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:
Oct. 19, 2004
Filed:
May. 06, 2002
Yasuyuki Miyama, Chiba, JP;
Hirotoshi Nagata, Chiba, JP;
Toshihiro Sakamoto, Chiba, JP;
Tetsuya Fujino, Chiba, JP;
Sumitomo Osaka Cement Co., Ltd., Tokyo, JP;
Abstract
An optical waveguide is formed on a substrate made of a material with an electro-optic effect. Then, an intermediate layer is fabricated, on the main surface of the substrate, by a dielectric material selected from the group consisting of AOx, B Oy, COz (A: divalent element, B: trivalent element, C: quadrivalent element, 0<x<1, 0<y<3, 0<z<2, O: oxygen). Then, a metal-cladding type optical polarizer is fabricated on the intermediate layer and the optical waveguide. A buffer layer is formed and partially removed by non-reactive dry-etching to form a first opening. Subsequently, a metal-cladding type optical polarizer is fabricated inside the first opening, and a signal electrode and a ground electrode, constituting a modulation electrode, are fabricated on the buffer layer.