Numerical demonstration of mid-infrared temperature sensing by soliton self-frequency shift in a fluorotellurite microstructured fiber

We theoretically proposed the concept of temperature sensing using the soliton self-frequency shift (SSFS) effect in a fluorotellurite microstructured fiber (FTMF) which had one ring of six alcohol-infiltrated air holes. The glass material for the fiber core was 70TeO 2 –20BaF 2 –10Y 2 O 3 and the cladding AlF 3 –BaF 2 –CaF 2 –YF 3 –SrF 2 –MgF 2 –TeO 2 . Based on SSFS effect, temperature sensing in the mid-infrared (MIR) region was achieved by detecting the wavelength shift of solitons with the variation of temperature. Using a 2800 nm fiber laser with a pulse width of 131 fs as the pump light and a 0.5-m-long FTMF as the nonlinear media, the temperature sensing sensitivity could be as high as 2.09 nm/°C. To the best of our knowledge, this is the first study concerning temperature sensing in the MIR region by drawing on SSFS effect in a non-silica FTMF.