All-optical 2R regeneration of 40-Gb/s signal impaired by intrachannel four-wave mixing

We experimentally investigate the ability of an alloptical 2R regenerator to suppress impairments caused by intra-channel four-wave mixing (IFWM) and intrachannel cross-phase modulation (IXPM), which are the two dominant nonlinear effects in 40-Gb/s pseudolinear transmission systems. The 2R regenerator suppresses amplitude fluctuations and shadow pulses induced by IFWM in 80-km transmission over standard single-mode fiber, allowing an increase of signal power by similar to3 dB. However, the 211 regenerator shows little improvement for an 80-km TrueWave RS fiber, where timing jitter originating from IXPM dominates.