Analysis of intrachannel four-wave mixing in differential-phase- shift-keyed transmission with large dispersion
01 December 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.