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. 10, 2005
Filed:
May. 23, 2002
Kenji Kawano, Atsugi, JP;
Toru Nakahira, Atsugi, JP;
Seiji Uchida, Atsugi, JP;
Masaya Nanami, Zama, JP;
Yuji Sato, Atsugi, JP;
Kenji Kawano, Atsugi, JP;
Toru Nakahira, Atsugi, JP;
Seiji Uchida, Atsugi, JP;
Masaya Nanami, Zama, JP;
Yuji Sato, Atsugi, JP;
Anritsu Corporation, Tokyo, JP;
Abstract
An optical waveguide for guided an incident light is formed on a substrate having an electro-optic effect. A first buffer layer is formed to cover an upper surface of the substrate. A conductive film is formed above the first buffer layer. A center electrode and a ground electrode are formed for applying a voltage in order to induce an electric field in the optical waveguide. A second buffer layer is formed between the conductive film and at least one of the center electrode and the ground electrode. The conductive film is formed to be present on at least a part below the ground electrode. A light guided through the optical waveguide is modulated by changing a phase by a voltage applied to the optical waveguide. Thereby, a thermal drift can be effectively restricted so that an optical modulation device having excellent electric characteristics can be realized.