Thin Core Fiber and Thin Fiber Based Inline Mach-Zehnder Interferometer for Temperature Measurement

In this paper, a thin core fiber (TCF) and thin fiber (TF) based inline Mach-Zehnder interferometer is proposed and demonstrated experimentally. The proposed sensor is fabricated based on SMF-TCF-TF-SMF structure and the TF is core offset spliced with the TCF. Three sensors have been designed and the transmission spectral responses versus temperatures have been investigated. The experimental results show that the temperature sensitivity can reach up to 60.71 pm$/^{\circ}\mathrm{C}$ and the temperature response linearity is as high as 99.63 %. The proposed sensor is expected to have good application prospects in biological and chemical fields due to simple fabrication, compactness and low cost.