论文部分内容阅读
报道了一种用高频CO2激光脉冲在普通通信光纤包层边缘单侧写入的新型长周期光纤光栅。研究发现,这种长周期光纤光栅的折射率变化主要发生在光纤包层区域,而纤芯的折射率变化较小;同时该光栅的附加损耗低于0.5 dB。进一步折射率特性实验研究表明,由于其特殊的折变结构,这种光栅具有较高的外界环境灵敏度,当外界折射率在1.41~1.45范围内变化时,其谐振波长漂移量高达15.52 nm,比实验测得的用传统方法写入的长周期光纤光栅谐振波长漂移量高出近3倍,这种光栅结构在光纤传感中将具有重要的应用。
Reported a new type of long-period fiber grating written with high-frequency CO2 laser pulses on one side of the edge of common communications cladding. It is found that the refractive index of this long-period fiber grating changes mainly in the fiber cladding region, while the refractive index of the core changes little. Meanwhile, the additional loss of the grating is less than 0.5 dB. Experimental study on the properties of further refractive index shows that due to its special folded structure, this grating has high sensitivity to external environment. When the refractive index changes from 1.41 to 1.45, the wavelength shift of resonant wavelength is as high as 15.52 nm Experimentally measured long-period fiber grating with conventional methods to write the resonant wavelength drift nearly 3 times higher, this grating structure in optical fiber sensing will have an important application.