A novel large-mode-area Bragg fiber (BF) is proposed for selectively suppressing the amplified spontaneous emission (ASE) of Yb. Confinement loss can be effectively lowered by adding a layer of F-doped glass near the core of this fiber. The BF can achieve effective suppression of ASE of Yb when the bend radius is 0.15 m at wavelength lower than 1.13 \mu m in theory, and eliminate LP11 mode in mode competition in wavelength range of 1.15-1.2 \mu m.
© 2011 Chinese Optics Letters
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(140.3510) Lasers and laser optics : Lasers, fiber
(060.5295) Fiber optics and optical communications : Photonic crystal fibers
Peiguang Yan, Jian Zhao, Shuangchen Ruan, Junqing Zhao, Geguo Du, Huifeng Wei, Xiang Li, and Shengping Chen, "Improved large-mode-area Bragg fiber," Chin. Opt. Lett. 9, 060603- (2011)