Time-Division Multiplexing of Pump Wavelengths to Achieve Ultra Broadband, Flat, Backward-Pumped Raman Gain

We describe a simple scheme, which we call the "Raman smart pump," to allow for the achievement of flat gain over very broad bands with backward-pumped Raman amplification. The proposed method, based on time-division multiplexing, also removes all interaction among the various pump wavelengths, and allows for dynamic gain control through simple electronic means.