title: Nonreciprocal behavior and switching in optical couplers with longitudinally varying coupling coefficient.
abstract: We report the nonreciprocal behavior of an optical coupler consisting of two straight waveguides forming a small angle. An optical diode action is theoretically demonstrated when light is launched along opposite directions. The switching power is lower than the case of parallel waveguides with a constant coupling coefficient.
authors.affiliation: Max Planck Institute for the Science of Light, Erlangen, Germany.
authors.forename: Truong X
authors.initials: TX
authors.lastname: Tran
authors.forename: Fabio
authors.initials: F
authors.lastname: Biancalana