Abstract
Free
space optical communications (FSOC) is a method by which one transmits a
modulated beam of light through the atmosphere for broadband applications.
Fundamental limitations of FSOC arise from the environment through which light
propagates. This work addresses transmitted light beam dispersion (spatial, angular,
and temporal dispersion) in FSOC operating as a ground-to-air link when clouds
exist along the communications channel. Light signals (photons) transmitted
through clouds will interact with the cloud particles. Photon–particle
interaction causes dispersion of light signals, which has significant effects
on signal attenuation and pulse spread. The correlation between spatial and
angular dispersion is investigated as well, which plays an important role on
the receiver design. Moreover, the paper indicates that temporal dispersion
(pulse spread) and energy loss strongly depend on the aperture size of the
receiver, the field-of-view (FOV), and the position of the receiver relative to
the optical axis of the transmitter.
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