Chinese Optics Letters, 2017, 15 (2): 020603, Published Online: Jul. 26, 2018  

Temperature-insensitive refractive index sensor based on Mach–Zehnder interferometer with two microcavities Download: 1109次

Author Affiliations
1 Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
2 Vibration and Noise Control Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
3 School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
Abstract
We propose a temperature-insensitive refractive index (RI) fiber sensor based on a Mach–Zehnder interferometer. The sensor with high sensitivity and a robust structure is fabricated by splicing a short photonic crystal fiber (PCF) between two single-mode fibers, where two microcavities are formed at both junctions because of the collapse of the PCF air holes. The microcavity with a larger equatorial dimension can excite higher-order cladding modes, so the sensor presents a high RI sensitivity, which can reach 244.16 nm/RIU in the RI range of 1.333–1.3778. Meanwhile it has a low temperature sensitivity of 0.005 nm/°C in the range of 33°C–360°C.

Yinfeng Wang, Sumei Wang, Lan Jiang, Hua Huang, Liuchao Zhang, Peng Wang, Lingya Lv, Zhitao Cao. Temperature-insensitive refractive index sensor based on Mach–Zehnder interferometer with two microcavities[J]. Chinese Optics Letters, 2017, 15(2): 020603.

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