Abstract
One of major issues of the advanced optical communication system is the
signal distortion caused by fiber nonlinearity. Both predistorters and
equalizers have been used for nonlinearity compensation and electrical
compensation has become a popular choice among optical communication
engineers in recent years. However, to the best of the authors' knowledge,
no comparative study about electrical equalizers and predistorters has been
conducted for optical communication systems. Using a coherent optical
orthogonal frequency division multiplexing (CO-OFDM) system as a test
system, we investigated the performance of electrical $p$th-order inverse Volterra predistorters and equalizers. Our
research results show that both the equalizer and the predistorter can
compensate for the nonlinearity of the CO-OFDM system. The major difference
between the predistorter and the equalizer is that the predistorter
regulates the input power; therefore, the performance of the CO-OFDM system
with a predistorter is independent over a wide range of the laser launch
power. The results presented in this paper can lead to a better
understanding of electrical equalization and predistortion techniques for
optical communication systems.
© 2011 IEEE
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