All fiber temperature sensor based on light polarization measurement utilizing graphene coated tapered fiber

Abstract

In this work, all fiber temperature measurement based on change of light polarization is demonstrated using tapered fiber coated with graphene. The large evanescent field of tapered fiber allows graphene to absorb the surrounding heat and subsequently this changes the refractive index of graphene coated tapered fiber. The change of refractive index is due to thermo‐optic effect. When there is a change in surrounding temperature, refractive index of the coated tapered fiber changes and this subsequently modifies the injected light polarization. The proposed temperature sensor can measure temperature up to 250°C and its sensitivity is ascertained at 0.48°/°C. The proposed temperature sensor is beneficial for future Internet of Things (IoT) applications.

Mode-Locked YDFL Using Topological Insulator Bismuth Selenide Nanosheets as the Saturable Absorber

“…These two-dimensional materials possess exceptional electrical and optical properties that make them suitable for use as sensors [24], modulators [25], photodiodes [26], and transistors [27]. For example, graphene is applied to a tapered fiber to enable temperature measurement [28], and MXene is used for an all-optical wavelength converter, useful for future development of the direct optical signal-processing applications [29]. The different sample thicknesses of rare earth oxide also have been investigated as a potential saturable absorber candidate for output laser performance [30].…”