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Abstract
Free space optical communication (FSO) is the key technology for connecting systems by means of air as a medium. However signal will lose its strength due to atmospheric losses like rain, fog and other external environmental factors. Wavelength division multiplexing (WDM) approaches are used nowadays which improves signal strength at the receiver. For a perfect communication to happen, the attenuation has to be reduced as much as possible. In this paper, Quality factor (Q) and Bit error rate (BER) of the signal are analysed by simulation models. The line encoding techniques Non- Return-Zero (NRZ) and Return- Zero (RZ) methods were evaluated. The maximum achievable distance is 5kms for power of 40dbm.