C. Bao et al., COUPLING OF PLANAR WAVE-GUIDES WITH HYPERBOLIC SECANT REFRACTIVE-INDEX PROFILES BY BUTT JOINING - BEAM-SIZE CONTROLLER-DESIGN, Optics letters, 21(14), 1996, pp. 1078-1080
An analysis of the butt-joining coupling between two inhomogeneous pla
nar optical waveguides with hyperbolic secant refractive-index profile
s is made from the point of view of geometrical optics. Furthermore, t
he design of a new device to contract or expand a collimated beam is p
resented, and a relationship between sizes of the input and output bea
ms is obtained. (C) 1996 Optical Society of America