A novel method for writing long fiber Bragg grating (FBG) with arbitrary multi-wavelength and chirp at the same place of a fiber by using a phase mask is presented. An experimental equation is derived for Bragg wavelength, and the Bragg wavelength is found to be a function of the distance between the fiber and the phase mask. The chirp of the overlapped FBG is decided by the angle between phase mask and fiber. A multi-wavelength FBG with 4, 8, 16 channels has been written by using a unique phase mask.
© 2005 Chinese Optics Letters
Tigang Ning, Liu Yan, Zhongwei Tan, Li Pei, Yongjun Fu, and Shuisheng Jian, "A novel way to write fiber Bragg gratings with controllable wavelength and chirp using a phase mask," Chin. Opt. Lett. 1, 199-201 (2003)