Abstract
We propose and numerically demonstrate a secure optical communication scheme in a small-world semiconductor lasers network based on cluster chaos synchronization and false-message scrambling. According to the symmetries of network, the semiconductor lasers are divided into sets of heterogeneous coupled clusters. The properties of cluster chaos synchronization, the performance and security of optical chaotic communication, as well as the influence of false message on the synchronization of clusters are systematically investigated. It is demonstrated that, by properly setting the parameters of the lasers network, high-quality chaos synchronization can be achieved between the intra-cluster lasers, whereas incoherent states are observed between inter-cluster lasers. Moreover, by inserting false messages into the inter-cluster couplings, the privacy of chaotic carriers transmitted over the inter-cluster public links can be significantly enhanced, as such secure bidirectional communication among intra-cluster lasers is achievable with a message bit rate of several Gbit/s. Compared with the conventional point-to-point communication systems, the proposed scheme supports multipoint-to-multipoint secure communications.
Highlights
In recent years, optical chaotic communication based on semiconductor lasers that utilizes the noise-like waveform and broadband-spectrum chaotic signal as carriers for message hiding has attracted great attention, for its potential application in physical-layer secure communication [1]–[5]
CLUSTER CHAOS SYNCHRONIZATION Firstly, we investigate the influence of coupling strength on the dynamic behaviors of semiconductor lasers (SLs) in the small world network
Since the dynamic behaviors of SLs in the same cluster are very similar for the symmetric configuration, we only show the results of one representative SL for each cluster here
Summary
Optical chaotic communication based on semiconductor lasers that utilizes the noise-like waveform and broadband-spectrum chaotic signal as carriers for message hiding has attracted great attention, for its potential application in physical-layer secure communication [1]–[5]. Our recent work presented a novel high-speed optical communication scheme utilizing the chaos synchronization of distributed semiconductor lasers as the physical key for spectral phase encryption and decryption [20]. Most of these systems mainly focused on the point-to-point scenario, while the multipoint-to-multipoint chaotic communication scenario that is more compatible with the practical communication networks is lack of investigation. S. Liu et al.: Secure Optical Communication Based on Cluster Chaos Synchronization in Semiconductor Lasers Network composed of three SLs for instance, we demonstrate that the proposed system supports bidirectional transmissions over Gbit/s between intra-cluster SLs. it is indicated that the security of intra-cluster message transmissions can be further significantly enhanced, by embedding false messages into the couplings between inter-cluster SLs to prevent the eavesdroppers from accessing correct chaotic carriers from the inter-cluster public links
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