Spectra Power and Bandwidth of Fiber Bragg Grating Under Influence of Gradient Strain  

作　　者：Qinpeng LIU Xueguang QIAO Zhen'an JIA Haiwei FU 

机构地区：[1]Key Laboratory on Photoelectric Oil-Gas Logging and Detecting (Ministry of Education), Xi'an Shiyou University, Xi'an, 710065, China

出　　处：《Photonic Sensors》2016年第4期333-338,共6页光子传感器（英文版）

基　　金：This work was supported in part by the National Natural Science Foundation of China （No. 61077006,60727004, and 61077060）, in part by the Ministry of Education Project of Science and Technology Innovation （No. Z08119）, and in part by the Shannxi Province National Science Foundation under Grant 2016JM6055.

摘　　要：The reflective spectrum power and the bandwidth of the fiber Bragg grating （FBG） under gradient strain are researched and experimentally demonstrated. The gradient strain is applied on the FBG, which can induce FBG bandwidth broadening, resulting in the variation of reflective power. Based on the coupled-mode theory and transfer matrix method, the segmental linear relationship between the gradient strain, the reflective power, and the bandwidth is simulated and analyzed, and the influence of the FBG length on the reflective spectrum is analyzed. In the experiment, the strict gradient stain device is designed; the experimental results indicate that the reflective optic power and the bandwidth of the FBG under gradient stain are concerned with the length of the FBG. Experimental results are well consistent with the theoretical analysis, which have important guiding significance in the FBG dynamic sensing.The reflective spectrum power and the bandwidth of the fiber Bragg grating （FBG） under gradient strain are researched and experimentally demonstrated. The gradient strain is applied on the FBG, which can induce FBG bandwidth broadening, resulting in the variation of reflective power. Based on the coupled-mode theory and transfer matrix method, the segmental linear relationship between the gradient strain, the reflective power, and the bandwidth is simulated and analyzed, and the influence of the FBG length on the reflective spectrum is analyzed. In the experiment, the strict gradient stain device is designed; the experimental results indicate that the reflective optic power and the bandwidth of the FBG under gradient stain are concerned with the length of the FBG. Experimental results are well consistent with the theoretical analysis, which have important guiding significance in the FBG dynamic sensing.

关 键 词：Fiber Bragg grating gradient strain reflective spectrum power reflective spectrum bandwidth 

分 类 号：TN253[电子电信—物理电子学] TU113.666[建筑科学—建筑理论]