Abstract

We report on an experimental investigation of the nonlinear dynamics and the chaos synchronization in mutually coupled but nonidentical 1550-nm vertical-cavity surface-emitting lasers (VCSELs) subject to optical injection with parallel polarizations of the two lasers. We use an asymmetric all-fiber setup with a large total coupling delay time, 274.2 ns. The results are analyzed for different values of the relevant parameters, namely, the frequency detuning, that is, the emitting frequency difference between the two coupled VCSELs, and the coupling strength between the two lasers. We show that dynamics in the orthogonal linear polarization can appear for negative frequency detunings. A rich variety of nonlinear behaviors such as limit cycle, period doubling, and chaos have been observed. Moreover, achronal chaotic synchronization for an asymmetric setup and nonidentical VCSELs is found with a time shift corresponding to the large coupling delay time between the lasers. We analyze the leader–laggard relationship and the accuracy of the synchronization by the cross-correlation function.

© 2015 Optical Society of America

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