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We characterize the chaotic dynamics of semiconductor lasers subject to either optical or electro-optical feedback. This characterization is relevant for secure optical communications based on chaos encryption. In particular, we compute as function of system parameters the following quantifiers: Lyapunov spectrum (which measures the rate at which the distance between infinitesimally close solutions increases in time), the Kaplan-Yorke dimension (conjectured to be equal to the information dimension which measures the amount of information needed to locate the system in phase space with infinitesimal accuracy) and the Kolmogorov-Sinai entropy (which measures the average loss of information rate, or equivalently is inversely proportional to the time interval over which the future evolution can be predicted).
Quantum Electronics Conference, 2003. EQEC '03. European
Date of Conference: 22-27 June 2003