Abstract
Free space optics (FSO) is a communication system where free space acts as medium between transceivers and they should be in line-of-sight for successful transmission of optical signal. Medium can be air, outer space, or vacuum. This system can be used for communication purpose in hours and in lesser economy. There are many advantages of FSO like high bandwidth and no spectrum license. The transmission in FSO is dependent on the medium because the presence of foreign elements like rain, fog, and haze, physical obstruction, scattering, and atmospheric turbulence are some of these factors. In this work, we demonstrate the development of a 100 Gbps FSO link which employing polarization division multiplexing technique. For improved receiver performance, we have used coherent detection. In order to transport large-speed data without inter-symbol interference, orthogonal frequency division multiplexing has been employed. We have investigated the system performance for different modulation formats and state of climate affairs. The proposed system has been modeled and analyzed over Optisystem test bed. Keywords - free space optics; polarization division multiplexing; coherent detection; orthogonal frequency division multiplexing; modulation formats; weather conditions
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