Experimental investigation of anti-phase chaotic-synchronization dynamics of the polarization modes in VCSELs

In this work, experimental study of chaotic synchronization of a semiconductor lasers is presented. An external optical feedback (OF) is used to reach the anti-phase chaotic synchronization among the orthogonal polarization modes of vertical cavity surface emitting laser (VCSEL). The high levels of (OF) achieve good anti-phase synchronization dynamic of the chaotic signal with zero time delay between the polarization dynamic of the VCSEL. For the (OF) levels of 101 μW and 150 μW we have observed good matching signal of the anti-phase dynamics among VCSEL's polarization modes. While low (OF) levels play less important role in this phenomenon. No synchronization among the orthogonal polarization signals obtained for the range of 1 μW to 53μW of (OF). Such property makes VCSELs attractive for applications; such as chaos based secure optical communications and random number generation.