Temperature sensor based on multi-layer MoS2 coated etched fiber Bragg grating

The development of an etched fiber Bragg grating (eFBG)-based temperature sensor with a uniform multi-layer molybdenum-di-sulphide (MoS2) coating is presented in this paper. Multi-layer MoS2 has been coated on clad etched FBG sensors by DC magnetron sputtering of molybdenum (Mo) and subsequent sulfurization. The dependence of temperature sensitivity on the coating thickness of MoS2 on eFBGs has been tested from room temperature to 100 degrees C. It has been found that MoS2 coated clad etched FBG sensors with a coating thickness of around 10 tun exhibit a maximum temperature sensitivity of similar to 95 pm/degrees C (almost one order higher than that of bare fiber Bragg gratings), with a resolution of similar to 0.01 degrees C obtained using an FBG interrogator with 1 pm resolution. (C) 2019 Optical Society of America