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:
Aug. 26, 2008
Filed:
Jun. 29, 2005
Yoshiyuki Abe, Chiba, JP;
Hiroshi Mori, Tokyo, JP;
Akira Terashima, Chiba, JP;
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Abstract
A waveguide type optical control element which has an optical waveguide made of an insulating material having an electro-optic effect or a thermo-optic effect, and a control electrode provided in contact with or proximity to the optical waveguide; the optical waveguide having a propagation loss which is 1 dB/cm or less at wavelengths of from 1.3 μm to 1.6 μm. The control electrode is constituted of a conductive oxide film having a carrier electron concentration of 5.5×10/cmor less and a resistivity of 9.5×10Ωcm or less, and the conductive oxide film has a coefficient of extinction of light waves, of 0.240 or less at a wavelength of 1.55 μm.