title: Endlessly single-mode holey fibers: the influence of core design.
abstract: In this paper we evaluate the cut-off properties of holey fibers (HFs) with a triangular lattice of air holes and the core formed by the removal of a single (HF1) or more air holes (HF3 and HF7). With the aid of finite-element simulations we determine the single-mode and multi-mode phases and also find the air hole diameters limiting the endlessly single-mode regime. From calculations of V and W parameters we find that in general HF1 is less susceptible to longitudinal non-uniformities compared to the other designs for equivalent effective areas. As an example we illustrate this general property for the particular case of a macro-bending induced loss.
authors.forename: Kunimasa
authors.initials: K
authors.lastname: Saitoh
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Tsuchida
authors.forename: Masanori
authors.initials: M
authors.lastname: Koshiba
authors.forename: Niels Asger
authors.initials: NA
authors.lastname: Mortensen