Fig. 1. Schematic diagram of the SMF-GIF-NCHCF-GIF-SMF temperature sensor

Fig. 2. The optical path diagrams of the AR and MMI transmission mechanisms in NCHCF cascaded structure

Fig. 3. Mode field distribution of NCHCF

Fig. 4. The simulation results for the loss of core fundamental mode in NCHCF with different wavelengths

Fig. 5. The simulation results for the losses of core fundamental mode in NCHCF at different temperature

Fig. 6. Schematic diagram of temperature sensing experimental setup

Fig. 7. Transmission spectra of the SMF-GIF-NCHCF-GIF-SMF for temperature sensing

Fig. 8. The experimental results of NCHCF temperature sensing based on AR and MMI

Fig. 9. The relationship between wavelength and temperature based on MMI and AR