Temperature-insensitive refractive index sensor based on Mach–Zehnder interferometer with two microcavities
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 b...
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| Published in: | Chinese optics letters Vol. 15; no. 2; pp. 25 - 29 |
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| Main Author: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
10-02-2017
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| Online Access: | Get full text |
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| Summary: | 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 of1.333–1.3778. Meanwhile it has a low temperature sensitivity of 0.005 nm/°C in the range of 33°C–360°C. |
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| Bibliography: | Yinfeng Wang 1, Sumei Wang 1, Lan Jiang 1, Hua Huang 2, Liuchao Zhang 3, Peng Wang 1, Lingya Lv 1, Zhitao Cao1（1 Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology Beijing 100081, China ; 2Vibration and Noise Control Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China ; 3School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China） 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 of1.333–1.3778. Meanwhile it has a low temperature sensitivity of 0.005 nm/°C in the range of 33°C–360°C. 31-1890/O4 |
| ISSN: | 1671-7694 |
| DOI: | 10.3788/COL201715.020603 |