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Updated: Jun 17, 2026

Writing Bragg Gratings in Multicore Fibers
Published on: April 20, 2016
Gain guiding in large-core Bragg fibers
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.
We analyzed gain guiding in large-core Bragg fibers for laser amplifiers. The design enables single-transverse-mode operation by gain-guiding the signal and using photonic bandgap confinement for the pump.
Area of Science:
- Optics and Photonics
- Laser Physics
Background:
- Large-mode-area fiber amplifiers are crucial for high-power lasers.
- Achieving single-transverse-mode operation in large-core fibers remains a challenge.
Purpose of the Study:
- To theoretically analyze gain guiding in large-core Bragg fibers.
- To enable single-transverse-mode operation in large-mode-area laser amplifiers.
Main Methods:
- Theoretical analysis of light propagation in Bragg fibers.
- Modeling of gain guiding for the signal in a low-index core.
- Photonic bandgap guiding for the pump in the Bragg cladding.
Main Results:
- The signal is effectively gain-guided within the low-index core.
- The pump is confined by the photonic bandgap of the Bragg cladding.
- Optimized high-index layers (half-wave thick) eliminate Bragg reflection, simplifying the fiber to a step-index equivalent for gain guiding.
Conclusions:
- Gain guiding in large-core Bragg fibers is a viable mechanism for single-transverse-mode operation.
- This approach facilitates the development of large-mode-area laser amplifiers with improved beam quality.
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