We investigate the impact of short optical feedback on a two-state quantum dot laser. A region in the feedback parameter space is identified, where the laser emission periodically alternates between oscillation bursts from the quantum dot ground and excited state, i.e. two-color anti-phase oscillation bursts. We compare these results to the low-frequency fluctuations and regular pulse packages of single-color semiconductor lasers and show via an in-depth bifurcation analysis, that the two-color oscillation bursts originate from a torus-bifurcation of a two-state periodic orbit. A cascade of further period-doubling bifurcations produces chaotic dynamics of the burst envelope. Our findings showcase the rich dynamics and complexity, which can be generated via the interaction of electronic and photonic time scales in quantum dot lasers with optical feedback.

中文翻译：

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光反馈在二态量子点激光器中引起振荡猝发。

我们研究了短光反馈对二态量子点激光器的影响。识别出反馈参数空间中的区域，在该区域中，激光发射在量子点基态的振荡脉冲和激发态之间周期性地交替变化，即双色反相振荡脉冲。我们将这些结果与单色半导体激光器的低频波动和规则脉冲包进行比较，并通过深入的分叉分析表明，双色振荡脉冲源自两个状态周期轨道的圆环分叉。 。级联的进一步倍增的分叉产生了突发包络的混沌动力学。我们的发现展示了丰富的动力和复杂性，