Optical communications without line-of-sight

Le résumé fourni par la source

A novel technique that for the first time enables practical free-space optical communications without line-of-sight over multi-kilometer distances is proposed. The method is based upon detection of light from a transmitted laser beam that is scattered from the atmosphere. This is received using single photon detectors, using spatial, spectral, and temporal approaches for filtering out the strong daytime light background signal. Laboratory tests are reported that indicate the feasibility of the proposed method. Communication across a lab bench using 16-PPM (pulse position modulation) encoding is reported. The modest data rate of 4 kbit/s that was obtained can be increased using optimized hardware choices. Performance outdoors at multi-km ranges is estimated using an experimentally verified model, with data rates of 100 kbit/s over a distance of 10 km estimated to be achievable.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.