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PACS number(s): 89.75.Kd, 05.45.Xt, 89.75.Hc, 02.30.KsWe study the synchronization properties of the delay dynamics of two identical semiconductor lasers coupled through a semitransparent mirror. Via an analytical and numerical approach, we investigate the influence of asymmetries, in particular mismatches of self- and cross-coupling strength and differences in self- and cross-coupling delay. We show that the former mismatch affects the stability of the zero-lag state but not the dynamics within the synchronization manifold, while the latter mismatch does not affect the quality of synchronization but alters the dynamics significantly. Our results are extended to different unidirectional coupling schemes. This is highly relevant for communication schemes utilizing chaotic dynamics. Finally, the influence of nonlinear gain saturation on the dynamics and stability of synchronization is discussed.O.D. acknowledges the Research Foundation Flanders\ud(FWO-Vlaanderen) for support. This research was partially\udsupported by MICINN (Spain) under project DeCoDicA\ud(Project No. TEC2009-14101), by DFG (Germany) in the\udframework of SFB 910, by the Interuniversity Attraction\udPoles program of the Belgian Science Policy Ofce, under\udGrant No. IAP VI-10 (photonics@be), and by the project\udPHOCUS. The project PHOCUS, in turn, acknowledges the\udnancial support of the Future and Emerging Technologies\ud(FET) program within the Seventh Framework Programme\udfor Research of the European Commission, under FET-Open\udGrant No. 240763Peer reviewe

Mismatch and synchronization: Influence of asymmetries in systems of two delay-coupled lasers