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:
Dec. 11, 2007
Filed:
Mar. 03, 2004
Ekaterina Bourova, Boulogne-Billancourt, FR;
Christian Simonneau, Antony, FR;
Catherine Martinelli, Palaiseau, FR;
Lionel Provost, Marcoussis, FR;
Ekaterina Bourova, Boulogne-Billancourt, FR;
Christian Simonneau, Antony, FR;
Catherine Martinelli, Palaiseau, FR;
Lionel Provost, Marcoussis, FR;
Alcatel, Paris, FR;
Abstract
The amplifying optical fiber () comprises a single-mode core () and a multimode core () surrounding the single-mode core, the multimode core containing a doped layer referred to as a 'doped ring' () and having a certain concentration of active rare earth ions () to perform amplification by active rare earth ions on at least one optical signal for injection into the amplifying fiber. The fiber is dimensioned so that the product of its length multiplied by its Raman efficiency is greater than or equal to 0.5 W. In addition, the fiber presents absorption defined by an absorption coefficient expressed in dB/m, which absorption presents, at a certain wavelength, a maximum value referred to as the 'absorption maximum', the fiber presents accumulated absorption, corresponding to the product of its length multiplied by the absorption maximum, that is greater than or equal to 100 dB. The invention also provides an amplifier including such a fiber, a single-mode pump, and a multimode pump.