Chaos synchronization in vertical-cavity surface-emitting laser based on rotated polarization-preserved optical feedback.

In this paper, the influence of the rotating polarization-preserved optical feedback on the chaos synchronization of a vertical-cavity surface-emitting laser (VCSEL) is investigated experimentally. Two VCSELs' polarization modes (XP) and (YP) are gradually rotated and re-injected back into the VCSEL. The anti-phase dynamics synchronization of the two polarization modes is evaluated using the cross-correlation function. For a fixed optical feedback, a clear relationship is found between the cross-correlation coefficient and the polarization angle θ_p. It is shown that high-quality anti-phase polarization-resolved chaos synchronization is achieved at higher values of θ_p. The maximum value of the cross-correlation coefficient achieved is -0.99 with a zero time delay over a wide range of θ_p beyond 65° with a poor synchronization dynamic at θ_p less than 65°. Furthermore, it is observed that the antiphase irregular oscillation of the XP and YP modes changes with θ_p. VCSEL under the rotating polarization optical feedback can be a good candidate as a chaotic synchronization source for a secure communication system. [ABSTRACT FROM AUTHOR]