Temperature sensing based on ethanol-filled photonic crystal fiber modal interferometer

• Main Authors: Qian, Wenwen, Zhao, Chun-Liu, Chan, Chi Chiu, Hu, Limin, Li, Tao, Wong, Wei Chang, Zu, Peng, Dong, Xinyong
• Other Authors: School of Chemical and Biomedical Engineering
• Format: Article
• Language: English
• Published: 2013
• Online Access: https://hdl.handle.net/10356/96055; http://hdl.handle.net/10220/11247
• Institution: Nanyang Technological University

A modal interferometer made of a short ethanol-filled photonic crystal fiber (PCF) combined with a fully collapsed splicing with single-mode fibers (SMFs) is proposed for temperature measurement. Two fully collapsed splicing regions between the ethanol-filled PCF and SMFs excite and recombine two interfering modes in the ethanol-filled PCF. The interference spectrum of the ethanol-filled PCF is more sensitive to temperature than that of original PCF. By monitoring one peak wavelength shift of the ethanol-filled PCF modal interference spectrum, the temperature sensitivity reaches up to -0.35 nm/°C for a 3.25-cm long ethanol-filled PCF.