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Analytical formulation for the bend loss in single-ring hollow-core photonic crystal fibers

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Frosz,  Michael H.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;
Fibre Fabrication and Glass Studio, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society;

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Roth,  Paul
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Guenendi,  Mehmet C.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Russell,  Philip St. J.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Frosz, M. H., Roth, P., Guenendi, M. C., & Russell, P. S. J. (2017). Analytical formulation for the bend loss in single-ring hollow-core photonic crystal fibers. PHOTONICS RESEARCH, 5(2), 88-91. doi:10.1364/PRJ.5.000088.


Cite as: http://hdl.handle.net/21.11116/0000-0000-7E5A-F
Abstract
Understanding bend loss in single-ring hollow-core photonic crystal fibers (PCFs) is becoming of increasing importance as the fibers enter practical applications. While purely numerical approaches are useful, there is a need for a simpler analytical formalism that provides physical insight and can be directly used in the design of PCFs with low bend loss. We show theoretically and experimentally that a wavelength-dependent critical bend radius exists below which the bend loss reaches a maximum, and that this can be calculated from the structural parameters of a fiber using a simple analytical formula. This allows straightforward design of single-ring PCFs that are bend-insensitive for specified ranges of bend radius and wavelength. It also can be used to derive an expression for the bend radius that yields optimal higher-order mode suppression for a given fiber structure. (C) 2017 Chinese Laser Press