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. 29, 2003
Filed:
Sep. 21, 1999
Fabrizio Di Pasquale, Milan, IT;
Fausto Meli, Piacenza, IT;
Giovanni Sacchi, Milan, IT;
Silvia Turolla, Seriate, IT;
Corning O.T.I.SpA, Milan, IT;
Abstract
An optical amplifying unit ( ) for amplifying optical signals in an optical transmission system has an amplification wavelength band with a lower wavelength limit greater than 1570 nm and includes an input ( ) for the input of optical signals, an output ( ) for the output of optical signals and an optical amplifier ( ) interposed between the input ( ) and the output ( ) to amplify the optical signals. The optical amplifier ( ) includes an amplification fiber ( ) co-doped with erbium and ytterbium, at least a pump source ( ) to generate pump radiation and at least an optical coupler ( ) optically coupling the pump sources ( ) to the amplification fiber ( ). The optical amplifying unit has a power gain of at least 31 dB when the optical signals have an input power of at least −10.5 dBm and wavelengths within the amplification wavelength band.