Fig. 1. Schematic of hybrid cascaded configuration with PMI and FSI

Fig. 2. Fusion images of fiber optic. (a) Splice of panda PMFs at an angle of 45°; (b) splice of SMF and ECPMF

Fig. 3. Simulated output spectra of sensors. (a) FSI spectrum , PMI spectrum and its movement; (b) spectra and its movement of cascaded sensor

Fig. 4. Experimental setup of temperature sensing

Fig. 5. Measured interference spectra. (a) Single FSI and PMI; (b) cascaded sensor

Fig. 6. Interference spectra of the sensor under different temperatures. (a) Single PMI; (b) cascaded sensor

Fig. 7. Relationship between wavelength shift and temperature. (a) Single PMI; (b) cascaded sensor

Fig. 8. Temperature response of FSI. (a) Spectra shift; (b) relationship between wavelength shift and temperature

Fig. 9. Schematic of electric displacement platform

Fig. 10. Interference spectra of the sensor under different strains. (a) Single PMI; (b) cascaded sensor

Fig. 11. Relationship between wavelength shift and strain. (a) Single PMI; (b) cascaded sensor

Fig. 12. Strain response of FSI. (a) Interference spectra; (b) relationship between wavelength shift and strain