40-Gb/s return-to-zero (RZ) transmission in strong dispersion maps is limited by single-channel four-wave mixing. Appropriate phase modulation of the signal suppresses generation of the ghost pulses. Duobinary and modified duobinary encoding produce cancellation of nonlinear interaction while carrier-suppressed RZ generates perturbations that add up coherently.
© 2003 IEEE
Andrey V. Kanaev, Gregory G. Luther, Vassilios Kovanis, Scott R. Bickham, and Jan Conradi, "Ghost-Pulse Generation Suppression in Phase-Modulated 40-Gb/s RZ Transmission," J. Lightwave Technol. 21, 1486- (2003)