title: Power pre-emphasis for suppression of FWM in coherent optical OFDM transmission.
abstract: Four-wave-mixing (FWM) due to the fiber nonlinearity is a major limiting factor in coherent optical OFDM transmission. We propose to apply power pre-emphasis, i.e. to allocate the transmitted power non-uniformly among subcarriers in order to suppress the FWM impairment. The proposed technique was numerically investigated for both single channel 15.6 Gbs CO-OFDM transmissions and 7-channel WDM transmissions, showing that up to 1 dB improvement in the system's Q-factor can be achieved without considering sophisticated power loading algorithms developed for wireless communications.
authors.forename: Son Thai
authors.initials: ST
authors.lastname: Le
authors.forename: Keith
authors.initials: K
authors.lastname: Blow
authors.forename: Sergei
authors.initials: S
authors.lastname: Turitsyn