高频CO_2激光脉冲写入光子晶体光纤长周期光栅的高温退火特性研究  

Study on High-Temperature Annealing Behavior of CO_2 Laser Pulse-Induced Long-Period Fiber Grating in a Photonic Crystal Fiber

作　　者：段德稳[1] 饶云江[1,2] 柯涛[1] 徐敏[1] 

机构地区：[1]重庆大学光电工程学院光电技术及系统教育部重点实验室,重庆400044 [2]电子科技大学通信与信息工程学院宽带光纤传输及通信网络技术教育部重点实验室,四川成都610054

出　　处：《光学学报》2010年第8期2214-2218,共5页Acta Optica Sinica

基　　金：国家自然科学基金(60537040);重庆市自然科学基金(CSTC2008BB2165);"211工程"三期建设项目(S-09112)资助课题

摘　　要：报道了高频CO2激光脉冲在无限截止单模光子晶体光纤上写入的长周期光纤光栅的高温快速退火特性。实验发现以大约600℃为转折点,在退火温度低于600℃时,退火后的光栅谐振峰在低于退火温度的高温环境中的温度响应和应变响应都不稳定,线性度和重复性都较差;而在退火温度高于600℃而低于700℃时,退火后的光栅谐振峰在低于退火温度的高温环境中的温度响应和应变响应都很稳定,线性度和重复性也很好。如果将光栅加热到更高温度时,光栅会被慢慢部分擦除掉。通过对CO2激光脉冲在光纤上写入光栅过程引入光纤轴向不均匀的应力在不同高温下释放效率和程度的分析,对该现象进行了解释。High temperature fast annealing behavior of CO2 laser pulse induced long-period fiber grating（LPFG）in an endless single-mode photonic crystal fiber（ESM-PCF）was studied.The experiment shows that the turning temperature is about 600 ℃.When the annealing temperature is lower than 600 ℃,the annealed ESM-PCF LPFG＇s temperature resporse and tensile strain response are both unstable when the ambient temperature is lower than the anneaing temperature.And both the linearity and the repeatability of the responses are poor.When the annealing temperature is between 600 ℃ and 700 ℃,the annealed ESM-PCF LPFG＇s temperaure response and tensile strain response are both stable with good linearity and repeatability when the ambient temperature is lower then the annealing temperature.When the temperature goes higher,the grating will be gradually and partly erased.This can be explained by the releasing stress induced in the grating writing process and fused silica structure change when heated.

关 键 词：光子晶体光纤 长周期光纤光栅 CO2激光 

分 类 号：TN253[电子电信—物理电子学]