Fig. 1. (a) Side view micrograph of the left and right splicing points of the in-line MZI; (b) confronted view micrograph of the MZI in air

Fig. 2. Transmission spectra of the interference in air and water

Fig. 3. (a) Interference spectra at different RI values and (b) spectral RI response of the proposed RI sensor

Fig. 4. Schematic diagram of the magnetic field sensor. Inset is the cross-sectional view of the U-shaped cavity, combined with an MF sealed into a capillary

Fig. 5. (a) Variation of a dip spectrum with the applied magnetic field. (b) Loss peak a, b, c, d wavelength as a function of the magnetic field strength. (c) (d) Loss peak a wavelength shift as a function of magnetic field strength