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:
Aug. 20, 2019
Filed:
Apr. 24, 2013
Furukawa Electric Co., Ltd, Tokyo, JP;
Kazutaka Nara, Tokyo, JP;
Takashi Inoue, Tokyo, JP;
Noritaka Matsubara, Tokyo, JP;
Hiroshi Kawashima, Tokyo, JP;
FURUKAWA ELECTRIC CO., LTD, Tokyo, JP;
Abstract
An optical waveguide circuit includes a polarization beam splitter connecting to a first input optical waveguide; an optical interference element receiving one of orthogonally polarization-split lights of a first light from the polarization beam splitter, and one of orthogonally-polarized lights from a second light input to a second input optical waveguide, the optical interference element causing interference therebetween; a first connection optical waveguide connecting the polarization beam splitter and the optical interference element; and a second connection optical waveguide connecting the second input optical waveguide and the optical interference element. The first and the second input optical waveguides have a straight-line shape or an S-shape including a first bending portion and a second bending portion to cancel the polarization-rotation of light taking place in the first bending portion. The polarization beam splitter, the first and the second connection optical waveguides, and the optical interference element are arranged in an S-shape.