Abstract
In this paper, we propose, analyze, and experimentally verify
polarization-multiplexed optical wireless transmission with coherent
detection as a means of improving performance and increasing the
per-wavelength data rate in the presence of atmospheric turbulence. It is
first shown that in terrestrial last-mile applications, the polarization
state changes of the optical wireless signal are governed by optical source
properties both in the absence and in the presence of mild to moderately
severe turbulence. Under these conditions, it is shown that the polarization
evolution is reduced to a polarization state rotation wherein the
cross-polarization interference can be equalized with well-known blind
algorithms. We also experimentally verify the analytical findings,
demonstrating 112 Gb/s POLMUX-QPSK transmission with coherent detection in a
non-fading free-space channel, and numerically extend the experimental
results to turbulent settings by invoking the lognormal model for
turbulence-induced fading. Performance gains of 5–14 dB along with
a doubling of the data rate through polarization multiplexing are exhibited
compared to legacy single-polarization intensity modulation/direct detection
(IM/DD) optical wireless systems. The presented analytical and experimental
results indicate that the proposed approach is promising for notably
increasing the data rate in last-mile free-space optical
transmission.
© 2010 IEEE
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