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:
May. 18, 2004
Filed:
Jul. 13, 2001
Shinya Inagaki, Kawasaki, JP;
Norifumi Shukunami, Sapporo, JP;
Manabu Watanabe, Sapporo, JP;
Hisashi Takamatsu, Kawasaki, JP;
Keiko Sasaki, Kawasaki, JP;
Tomoaki Takeyama, Kawasaki, JP;
Yasushi Sugaya, Kawasaki, JP;
Kaoru Moriya, Kawasaki, JP;
Takashi Satou, Sapporo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A signal light passes through an isolator, and is coupled by a coupler with a pump light from a pump light source. Then, the signal light passes through an ASE reflection filter, is amplified by an EDF, and is transmitted from an isolator. At this time, an ASE light having a predetermined wavelength among ASE lights that occur within the EDF and proceed to the ASE reflection filter is reflected and again input to the EDF. By setting the predetermined wavelength to a wavelength on the short wavelength side of an amplification band of the EDF, gain deviation occurring on the long wavelength side of the amplification band can be cancelled.