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Sensors 2018, 18(4), 1239;

Ultrasensitive Mach-Zehnder Interferometric Temperature Sensor Based on Liquid-Filled D-Shaped Fiber Cavity

School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University, Guangzhou 510632, China
Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
Authors to whom correspondence should be addressed.
Received: 16 March 2018 / Revised: 8 April 2018 / Accepted: 13 April 2018 / Published: 17 April 2018
(This article belongs to the Section Physical Sensors)
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A liquid-filled D-shaped fiber (DF) cavity serving as an in-fiber Mach–Zehnder interferometer (MZI) has been proposed and experimentally demonstrated for temperature sensing with ultrahigh sensitivity. The miniature MZI is constructed by splicing a segment of DF between two single-mode fibers (SMFs) to form a microcavity (MC) for filling and replacement of various refractive index (RI) liquids. By adjusting the effective RI difference between the DF and MC (the two interference arms), experimental and calculated results indicate that the interference spectra show different degrees of temperature dependence. As the effective RI of the liquid-filled MC approaches that of the DF, temperature sensitivity up to −84.72 nm/°C with a linear correlation coefficient of 0.9953 has been experimentally achieved for a device with the MC length of 456 μm, filled with liquid RI of 1.482. Apart from ultrahigh sensitivity, the proposed MCMZI device possesses additional advantages of its miniature size and simple configuration; these features make it promising and competitive in various temperature sensing applications, such as consumer electronics, biological treatments, and medical diagnosis. View Full-Text
Keywords: micro-optical devices; fiber optics sensors; thermal effects micro-optical devices; fiber optics sensors; thermal effects

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Zhang, H.; Gao, S.; Luo, Y.; Chen, Z.; Xiong, S.; Wan, L.; Huang, X.; Huang, B.; Feng, Y.; He, M.; Liu, W.; Chen, Z.; Li, Z. Ultrasensitive Mach-Zehnder Interferometric Temperature Sensor Based on Liquid-Filled D-Shaped Fiber Cavity. Sensors 2018, 18, 1239.

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