Fishman, D.A., S. Hunsche, X. Liu, M. Movassaghi, and C. Xu.
“Method, Apparatus and System for Reducing Gain Ripple in a Raman-Amplified Wdm System” US Patent 6,859,306. (February 22, 2005) >>> Link
Method, Apparatus and System for Reducing Gain Ripple in a Raman-Amplified Wdm System