Side-polished SMS based RI sensor employing macro-bending perfluorinated POF

• Published in: Opto-Electronic Advances Vol. 4; no. 10; p. 200041
• Main Authors: Zhang, Xuezhi, Yang, Boyue, Jiang, Junfeng, Liu, Kun, Fan, Xiaojun, Liu, Zhaozhu, Peng, Min, Chen, Guanlong, Liu, Tiegen
• Format: Journal Article
• Language: English
• Published: Key Laboratory of Opto-electronics Information Technology(Tianjin University),Ministry of Education,Tianjin 300072,China 01.01.2021; Tianjin Optical Fiber Sensing Engineering Center,Institute of Optical Fiber Sensing of Tianjin University,Tianjin 300072,China; School of Precision Instrument and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China; Institue of Optics and Electronics, Chinese Academy of Sciences
• Subjects: optical sensing; perfluoropolymer fiber; plastic optical fiber; refractive index sensor; perfluoropolymer fiber; plastic optical fiber; optical sensing; refractive index sensor
• ISSN: 2096-4579
• DOI: 10.29026/oea.2021.200041

A refractive index (RI) sensor based on perfluorinated plastic optical fiber (PF-POF) is introduced in this paper. The PF-POF as multi-mode fiber was side-polished (SP) to form a macro-bending single-mode-multimode-single-mode (SMS) structure. Both ends of the sensor were closely connected to single-mode quartz optical fiber (SMF). The spectral char-acteristics of the sensor are measured, analyzed and discussed. The results show that when the length of PF-POF is 8 cm, the macro-bending radius is 3 cm, and the SP-depth is 20 μm. The intensity sensitivity reaches ?219.504 dBm/RIU in the range of RI = 1.330 ～ 1.356. A reference is provided for the application of PF-POF in RI sensor in the future. The sensor is featured with low-cost, good flexibility and high efficiency.