Performance enhancement of FSO system under the effect of Scintillation using CWDM.

With the ever-growing demand of high bandwidth, secure data transmission and high-speed, Free Space Optics (FSO) has emerged as a suitable solution to meet these demands. However, there are various factors responsible for FSO link degradation. These are bad weather conditions as rain, haze, scintillation, scattering, absorption, background noise, pointing errors, smoke, dust etc.These environmental conditions hinder the signal characteristics resulting in optical loss, phase fluctuation and multipath fading of the received optical power. Atmospheric turbulence induced Scintillation greatly affects the FSO system performance. Hence, there is a need to analyse the effect of scintillation and ASE noise in FSO system. This is the major issue considered in this work. This paper presents Coarse Wavelength Division (CWDM) based FSO system to mitigate the effect of scintillation and to enhance the system performance. In this work, five CWDM channels each with spacing of 20 nm having capacity of 2.5 Gbps are transmitted. The CWDM-FSO system is employed in this paper with semiconductor optical amplifier (SOA) to study the impact of amplitude spontaneous emission noise ASE) at various levels of turbulence. In addition, the performance of proposed CWDM-FSO system is evaluated by varying strength of scintillation and link distance. The results are reported in terms of Eye-Diagrams and BER. [ABSTRACT FROM AUTHOR]