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:
Jan. 23, 2018
Filed:
Mar. 02, 2017
Applicant:
Fujikura Ltd., Tokyo, JP;
Inventor:
Akira Oka, Sakura, JP;
Assignee:
FUJIKURA LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F 1/035 (2006.01); G02B 6/126 (2006.01); G02B 6/122 (2006.01); G02B 6/125 (2006.01); G02F 1/01 (2006.01);
U.S. Cl.
CPC ...
G02B 6/126 (2013.01); G02B 6/122 (2013.01); G02B 6/125 (2013.01); G02F 1/011 (2013.01); G02F 2203/07 (2013.01);
Abstract
In a substrate-type optical waveguide element, in a case where effective refractive indexes of a TE polarized wave and a TM polarized wave in a first core are defined as N@WG1 and N@WG1, respectively, and effective refractive indexes of a TE polarized wave and a TM polarized wave in a second core are defined as 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 that at an end position of the parallel-core section, and a relative refractive index difference defined by Formula (a) is 0.25 or higher.