Experimental demonstration of an 8-Gbit/s free-space secure optical communication link using all-optical chaos modulation
Yiqun Zhang, Mingfeng Xu, Mingbo Pu, Qiang Chen, Mengjie Zhou, Shuangcheng Chen, Kun Qiu, Ning Jiang, Xiangang Luo
Abstract
For the first time, to the best of our knowledge, we experimentally demonstrate a high-speed free-space secure optical communication system based on all-optical chaos modulation. The effect of atmospheric turbulence on optical chaos synchronization is experimentally investigated via a hot air convection atmospheric turbulence simulator. It is shown that, even under moderately strong turbulent conditions, high-quality chaos synchronization could be obtained by increasing the transmission power. Moreover, a secure encryption transmission experiment using a high bias current induced chaotic carrier for 8-Gbit/s on-off-keying data over a ∼10-m free-space optical link is successfully demonstrated, with a bit-error rate below the FEC threshold of 3.8 × 10 −3 . This work favorably shows the feasibility of optical chaotic encryption for the free-space optical transmission system.