Temperature sensor by using selectively filled photonic crystal fiber Sagnac interferometer

• Main Authors: Cui, Ying, Shum, Perry Ping, Hu, Dora Juan Juan, Wang, Guanghui, Humbert, Georges, Dinh, Xuan Quyen
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/98898; http://hdl.handle.net/10220/13490
• Institution: Nanyang Technological University

In this paper, we report an optical fiber Sagnac interferometer (OFSI)-based temperature sensor constructed by a selectively filled polarization-maintaining photonic crystal fiber (PM-PCF). The transmission spectrum of the OFSI is in sinusoidal form and is sensitive to temperature. Simulation results predicted a higher sensitivity by selective filling than nonselective filling. In experiments, we used an extremely low-cost process to realize the selective filling. A sensitivity of 2.58 $hbox{nm}/^{circ}hbox{C}$ was achieved with an 11.7-cm-long PM-PCF. The sensitivity dependence on the infiltration length ratio was also investigated.