title: Perturbation analysis for the design of an optically controlled fiber-optic directional coupler.
abstract: A simple analysis is presented for calculating the change in the effective index of a guided mode in an optical fiber with reduced cladding surrounded by an optically nonlinear medium. Using first-order perturbation theory, the optical power required to alter the phase-matched condition in a fiber directional coupler incorporating a nonlinear medium is therefore calculated. This may then be applied to an optically controlled switch, the output of which may be transferred from one port to another by application of a high-intensity pulse. This method may be applied to other fiber components, for example, fiber gratings and polarizers.
authors.forename: D F
authors.initials: DF
authors.lastname: Clark
authors.forename: I
authors.initials: I
authors.lastname: Andonovic
authors.forename: B
authors.initials: B
authors.lastname: Cuishaw