Abstract
We present a thorough numerical study of intensity noise mitigation of
spectrum sliced wavelength-division multiplexing (SS-WDM) systems employing
a nonlinear semiconductor optical amplifier (SOA) before the modulator. Our
simulator of the SS-WDM link, embedded inside a Multicanonical Monte Carlo
(MMC) platform, estimates the tails of the probability density functions of
the received signals down to probabilities smaller than $10^{-16}$. We introduce a new, simple, and efficient technique to handle
intersymbol interference (ISI) in MMC simulations. We address the impact of
optical postfiltering on SOA noise suppression performance. While previous
research experimentally observed the SOA-induced noise cleaning in SS-WDM
systems, this is the first complete simulator able to correctly predict the
ensuing BER improvement. We measure the BER at different bit-rates and
validate predicted BERs with and without post filtering.
© 2009 IEEE
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