Patent ID: 6519379
Filing Date: 2003-02-11
Classification: G02B,G11B

Abstract:
An optical integrated device for use in an optical pickup device which irradiates a light onto an optical information storage medium and receives a reflected light reflected by the storage medium, the optical integrated device comprising:a light wave coupling element for generating at least a guided light from the reflected light; an optical waveguide unit for propagating the guided light, said optical waveguide unit comprising an optical waveguide laminated structure, which laminated structure comprises multiple optical waveguides that have identical refractive indexes and clad layers formed between the optical waveguides; and a light receiving element for receiving the light from the optical waveguide unit, wherein the optical waveguide unit comprises three or more waveguides, the clad layers have identical refractive indexes, and the optical waveguide of an uppermost layer and the optical waveguide of a lowermost layer have thicknesses larger than thickness of the optical waveguide at intermediate layer between the uppermost layer and the lowermost layer.