Two-channel fibre Raman amplification for wavelength division multiplexed systems

The simultaneous amplification of two wavelength-division, multiplexed channels is of interest for long-haul high data capacity links. The use of fibre Raman amplification in this application is discussed, and the trade-off between on/off ratio and gain is evaluated as a function of channel spacing. The analysis is performed in the pump nondepletion region, and the effect of optical bandpass filtering on this trade-off is presented.