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. 04, 2005
Filed:
Apr. 26, 2002
Takashi Tsuda, Kawasaki, JP;
Kazuo Yamane, Kawasaki, JP;
Makoto Murakami, Sapporo, JP;
Tooru Shima, Sapporo, JP;
Tooru Matsumoto, Kawasaki, JP;
Hiroyuki Iwaki, Osaka, JP;
Kazuto Imai, Sapporo, JP;
Takashi Tsuda, Kawasaki, JP;
Kazuo Yamane, Kawasaki, JP;
Makoto Murakami, Sapporo, JP;
Tooru Shima, Sapporo, JP;
Tooru Matsumoto, Kawasaki, JP;
Hiroyuki Iwaki, Osaka, JP;
Kazuto Imai, Sapporo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The invention relates to a method of activating an optical communication system comprising a plurality of optical amplifiers having an optical amplifier, between optical transmission lines in which wavelength-division multiplex optical signals are transmitted. The method comprises steps of: generating a desired slope in a desired wavelength range of a gain wavelength curve of the optical amplifier; adjusting an output of the optical amplifier to a desired output level; performing the above two steps in a plurality of optical repeater stations, the steps being carried out in sequence from the first to the last optical repeater stations; and adjusting a level in each optical signal in the wavelength-division multiplex optical signal so as to have substantially constant optical signal-to-noise ratios in the optical signals to be received. Activating the optical communication system according to this procedure allows proper execution of gain slope compensation, output control, and pre-emphasis control.