Bend distortion in large-mode-area amplifier fiber design

John M. Fini

doi:10.1117/12.745949

21 November 2007 Bend distortion in large-mode-area amplifier fiber design

John M. Fini

Proceedings Volume 6781, Passive Components and Fiber-based Devices IV; 67810E (2007) https://doi.org/10.1117/12.745949
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

As fibers with ever increasing mode area are used to enable high power fiber amplifiers and lasers, it important to use realistic models of bending in fiber design. The standard approach is to consider only the bend-induced losses and mode-coupling when designing an amplifier, even though changes in mode shape are well known in principle. But even coiling a fiber to fit into a reasonable package size produces large bend-induced distortion for fibers with large mode area. Here, several recent results are reviewed. Distortion significantly impacts amplifier performance by reducing the area, and can further degrade the interaction of light with the gain. Scaling rules for the distortion are derived from an intuitive sensitivity model. Bend distortion considerations lead to new strategies for large mode area fiber design, and cast existing strategies in a new light.

Citation Download Citation

John M. Fini "Bend distortion in large-mode-area amplifier fiber design", Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 67810E (21 November 2007); https://doi.org/10.1117/12.745949

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