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.
© 1996 Optical Society of America
Original Manuscript: January 16, 1996
Published: July 15, 1996
C. Bao, M. V. Pérez, and C. Gómez-Reino, "Coupling of planar waveguides with hyperbolic secant refractive-index profiles by butt joining: beam-size controller design," Opt. Lett. 21, 1078-1080 (1996)