Private Free-Space Transmission Based on Chaos Synchronisation in the $8-14 \upmu\mathrm{m}$ Atmospheric Transparency Window

With the emergence of Internet Of Things (IOT), the fast increment of users and the space development has opened the research towards free-space optics (FSO) using mid-infrared (MIR) wavelengths. Despite promising results have already been achieved in the $1.5\ \upmu\mathrm{m}$ wavelength range, the mid-infrared domain offers several other advantages in particular a strong resistance to various atmospheric impairments [1]. Specifically, the $8-14\ \upmu\mathrm{m}$ range has a high atmospheric transparency, strong resistance to degraded atmospheric conditions including turbulence [2]. For an eavesdropper, intercepting the beam through the atmosphere is more difficult because of significant thermal radiation in this range of wavelength. As MIR technology becomes more and more mature with recently demonstrated data transfers of several tens of Gbps it also becomes urgent to focus on the security and to innovative alternatives to ensure data privacy [3].