We present a method to optimize the flat-band long-period fiber Bragg grating (FBG) in this letter. The method is based on the particle swarm optimization method and the matrix transmission method. The optimized refractive modulation profile does not introduce so many phase shifts and is easier to fabricate compared with that of layer-peeling method which introduces lots of ? phase shift at each zero point of apodization profile in designing for the same problem.
© 2005 Chinese Optics Letters
(050.2770) Diffraction and gratings : Gratings
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.5060) Fiber optics and optical communications : Phase modulation
Yumin Liu, Zhongyuan Yu, Jianzhong Zhang, Bojun Yang, and Xiaoguang Zhang, "Optimization design of flat-band long-period grating," Chin. Opt. Lett. 2, 200-202 (2004)