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Performance improvement of OFDM signals in EAM-based communications through precoding

Cruz, P. E. D. ; Cartaxo, A.

Performance improvement of OFDM signals in EAM-based communications through precoding, Proc Conf. on Telecommunications - ConfTele, Castelo Branco, Portugal, Vol. 1, pp. 61 - 64, May, 2013.

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Orthogonal frequency division multiplexing
(OFDM) signals have been proposed recently to be used in
optical fiber communication systems. The major reason for this
is that linear fiber distortion effects, such as those resulting
from chromatic dispersion, can be easily mitigated. However,
OFDM signals have the disadvantage of high peak-to-average
power ratio (PAPR), which prevents the use of OFDM signals
with high power levels, leading to reduced signal-to-noise ratio
(SNR). As a consequence, it is very relevant to generate OFDM
signals with reduced PAPR so that high SNRs can be achieved.
The main objective of this work is to assess the performance
improvement of OFDM signals at 10 Gbit/s in electro-absorption
modulator-based direct detection optical networks by reducing
the PAPR with a technique named symbol precoding. The results
show an error vector magnitude improvement of about 10 dB
in optical back-to-back with precoding, relative to the situation
without precoding. With optical transmission, the increase in
singlemode fiber reach when employing precoding is higher for
OFDM signals with high root-mean-square voltages.