THz and IR Signaling through Fog Scintillations

We report Terahertz (THz) and Infrared (IR) freespace signaling through fog and analyze impairments in both links caused by local refraction index changes in the propagation paths. Both channels carry a payload of 2.5 Gb/s which is modulated on carriers at 625 GHz (THz signal) and 193 THz (IR signal). To study the impact of weather conditions on the link performance the beams are superposed and pass through the same fog cloud before they are simultaneously recorded and analyzed. Fog scintillations degrade the IR channel but do not measurably impact the THz signal. BER and power measurements describe the performance of the signals. THz communications; free space IR link; scintillation; fog; weather; propagation loss.