Multiple Wavelength Propagation in Free Space Optical Wireless Channel

Frees Space Optical (FSO) communication is a kind of communication that uses open medium to transmit laser light and carry data between the transmitter and receiver. This type of communication system is affected by the effect of weather parameters when transmitting laser light source in the air. A number of studies have been conducted to evaluate the effect of the attenuation coefficient on the laser beam at different wavelength. This study focuses the evaluation of the attenuation coefficient of the laser beam at (750, 785, 950 and 1550) nm wavelength at different visibility of 50km and below. At it has shown when transmitting light beam at distances from 500m to 50km the light beams will be attenuated the same. The other study done by this paper was on the influences of weather condition in the receiver optical power, the link margin and the data transfer rate and the result shows that the weather conditions affect them differently.