Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2005-02-22
2005-02-22
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C359S341410, C359S337400
Reexamination Certificate
active
06859306
ABSTRACT:
A method, apparatus and system for reducing gain ripple in a Raman-amplified WDM system includes determining a gain profile of an optical signal transported via a first Raman amplification span in a Raman-amplified WDM system, comparing the determined gain profile to a gain profile of an optical signal transported via a second Raman amplification span, determining, from the comparison, an amount of wavelength adjustment required for a plurality of Raman pumps comprising at least one Raman pump block of the second Raman amplification span to alter the gain profile of an optical signal transported via the second Raman amplification span, such that a cumulative gain profile of an optical signal transported via the first and the second Raman amplification spans approaches a desired gain profile, and generating a control signal suitable for adjusting the wavelengths of the plurality of Raman pumps of the at least one Raman pump block an amount consistent with the determined amount.
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Fishman Daniel A.
Hunsche Stefan
Liu Xiang
Movassaghi Mahan
Xu Chunhui
Hellner Mark
Hughes Deandra M.
Lucent Technologies - Inc.
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