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Two unidirectionally coupled external cavity semiconductor lasers showing chaotic intensity fluctuations are studied by numerically solving the Lang-Kobayashi model equations [IEEE J. Quantum Electron. QE-16, 347 (1980)]. The systems are shown to synchronize when operating in the regime of low-frequency fluctuations, which is characterized by a very high-dimensional $(d>150)$ attractor. The influence of parameter differences between the two lasers on the synchronization quality is investigated.
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Ahlers et al. (1998) studied this question.
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