高频CO_2激光脉冲写入的超长周期光纤光栅  

Ultra-Long Period Fiber Gratings Written by High-Frequency CO_2 Laser Pulses

作　　者：朱涛[1] 饶云江[2] 莫秋菊[1] 

机构地区：[1]重庆大学光电工程学院,重庆400030 [2]电子科技大学通信与信息工程学院,成都610015

出　　处：《光子学报》2005年第11期1697-1700,共4页Acta Photonica 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)资助

摘　　要：研究了周期为3mm的超长周期光纤光栅(ULPFG)各谐振峰的温度和应变特性,报道了用高频CO2激光脉冲写入的周期可达数毫米的包层折变非对称分布的ULPFG.该光栅各谐振峰由不同阶次闪耀模与纤芯基模同向耦合而成,理论和实验表明不同阶次谐振峰对外界参数如温度、应变等变化具有不同的灵敏度,因此这种ULPFG可望用于多参数同时测量中.Novel ultra-long period fiber gratings （ULPFGs） with periods of up to several millimeters, which were written by the high-frequency CO2 laser pulses, were reported. The refractive index change occured mainly within the cladding area of the fiber and had an unsymmetrical distribution on the cross-section of the ULPFG. The resonant loss peaks of the ULPFG were generated from the coupling of the forward propagating core mode to the cladding modes of fundamental and harmonic orders. Such a ULPFG can be used to measure multi-parameters simultaneously as these resonant loss peaks have different sensitivities to temperature, strain, bending and torsion, et al. The temperature and strain characteristics of the ULPFGs with 3 mm period were investigated by experiment. Meanwhile,several new approaches of the potential applications of the ULPFG were proposed.

关 键 词：导波光学 光纤传感器 CO2激光脉冲 ULPFG 多参数 

分 类 号：TN253[电子电信—物理电子学]