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A closed-form expression for the normalized variance of the fluctuations induced by cross-phase modulation (XPM) in direct-detection (DD) double-sideband (DSB) orthogonal frequency-division multiplexing (OFDM) systems is proposed and validated. This expression is obtained by adapting the analytical model for XPM-induced intensity-modulated fluctuations derived in the past for conventional on–off keying...
A simplified expression allowing the estimation of the error vector magnitude (EVM) of each subcarrier of orthogonal frequency-division multiplexing (OFDM) direct-detection wavelength division multiplexing systems dominantly impaired by the cross-phase modulation is proposed and validated. This expression is then extensively used to assess the dependence of the OFDM signals performance on the number...
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