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:
Mar. 19, 2002
Filed:
May. 19, 2000
Koji Nakazato, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
In an optical amplifier for wavelength-multiplexing transmission of this invention, signals of a plurality of wavelengths in a 1.55-&mgr;m wavelength band, which is input to an input terminal, sequentially passes through an optical isolator and optical coupler, and is input to an amplification optical fiber to be amplified. The signals amplified by and output from the amplification optical fiber sequentially passes through an optical isolator, optical coupler, optical isolator, and optical coupler, and is input to a further amplification optical fiber to be amplified. The signals amplified by and output from the further amplification optical fiber sequentially passes through an optical coupler, optical isolator, and optical coupler and is output from an output terminal. Each of an input-side optical amplifier and output-side optical amplifier performs constant output control.