Abstract
We present and analyze a novel fade mitigation technique that is applicable on outdoor
optical wireless systems. Our key idea is to utilize the nonlinear power-dependent gain properties
of a semiconductor optical amplifier (SOA) to provide unbalanced amplification between faded and
non-faded instances of the optical wireless signal. We analytically demonstrate that this power
equalization process smoothes out fade-induced power fluctuations and drastically reduces the
probability of the system being in a fade state. In medium to strong turbulence governed by
gamma-gamma statistics, our results predict that the fade probability can be reduced by over 80%
when the SOA is introduced at the optical wireless receiver. We also show that the duration of
remaining fades is reduced by a sizeable percentage, and a percentile reduction of the average
fade duration of over 85% can be achieved at the SOA output.
© 2013 IEEE
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