Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2008-07-08
2008-07-08
Hughes, Deandra M. (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C385S127000
Reexamination Certificate
active
07397599
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−1. 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.
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Bourova Ekaterina
Martinelli Catherine
Provost Lionel
Simonneau Christian
Alcatel
Diacou Ari M
Hughes Deandra M.
Sughrue & Mion, PLLC
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