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Article Dans Une Revue Optics Letters Année : 2020

Spatiotemporal complexity of chaos in a phase-conjugate feedback laser system

Tushar Malica
  • Fonction : Auteur
Guillaume Bouchez
Marc Sciamanna

Résumé

An 852 nm semiconductor laser is experimentally subjected to phase-conjugate time-delayed feedback achieved through four-wave mixing in a photorefractive (BaTiO3) crystal. Permutation entropy (PE) is used to uncover distinctive temporal signatures corresponding to the sub-harmonics of the round-trip time and the relaxation oscillations. Complex spatiotemporal outputs with high PE mostly upwards of ∼0.85 and chaos bandwidth (BW) up to ∼31GHz are observed over feedback strengths up to 7%. The low-feedback region counterintuitively exhibits spatiotemporal reorganization, and the variation in the chaos BW is restricted within a small range of 1.66 GHz, marking the transition between the dynamics driven by the relaxation oscillations and the external cavity round-trip time. The immunity of the chaos BW and the complexity against such spatiotemporal reorganization show promise as an excellent candidate for secure communication applications.
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Dates et versions

hal-02471278 , version 1 (07-02-2020)

Identifiants

Citer

Tushar Malica, Guillaume Bouchez, Delphine Wolfersberger, Marc Sciamanna. Spatiotemporal complexity of chaos in a phase-conjugate feedback laser system. Optics Letters, 2020, 45 (4), pp.819. ⟨10.1364/OL.383557⟩. ⟨hal-02471278⟩
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