将光纤光栅分成许多薄层，每一薄层中的折射率近似为恒定的。

The whole FBG are separated into multi-films, in each film the refractive index can be see as constant.

youdao

将光纤光栅分成许多薄层，每一薄层中的折射率近似为恒定的。

The whole FBG are separated into multi-films, in each film the refractive index can be see as constant.

youdao