Branching/crossed optical waveguide circuit

Details Branching/crossed optical waveguide circuit Branching/crossed optical waveguide circuit

1997-02-25

1998-10-06

Ullah, Akm E.

Optical waveguides

With optical coupler

Particular coupling structure

385 39, G02B 626

Patent

active

058189890

ABSTRACT:
A branching/crossed optical waveguide circuit includes a main waveguide formed within a clad material on a substrate, and two branching waveguides and that are optically connected to the main waveguide in an optical coupling section. The main waveguide includes a contracting waveguide portion that gradually contracts along its sides while extending longitudinally in the optical coupling section, and the optical coupling is formed by arranging the contracting waveguide portion and the branching waveguides in close proximity to each other and at a prescribed spacing G.sub.gap along the sides of the contracting waveguide. The contracting waveguide portion has a tapered form along both side surfaces, and the branching waveguides in the optical coupling section have expanding waveguide portions that have a tapered form that tapers in the direction opposite that of the main waveguide and that oppose each tapered side of the main waveguide. The optical axes of the expanding waveguides are parallel with the optical axis of the contracting waveguide in the optical coupling section.

REFERENCES:
patent: 3822412 (1974-07-01), Kelly
patent: 4468680 (1984-08-01), Martner
patent: 4675633 (1987-06-01), Young
patent: 4904037 (1990-02-01), Imoto et al.
patent: 5428702 (1995-06-01), Schoss
patent: 5684297 (1997-11-01), Tardy

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