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.
© 2015 IEEE
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