Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2006-05-02
2006-05-02
Hughes, Deandra M. (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C065S390000
Reexamination Certificate
active
07038845
ABSTRACT:
An optical amplifier including: an erbium-doped amplifier medium, a first excitation generator and a second excitation generator. The first excitation generator is adopted to cause a first type excitation of the at least one kind of rare-earth ions to cause a population inversion between the laser upper level and the laser lower level. The second excitation generator is adopted to cause a second type excitation of the at least one kind of rare-earth ions from the excited state absorption lower level to a high excited level which is equal to or higher than the laser upper level.
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Hughes Deandra M.
NEC Corporation
Young & Thompson
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