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First Mile Access Networks and Enabling Technologies by Tony Antony, Ashwin Gumaste

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Factors Affecting FSO Operations

When light is transmitted through the atmosphere the strength of the light (power) is attenuated due to scattering and absorption. Attenuation due to absorption and scattering affects light as it travels through the atmosphere. This is given through the following equation:

In this equation Io is the detected intensity at distance d, Ii is the initially launched intensity, and γ is the attenuation coefficient. The attenuation coefficient, a function of the wavelength, is composed of molecular and scattering coefficients and molecular and aerosol absorption coefficients. Here the aerosol absorption coefficient means ...

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