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:
Oct. 08, 2002
Filed:
Mar. 21, 2000
Hiromi Takahashi, Tokyo, JP;
Hideki Ono, Tokyo, JP;
Oki Electric Industrial Co., Ltd., Tokyo, JP;
Abstract
In order to reduce the degree to which transmission loss occurs at the branching portion in a Y-branch structure provided at an optical integrated circuit device, the Y-branch structure through which a light signal input through an input waveguide is branched and transmitted into two output waveguides adopts the following features. The Y-branch structure is provided with a tapered waveguide having an input surface with a waveguide width a equal to the width of the input waveguide which is connected flush to the input waveguide and an output surface having a waveguide width W (>2a+g) is larger than a width 2a+g achieved by adding a width g of the gap between the output waveguides to a width 2a equal to the total of the widths of the two output waveguides each having a waveguide width a equal to the width of the input waveguide, which is connected with the two output waveguides via a stage.