Feedback-generated periodic pulse trains in quantum dot lasers

Evgeny A. Viktorov; David Goulding; Stephen P. Hegarty; Guillaume Huyet; Thomas Erneux; Bryan Kelleher

doi:10.1117/12.2052405

2 May 2014 Feedback-generated periodic pulse trains in quantum dot lasers

Evgeny A. Viktorov, David Goulding, Stephen P. Hegarty, Guillaume Huyet, Thomas Erneux, Bryan Kelleher

Proceedings Volume 9134, Semiconductor Lasers and Laser Dynamics VI; 91341F (2014) https://doi.org/10.1117/12.2052405
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

Quantum dot lasers have been shown to have greatly enhanced stability in the feedback configuration thanks to a high damping of the relaxation oscillations and they display different dynamics to those of conventional semiconductor lasers. For high feedback levels in conventional devices one obtains Low Frequency Fluctuations: sharp dropouts in intensity and subsequent gradual build-ups. Standard low frequency fluctuation-like traces are conspicuous by their absence in studies of feedback with quantum dot devices. We experimentally examine single mode quantum dot lasers at high feedback levels with a long delay and observe regular pulse-trains with a period equaling the external cavity round-trip time where each pulse features a distinctive broad trailing edge plateau. The distinctive pulse shape is very similar to the recently published strong pulse-asymmetry in two-section, passively mode-locked quantum dot lasers where this asymmetry was shown to result from the creation of different modal groups. We attribute the pulses in our experiment to the same phenomenon: each pulse corresponds to a simultaneous excitation of a number of the external cavity modes. We consider a model tailored specifically for quantum dot lasers with strong optical feedback and find it reproduces the experimentally observed trains extremely well.

Citation Download Citation

Evgeny A. Viktorov, David Goulding, Stephen P. Hegarty, Guillaume Huyet, Thomas Erneux, and Bryan Kelleher "Feedback-generated periodic pulse trains in quantum dot lasers", Proc. SPIE 9134, Semiconductor Lasers and Laser Dynamics VI, 91341F (2 May 2014); https://doi.org/10.1117/12.2052405

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