Temperature-insensitive refractive index sensor based on Mach-Zehnder interferometer with two microcavities

Yinfeng Wang, Sumei Wang*, Lan Jiang, Hua Huang, Liuchao Zhang, Peng Wang, Lingya Lv, Zhitao Cao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

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.

Original languageEnglish
Article number020603
JournalChinese Optics Letters
Volume15
Issue number2
DOIs
Publication statusPublished - 10 Feb 2017

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