Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2006-07-18
2006-07-18
Keith, Jack (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C359S337400, C359S334000
Reexamination Certificate
active
07079313
ABSTRACT:
An optical amplifying apparatus has a plurality of pumping sources generating pumping light beams at different wavelengths, a Raman amplification medium receiving the pumping light beams from the pumping sources to amplify a main signal light beam by using stimulated Raman scattering phenomenon due to the pumping light beams, a rare-earth-doped optical amplification medium receiving the main signal light beam amplified by the Raman amplification medium to further amplify it, and a pumping light introducing means introducing a part or all of a pumping light beam at a specific wavelength of the pumping light beams as a pumping light beam for the rare-earth-doped optical amplification medium to the rare-earth-doped optical amplification medium. The optical amplifying apparatus in a smaller size and with less fluctuation in the optical output power can readily send monitoring control information irrespective of presence of the optical input power.
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Hecht, Jeff. Understandign fiebr optics 2nd ed. Sams Publishing. 1993 Indianapolis, IN. pp. 209-228.
Ogiwara Hiroshi
Ohta Kenji
Diacou Ari M.
Fujitsu Limited
Keith Jack
Staas & Halsey , LLP
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