Complex Dynamics Induced by Asymmetry in Coupled Laser Systems

    2019, Vol. 15, no. 4, pp.  429-455

    Author(s): Bountis A., Kominis Y., Shena J., Kovanis V.

    Coupled semiconductor lasers are systems possessing complex dynamics, which makes them interesting for many applications in photonics. In this paper, we first review our results on the existence and stability of asymmetric phase-locked states of a single dimer consisting of two coupled semiconductor lasers. We show that stable phase-locked states of arbitrary asymmetry exist, whose field amplitude ratio and phase difference can be dynamically controlled by appropriate electronic current injection. Moreover, we obtain stable limit cycles with asymmetric characteristics, emerging through Hopf bifurcations from these phase-locked states. Also, we emphasize the importance of exceptional points, and we show that asymmetry enables their existence in extended regions of parameter space. The dynamics of asymmetric dimers under small signal modulation of the pumping current is also investigated and the occurrence of antiresonances and sharp resonances with very high frequencies is demonstrated. Finally, we describe our recent findings on optically coupled arrays of coupled dimers and explore their fascinating nonlinear dynamics. In particular, we couple in an appropriate way a large number of dimers and show that, depending on their degree of asymmetry, they exhibit organized high amplitude oscillations, or oscillate very close to phase-locked states, suggesting that such photonic networks may prove useful in a variety of beam forming and beam shaping applications.
    Keywords: coupled mode equations, semiconductor laser arrays, Hopf bifurcations, limit cycle oscillations, coherence in photonic arrays
    Citation: Bountis A., Kominis Y., Shena J., Kovanis V., Complex Dynamics Induced by Asymmetry in Coupled Laser Systems, Rus. J. Nonlin. Dyn., 2019, Vol. 15, no. 4, pp.  429-455

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