| 摘要 |
The present invention is related to an optical multiplexer/demultiplexer that has a wide wavelength passing band. This optical multiplexer/demultiplexer includes 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, and a directional coupler that is formed by placing each portions the first and second waveguides in close proximity to each other at a preselected length. Each of the portions of the first and second waveguides which are in close proximity are bisected into an upper region and a lower region in the one direction the light waves propagate. The propagation constant of the upper region of the first waveguide is set to be higher than the other portion and the propagation constant of the lower region of the second waveguide is set to be higher than the other portion. This allows expansion of the wavelength passing band.
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