Abstract
Mode-division multiplexing systems employ multi-input
multi-output (MIMO) equalization to compensate for chromatic dispersion (CD),
modal dispersion (MD) and modal crosstalk. The computational complexity of
MIMO equalization depends on the number of modes and on the group delay (GD)
spread arising from CD and MD. Assuming the strong-coupling regime, in which
the total system length far exceeds the correlation length of modal fields,
we quantify the GD spread arising from MD, showing that it can be reduced
significantly by mode coupling. We evaluate the computational complexity of
various MIMO single-carrier equalizers, considering separate or combined equalization
of CD and MD, in the time or frequency domain. We present numerical examples
for the optimally designed graded-index depressed-cladding fibers supporting D=6, 12, 20 or
30 modes in two polarizations. Assuming a 2000-km system length, a 1-km correlation
length, and a combined CD+MD frequency-domain equalizer, the complexity (in
complex multiplications per two-dimensional symbol) is a factor 1.4, 1.7,
2.2, 2.8 times higher for D=6, 12, 20, 30 than for polarization-multiplexed systems in standard
single-mode fiber (D=2).
© 2012 IEEE
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