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:
Sep. 10, 2013
Filed:
Feb. 28, 2011
Jun Ushida, Minato-ku, JP;
Junichi Fujikata, Minato-ku, JP;
Ming-bin Yu, Singapore, SG;
Liang Ding, Singapore, SG;
Shiyang Zhu, Singapore, SG;
Jun Ushida, Minato-ku, JP;
Junichi Fujikata, Minato-ku, JP;
Ming-Bin Yu, Singapore, SG;
Liang Ding, Singapore, SG;
ShiYang Zhu, Singapore, SG;
NEC Corporation, Tokyo, JP;
Abstract
In an electro-optic device, a stack structure including a first silicon layer of a first conductivity type and a second silicon layer of a second conductivity type has a rib waveguide shape so as to form an optical confinement area, and a slab portion of a rib waveguide includes an area to which a metal electrode is connected. The slab portion in the area to which the metal electrode is connected is thicker than a surrounding slab portion. The area to which the metal electrode is connected is set so that a range of a distance from the rib waveguide to the area to which the metal electrode is connected is such that when the distance is changed, an effective refractive index of the rib waveguide in a zeroth-order mode does not change.