Patent ID: 6134361
Filing Date: 2000-10-17
Classification: G02B

Abstract:
An optical multiplexer/demultiplexer comprising:a substrate formed from a material with a uniform refractive index;a first and a second waveguide which are mounted to the substrate and are formed from a material with a refractive index higher than the substrate; anda directional coupler that is formed by placing each portions the first and second waveguides in close proximity to each other at a preselected length;wherein, each of the portions of said first and second waveguides are bisected into an upper region and a lower region in the one direction the light waves propagate; andthe propagation constant of the upper region of said first waveguide is set to be higher than the other portion and the propagation constant of the lower region of said second waveguide is set to be higher than the other portion.