Abstract
We investigate novel transmission schemes over multimode fiber with
multiple output detectors, providing more efficient utilization of the available
spatial-temporal degrees of freedom of the system by combining coherent phase
shift keying transmission with direct detection. We evaluate the statistics
of the electrical charge generated by each detector, and its dependence on
factors such as detector type, dimension and offset position. In the frequency-selective
case, we reveal that temporal degrees of freedom resulting from nonoverlapping
time pulses modify the decision variable statistics. We apply the ensuing
model to propose a novel phase-modulated single input multiple output (SIMO)
multimode fiber transmission system employing multiple detectors and multiple
input multiple output (MIMO) space-time postdetection signal processing in
order to mitigate the ISI stemming from intermodal dispersion.
© 2008 IEEE
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