We propose and demonstrate a novel approach in optical fiber design in which the optical waveguide is formed by a ring of large air holes surrounding a solid silica core. With an appropriate choice of the geometrical configuration, robust single-transverse-mode propagation with a record effective area of 1417 μm<sup>2</sup>, verified by various methods, was demonstrated. A breakthrough was made toward the development of practical ultra-high-power fiber lasers as we observed negligible loss of the fiber at bending diameters as small as 15 cm.
© 2005 Optical Society of America
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(140.3510) Lasers and laser optics : Lasers, fiber
Fiber Optics and Optical Communications
William S. Wong, Xiang Peng, Joseph M. McLaughlin, and Liang Dong, "Breaking the limit of maximum effective area for robust single-mode propagation in optical fibers," Opt. Lett. 30, 2855-2857 (2005)