Wideband chaos from a laser diode with phase-conjugate feedback

We analyze experimentally and theoretically the chaotic dynamics generated by a laser diode subjected to phase-conjugate feedback. Phase conjugation is obtained from four-wave mixing in a BaTiO photorefractive crystal. We demonstrate that the chaos bandwidth first increases linearly with feedback ra...

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Bibliographic Details
Published inOptics letters Vol. 44; no. 4; p. 975
Main Authors Bouchez, Guillaume, Uy, Chi-Hak, Macias, Brice, Wolfersberger, Delphine, Sciamanna, Marc
Format Journal Article
LanguageEnglish
Published United States 15.02.2019
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Summary:We analyze experimentally and theoretically the chaotic dynamics generated by a laser diode subjected to phase-conjugate feedback. Phase conjugation is obtained from four-wave mixing in a BaTiO photorefractive crystal. We demonstrate that the chaos bandwidth first increases linearly with feedback ratio but then saturates to relatively high values. With a single optical feedback, a chaos bandwidth up to about 18 GHz is achieved, which is about five times as large as the free-running laser diode relaxation oscillation frequency. Numerical simulations confirm our experimental observations and unveil that the finite depth penetration into the crystal is responsible for the observed saturation.
ISSN:1539-4794
DOI:10.1364/OL.44.000975