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Low-frequency fluctuations in vertical-cavity surface-emitting lasers with polarization selective feedback: experiment and theory

Soriano, M.C.; Yousefi, M.; Danckaert, J.; Barland, S.; Romanelli, M.; Giacomelli, G.; Marin, F.;
IEEE Journal of Selected Topics in Quantum Electronics 10, 998-1005 (2004)

We present theory and measurements on a vertical-cavity surface-emitting laser (VCSEL) biased close to its solitary threshold and subject to polarization selective external optical feedback. The system shows low-frequency fluctuations (LFF) in the selected polarization mode (PM). Below solitary laser threshold, the orthogonal PM remains silent, while it only responds after a dropout event in the main mode above threshold. Our calculations show good agreement with the measurements and identify a type of synchronization between the low-frequency dynamics of the two PMs.