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:
Apr. 28, 2009
Filed:
Jul. 11, 2007
Akira Ishii, Kawasaki, JP;
Takehito Tanaka, Kawasaki, JP;
Masaharu Doi, Kawasaki, JP;
Tetsu Hasegawa, Kawasaki, JP;
Akira Ishii, Kawasaki, JP;
Takehito Tanaka, Kawasaki, JP;
Masaharu Doi, Kawasaki, JP;
Tetsu Hasegawa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical device is disclosed which suppresses a bias shift which is a deviation of a phase relationship between output signal light and monitoring light. The optical device includes a substrate having an electro-optic effect, a modulating optical waveguide formed on a surface layer portion of the substrate and forming an interference optical modulator for modulating input light, and an output optical waveguide and a monitoring optical waveguide each formed on the surface layer portion of the substrate and branched from and connected to a downstream side portion of the modulating optical waveguide. The monitoring optical waveguide guides light for monitoring optical modulation operation of the modulating optical waveguide. The monitoring optical waveguide has a reduced width region which has a reduced waveguide width.