Abstract
In the regime of strong mode coupling, the modal gains and losses and
the modal group delays of a multimode fiber are known to have well-defined
statistical properties. In mode-division multiplexing, mode-dependent gains
and losses are known to cause fluctuations in the channel capacity, so that
the capacity at finite outage probability can be substantially lower than
the average capacity. Mode-dependent gains and losses, when frequency-dependent,
have a coherence bandwidth that is inversely proportional to the modal group
delay spread. When mode-division-multiplexed signals occupy a bandwidth far
larger than the coherence bandwidth, the mode-dependent gains and losses are
averaged over frequency, causing the outage capacity to approach the average
capacity. The difference between the average and outage capacities is found
to be inversely proportional to the square-root of a diversity order that
is given approximately by the ratio of the signal bandwidth to the coherence
bandwidth.
© 2011 IEEE
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