title: Representation of codirectional coupled waves.
abstract: The evolution of the amplitudes of two general, codirectional coupled waves is represented as a rotation of a generalized Poincaré sphere in analogy to polarized light. The method permits simple, pictorial representation of coupling effects in directional couplers and "monomode" optical fibers.
authors.forename: R
authors.initials: R
authors.lastname: Ulrich