The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 2000
Filed:
May. 27, 1998
Hiroyuki Yamamoto, Kashihara, JP;
Yoshio Yoshida, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
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.: