Mitigation of Scintillation Effects in WDM-FSO System Using Homodyne Detection

Abstract Free Space Optics is a line of sight communication which transmits a very narrow beam width. FSO offers high bandwidth and higher data rate up to 10Gbps. FSO units are transportable, compact and are easy to redeploy. With so many advantages of FSO there exists serious limitations of atmospheric effects which makes it inefficient for long reach transmission. Environment factors act as barriers in efficient utilization of FSO technology. A major issue in FSO links is the turbulence induced fading which severely deteriorates the link performance, hence need to be alleviated for the efficient use of this rapidly emerging technology. Various researches have been carried out in FSO field to minimize the effect of turbulence induced scintillation. One such technique has been employed in this paper in which coherent based homodyne detection is utilized in conjunction with multibeam technique in WDM-FSO system with aim to reduce the scintillation effect. The performance comparison of the homodyne detection and direct detection in terms of bit error rate, Q- factor, and eye diagram has been explored for the scintillating effect.