with the theory.

关 键 词：相移长周期光纤光栅(PSLPG) 调制结构 嵌套调制 光栅设计 

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]