Analysis of Intrachannel Four-Wave Mixing in Differential-Phase-Shift-Keyed Transmission with Large Dispersion
01 January 2003
Intrachannel four-wave mixing (IFWM) in highly dispersed differential-phase-shift-keyed (DPSK) transmission systems is studied with a simple analytical model and numerical simulation. It is found that the IFWM effect in DPSK systems is smaller and less dependent on the bit pattern than in on-off-keyed (OOK) systems with the same average power. The reduced pulse energy in DPSK and a correlation between the nonlinear phase shifts of two adjacent pulses contribute to the robustness of DPSK against IFWM.