Author Affiliations
Abstract
Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China
A novel high sensitivity all-fiber micro-displacement sensor is proposed and experimentally demonstrated. This sensor consists of a long period fiber gating and a fiber tip, which is achieved only by a commercial arc discharge fusion splicer, and thus possesses a lower cost. The wavelength sensitivity of the proposed sensor could be up to 934 pm/μm, which is four times higher than that of the long period fiber grating (LPFG) with an air cavity structure. The intensity change sensitivity is -1.973 dB/μm.
光电子快报（英文版）
2014, 10(3): 176
1 哈尔滨师范大学 物理与电子工程学院, 哈尔滨 150025
2 齐齐哈尔医学院 医学技术学院, 黑龙江 齐齐哈尔 161006
理论分析了切趾弱双折射光纤布喇格光栅反射偏振相关特性与温度之间的关系.数值模拟了切趾弱双折射光纤光栅的反射谱、偏振相关损耗和差分群时延随波长变化曲线.实验测出了不同温度下反射谱、偏振相关损耗和差分群时延随波长变化曲线.根据实验结果对偏振相关损耗和差分群时延的变化情况作出了分析.反射偏振相关损耗呈现两个峰值，随温度增加两峰漂移程度相同，表明偏振相关损耗无明显差异.差分群时延最大值随温度增加成线性向长波方向漂移，证明了光纤光栅正交模损耗变化的等同性.综合理论分析与实验结果表明：切趾弱双折射光纤布喇格光栅的偏振特性随温度产生明显的变化，其正交模变化呈现等比例特性.
光纤布喇格光栅 双折射 偏振相关损耗 差分群时延 Fiber Bragg grating Birefringence Polarization dependent loss Differential group delay
