title: Coupled-mode formulations.
abstract: Vector coupled-mode theory is extended beyond the conventional first-order treatment. Good results are obtained from the extended theory in the case of waveguides with large index discontinuity.
authors.forename: H A
authors.initials: HA
authors.lastname: Haus
authors.forename: W P
authors.initials: WP
authors.lastname: Huang
authors.forename: A W
authors.initials: AW
authors.lastname: Snyder