title: Coupling of planar waveguides with hyperbolic secant refractive-index profiles by butt joining: beam-size controller design.
abstract: An analysis of the butt-joining coupling between two inhomogeneous planar optical waveguides with hyperbolic secant refractive-index profiles is made from the point of view of geometrical optics. Furthermore, the design of a new device to contract or expand a collimated beam is presented, and a relationship between sizes of the input and output beams is obtained.
authors.forename: C
authors.initials: C
authors.lastname: Bao
authors.forename: M V
authors.initials: MV
authors.lastname: Pérez
authors.forename: C
authors.initials: C
authors.lastname: Gómez-Reino