Mode analysis of spherical probe of fiber sensor for smart grids. Issue 6 (April 2019)

• Record Type: Journal Article
• Authors: Zeng, Zhongliang; Huang, Kun; Chen, Xuyu; Zeng, Mengyu; Ma, Shijie; Shen, Changsheng; Sun, Xiaohan
• Is Part Of: IOP conference series. Volume 490:Issue 6(2019)
• Publication Date: 2019-04
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/490/7/072026
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: 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.