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. 10, 2010
Filed:
Apr. 19, 2007
Kaoru Higuma, Chiyoda-ku, JP;
Toshio Sakane, Chiyoda-ku, JP;
Kaoru Higuma, Chiyoda-ku, JP;
Toshio Sakane, Chiyoda-ku, JP;
Sumitomo Osaka Cement Co., Ltd., Chiyoda-ku, Tokyo, JP;
Abstract
Light having components of frequencies f, fand foutputted from an optical modulator () is monitored, a second light detection means () measures the power Pof all the components, and a first light detection means () measures the power Pwith frequency fcomponent cut out by a filter means (). Based on these light receiving powers (P) and (P), phase differences imparted by the respective DC electrodes of Mach-Zehnder optical waveguides (MZ-A, MZ-B, MZ-C) of the optical modulator () are controlled. The control is performed to minimize the light receiving power (P) and to maximize the light receiving power (P).