LI Yongqian,LIU Zijuan,ZHANG Lixin,TIAN Min,FAN Haijun.Research and analysis of Brillouin distributed sensing system based on quasi-single-mode few-mode fiber[J].Optoelectronics Letters,2024,(1):7-11 Research and analysis of Brillouin distributed sensing system based on quasi-single-mode few-mode fiber Author Name Affiliation LI Yongqian  Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China Hebei Key Laboratory of Power Internet of Things Technology, North China Electric Power University, Baoding 071003, China Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology, North China Electric Power University, Baoding 071003, China  LIU Zijuan  Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China Hebei Key Laboratory of Power Internet of Things Technology, North China Electric Power University, Baoding 071003, China Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology, North China Electric Power University, Baoding 071003, China  ZHANG Lixin  Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China Hebei Key Laboratory of Power Internet of Things Technology, North China Electric Power University, Baoding 071003, China Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology, North China Electric Power University, Baoding 071003, China  TIAN Min  Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China Hebei Key Laboratory of Power Internet of Things Technology, North China Electric Power University, Baoding 071003, China Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology, North China Electric Power University, Baoding 071003, China  FAN Haijun  Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China Hebei Key Laboratory of Power Internet of Things Technology, North China Electric Power University, Baoding 071003, China Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology, North China Electric Power University, Baoding 071003, China  Abstract:       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/°C and 1.12 MHz/°C, 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. Hits: 50 Download times: 0 View Full Text    Download reader