Fig. 1. Cross section of the proposed photonic crystal fiber

Fig. 2. Schematic diagram of BDG generation and reading

Fig. 3. Frequency relation of the four waves

Fig. 4. Electric field distribution and energy contour. (a)(b) x polarization; (c)(d) y polarization

Fig. 5. Direction of pressure. (a) Transverse pressure applied along y-polarization axis; (b) transverse pressure applied along x-polarization axis

Fig. 6. Deformation of fiber. (a) Pressure applied along y-polarization axis; (b) pressure applied along x-polarization axis

Fig. 7. Birefringence of the PCF as a function of pressure. (a) Pressure applied along y-polarization axis; (b) pressure applied along x-polarization axis

Fig. 8. Birefringence of the PCF as a function of temperature

Fig. 9. Birefringence-induced frequency shift of the PCF as a function of pressure applied along y-polarization axis

Fig. 10. Reflective spectra with different pressures applied along y-polarization axis for BDG

Fig. 11. Birefringence-induced frequency shift of the PCF as afunction of pressure applied along x-polarization axis

Fig. 12. Reflective spectra with different pressures applied along x-polarization axis for BDG

Fig. 13. Birefringence-induced frequency shift of the PCF as a function of temperature with different pressures

Fig. 14. Reflective spectra with different temperatures

Fig. 15. Birefringence-induced frequency shift of the PCF as a function of pressure with different angles

Fig. 16. Birefringence-induced frequency shift as a function of pressure and temperature with 1%--2% variations of circular air holes diameter. (a) Pressure applied along x-polarization axis; (b) pressure applied along y-polarization axis; (c) temperature