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:
May. 18, 2021
Filed:
Mar. 15, 2019
Nec Corporation, Tokyo, JP;
Photonics Electronics Technology Research Association, Tokyo, JP;
Junichi Fujikata, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
PHOTONICS ELECTRONICS TECHNOLOGY RESEARCH ASSOCIATE, Tokyo, JP;
Abstract
An electro-absorption optical modulator capable of realizing optical coupling with a Si waveguide with high efficiency, improving modulation efficiency, reducing light absorption by an electrode layer and achieving low optical loss includes a substrate; a first silicon layer doped to exhibit a first type of conductivity and a second silicon layer doped to exhibit a second type of conductivity that are disposed parallel to the substrate; and a GeSi(0<x<1)/Si stack in which a GeSilayer and a Si layer are stacked on the first and second silicon layers in this order.