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:
Nov. 12, 2013
Filed:
Jan. 14, 2008
Masato Nishihara, Kawasaki, JP;
Tomoo Takahara, Kawasaki, JP;
Yuichi Akiyama, Kawasaki, JP;
Masahiro Yuki, Kawasaki, JP;
Masato Nishihara, Kawasaki, JP;
Tomoo Takahara, Kawasaki, JP;
Yuichi Akiyama, Kawasaki, JP;
Masahiro Yuki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The disclosed device and method include varying phases of two data signals at a first predetermined frequency, performing multi-level phase modulation of a light based on the two data signals whose phases are varied at the first predetermined frequency, extracting a component having the first predetermined frequency from an optical signal subjected to the phase modulation, and controlling the phases of the two data signals based on the component extracted from the optical signal.