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Physical Sciences and Mathematics
The gain and phase dynamics of InAs∕GaAs quantum dot amplifiers are studied using single and two-color heterodyne pump probe spectroscopy. The relaxation of the wetting layer carrier density is shown to have a strong effect on the phase dynamics of both ground and excited state transients, while having a much weaker effect on the gain dynamics. In addition, the dynamical alpha factor may also display a constant value after an initial transient. Such behavior is strongly encouraging for reduced pattern effect operation in high speed optical networks.
O‘Driscoll, I. et al., 2007. Phase dynamics of InAs∕GaAs quantum dot semiconductor optical amplifiers. Applied Physics Letters, 91(26), p.263506. Available at: http://dx.doi.org/10.1063/1.2823589.