Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 36: Focussed Session: Frontiers in Laser Diode Physics I

HL 36.9: Talk

Thursday, March 15, 2018, 12:30–12:45, EW 202

Stability of Two-State Quantum-Dot Lasers with Optical Feedback — Lucas Kluge, •Stefan Meinecke, and Kathy Lüdge — Institut für Theoretische Physik, Technische Universtität Berlin, Berlin, Germany

Semiconductor lasers based upon self-assembled quantum-dots (QDs) are promising sources for applications in optical networks used e.g. for data transmission via optical fibers. Recently, their ability to show simultaneous two-state lasing became the focus of diverse investigations.

We theoretically study a two-state quantum-dot laser with optical self-feedback. Our modeling approach is based on microscopically based rate-equations and goes beyond the constant alpha-factor approximation by including carrier dependent frequency shifts obtained from a full Bloch-equation approach.

In our previous work [1], we demonstrated that two-state lasing, although increasing the dynamical degrees of freedom, stabilizes the response of a QD laser to optical injection. We now report, that in the case of time-delayed feedback, a similar mechanism also increases the dynamical stability of a two-state laser. Regions of complex dynamics, which are predicted for single-color QD lasers, are greatly reduced, if lasing from the excited state is possible.

This behavior makes two-state QD lasers suitable for applications where a high tolerance for unwanted back-reflections is crucial for stable operation.

[1] S. Meinecke, B. Lingnau, A. Röhm, K. Lüdge, Ann. d. Physik (2017)