Wavelength and Temperature Dependence of the Er+3 Concentration in the Erbium Doped Fiber Amplifier

A core graded-index and erbium-doped concentration are studied and optimized for an Erbium-dopedFiber Amplifier (EDFA ) in a two-level model. Also the dependence of both core graded-index and erbiumdopedconcentration on temperature and wavelength of the signal guided are studied. There is evidence to showthat the core graded-index has obvious influence on the gain bandwidth of the EDFA and the erbiumconcentration has effect on the bandwidth of the amplifier also both core graded-index and erbium-dopedconcentration are approximate linear dependence on wavelength and temperature.