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Random polarization switching in gain-switched VCSELs for quantum random number generation

Abstract: In this paper, we report an experimental and theoretical study of the random excitation of the linearly polarized modes of a gain-switched VCSEL characterized by having polarization switching under continuous wave operation. We show that equal probability of excitation of both linearly polarized modes can be achieved by adjusting the modulation conditions and the sampling time. Our VCSEL is such that the bistable region associated to the polarization switching is very narrow, indicating that the random process of excitation of the polarizations works independently of the existence of those bistable regions. A characterization of the random polarization switching is performed by analyzing the dependence of the probability of excitation, autocorrelation, and histograms of both polarized signals on the modulation conditions and sampling times. We finally present preliminar results on random number generation using the analyzed system.

 Autoría: Quirce A., Valle A.,

 Fuente: Optics Express, 2022, 30(7), 10513-10527

 Editorial: Optica Publishing Group

 Año de publicación: 2022

 Nº de páginas: 15

 Tipo de publicación: Artículo de Revista

 DOI: 10.1364/OE.446838

 ISSN: 1094-4087

 Proyecto español: RTI2018-094118-B-C22

 Url de la publicación: https://doi.org/10.1364/oe.446838