Thank you Alessandro (Lolz),I was not aware of this thing.I was just looking for the some specification of EDFA,which are default and can be used as it is.Rest there are many values and i have gone through many papers where they can used different core radius numerical aperture for high gain and gain flatness.Optiwave itself used different parameters in their systems too.So now if i will going to study the EDFA through simulation then i can use any of the values since there are no typical values .isn’t it?
Case of RAMAN fiber amplifier is also smiler to this.Once again thank you for the rply