Bidirectional dual-channel chaos synchronization and communication based on mutually coupled VCSELs with optical feedback

Based on mutually coupled vertical-cavity surface-emitting lasers (VCSELs) with optical feedback, a bidirectional dual-channel chaos security communication system are proposed and theoretically investigated. The results show that, through selecting suitable system parameters, high-quality isochronal synchronization can be obtained for the x-, y-LP mode as well as the total intensities, respectively; the synchronization performances for each LP mode and the total intensities preserve a certain extent tolerance to intrinsic mismatched parameters except they are sensitive to frequency detuning between the two VCSELs. Based on the chaos synchronization of the x- and y-LP modes, bidirectional dual-channel communication performances have been preliminarily examined under two encryption methods, namely chaos masking (CMS) and additive chaos modulation (ACM).