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:
Dec. 25, 2018
Filed:
Dec. 24, 2015
Sumitomo Osaka Cement Co., Ltd, Tokyo, JP;
Norikazu Miyazaki, Tokyo, JP;
Toshio Kataoka, Tokyo, JP;
Youichi Hosokawa, Tokyo, JP;
Kei Katou, Tokyo, JP;
SUMITOMO OSAKA CEMENT CO., LTD., Chiyoda-Ku, Tokyo, JP;
Abstract
Provided is an optical modulator in which low-voltage drive and a stable modulation characteristic are secured over a wide bandwidth. An optical modulator includes: a substratean optical waveguide (not shown) formed in the substratea modulation electrode (a signal electrodeand a ground electrode) for modulating light waves propagating through the optical waveguide; and an external signal line (not shown, only a connection connectoris shown) which is provided outside the substrate and supplies a modulation signal to the modulation electrode, in which an impedance value of the modulation electrode in an active region S in which an electric field formed by the modulation electrode is applied to the optical waveguide is set to be lower than an impedance value of the external signal line, and an impedance adjustment parthaving an impedance adjustment function with respect to mainly a modulation signal in a low-frequency area and configured of a lumped-constant circuit, and an impedance matching line L having an impedance adjustment function with respect to mainly a modulation signal in a high-frequency area are disposed between the external signal line and the active region of the modulation electrode.