Patent Number: 6,166,372

Title: Polarization detection device and method for producing the same

Abstract: A polarization detection device includes a photocoupler; an optical waveguide layer for propagating light from the photocoupler therethrough; a polarization splitter for splitting the propagation light into two components having different refractive angles; and a photodetector formed of a semiconductor material for performing photoelectric conversion on the propagation light split into the two components. The photocoupler, the optical waveguide layer, the polarization splitter, and the photodetector are provided on a single semiconductor substrate. The photocoupler is one of a prism and a beam splitter formed of a dielectric material and supported by the optical waveguide layer only by an adhesive layer, the adhesive layer having a straight edge in the vicinity of the photocoupler. The adhesive layer has a thickness d fulfilling expression (1) where a longer diameter of a beam spot of the light incident on the photocoupler on an interface between the adhesive layer and the optical waveguide layer is L, and the angle of incidence of the light with respect to the optical waveguide layer is .theta.:

Inventors: Yamamoto; Hiroyuki (Kashihara, JP), Yoshida; Yoshio (Nara, JP)

Assignee: Sharp Kabushiki Kaisha

International Classification: G02B 6/34 (20060101); G02B 6/42 (20060101); G02B 6/126 (20060101); G02B 006/34 ()

Expiration Date: 12/26/2013