title: Modal field deformation and transition losses in UV side-written optical fibers.
abstract: The asymmetry of the UV-induced refractive-index profile in photosensitive optical fibers causes a deformation of the modal fields, resulting in transition losses between UV-exposed and unexposed fiber sections up to 0.1 dB for UV-induced index changes of the order of <or=10(-2). A numerical analysis of the transition losses is developed. It is verified experimentally that the loss is caused by coupling of power of the fundamental mode to cladding modes at such a transition.
authors.affiliation: Arbeitsbereich Optik und Messtechnik, Technische Universität Hamburg-Harburg, Eissendorfer Strasse 40, 21073 Hamburg, Germany. renner@tu-harburg.de
authors.forename: H
authors.initials: H
authors.lastname: Renner
authors.forename: D
authors.initials: D
authors.lastname: Johlen
authors.forename: E
authors.initials: E
authors.lastname: Brinkmeyer