Performance Analysis of Negative Exponential Turbulent FSO Links with Wavelength Diversity

FSO communication systems have received huge attention in recent years due to low cost, huge bandwidth and secure alternative to current technologies. However, the performance is critically impaired by atmospheric turbulence. This paper presents the wavelength diversity as a mitigating technique, based on the fact that refractive index variation is different at different wavelengths. The strong atmospheric conditions are modeled with negative exponential distribution. We derive the closed-form expressions for outage probability and average BER. Numerical results for outage probability and average BER at different diversity orders have been presented to demonstrate our suggestions for improving the system performance.