All Fiber Temperature Sensor Based on TMD Alloy Coated Tapered Fiber

All fiber temperature sensor based on $\mathrm{MoWS}_{2}- \mathrm{rGO}$ coated tapered fiber is demonstrated. The large evanescent field of tapered fiber allows $\mathrm{MoWS}_{2}-\mathrm{rGO}$ coated tapered fiber to absorb the surrounding heat and changes the refractive index of $\mathrm{MoWS}_{2}-\mathrm{rGO}$ coated tapered fiber. The refractive index change is due to thermo-optic effect. When there is a change of surrounding temperature, the refractive index of the coated tapered fiber changes and this subsequently alters the incident light polarization. The sensitivity of the proposed temperature sensor is measured at 0.63°/°C. This is the first demonstration of using $\mathrm{MoWS}_{2}-\mathrm{rGO}$ tapered fiber as temperature sensor.