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:
Apr. 25, 2006
Filed:
Feb. 28, 2005
Tohru Sugamata, Chiba, JP;
Yoshihiro Hashimoto, Chiba, JP;
Tohru Sugamata, Chiba, JP;
Yoshihiro Hashimoto, Chiba, JP;
Sumitomo Osaka Cement Co., Ltd., Tokyo, JP;
Abstract
A first branched optical waveguide and a second branched optical waveguide, to constitute a Mach-Zehnder type optical waveguide, are formed at the surface of a substrate. A first ground electrode, a signal electrode and a second ground electrode are provided on a buffer layer formed on the substrate. The second ground electrode is partially cut away and divided, to form a ditch therein, so that the modulating electrode composed of the signal electrode, the first and the second ground electrodes are substantially symmetrized on the center line between the first and the second optical waveguides. Then, the ratio (d/d) of the distance dbetween the signal electrode and the second branched optical waveguide to the distance dbetween the signal electrode and the first electrode is set within 3.5–7.5.