Research and analysis of Brillouin distributed sensing system based on quasi-single-mode few-mode fiber  

作　　者：LI Yongqian LIU Zijuan ZHANG Lixin TIAN Min FAN Haijun 

机构地区：[1]Department of Electronic and Communication Engineering,North China Electric Power University,Baoding 071003,China [2]Hebei Key Laboratory of Power Internet of Things Technology,North China Electric Power University,Baoding 071003,China [3]Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology,North China Electric Power University,Baoding 071003,China

出　　处：《Optoelectronics Letters》2024年第1期7-11,共5页光电子快报（英文版）

基　　金：supported by the National Science Foundation for Distinguished Young Scholars(No.62205105);the National Natural Science Foundation of China(Nos.61775057,52177141 and 62171185)。

摘　　要：A distributed fiber sensor was fabricated by splicing two single-mode fibers(SMFs)using the few-mode fiber(FMF)technique.A Brillouin optical time domain analysis(BOTDA)system was developed to measure the sensor’s temperature and bending performance.Two-mode and four-mode step FMFs were combined to splice the few-mode segment.The results indicate that the temperature response coefficients of the few-mode segment are only slightly higher than those of the connected single-mode segment,measuring at 1.13 MHz/℃and 1.12 MHz/℃,respectively.The minimum bending radius for the sensor is 0.9 cm,and the four-mode bending response curve is superior to that of the two-mode one,proving that 4-SI-FMF offers better bending sensitivity.

关 键 词：FIBER technique MODE 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]