Free Space Optics (FSO) is useful where a fiber optic cable is impractical. It is similar to fiber optic communications in that data is transmitted by modulated laser light. Instead of containing the pulses of light with in a glass fiber, these are transmitted in a narrow beam through the atmosphere. This article discusses the main architectural details of the FSO communication system.. The major FSO Parameters discussed are wavelength selection, features of different wavelength windows and optical channel model. The article investigates the Performance of Free Space Optical Link under Various Attenuation Effects like rain, fog using Optiwave.
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