Abstract
A multiobjective optimization on the parameters of direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) systems in short-range links is proposed. Based on genetic algorithms, the optimization process takes into account the influence of optical power in the guard-band reduction of such multicarrier systems with 4- and 16-quadratic-amplitude modulation (QAM) subcarrier mapping and for propagation in
$40$
km of standard single-mode fiber (SSMF). Simulation results show that the parameters optimization is responsible for a gain of approximately
$2.5$
dB [
$\approx 1.8$
dB] in the required optical power for bit-error-rate
${\le }10^{-3}$
, for DDO-OFDM system transmission over
$40$
km of uncompensated SSMF, with a guard band
$B_G$
equals to
$50\%$
of the signal bandwidth
$B_w$
and 16-QAM [4-QAM] subcarrier mapping. For an extremely reduced guard band of only
$1\%$
of
$B_w$
, the gain reduced to
$\approx 0.5$
dB and
$\approx 1.5$
dB for 16- and 4-QAM mapping, respectively. The optimization process is experimentally validated under the transmission of the optimized DDO-OFDM systems in optical back-to-back (B2B) configuration and
$40$
km of uncompensated SSMF. A fair performance comparison is discussed in the experimental results considering
$B_G/B_w=0.5$
and
$B_G/B_w=0.01$
in the range of the optimized optical powers. It is shown that a maximum optical power penalty of approximately
$2$
dBm is registered according to a guard-band reduction from
$50\%$
to
$1\%$
of the useful bandwidth, for transmission over the 40 km of SSMF, considering 16-QAM subcarrier mapping.
© 2015 IEEE
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