In this article, the authors study the effects of Single Input Multiple Output (SIMO) diversity technique, aperture averaging schemes, and wavelength diversity method on a Free Space Optical (FSO) communication, in the presence of varying turbulence regime strengths with a variety of meteorological circumstances, including extremely clear visibility, clear visibility, haze, fog, etc. Here, two wavelength types- Mid Wave Infrared (MWIR) (4000 nm) and ShortWave Infrared (SWIR) (1550 nm) have been taken into consideration for the use of the wavelength diversity approach. For the investigation of the overall performance at a 4 km link distance, up to 12 number of detectors on the receiver side have been considered, and for aperture averaging, 0.05 to 0.2 m receiver aperture diameter has been taken into consideration. The system performance has been improved by enlarging the receiver's aperture diameter and receiver array, and applying their impacts for both of the two wavelength FSO links, the performance evaluation has been carried out for the two wavelengths. According to the analytical findings, MWIR wavelength performs better in foggy situations than SWIR wavelength with distinct turbulence regimes at the mentioned link distances, and the SIMO scheme is also significantly more effective in unfavourable weather scenarios (such haze, fog, etc.) compared to aperture averaging scheme.
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