Reduction of fiber four-wave mixing influence using frequency modulation in multichannel IM/DD transmission

A novel technique is proposed to reduce fiber four-wave mixing (FWM) influence on system performance in multichannel intensity-modulated/direct detection (IM/DD) transmissions. The optical frequency is modulated such that the spectrum of the beat component between the selected signal and FWM lights is spread and the effect on the beat component is reduced by filtering in the baseband stage. A numerical simulation shows that the FWM influence is reduced to less than -6 dB over conventional systems using this technique.<>