Abstract
A fiber-bundle approach for beam steering at the transmitter was recently
proposed and investigated that allowed tracking of the receiver without the
use of mechanical devices for mobile free-spaced optical (FSO) platforms experiencing
misalignment due to movement and atmospheric turbulence. This paper investigates
different transmitter configurations along with a general pointing, acquisition
and tracking (PAT) algorithm on key parameters including power availability
at the receiver, switching time, link recapturing time, and coverage area
at the receiver plane. The alignment control algorithm with different ways
to track receiver is also evaluated on these key parameters. The algorithm
performance versus transmitted power, switching time and the threshold power
for beam steering was examined. The investigation finds that a combination
of switching combined with splitting of the light between fibers is a suitable
solution to provide the best trade-off between link up time and the coverage
area at the receiver, and thus is a good general purpose design choice, and
the optical tracking system with target location information demands fewer
efforts to recover and maintain the dynamic link than the one without the
awareness of the receiver location information.
© 2012 IEEE
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