Question: consider a 4 m long EDFA that has a core diameter of 5 um , Er 3 + doping concentration of 8 x 1 0

consider a 4m long EDFA that has a core diameter of 5um, Er3+ doping concentration of 8x10^18. cm^-3 and the spontaneous decay time from E2 to E1 is 10ms. The fiber is pumped at 980 nm from a laser diode. The pump power coupled into the EDFA fiber is 30 mW. assuming the confinement factor is 70%

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