T. Denga, b, H. T. Chenc, X. D. Lina, b, Y. Y. Xieb, J. G. Wua, b,
G. Q. Xiab, *, Z. M. Wub, and J. G. Chena
a School of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
b School of Physics, Southwest University, Chongqing 400715, China
c Fundament Department, Armed Police Academy, Langfang 065000, China
*e-mail: gqxia@swu.edu.cn
Received April 21, 2012; in final form, May 30, 2012; published online October 1, 2012
Abstract—In this paper, a bidirectional chaos secret communication system, based on mutually coupled semi-
conductor lasers (MCSLs) with asymmetrical bias currents, is proposed, and the synchronization characteristics
and the communication performances of such a system are numerically investigated. The results show that the
stable leader-laggard chaos synchronization can be achieved under relatively large asymmetrical bias current
levels. Meantime, the influence of the intrinsic parameter variations of the laser on the synchronization quality
is also considered, and the simulation reveals that this system still possesses good robustness to the parameter
variations. Moreover, the influences of delay time and mutually coupling strength between the two lasers on
chaos communication performance have also been discussed. Finally, unidirectional and bidirectional secret
communication performances of such a system are examined under the chaos masking (CMS) encryption
scheme, and the security of this system is also discussed.
DOI: 10.1134/S1054660X12110023
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