Abstract
Differential phase shift keying (DPSK) modulation is being considered as a possible
candidate for future optical wavelength division multiplexed (WDM) transmission systems. In a
single channel link, the balanced interferometric DPSK receiver exhibits increased tolerance
against amplified spontaneous emitting (ASE) noise and fiber nonlinear effects. In this paper,
a model is presented that can be used to estimate the performance of a multichannel DPSK
system taking into account the influence of interchannel phenomena, namely cross-phase
modulation (XPM) and four wave mixing (FWM), in the phase noise statistics. The model is based
on an approximate solution of the fiber propagation equation and the multicanonical Monte
Carlo (MCMC) method. It provides an efficient tool that can be used to investigate the
influence of many link design parameters such as channel spacing, launch power, and fiber
dispersion. The model is illustrated in the comparison of the performance of multichannel DPSK
to on-off keying (OOK) systems. It is verified that, even in the presence of interchannel
effects, DPSK modulation greatly enhances the system performance compared to OOK.
© 2009 IEEE
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