Optical: systems and elements – Optical amplifier – Particular active medium
Reexamination Certificate
2008-05-20
2008-05-20
Hughes, Deandra M. (Department: 3663)
Optical: systems and elements
Optical amplifier
Particular active medium
C398S175000, C398S180000
Reexamination Certificate
active
07375879
ABSTRACT:
The field of the invention is that of devices for regenerating optical signals. It applies more particularly to systems for high-throughput long distance transmission by optical fibres of digital data. While propagating, optical signals necessarily experience attenuation and degradation of their signal
oise ratio. To compensate for these degradations, wholly-optical regeneration devices are generally used. The object of the invention is to ensure regeneration which in large part eliminates noise, without using auxiliary optical devices. This regeneration is ensured by a structure with saturable optical absorbent comprising an optical cavity of thickness L comprising at least one layer of active material of Henry factor αHand of maximum absorption variation Δα such that the thickness L equals about 2π/(αH, Δα).
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Alcatel
Bolda Eric
Hughes Deandra M.
Lowe Hauptman & Ham & Berner, LLP
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