Method of coupling external light into an optical waveguide and

Details Method of coupling external light into an optical waveguide and Method of coupling external light into an optical waveguide and

1989-12-18

1992-01-14

Envall, Jr., Roy N.

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With servo positioning of transducer assembly over track...

Optical servo system

369112, 350 9613, 350 9611, 385 37, G11B 700

Patent

active

050816152

ABSTRACT:
A guided wave is coupled from an optical waveguide through a grating coupler, or an external light beam is coupled into an optical waveguide through a grating coupler. The grating coupler is disposed on a surface of the optical waveguide. The external light beam is diffracted by a wavelength-fluctuation-correcting grating in a direction opposite to the direction of diffraction by the grating coupler on the surface of the optical waveguide, while satisfying the Bragg condition or a predetermined equation. Alternatively, the external light beam is passed through an end surface of the substrate of the optical waveguide so that the light is refracted in the same direction as the direction of diffraction by the grating coupler on the surface of the optical waveguide, the end surface being inclined with respect to the optical waveguide at a certain angle. Optical pickups employing an optical waveguide are also disclosed.

REFERENCES:
patent: 4833561 (1989-05-01), Sunagawa et al.
patent: 4885732 (1989-12-01), Sunagawa et al.
patent: 4971414 (1990-11-01), Funato et al.

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