Table 2: Material parameters of FBG.
| Symbol | Quantity | Value |
| Ef | Elasticity modulus of fiber | 7.2 × 1010 Pa |
| v | Passion ratio of fiber | 0.17 |
| pij | The photo-elastic constant | P11 = 0.121, P12 = 0.27 |
| lf | Length of grating area | 10 mm |
| λB | Initial center wavelength | 1550.0825 nm |