Fig. 1. Structure diagram of sensor

Fig. 2. Cross section and refractive index distribution of FMF

Fig. 3. Physical drawing of packaged sensor

Fig. 4. Analysis of optical transmission mode

Fig. 5. Schematic diagram of experimental system

Fig. 6. Physical drawing of experimental system

Fig. 7. Transmission spectra at different temperatures

Fig. 8. Linear fitting of temperature and wavelength

Fig. 9. Repeatability error of temperature measurement

Fig. 10. Transmission spectra with different refractive indices

Fig. 11. Linear fitting of external refractive index and MZI resonance wavelength

Fig. 12. Repeatability error of refractive index measurement

Fig. 13. Actual measurement spectrum of sensor