The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 2005
Filed:
Feb. 04, 2003
Daniel A. Fishman, Lakewood, NJ (US);
Stefan Hunsche, Sunnyvale, CA (US);
Xiang Liu, Marlboro, NJ (US);
Mahan Movassaghi, Middletown, NJ (US);
Chunhui Xu, Ithaca, NY (US);
Daniel A. Fishman, Lakewood, NJ (US);
Stefan Hunsche, Sunnyvale, CA (US);
Xiang Liu, Marlboro, NJ (US);
Mahan Movassaghi, Middletown, NJ (US);
Chunhui Xu, Ithaca, NY (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
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.