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:
Oct. 27, 2009
Filed:
Aug. 11, 2004
Atsushi Seki, Miyagi, JP;
Atsushi Seki, Miyagi, JP;
Advantest Corporation, Tokyo, JP;
Abstract
An optical amplifier apparatus capable of dealing with different wavelength bands and capable of outputting an amplified light with reduced noise for any one of the wavelength bands. In a case of amplifying a light of C-band, terminals () of an optical switch () are connected to each other. An incident light is amplified by a first front-end optical fiber amplifier () and a first back-end optical fiber amplifier (). The amplified light passes via the terminals () and through a back-end WDM coupler () and goes out of the optical amplifier apparatus (). In a case of amplifying a light of L-band, terminals () of the optical switch () are connected to each other, while terminals () thereof are connected to each other. An incident light is amplified by the first front-end optical fiber amplifier () and first back-end optical fiber amplifier (), passing via the terminals (), thereafter being further amplified by a second front-end optical fiber amplifier () and a second back-end optical fiber amplifier (). The thus amplified light then passes via the terminals () and through the back-end WDM coupler () and goes out of the optical amplifier apparatus ().