The attractive bandwidth boosts Free Space Optics (FSO) communication offers uses unlicensed bands across the global spectrum. However, the link capacity and availability are the central issues in the various atmospheric situations. The request for increase in bandwidth rises in mobile communication with the rise in user’s number. Various technologies are existing in today's access network, such as co-axial cables, broadband radio frequency, wireless internet access and optical fiber. But, existing technologies have disadvantages, including congested spectrum, decreased data rates, costly licensing, security difficulties, and high installation costs. This paper analyzed the effect of attenuation coefficient α (dB/Km) on performance parameters like Q-factor, BER and the eye diagram of FSO channel at different lengths. Furthermore, the influence in the power on the performance parameters of the FSO channel is studied. Lastly, the influence in performance parameters by receiver aperture diameter is investigated. Upon the comprehensive investigation of the results obtained, it is observed that the attenuation coefficient, transmitter power and receiver aperture diameter plays a major role in the whole system efficiency.