Phys.org May 29, 2019
Chaotic optical secure communications (COSC) are a kind of fast-speed hardware encryption technique at the physical layer. Researchers in China have developed a scheme of long-haul COSC, where the bit rate reaches 1.25 Gbits/s and the transmission distance up to 143 km. The low-cost device is built with off-the-shelf optical components and does not require dispersion compensating fibre (DCF) or forward-error correction. The results show that high-quality chaotic synchronisation can be maintained both in time- and frequency-domain, even after 143 km transmission; the bandwidth of the transmitter is enlarged by the external optical injection, which leads to the realisation of 2.5 Gbits/s-message secure transmission up to 25 km…read more. TECHNICAL ARTICLE
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