三包层长周期光纤光栅谐振波长与薄膜光学参数的关系  

The relation between resonant wavelengths and film optical parameters of triple-clad long-period fiber grating

作　　者：徐艳平[1] 顾铮■ 陈家璧[1] 

机构地区：[1]上海理工大学光电功能薄膜实验室,上海200093

出　　处：《光学技术》2006年第2期177-179,182,共4页Optical Technique

基　　金：上海市教育委员会曙光计划资助项目(02SG32);上海市自然科学基金资助项目(03ZR14071)

摘　　要：通过求解严格的耦合模理论建立的三包层结构长周期光纤光栅特征方程,研究了三包层长周期光纤光栅谐振波长与第二包层(薄膜)的折射率和厚度之间的关系。结果发现,随着膜厚及折射率的增大,谐振波长偏移的变化分成三个区域,这与Nicholas D R的实验结果相符。利用HE/EH模的判据数,对三个区域的模特性进行了分析,给出了区域划分的衡量标准。给出了在不同薄膜参数时的长周期光纤光栅透射谱,发现一阶低次HE模式的耦合强度要远大于一阶低次EH模式。By resolving the eigenvalue equation of triple-clad long-period fiber grating based on rigorous coupled mode theory, the relationship between the resonant wavelengths of triple-clad long-period fiber grating and the thickness as well as the refractive index of the second cladding（thin film） was studied. The results show that the shift of resonant wavelengths can be divided into three regions, which agrees with the experiment result of Nicholas D R. The mode characteristic of the three regions was analyzed using the criterion coefficient of HE/EH mode, and the standard of region division was given. The transmission spectrum of triple-clad long-period fiber grating of different film parameters is given, and it is found that the coupling strength of low-order ι = 1 HE modes is stronger than that of low-order ι = 1 EH modes.

关 键 词：长周期光纤光栅 谐振波长 耦合模理论 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]