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:
Jul. 31, 2007
Filed:
Aug. 07, 2003
Toshihiro Ohtani, Hokkaido, JP;
Tsukasa Takahashi, Hokkaido, JP;
Eiji Ishikawa, Hokkaido, JP;
Hiroto Ikeda, Hokkaido, JP;
Hiroyuki Deguchi, Kawasaki, JP;
Toshihiro Ohtani, Hokkaido, JP;
Tsukasa Takahashi, Hokkaido, JP;
Eiji Ishikawa, Hokkaido, JP;
Hiroto Ikeda, Hokkaido, JP;
Hiroyuki Deguchi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A reliable optical transmission system with an improved signal control mechanism that avoids abrupt power variations of light beams, thereby preventing optical supervisory channel (OSC) signals from experiencing errors. An optical amplifier amplifies main signals under the control of an optical amplifier controller, which spends a first predetermined time to raise the output power of the optical amplifier up to a desired level. A pump light source produces a pump beam for injection to a fiber-optic transmission line so as to make it serve as an amplifying medium. The pump light source is controlled by a pump light source controller that spends a second predetermined time to raise the pump beam to a desired power level. This stepwise start-up process of the amplifier power and pump beam power prevents OSC signals from experiencing abrupt power variations.