Optical waveguide, optical device, and manufacturing method...

Details Optical waveguide, optical device, and manufacturing method... Optical waveguide, optical device, and manufacturing method...

2006-11-20

2008-12-09

Connelly-Cushwa, Michelle R. (Department: 2874)

Optical waveguides

Planar optical waveguide

C385S132000

Reexamination Certificate

active

07463808

ABSTRACT:
An optical waveguide is formed by diffusing a second impurity to form a second diffusion area having a large refractive index on a substrate. A groove is formed at a portion of the substrate corresponding to an outside of a bend of a bent portion along the second diffusion area. A first diffusion area is formed by diffusing a first impurity from a bottom of the groove to reduce a refractive index of the substrate.

REFERENCES:
patent: 4810049 (1989-03-01), Fischer et al.
patent: 7177490 (2007-02-01), Sugiyama et al.
patent: 2002/0146190 (2002-10-01), Doi et al.
patent: 63-157109 (1988-06-01), None
patent: 01-201609 (1989-08-01), None
patent: 03-148625 (1991-06-01), None

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