title: The Asymmetric Active Coupler: Stable Nonlinear Supermodes and Directed Transport.
abstract: We consider the asymmetric active coupler (AAC) consisting of two coupled dissimilar waveguides with gain and loss. We show that under generic conditions, not restricted by parity-time symmetry, there exist finite-power, constant-intensity nonlinear supermodes (NS), resulting from the balance between gain, loss, nonlinearity, coupling and dissimilarity. The system is shown to possess non-reciprocal dynamics enabling directed power transport functionality.
authors.affiliation: School of Applied Mathematical and Physical Science, National Technical University of Athens, Athens, Greece.
authors.forename: Yannis
authors.initials: Y
authors.lastname: Kominis
authors.affiliation: Department of Mathematics, University of Patras, Patras, Greece.
authors.forename: Tassos
authors.initials: T
authors.lastname: Bountis
authors.affiliation: Center for Theoretical Physics of Complex Systems, Institute for Basic Science, Daejeon, Korea.|New Zealand Institute for Advanced Study, Centre for Theoretical Chemistry &Physics, Massey University, Auckland, New Zealand.
authors.forename: Sergej
authors.initials: S
authors.lastname: Flach