Sensing characteristics of a grating-based fabry-perot structure in a biconical tapered fiber

• Main Authors: Madan, Aayush, Paulose, Varghese, Chang, Wonkeun, Shum, Perry Ping, Hao, Jianzhong
• Other Authors: School of Electrical and Electronic Engineering
• Format: Conference or Workshop Item
• Language: English
• Published: 2022
• Subjects: Engineering::Electrical and electronic engineering; Fabry Perot; Microfiber
• Online Access: https://hdl.handle.net/10356/157733
• Institution: Nanyang Technological University

In this article, we present the sensing charac-teristics of a fiber Bragg grating (FBG) based Fabry-Perot (FP) structure in an acrylate coated biconical tapered fiber. The fiber-diameter was tapered down to 70μm using flame brushing technique followed by point-by-point writing of the FP structure within the fiber core using infrared femtosecond laser pulse irradiation. The sensing structure consists of two identical gratings separated by a small gap. The strain characteristics, ranging up to 3440μϵ, and the temperature characteristics, ranging up to 225 °C, have been investigated. The sensing sensitivities for strain and temperature were found out to be 2.32 pm/μϵ and 8.86 pm/°C, respectively.