title: Approximate band structure calculation for photonic bandgap fibres.
abstract: An approximate method for finding the band structure of simple photonic bandgap fibres is presented. Our simple model is an isolated high-index rod in a circular unit cell with two alternative boundary conditions. Band plots calculated this way are found to correspond closely to calculations using an accurate numerical method.
authors.forename: Timothy A
authors.initials: TA
authors.lastname: Birks
authors.forename: Greg J
authors.initials: GJ
authors.lastname: Pearce
authors.forename: David M
authors.initials: DM
authors.lastname: Bird