Abstract
Resulted from the narrow frequency interval, the nonlinear impairments are
strongly related with the data correlation of the optical orthogonal
frequency division (OFDM) symbol in coherent optical OFDM (CO-OFDM) system,
which is very different from the traditional WDM optical communication
systems. The concept of normalized accumulative correlation coefficient
(NACC) is proposed to evaluate the data correlation of the OFDM symbol. The
parameter $\phi$ is presented to describe the influence of the systematic physical
configuration on the nonlinear impairments. The dependence of the nonlinear
impairments on the data correlation is investigated and revealed
analytically. Closed form expressions are presented to calculate the noise
spectrum, total nonlinear noise energy and noise signal ratio (NSR) under
the condition that $\phi \leq 0.2$, which is valid for most practical CO-OFDM system. The NSR is
proportional to the NACC and $\phi ^2$. Simulation results are well consistent with analytical
calculations when $\phi \leq 0.2$.
© 2009 IEEE
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