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, 2017
Filed:
Mar. 02, 2017
Fujikura Ltd., Tokyo, JP;
Akira Oka, Sakura, JP;
FUJIKURA LTD., Tokyo, JP;
Abstract
Provided is a substrate-type optical waveguide element in which when (i) effective refractive indexes of a TE polarized wave and a TM polarized wave in the first core are N@WG1 and N@WG1, respectively, and (ii) effective refractive indexes of a TE polarized wave and a TM polarized wave in the second core are N@WG2 and N@WG2, respectively, a magnitude relation of the effective refractive indexes N@WG1 and N@WG2 at a start position of a parallel-core section is opposite to a magnitude relation of the effective refractive indexes N@WG1 and N@WG2 at an end position of the parallel-core section, and at least one of the cores includes (a) a main part having a quadrilateral cross section and (b) a protruding part protruding from one of side surfaces of the main part in a direction parallel to a boundary surface between a lower cladding and a upper cladding.