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Semi-analytical approach for performance evaluation of direct-detection OFDM optical communication systems

Alves , T. M. F. ; Cartaxo, A.

Optics Express Vol. 17, Nº 21, pp. 18714 - 18729, October, 2009.

ISSN (print): 1094-4087
ISSN (online): 1094-4087

Journal Impact Factor: 3,488 (in 2014)

Digital Object Identifier: 10.1364/OE.17.018714

Abstract
A semi-analytical method to evaluate the bit error ratio (BER)
in direct-detection (DD) optical fibre transmission systems employing
orthogonal frequency division multiplexing (OFDM) and optically preamplified
receivers is proposed. The method considers a Gaussian approach
for the signal at the equalizer output and allows evaluating accurately the
BER of each OFDM subcarrier for the receiver structure considered and
for practical optical and electrical filters shapes, being a powerful tool
to perform the optimization of these systems. The results obtained by
the proposed method have shown excellent agreement with Monte Carlo
estimates for DD-OFDM ultra-wideband radio signals and for two different
DD-OFDM signals proposed for long-haul systems.