Fiber laser twist sensor with hybrid few-mode tilted Bragg grating and few-mode long period grating

作     者：YANG Kang LIU Yan-ge WANG Zhi LI Guo-yu HAN Ya ZHANG Hong-wei MAO Bai-wei 杨康;刘艳格;王志;李国玉;韩雅;张红伟;毛百威

作者机构：Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network TechnologyInstitute of Modern OpticsNankai UniversityTianjin300350China Institute of Information TechnologyHandan UniversityHandan056005China 

出 版 物：《Optoelectronics Letters》 (光电子快报（英文版）)

年 卷 期：2019年第15卷第3期

页      面：161-164页

核心收录：

学科分类：080202[工学-机械电子工程] 08[工学] 0802[工学-机械工程] 

基　　金：supported by the National Natural Science Foundation of China(Nos.11674177,61775107,61835006 and 11704283) the Natural Science Foundation of Tianjin in China(No.16JCZDJC31000) the Scientific Research Planning and Development Project of Handan in China(No.1621203035) 

主　　题：LPG Fiber laser twist sensor with hybrid few-mode tilted Bragg grating and few-mode long period grating 

摘      要：A twist sensor with hybrid few-mode tilted fiber Bragg grating(FM-TFBG) and few-mode long period grating(FM-LPG) in fiber laser cavity is demonstrated. The FM-LPG is utilized to excite LP11 core mode. The FM-TFBG is used for sensing. The transverse modes at 1 553.9 nm and 1 550.5 nm are LP01 and LP21 core modes, respectively, which are coupled from forward-propagating LP11 core mode. These two excitation wavelengths have opposite variation tendencies, which participate in sensing. The twist sensitivity of 0.16 dB/° from-40° to 40° is achieved. The proposed sensor has potentially used for structure monitoring in many areas.