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. 27, 2010
Filed:
Oct. 29, 2008
Akiyoshi Ide, Kasugai, JP;
Jungo Kondo, Aichi-Pref., JP;
Osamu Mitomi, Nagoya, JP;
Yasunori Iwasaki, Kitanagoya, JP;
Hiroki Kobayashi, Kitanagoya, JP;
Akiyoshi Ide, Kasugai, JP;
Jungo Kondo, Aichi-Pref., JP;
Osamu Mitomi, Nagoya, JP;
Yasunori Iwasaki, Kitanagoya, JP;
Hiroki Kobayashi, Kitanagoya, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
An optical modulator has an optical waveguide substrate having a pair of principal surfaces, a pair of side surfaces an incident face and exit face of light, the substrate being composed of a ferroelectric material; a channel optical waveguide having at least a pair of branch sections, a multiplexing section of the branch sections and an exit section provided on the downstream of the multiplexing section, the waveguide being formed on the principal surface of the optical waveguide substrate; a modulation electrode electrodes for applying a signal voltage for modulating light propagating in the branch sections; and a reflective groove for reflecting leaked light of off-mode emitted from the multiplexing section and emitting the light from a principal surface of the optical waveguide substrate. An operating point of the optical modulator is controlled by changing a DC bias applied on the modulation electrode based on optical output of the leaked light of off-mode.