Hi Zakarya,
Indeed great effrts put by aasif to explain the uses of different types of amplifiers… As far as the practical design is concerned i agree with fayiqa naqshbandi that if u compare the results obtained using EDFA amplifier to the results obtained using raman amplifier the results are better with raman amplifier and the reason as rightly mentioned maybe the gain flattering phenomena in raman amplifier..
Thanks & regards
Sahil Singh