title: Photonic crystal fiber with a hybrid honeycomb cladding.
abstract: We consider an air-silica honeycomb lattice and demonstrate a new approach to the formation of a core defect. Typically, a high or low-index core is formed by adding a high-index region or an additional air-hole (or other low-index material) to the lattice, but here we discuss how a core defect can be formed by manipulating the cladding region ratherthan the core region itself. Germanium-doping of the honeycomb lattice has recently been suggested for the formation of a photonic band-gap guiding silica-core and here we experimentally demonstrate how an index-guiding silica-core can be formed by fluorine-doping of the honeycomb lattice.
authors.forename: Niels
authors.initials: N
authors.lastname: Mortensen
authors.forename: Martin
authors.initials: M
authors.lastname: Nielsen
authors.forename: Jacob
authors.initials: J
authors.lastname: Folkenberg
authors.forename: Christian
authors.initials: C
authors.lastname: Jakobsen
authors.forename: Harald
authors.initials: H
authors.lastname: Simonsen