相移长周期光纤光栅的透射谱特性及其切趾优化  

Transmission spectra characteristics of phase-shifted long-period fiber gratings and apodized optimization

作　　者：王德法[1] 施解龙[1] 陈圆圆[1] 陈冠群[1] 

机构地区：[1]上海大学理学院物理系,上海200444

出　　处：《量子电子学报》2006年第5期725-730,共6页Chinese Journal of Quantum Electronics

基　　金：上海市教委基础研究重大项目(04JC14036);上海市教委重点学科资助项目(T0104)

摘　　要：应用耦合模理论和传输矩阵法计算模拟了均匀长周期光纤光栅的透射谱,采用不同的切趾函数对其进行了切趾优化,通过比较得出了最佳的切趾函数。分析了引入多个π相移的相移长周期光纤光栅的透射谱结构,发现其具有一个通带、两个阻带的滤波特性。着重分析了相移个数,引入位置等参数对谱结构的影响。除运用传统的高斯函数折射率切趾方法对透射谱进行优化外,尝试了一种新型的长度切趾方法,达到了较好的优化效果。该方法的易实现性为切趾相移长周期光纤光栅的实际制作带来了方便。Based on the coupled-mode theory, the transfer-matrix method is used to calculate the transmission spectra of π phase-shifted long-period fiber gratings（LPFG）. It is found that multi-π-phase-shifted LPFG is a filter with two stopbands and one passband , and the pass band width increases with number of π phase shift. Index apodization method and a new length apodization method are used to optimize the transmission spectra of phase-shifted LPFGs. And the easily realization of the new length apodization method can facilitate the fabrication of phase-shifted LPFG.

关 键 词：纤维与波导光学 相移长周期光纤光栅 耦合模 传输矩阵 切趾 

分 类 号：TN929.11[电子电信—通信与信息系统] TN253[电子电信—信息与通信工程]