title: Improved large-mode-area endlessly single-mode photonic crystal fibers.
abstract: We numerically study the possibilities for improved large-mode-area endlessly single-mode photonic crystal fibers for use in high-power delivery applications. By carefully choosing the optimal hole diameter, we find that a triangular core formed by three missing neighboring air holes considerably improves the mode area and loss properties compared with the case with a core formed by one missing air hole. In a realized fiber we demonstrate an enhancement of the mode area by approximately 30% without a corresponding increase in the attenuation.
authors.affiliation: Crystal Fibre A/S, Blokken 84, DK-3460 Birkerød, Denmark. nam@crystal-fibre.com
authors.forename: N A
authors.initials: NA
authors.lastname: Mortensen
authors.forename: M D
authors.initials: MD
authors.lastname: Nielsen
authors.forename: J R
authors.initials: JR
authors.lastname: Folkenberg
authors.forename: A
authors.initials: A
authors.lastname: Petersson
authors.forename: H R
authors.initials: HR
authors.lastname: Simonsen