Abstract
InAs/GaAs quantum dot (QD) lasers have demonstrated unique properties including enhanced stability in external-feedback, bidirectional coupling configurations and optical injection. This latter configuration provides a tractable, non-linear system with effects including multistability, chaos and excitability. For the case of optical injection of a Fabry-Pérot device, various dynamical regimes are observed including excitability and bistability and these dynamics always appear near the locking boundary on the side of negative detuning [1]. Such an asymmetry is well understood for multimode devices. Here we consider the optical injection of a single-mode (DFB) quantum dot device. In this device various non-linear dynamical features, including excitable phase-slips, were found for both positive and negative detuning for the first time. This work proposes using a novel interferometric technique to directly measure the phase and amplitude of the injected slave laser in various dynamical regimes including the aforementioned excitable phase-slipping, bistability between phase-locked and limit cycle operation and chaos. This technique has allowed the first complete experimental reconstruction of the phase and gain dynamics of a semiconductor laser under optical injection.
© 2009 IEEE
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