Four-wave mixing in amplified WDM system with anomalous dispersion fibers

Summary form only given. The effect of four wave mixing (FWM) on wavelength-division multiplexing (WDM) optical fiber systems has long been studied, as it causes crosstalk and degrades system performance. It is known that FWM efficiency depends on the optical signal powers and the phase matching condition between different signal channels traveling along the fiber. In this paper, we report that FWM efficiency can be significantly enhanced by modulation instability (MI) in amplified optical systems with anomalous dispersions. The experimental result is verified by a numerical simulation. This effect has to be taken into account in WDM system designs.