Chinese Optics Letters, 2016, 14 (5): 050601, Published Online: Aug. 6, 2018  

Fiber in-line Fabry–Pérot interferometer for simultaneous measurement of reflective index and temperature

Author Affiliations
Jiangsu Key Laboratory on Opto-Electronic Technology, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China
Abstract
A fiber in-line Fabry–Pérot interferometer is presented. The sensing head consists of a micro ellipsoidal air cavity and a small section of solid-core photonic crystal fiber. The reflective index (RI) and temperature can be interrogated simultaneously through a fast Fourier transform and by tracing the dip wavelength shift of the reflective spectrum. Experimental results show that the RI amplitude and wavelength sensitivities are 5.30/RIU and 8.46×10 1 nm/RIU in the range from 1.34 to 1.43, and the temperature amplitude and wavelength sensitivities are 6.8×10 4/°C and 2.48×10 3 nm/°C in the range from 15°C to 75°C, respectively. Easy fabrication, a simple system, and simultaneous measurement make it appropriate for dual-parameter sensing application.

Xiaoqi Ni, Ming Wang, Dongmei Guo. Fiber in-line Fabry–Pérot interferometer for simultaneous measurement of reflective index and temperature[J]. Chinese Optics Letters, 2016, 14(5): 050601.

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