Temperature Sensor by Using Selectively Filled Photonic Crystal Fiber Sagnac Interferometer

• Main Authors: Ying Cui, Perry Ping Shum, Dora Juan Juan Hu, Guanghui Wang, Georges Humbert, Xuan-Quyen Dinh
• Format: Article
• Language: English
• Published: IEEE 2012-01-01
• Series: IEEE Photonics Journal
• Subjects: Sagnac interferometer; temperature sensor; photonic crystal fiber; selective filling
• Online Access: https://ieeexplore.ieee.org/document/6297990/

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 <formula formulatype="inline"><tex Notation="TeX">$\hbox{nm}/^{\circ}\hbox{C}$</tex> </formula> was achieved with an 11.7-cm-long PM-PCF. The sensitivity dependence on the infiltration length ratio was also investigated.