Ultrasensitive Mach-Zehnder Interferometric Temperature Sensor Based on Liquid-Filled D-Shaped Fiber Cavity
Hui Zhang,
Shecheng Gao,
Yunhan Luo,
Zhenshi Chen,
Songsong Xiong,
Lei Wan,
Xincheng Huang,
Bingsen Huang,
Yuanhua Feng,
Miao He,
Weiping Liu,
Zhe Chen,
Zhaohui Li
Affiliations
Hui Zhang
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
Shecheng Gao
Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
Yunhan Luo
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University, Guangzhou 510632, China
Zhenshi Chen
Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
Songsong Xiong
State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
Lei Wan
Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
Xincheng Huang
Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
Bingsen Huang
Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
Yuanhua Feng
Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
Miao He
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
Weiping Liu
Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
Zhe Chen
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University, Guangzhou 510632, China
Zhaohui Li
State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
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.
