Fig. 1. Structural diagram and lightpath diagram of MZI. (a) Structural diagram; (b) lightpath diagram

Fig. 2. Transmission spectrum and spatial frequency spectrum of MZI. (a) Transmission spectrum; (b) spatial frequency spectrum

Fig. 3. Schematic diagrams of bending and axial strain experimental equipments and offset splicing section. (a) Schematic diagram of bending and axial strain experimental equipments; (b) schematic diagram of offset splicing section

Fig. 4. Position of Dip1 varying with C whenMZI bends to different directions. (a) 0°; (b) 90°; (c) 180°; (d) 270°

Fig. 5. Position of Dip1 varying with C whenMZI bends to direction of 45°

Fig. 6. Central wavelength of Dip1 varying with C when MZI bends to different directions. (a) Four specific directions; (b) 45°

Fig. 7. Position and wavelength of Dip2 varying with C whenMZI bends to direction of 0°. (a) Position of Dip2 varying with C; (b) wavelength of Dip2 varying with C

Fig. 8. Position and wavelength of Dip1 varying with axial strain whenMZI bends to direction of 0°. (a) Position of Dip1 varying with axial strain; (b) wavelength of Dip1 varying with axial strain

Fig. 9. Position and wavelength of Dip2 varying with axial strain whenMZI bends to direction of 0°. (a) Position of Dip2 varying with axial strain; (b) wavelength of Dip2 varying with axial strain

Fig. 10. Relationship between wavelength and C in experiment of repeatability and stability