Optical: systems and elements – Optical amplifier – Particular active medium
Reexamination Certificate
2005-05-10
2005-05-10
Tarcza, Thomas H. (Department: 3663)
Optical: systems and elements
Optical amplifier
Particular active medium
Reexamination Certificate
active
06891664
ABSTRACT:
A multi-stage tunable gain optical amplifier device amplifies an optical signal by a gain amount which can be adjusted in one of the stages of the amplifier. The multi-stage amplifier includes at least two optical amplifier stages coupled in series, one of which is a tunable gain amplifier stage. The optical amplifier stages are characterized by a design parameter which varies from stage to stage. In a preferred embodiment, the design parameter includes a noise figure and a saturable power, with both parameters increasing as the optical signal propagates from stage to stage. As a result, the multi-stage tunable gain optical amplifier can achieve better noise performance and higher output power than a single stage optical amplifier with a constant noise figure and saturable power.
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DiJaili Sol P.
Wachsman John M.
Finisar Corporation
Hughes Deandra M.
Tarcza Thomas H.
Workman Nydegger
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