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:
Mar. 30, 2010
Filed:
Nov. 07, 2007
Junichiro Ichikawa, Chiyoda-ku, JP;
Kaoru Higuma, Chiyoda-ku, JP;
Futoshi Yamamoto, Chiyoda-ku, JP;
Satoshi Oikawa, Chiyoda-ku, JP;
Shingo Mori, Chiyoda-ku, JP;
Sunao Kurimura, Tsukuba, JP;
Kenji Kitamura, Tsukuba, JP;
Tetsuya Kawanishi, Koganei, JP;
Masahiro Tsuchiya, Koganei, JP;
Masayuki Izutsu, Koganei, JP;
Junichiro Ichikawa, Chiyoda-ku, JP;
Kaoru Higuma, Chiyoda-ku, JP;
Futoshi Yamamoto, Chiyoda-ku, JP;
Satoshi Oikawa, Chiyoda-ku, JP;
Shingo Mori, Chiyoda-ku, JP;
Sunao Kurimura, Tsukuba, JP;
Kenji Kitamura, Tsukuba, JP;
Tetsuya Kawanishi, Koganei, JP;
Masahiro Tsuchiya, Koganei, JP;
Masayuki Izutsu, Koganei, JP;
Sumitomo Osaka Cement Co., Ltd., Chiyoda-ku, JP;
National Institute for Materials Science, Tsukuba-shi, JP;
National Institute of Information and Communications Technology, Koganei, JP;
Abstract
A nested modulator is provided where the circuit arrangement of modifying electrodes including signal electrodes is simplified, and at the same time, the drive voltage can be lowered. A nested modulator, including: a substratemade of a material having electro-optic effects; an optical waveguide formed on the substrate; and a modulating electrode for modulating light waves which are guided through the optical waveguide, wherein the optical waveguide has a main Mach-Zehnder waveguideand sub-Mach-Zehnder waveguidesandprovided on two branching waveguides of the main Mach-Zehnder waveguide, and the modulating electrode is provided in a sub-branching waveguide of the sub-Mach-Zehnder waveguides, is characterized in that a polarization reversal regionoris formed in a portion of a sub-branching waveguide of each of the sub-Mach-Zehnder waveguides, the modulating electrode is formed of signal electrodes including introduced signal electrodesor, branching single electrodesorand lead signal electrodesoras well as ground electrodes for each of sub-Mach-Zehnder waveguides, and the branching signal electrodes which branch from the introduced signal electrode are placed so as to work on two sub-branching waveguides for each of the sub-Mach-Zehnder waveguides.