A comparison between the dynamic response of a QD - SOA under three different pumping schemes (optical, electrical, and electro - optical) is presented in this paper. For this purpos e, we have us ed the state space model of QD - SOA to investigate the ultra - fast gain dynamics of the amplifier. We found that under equal pumping power, the electrical pumping scheme is more efficient than optical and electro - optical ones. Simulation results show that the electrical pumping scheme not only provides a higher optical gain compared to two other schemes, but also reduces the gain recovery time of the QD - SOA. Furthermore, the practical implementation of electrical pumping scheme is much simpler than two other ones .
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