FSO enables to provide last mile transmission reach with some advantages such as inherent security and no electrical hazards without laying any fiber or cable. In this paper we have analyzed the performance of free space optics communication system by employing five transmitters (CSNRZ CSRZ DBNRZ MDBNRZ and MDBRZ) for different attenuation values at 10Gbps up to the transmission distance of 1100m. The effect of beam divergence, transmitter losses, receiver losses and receiver aperture diameter is also calculated on the performance of proposed hybrid modulation format based free space optical communication system.