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Gain Performance and Gain Modulation of 980nm-Pumped Erbium-Doped Fibre Amplifiers
Wei Qiu, Yundong Zhang, Jianbo Ye, He Tian and Ping Yuan

The erbium-doped fibre amplifiers pumped by a laser at 980 nm can be simplified into a two – level system. Neglecting amplifier spontaneous emission, we obtained the population of the ground state in a steady-state by a Newton-Raphson iteration from the EDFA rate equation. Consequently, we obtained the analytical expression of the output power and carried out the theoretical and experimental investigation for the gain performance of the EDFA. By introducing a variation of the cosine as modulation of the or pump or signal power, we derived expressions for the amplitude and phase modulation of the population of the ground state. We obtained the numerical analytical model of the gain modulation and discussed simulation results.

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