The variance of nonlinear phase noise is analyzed by including the effect of intrachannel cross-phase modulation–induced nonlinear phase noise. Consistent with Ho and Wang [IEEE Photon. Technol. Lett. 17, 1426 (2005)] for a lightwave transmission system but contrary to the conclusions of both Kumar [Opt. Lett. 30, 3278 (2005)] and Green et al. [Opt. Lett. 28, 2455 (2003)] with different initial conditions, the variance of nonlinear phase noise does not decrease much with the increase of chromatic dispersion. The results are consistent with each other after a careful reexamination.
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