This phenomenon coincides with Braggequation and the law of refraction.
这一现象与布拉格方程和折射定律所得结果一致。
2
The formulas for strain quantity and fringe spacing on the basis of Braggequation are derived. The relationship between fringe deformation and internal flaws is analysed.
Firstly, basic transmission equation of transmitted light is given using coupled-mode theory in Fiber Bragg Gratings and physics meaning of every parameter is given.