Gain flatness performance of backward-pumped distributed fiber Raman amplifiers with pump wavelengths in different arrangement

摘要

The relationship between the gain flatness performances with the pump wavelength spacing in single-stage backward-pumped distributed fiber Raman amplifiers (B-DFRAs) were demonstrated theoretically. It was shown that the gain spectrum of B-DFRA which pump wavelengths were arranged in a geometric proportion interval sequence were flatter than one which pump wavelengths were arranged in an equal interval sequence in the same conditions.