Abstract

For small-bend radii, the waveguide condition for total internal reflection is violated in a large angular spread of incident angles at the interface of the fiber core. To account for this, we derived an improved semianalytic bend-loss model that allows for the propagation of radiated fields outside the plane of the fiber bend. This new model is applied to large-mode-area helical-core fibers (which require small-bend radii) for use as high-power fiber lasers and amplifiers. In particular, the limits of scaling the mode area while maintaining good beam quality are explored. Single-mode operation is expected for a 40μm core with a 0.10 numerical aperture, and scaling to a 100μm core diameter is shown to be possible. Additionally, helical fibers are shown to readily perform where conventional coiled fibers are not appropriate to operate long term.

© 2006 Optical Society of America

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Errata

Z. Jiang and J. R. Marciante, "Mode-area scaling of helical-core, dual-clad fiber lasers and amplifiers using an improved bend-loss model: erratum," J. Opt. Soc. Am. B 25, 1105-1105 (2008)
https://www.osapublishing.org/josab/abstract.cfm?uri=josab-25-7-1105

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