System Design Considerations in Free Space Optical Links over Turbulence Channel

Recently, the demand for a stable internet connection with high bandwidth and speed has increased tremendously. Hence, free-space optical (FSO) is a potential technique to address this field as it provides a high transmission speed of up to 15 Gbps with high bandwidth of wavelengths commonly 785 to 1550nm, are used. The FSO communication system is subject to limitations such as beam dispersion, atmospheric loss, and scintillation. One of the key disadvantages of the FSO system is that its effectiveness is heavily reliant on the conditions of the weather. In this study, we investigate the performance in terms of the signal-to-noise ratio of the FSO system under various channel circumstances and the effects of changing the system's parameters. For instance, as power transmitted, receiver aperture diameter, and laser wavelength, as many researchers use various parameters for their models. To get the best possible FSO communication model in terms of performance, we thus analyze multiple factors and various weather scenarios.