Multi-Wavelength Ultra-Weak Fiber Bragg Grating Arrays for Long-Distance Quasi-Distributed Sensing

作     者：Wenjing GAO Jianxia LIU Huiyong GUO Xin JIANG Shaofa SUN Haihu YU Wenjing GAO;Jianxia LIU;Huiyong GUO;Xin JIANG;Shaofa SUN;Haihu YU

作者机构：Hubei Key Laboratory of Radiation Chemistry and Functional MaterialsHubei University of Science and TechnologyXianning437100China National Engineering Laboratory for Fiber Optic Sensing TechnologyWuhan University of TechnologyWuhan 430070China 

出 版 物：《Photonic Sensors》 (光子传感器（英文版）)

年 卷 期：2022年第12卷第2期

页      面：185-195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：All authors thank the National Engineering Laboratory for Fiber Optic Sensing Technology for offering the experimental equipment.This work was supported by the National Natural Science Foundation of China(Grant No.61290311) Hubei Key Laboratory of Radiation Chemistry and Functional Materials(Grant No.2019-20KZ08) State Key Laboratory of Advanced Technology for Materials Synthesis and Processing(Grant No.2019-KF-ll) 

主　　题：Multi-wavelength gratings array large scale sensing network crosstalk ultra-weak grating 

摘      要：Fiber Bragg grating(FBG)array,consisting of a number of sensing units in a single optical fiber,can be practically applied in quasi-distributed sensing *** signal crosstalk occurring between large-serial of identical FBGs,however,has limited the further increase in the number of sensing units,thus restricting applications only for short-distance sensing *** reduce the signal crosstalk,we design two novel types of 10-kilometer-long FBG arrays with 10000 equally spaced gratings,written on-line using a customized grating inscription system,which is affiliated to a drawing *** factors causing signal crosstalk,such as spectral shadowing and multiple reflections,are firstly investigated in *** with the theoretical findings,experimental results are proving that ultra-weak(the reflectivity of—40 dB)and multi-wavelength gratings of a number more than 10000 can be readily identified,with satisfied low *** maximum attenuation of grating signal and minimum signal-to-noise ratio(SNR)in a single-wavelength array are 10.69 dB and 5.62 dB,*** a comparison,by increasing the number of central wavelengths to three,the attenuation can be effectively reduced to 5.54dB and the minimum SNR has been improved to 8.14 *** current study significantly enhances the multiplexing capacity of FBG arrays and demonstrates promising potentials for establishing large-capacity quasi-distributed sensing networks.