The light beam intensity modulation for writing the grating on a fiber is performed by the amplitude mask with Moire pattern. And the LPG(Long Period Grating)is fabricated in chalcogenide fiber with period of 365nm.

• 这种方法是采用莫尔条纹构成模板实现对写入光强的振幅调制 ,在硫化物光纤中写入周期为 36 5nm的长周期光栅。