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. 30, 2024
Filed:
Jul. 09, 2019
Applicant:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Inventors:
Junji Sakamoto, Musashino, JP;
Toshikazu Hashimoto, Musashino, JP;
Assignee:
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/12 (2006.01); G02B 6/125 (2006.01);
U.S. Cl.
CPC ...
G02B 6/12014 (2013.01); G02B 6/125 (2013.01); G02B 2006/12038 (2013.01); G02B 2006/12147 (2013.01);
Abstract
Provided is a planar lightwave circuit in which stress on a substrate is reduced to decrease the curve of the substrate. The planar lightwave circuit is formed by layering a glass film on the substrate. When the optical axis direction from an input waveguide toward an output waveguide is in the longitudinal direction of the substrate, a plurality of grooves are formed in a line in the transverse direction of the substrate.