CASCADED RAMAN PUMP FOR RAMAN AMPLIFICATION IN OPTICAL SYSTEMS

摘要

A pumping module having a cascaded Raman laser for Raman amplified optical transmission systems. Non-linear parametric phenomena, such as Raman-assisted three-wave mixing, in Raman amplified signals from a cascaded Raman pump are strongly reduced by substantially suppressing from the output spectrum of the Raman pump the emission peaks at wavelengths shorter than that of the desired pumping wave on a specific wavelength lambda_n, and within a given spacing from lambda_n. The pumping non-zero dispersion fibres have zero dispersion between the wavelength range of the transmission signal and the wavelength range of the pump signal.