Dual wavelengths and three wavelengths forward-pumped Raman fiber amplifiers were realized. Twenty channels in the C band ranging from 1 537.377 to 1 560.605 nm on the ITU-T grid were used as the incident signals of DRA. 100 km and 75 km transmission links were adopted respectively. The gain ripple of three wavelengths pumping configuration is below 1.47 dB and the lowest OSNR is 32.5 dB

which is better than that of backward pumping configuration. The gain saturation was experimentally studied in detail. The experimental result showed that the increment of gain would decrease the saturation power of signals and the gain saturation phenomena would be strengthened by the increased gain. The saturation power of two wavelengths pumped RFA was about 5 dBm.