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, 2015
Filed:
Mar. 12, 2012
Setsuo Yoshida, Kawasaki, JP;
Susumu Kinoshita, Kawasaki, JP;
George Ishikawa, Kawasaki, JP;
Goji Nakagawa, Kawasaki, JP;
Yutaka Kai, Kawasaki, JP;
Kyosuke Sone, Kawasaki, JP;
Keisuke Harada, Fukuoka, JP;
Setsuo Yoshida, Kawasaki, JP;
Susumu Kinoshita, Kawasaki, JP;
George Ishikawa, Kawasaki, JP;
Goji Nakagawa, Kawasaki, JP;
Yutaka Kai, Kawasaki, JP;
Kyosuke Sone, Kawasaki, JP;
Keisuke Harada, Fukuoka, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical amplification apparatus includes a front-stage semiconductor optical amplifier which amplifies an input light and a rear-stage semiconductor optical amplifier which amplifies an amplified light outputted from the front-stage semiconductor optical amplifier. The front-stage semiconductor optical amplifier exercises auto level control of an output light by exercising variable control of driving current which flows according to applied voltage higher than light emitting threshold voltage of an internal optical amplification element. The rear-stage semiconductor optical amplifier performs gate switching of a transmitted light by exercising switching control of driving current. By doing so, distortion of a waveform is controlled and optical communication quality can be improved.