高频CO_2激光脉冲写入超长周期光纤光栅特性研究  

Sludy on characteristics of a CO_2-laser-induced ultra-long-period fiber grating

作　　者：朱涛[1,2] 饶云江[3,4] 莫秋菊[1] 王久玲[1] 

机构地区：[1]重庆大学光电工程学院 [2]成都电子科技大学通信与信息工程学院,成都610054 [3]成都电子科技大学通信与信息工程学院 [4]重庆大学光电工程学院,重庆400044

出　　处：《物理学报》2007年第9期5287-5292,共6页Acta Physica Sinica

基　　金：教育部重点基金(批准号:104210);重庆市自然科学重点基金(批准号:8415);重庆大学研究生创新基金资助的课题.~~

摘　　要：分析了高频CO2激光脉冲写入的周期达数毫米的超长周期光纤光栅(ULPFG)的模式耦合特性,并在此基础上,简单分析了这种折射率变化主要在光纤包层,且沿光纤横截面呈非对称分布的ULPFG所具有的温度、应变、扭曲及环境折射率响应特性,并在文末做了实验验证,实验结果表明该ULPFG不同谐振峰具有不同的特性响应灵敏度,这与理论分析符合得较好.这些独特的光学特性将使得这种光纤光栅在光纤通信和光纤传感中具有应用价值.A novel ultra-long-period fiber grating with periods up to several millimeters induced by using CO2 laser pulses is reported and discussed based on the mode coupling theory. The refractive index change occurs mainly within the cladding area of the fiber and has an unsymmetrical distribution on the cross-section of the ULPFG. The characteristics of temperature, strain, torsion and the effect of the refractive index of environment were investigated in theory and by experiment. The experimental results showed that different resonant peaks of the ULPFG have different sensitivities in the characteristics above mentioned, which offers possible applications in optical communications and sensing.

关 键 词：光纤传感 光纤光栅 CO2激光 超长周期光纤光栅 

分 类 号：TN253[电子电信—物理电子学]