Abstract
In this paper, the acceleration of phase recovery in quantum-dot semiconductor
optical amplifiers (QD-SOAs) is investigated by employing optical pumping
(OP) scheme. For this purpose, the state space theory has been used to derive
a dynamic model for the QD-SOA. The derived nonlinear state space model is
employed to simulate the gain and phase responses of the device. For the first
time, we show that OP can realize a shorter phase recovery time in comparison
with electrical pumping (EP) scheme under equal pumping powers. We found that
under OP, the contribution of slow phase recovery component induced by the
slow carrier dynamics of the carrier reservoir is drastically reduced, and
consequently, a fast phase response becomes feasible. Also, we found that
under EP, the gain is recovered within a shorter time compared to OP scheme.
© 2012 IEEE
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