Performance analysis of optical wireless link under various atmospheric conditions using Fresnel lens technique

In an optical wireless link the atmospheric effect has a major impact on the performance of optical beam transmission in different weather environment. This investigation based on different weather circumstances such as clear, haze, thin fog, light fog and heavy fog on data rate, received signal and signal to noise ratio at 1550 nm wavelength for a free space optical communication. It is possible to enhance the system performance such as data rate, received power and SIN ratio in different weather condition by Fresnel lens technique. By using this technique, non coherent light source such as LED has been used instead of LASER in free space optical communication. The potential of LEDs to be modulated at high speeds offers the possibility of using LED as sources for communication instead of LASER. Simulation results shows that in all weather conditions, the performance of the system improved by using Fresnel lens technique and heavy fog attenuates more optical signal then other atmospheric condition.