title: Gain guiding in large-core Bragg fibers.
abstract: We theoretically analyze gain guiding in large-core Bragg fibers, to be used for large-mode-area laser amplifiers with single-transverse-mode operation. The signal is gain-guided in a low-index core, whereas the pump is guided by the photonic bandgap of the Bragg cladding to achieve good confinement. The high-index layers in the Bragg cladding are half-wave thick at the signal wavelength in order to eliminate Bragg reflection, reducing the Bragg fiber effectively to a step-index fiber for gain guiding.
authors.affiliation: Department of Physics and Optical Science, Center for Optoelectronics and Optical Communications, The University of North Carolina at Charlotte, 9201 University City Boulevard, Charlotte, NC 28223, USA.
authors.forename: Xianyu
authors.initials: X
authors.lastname: Ao
authors.forename: Tsing-Hua
authors.initials: TH
authors.lastname: Her
authors.forename: Lee W
authors.initials: LW
authors.lastname: Casperson
mesh_terms: D000669:Amplifiers, Electronic; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*