A. Madan, V. Paulose, W. Chang, P. P. Shum and J. Hao, "Sensing Characteristics of a Grating-Based Fabry-Perot Structure in a Biconical Tapered Fiber," 2019 IEEE 4th Optoelectronics Global Conference (OGC), Shenzhen, China, 2019, pp. 107-111. doi: 10.1109/OGC.2019.8925018
In this article, we present the sensing characteristics 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 70 mm 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 3440 me, 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/me and 8.86 pm/ C, respectively.