Gain guiding in large-core Bragg fibers
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Updated: Jun 17, 2026

Writing Bragg Gratings in Multicore Fibers
Published on: April 20, 2016
Xianyu Ao1, Tsing-Hua Her, Lee W Casperson
1Department 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.
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.
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