Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Reexamination Certificate
2006-05-16
2006-05-16
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
C359S334000
Reexamination Certificate
active
07046431
ABSTRACT:
The present invention relates to a light amplifier capable of obtaining the gain and the noise characteristic required for a direct light amplification repeater in order to keep up with the trend toward higher transmission speeds. The light amplifier includes a Raman excitation section for backwardly Raman-exciting an input side optical fiber, a first discrete light amplifier capable of carrying out a discrete amplification of light from the input side optical fiber and Raman-amplified by exiting light from the Raman excitation section, a dispersion compensating fiber Raman amplifier capable of, while dispersion-compensating the light amplified by the first discrete light amplifier in a dispersion compensating fiber, Raman-amplifying the light propagating in the dispersion compensating fiber, and a second discrete light amplifier capable of carrying out a discrete amplification of the light from the dispersion compensating fiber Raman amplifier.
REFERENCES:
patent: 6583922 (2003-06-01), Srikant et al.
patent: 6697189 (2004-02-01), Courtois et al.
patent: 9-179152 (1997-07-01), None
patent: 2000-98433 (2000-04-01), None
patent: 2003-131274 (2003-04-01), None
Onaka Miki
Sugaya Yasushi
Bingham & McCutchen LLP
Fujitsu Limited
Hellner Mark
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