Optimized FSO System Performance over Atmospheric Turbulence Channels with Pointing Error and Weather Conditions

Abstract

In this paper, Bit Error rate and probability of outage are derived in closed form for plane wave mode over Gamma-Gamma free space optical channel under the influence of pointing errors and different weather conditions. The free-space optical system under study assumes deployment of intensity modulation / direct detection with on-off keying data formats. To evaluate the performance of the system using the derived expressions, two independent optimization algorithms were applied to find optimum system and channel parameters that optimize the performance of the two system metrics, i.e., bit error rate and probability of outage. The optimized system results were shown for different values of channel strength, weather conditions, optimum beamwidths and pointing error jitter variances. For each case, the optimized results are provided as a function of the transmitted power or average received power.