2015•VUBIR (Vrije Universiteit Brussel)Requires access
Relation between fast phase response and chaos bandwidth enhancement in semiconductor lasers subject to optical feedback and injection
Romain Modeste Nguimdo, Mulham Khoder, Jan Danckaert, Guy Van der Sande, Guy Verschaffelt
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Abstract
Broadband chaotic signals are useful for applications such as chaos encryption and random bit generation [1]. Typical systems which can generate chaos with relative broad bandwidths are lasers subject to optical delayed feedback or/and optical injection. However, the chaos bandwidth in delayed feedback systems largely limited by the relaxation oscillation (RO) frequency in a typical laser. To circumvent this limitation, optical injection is commonly employed to significantly enhance the chaos bandwidths of lasers without modifying their design [2,3]. Here, we show the quantitative relation between the chaos bandwidth enhancement and the fast phase dynamics in semiconductor lasers with optical feedback and optical injectionbased on numerical simulations of the laser’s response.