Abstract
The performance improvement of 10 Gbit/s single-sideband orthogonal frequency division multiplexing
intensity-modulated direct-detection systems achieved by reducing the signal peak-to-average power ratio (PAPR) with a
symbol precoding technique based on the raised-cosine pulse, without and with bandwidth expansion, is evaluated
experimentally. The impact of pre-emphasis (PE), necessary to mitigate the setup frequency limitations, on the PAPR
reduction achieved by symbol precoding is investigated. At the input of the optical modulator, PAPR reductions of
$\sim$
3 dB with PE and without PE are achieved using the
precoding technique without band excess; with precoding with band excess of 25%, PAPR reductions of
$\sim$
4 dB with PE and 4.5 dB without PE are obtained.
Due to precoding, a bit error ratio (BER) improvement of almost two orders of magnitude is shown along 150 km
standard single mode fiber transmission, for BERs around 10
$^{-4}$
. In addition, it is also shown that precoding enables similar BER improvement with 75 km fiber propagation when
nonlinear fiber effects are moderate.
© 2014 IEEE
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