We explore experimentally and theoretically the dynamics of a DFB quantum well laser subject to external optical feedback from a mirror. With increasing feedback, the system exhibits the following dynamical scenario: an extremely small limit cycle appears first and is followed by a quasi-periodic regime, and then by three subsequent limit cycles with different repetition rates. This sequence of limit cycles can be associated with the change of phase of the reflected field which reveals translational symmetry and the fact of periodic solutions coexistence which we confirm numerically. The results can be useful for applications in reservoir computing with phase space of coexisting limit cycles acting as a nonlinear reservoir as well as for other applications.
Michael J. Wishon, Anton V. Kovalev, Daeyoung Choi, David S. Citrin, Evgeny A. Viktorov, and Alexandre Locquet, "Coexisting periodic regimes in semiconductor lasers with optical feedback," Proc. SPIE 10912, Physics and Simulation of Optoelectronic Devices XXVII, 109120O (Presented at SPIE OPTO: February 06, 2019; Published: 26 February 2019); https://doi.org/10.1117/12.2510499.
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