Abstract:
Cross-phase modulation (XPM) changes the state-of-polarization (SOP) of the channels
through nonlinear polarization rotation and induces nonlinear time dependent phase
shift for polarization components that leads to amplitude modulation of the propagating
waves in a wavelength division multiplexing (WDM) system. Due to the presence of
birefringence, the angle between the SOP changes randomly and as a result polarization
mode dispersion (PMD) causes XPM modulation amplitude fluctuation random in the
perturbed channel. In this paper we analytically determine the probability density
function of the random angle between the SOP of pump and probe, and evaluate the
impact of polarization mode dispersion on XPM in terms of BER, channel spacing etc.
for a two channel IM-DD WDM system at 10 Gb/s. We also show the dependence of
SOP variance on PMD parameter and channel spacing.