We study unidirectionally coupled multimode semiconductor lasers. The transmitter is subject to a weak-to-moderate optical feedback. Multimode chaotic output exhibits antiphase dynamics and multiple coexisting attractors. As a result of antiphase dynamics, total output power synchronization does not require modal output synchronization. The route to synchronization is found to be via intermittency. We also report on synchronization collapse, even for identical lasers.
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Viktorov et al. (2001) studied this question.
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