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Opt Express. 2011 Nov 7;19(23):22628-36. doi: 10.1364/OE.19.022628.

Large-mode-area photonic crystal fiber with double lattice constant structure and low bending loss.

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1
Vrije Universiteit Brussel, Department of Applied Physics and Photonics, Pleinlaan 2, 1050 Brussel, Belgium. marek.napierala@b-phot.org

Abstract

We report on a bendable photonic crystal fiber for short pulse high power fiber laser applications. This fiber uses a double lattice structure and enables single mode operation with a very large mode area that reaches 1454 µm² when the fiber is kept straight and 655 µm² in the fiber bent around a 10 cm radius. Single mode operation is enforced by the very large bending loss in excess of 50 dB/m experienced by the higher order modes, whilst bending loss for the fundamental mode is smaller than 0.01 dB/m. We outline the principles of our fiber design and we explore the guiding properties of the fiber.

PMID:
22109143
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