International Journal of Innovative Research in Science, Engineering and Technology (IJIRSET)
FSO uses modulated optical focused beams to establish atmospheric data transmission. This re-emerging technology combines high data rates around 2.5Gbps in commercial implementations. This characteristic, along with high network reconfigurability (provided by the short deployment time), license-free operation and low sensitivity to electromagnetic interference and jamming, makes FSO systems even more interesting for defense applications. On-Off Keying (OOK) modulation, used by most FSO systems, is not adequate to logically hide the information, if the beam is intercepted. This scenario should be considered, in the case of long-haul military mobile system with large divergence angles.