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Proceedings Paper

Feedback-generated periodic pulse trains in quantum dot lasers
Author(s): Evgeny A. Viktorov; David Goulding; Stephen P. Hegarty; Guillaume Huyet; Thomas Erneux; Bryan Kelleher
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Paper 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.

Paper Details

Date Published: 2 May 2014
PDF: 5 pages
Proc. SPIE 9134, Semiconductor Lasers and Laser Dynamics VI, 91341F (2 May 2014); doi: 10.1117/12.2052405
Show Author Affiliations
Evgeny A. Viktorov, Univ. Libre de Bruxelles (Belgium)
National Research Univ. of Information Technologies, Mechanics and Optics (Russian Federation)
David Goulding, Cork Institute of Technology (Ireland)
Tyndall National Institute (Ireland)
Stephen P. Hegarty, Tyndall National Institute (Ireland)
Guillaume Huyet, Tyndall National Institute (Ireland)
Cork Institute of Technology (Ireland)
Thomas Erneux, Univ. Libre de Bruxelles (Belgium)
Bryan Kelleher, Cork Institute of Technology (Ireland)
Tyndall National Institute (Ireland)

Published in SPIE Proceedings Vol. 9134:
Semiconductor Lasers and Laser Dynamics VI
Krassimir Panajotov; Marc Sciamanna; Angel Valle; Rainer Michalzik, Editor(s)

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