Mode analysis of spherical probe of fiber sensor for smart grids

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Zeng, Zhongliang^1 ; Huang, Kun^2 ; Chen, Xuyu^1 ; Zeng, Mengyu^1 ; Ma, Shijie^3 ; Shen, Changsheng^3 ; Sun, Xiaohan^3

Foshan Power Supply Bureau, Guangdong Power Grid Corp., Foshan Guangdong, China^1

NARI Technology Co. Ltd., Nanjing, China^2

National Research Center for Optical Sensing, Communications Integrated Networking, Southeast University, Nanjing, China^3

关键词: Cladding modes;    Core technology;    Fundamental modes;    High order mode;    High order mode power;    Simulation model;    Spherical probes;    Strong coupling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/7/072026/pdf
DOI  :  10.1088/1757-899X/490/7/072026

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Fiber sense technologies of vibration, ultrasonic, and partial discharge are the core technologies for building smart grids. Single-mode fiber probes are key components of the above fiber sensors. The evolution of optical wave modes in fiber probes directly affects performance of fiber sensor. A simulation model for single-mode fiber spherical probe is established, and the modes of the spherical probe are simulated and analyzed in detail, and the evolution law of the optical wave mode in spherical probe is explored. The simulation results show that the longitudinal non-uniform spherical probe structure excites high-order modes. The fundamental mode power is gradually reduced, and the high-order mode power increases continuously. The main mode coupling in a single-mode fiber spherical probe is a strong coupling between the first and second-order cladding modes. At the top of the single-mode fiber spherical probe, with the decrease of the core layer radius, the high-order guided mode gradually transforms into the radiation mode, and the number of transmitted guided modes decreases gradually.