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. 25, 2022
Filed:
Jan. 15, 2021
Applicant:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Inventors:
Takuya Okimoto, Osaka, JP;
Hideki Yagi, Osaka, JP;
Assignee:
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/26 (2006.01); G02B 6/12 (2006.01); G02B 6/293 (2006.01);
U.S. Cl.
CPC ...
G02B 6/266 (2013.01); G02B 6/12019 (2013.01); G02B 6/2935 (2013.01);
Abstract
A photo detector includes a variable optical attenuator provided on a substrate, an optical 90-degree hybrid device provided on the substrate, and a plurality of photodiodes provided on the substrate. The plurality of photodiodes are optically coupled to the variable optical attenuator via the optical 90-degree hybrid device. The variable optical attenuator includes an optical waveguide disposed on the substrate, a heater configured to heat the optical waveguide, and an insulating layer at least partially disposed between the substrate and the optical waveguide.