Fig. 1. Excitation process of BDG

Fig. 2. (a) Three-dimensional schematic of this photonic crystal fiber; (b) Cross-section schematic of this photonic crystal fiber

Fig. 3. (a) Electric field distribution in the y polarization axis; (b) Electric field distribution in the x polarization axis

Fig. 4. (a) Pressure applied along the y-axis; (b) Pressure applied along the x-axis

Fig. 5. (a) Cross-sectional variation when force is applied along the y-axis of this fiber; (b) Cross-sectional variation when force is applied along the x-axis of this fiber

Fig. 6. Variation of birefringence with pressure when pressure is applied along the x-axis of this fiber

Fig. 7. Variation of birefringence with pressure when pressure is applied along the y-axis of this fiber

Fig. 8. Variation of birefringence frequency shift when pressure is applied along the x-axis of this fiber

Fig. 9. Variation of birefringence frequency shift when pressure is applied along the y-axis of this fiber

Fig. 10. Variation of BDG when pressure is applied along the x-axis

Fig. 11. Variation of BDG when pressure is applied along the y-axis

Fig. 12. Variation of fiber birefringence coefficient with temperature

Fig. 13. Variation of birefringence frequency shift with temperature at different pressures

Fig. 14. Variation of BDG frequency shift at different temperatures

Fig. 15. Schematic diagram of force application angle

Fig. 16. Variation of birefringence frequency shift with the angle of force application

Fig. 17. Variation of pressure sensitivity with angle of application and fitted curves