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:
Jan. 31, 2006
Filed:
Apr. 29, 2005
Shinsuke Tanaka, Kawasaki, JP;
Ken Morito, Kawasaki, JP;
Shinsuke Tanaka, Kawasaki, JP;
Ken Morito, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In order to realize continuous gain control while realizing polarization independent amplifying characteristic, an optical amplifying device is configured to include: a Mach-Zehnder interferometer including an input side coupler, an output side coupler and a pair of arms, that connects the input side coupler to the output side coupler; a first and a second optical amplifier, to amplify signal light, which are disposed on the pair of arms respectively; and a light source for control light to output control light, in which the first and the second optical amplifier are configured to have polarization independent characteristic and the light source for control light is configured to have a predetermined polarization dependent gain difference or a predetermined polarization dependent loss difference.