Theoretical Investigation of Mid-Infrared Temperature Sensing Based on Four-Wave Mixing in a CS2-Filled GeAsSeTe Microstructured Optical Fiber

Due to the unique optical properties and good thermal stability, GeAsSeTe microstructured optical fiber (MOF) offers tremendous opportunity for applications in mid-infrared range (MIR). In this article, we design a CS
₂
-filled GeAsSeTe MOF whose core, inner and outer cladding adopt Ge
₁₅
As
₂₅
Se
₁₅
Te
₄₅
, Ge
₂₀
As
₂₀
Se
₁₇
Te
₄₃
and Ge
₂₀
As
₂₀
Se
₁₅
Te
₄₅
glass, respectively. Highly efficient four-wave mixing (FWM) is realized and ultrabroadband optical parametric gain is obtained. By analyzing the central parametric gain bandwidth change with the temperature variation, this CS
₂
-filled GeAsSeTe MOF is proved to be highly sensitive concerning temperature sensing, the sensitivity being as high as 2.32nm/°C from -80°C to 45°C. Such high temperature sensing property have key prominence for developing optical fiber temperature sensor in MIR region based on FWM. To the best of our knowledge, this is the first study to propose temperature sensing in the MIR by drawing on central parametric gain bandwidth of FWM change in a GeAsSeTe MOF.