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. 14, 2025
Filed:
Nov. 19, 2018
Mitsubishi Electric Corporation, Tokyo, JP;
Hiroaki Maehara, Tokyo, JP;
Ayumi Fuchida, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
There is provided a configuration which includes: a burying layer which has a current narrowing window where portions protruding onto a top part of a ridge stripe are opposed to each other with an interval therebetween narrower than a width of the top part; and a diffraction grating in which a λ/4 phase shifter is placed at an intermediate portion in a light traveling direction; wherein a sectional shape of the current narrowing window varies depending on a position in the light traveling direction so that, at a region where the λ/4 phase shifter is placed, a resistance of a current path from a second cladding layer to a first cladding layer through the current narrowing window is minimum.