Abstract
Detailed numerical investigations of the transmission performance of
adaptively modulated optical orthogonal frequency division multiplexed
(AMOOFDM) signals are undertaken, for the first time, in optical
amplification- and chromatic dispersion compensation-free SMF IMDD systems
using semiconductor optical amplifiers (SOAs) as intensity modulators. A
theoretical model describing the characteristics of the SOA-based intensity
modulators is developed, based on which optimum SOA operating conditions are
identified. It is shown that the optimized SOA-based intensity modulators
support a 30 Gb/s AMOOFDM signal transmission over a 80 km SMF, which
doubles the transmission performance offered by directly modulated DFB
lasers. The aforementioned performance enhancement is mainly due to a
considerable reduction in the frequency chirp effect, resulting from the
strong SOA gain saturation-induced decrease in SOA effective carrier
lifetime. Relatively low extinction ratio and clipping of the SOA modulated
signals are identified to be the key factors limiting the maximum achievable
AMOOFDM transmission performance. In addition, results also indicate that
both the optimum SOA operating conditions and the AMOOFDM transmission
performance are insusceptible to variations in SOA parameters.
© 2009 IEEE
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