Measurement of Raman gain coefficient for small wavelength shifts

Abstract

Traditionally the calculations of inter-channel power transfer due to stimulated Raman scattering in WDM transmission systems use a wavelength dependence that is a linear approximation of measurements obtained using a 1480 nm pump. We measure the wavelength dependence of the Raman effect for shifts that are typical for the WDM transmission band and use this data to analyze gain tilt in long-haul systems.