Adaptive Optics in FSO Transmission
At long distances FSO transmissions are susceptible to atmospheric-induced attenuation. System designers have tried to overcome this problem in a variety of ways-with only limited success. Adaptive Optics (AO), can restore lightwaves deformed by the atmosphere to near-original condition, tackling the root-causes of scintillation, wander, and beam spreading. Adaptive optics promises to revolutionize FSO communications by meeting new carrier requirements: true speed- and protocol-independent links that operate over longer distances, at higher bandwidths, through any office window, and with greater reliability-in all weather conditions.
Small, random phase changes cause constructive and destructive interference, resulting in a “speckle” pattern of variable light intensity across the receiver aperture called scintillation.