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:
Jul. 17, 2007
Filed:
Sep. 23, 2005
Takahisa Fujita, Tokyo, JP;
Satoshi Oikawa, Tokyo, JP;
Takahisa Fujita, Tokyo, JP;
Satoshi Oikawa, Tokyo, JP;
Sumitomo Osaka Cement Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a cost-saving and space-saving optical modulator enabling application of modulation signals with high phase difference accuracy without using a separate component for generating a phase difference outside of the optical modulator, when identical modulation signals having a predetermined phase difference are applied into a plurality of modulation electrodes. An optical modulatorincluding a substrate with an electro-optic effect, a plurality of optical waveguide sectionsformed on the substrate, and a plurality of modulation electrodesandfor modulating lights passing through the optical waveguide sections, and into which identical modulation signals having a predetermined phase difference are applied, wherein a branch element for branching a modulation signal into a plurality of modulation signals is formed, and a delay line for generating the phase difference is formed in the middle of lines for applying the modulation signals branched by the branch element into the plurality of modulation electrodes.