Adaptive Free Space Optic System Based on Visibility Detector to Overcome Atmospheric Attenuation

Abstract Free space optics (FSO) provides high data rate by allowing transmission of signal through atmosphere. FSO is affected by different weather conditions. The atmospheric attenuation is caused by two main factors; absorption and scattering. Fog, rain, snow and cloud cause the scattering of optical signals transmitted in free space. Fog is the most critical attenuating factor. In this paper, a new idea to overcome the atmospheric attenuation is discussed using adaptive transmitter and receiver design based on the transmitted power equation that depends on the weather conditions. The obtained results show a huge performance enhancement in the signal to noise ratio (SNR) and bit error rate (BER).