Distributed curvature sensing based on a bending loss-resistant ring-core fiber  

作　　者：LI SHEN HAO WU CAN ZHAO LEI SHEN RUI ZHANG WEIJUN TONG SONGNIAN FU MING TANG 

机构地区：[1]Wuhan National Laboratory for Optoelectronics(WNLO)&National Engineering Laboratory for Next Generation Internet Access System,School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China [2]State Key Laboratory of Optical Fiber and Cable Manufacture Technology,Yangtze Optical Fiber and Cable Joint Stock Limited Company(YOFC)R&D Center,Wuhan 430073,China

出　　处：《Photonics Research》2020年第2期165-174,共10页光子学研究（英文版）

基　　金：National Basic Research Program of China(973Program)(2018YFB1801002);National Natural Science Foundation of China(61722108;61931010);Innovation Fund of WNLO。

摘　　要：A theoretical and experimental study on curvature sensing using a Brillouin optical time-domain analyzer based on the ring-core fiber(RCF)is reported.The Brillouin gain spectrum of the RCF is investigated,and the Brillouin frequency shift(BFS)dependence on temperature and strain is calibrated.We theoretically analyze the fiber bending-induced BFS and peak Brillouin gain variation for the RCF through a numerical simulation method,and the RCF is revealed to have a high curvature sensitivity.Distributed curvature sensing is successfully demonstrated,with the bending radius ranging from 0.5 to 1.5 cm,corresponding to a BFS variation from 32.90 to7.81 MHz.The RCF takes advantage of great bending loss resistance,and the maximum macrobending loss at the extreme bending radius of 0.5 cm is less than 0.01 d B/turn.Besides,the peak Brillouin gain of the RCF is discovered to vary significantly in response to fiber bending,which is expected to be another parameter for distributed curvature determination.The results imply that the RCF is a promising candidate for highly sensitive distributed curvature measurement,especially in sharp bending circumstances.

关 键 词：FIBER BENDING CURVATURE 

分 类 号：TN253[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]