Patent ID: 6859306
Filing Date: 2005-02-22
Classification: H04B

Abstract:
1. A method, comprising: determining a gain ripple profile of an optical signal propagated via a first Raman amplification span in a Raman-amplified WDM system; comparing said determined gain ripple profile to a gain profile of a second Raman amplification span; determining, from said comparison, an amount of wavelength adjustment required for a plurality of Raman pumps comprising at least one Raman pump block of said second Raman amplification span to alter the gain profile of said second Raman amplification span, such that a cumulative gain profile of an optical signal transported via said first and said second Raman amplification spans approaches a desired gain profile, wherein said desired gain profile is a gain profile tending to reduce the gain ripple of at least said optical signal in said first Raman amplification span; and generating a control signal suitable for adjusting the wavelengths of said plurality of Raman pumps of said at least one Raman pump block an amount consistent with said determined amount.