Effect of dispersion on nonlinear phase noise

Abstract

The variance of nonlinear phase noise is analyzed by including the effect of intrachannel cross-phase modulation (IXPM)-induced nonlinear phase noise. Consistent with Ho and Wang 1 but in contrary to the conclusion of both Kumar 2 and Green et al. 3 , the variance of nonlinear phase noise does not decrease much with the increase of chromatic dispersion. The results are consistent with a careful reexamination of both Kumar 2 and Green et al. 3 .c 2017 Optical Society of America OCIS codes: 060.2330OCIS codes: 060. , 190.4370, 190.4380, 260.2030 Keywords: nonlinear phase noise, intrachannel cross-phase modulation.Recently, phase-modulated optical communication systems are found to have wide applications in long-haul lightwave transmission systems 4,5 . Added directly to the signal phase, nonlinear phase noise is the major degradation for phase-modulation signals 1 . However, the recent paper by Kumar 2 and early paper by Green et al. 3 shown that, in contrary to Ho and Wang 1 , nonlinear phase noise becomes much smaller for highly dispersive transmission system than that for a system with no dispersion. The main purpose of this paper is to reconcile the discrepancy among those three letters (9) When white Gaussian noise with infinite bandwidth is assumed, the noise power approaches infinity. A finite signal-to-noise ratio requires some types of optical filter and an optical matched filter has the smallest bandwidth and does not distort the signal. Optical matched filter is used in some experimental measurements to improve the receiver sensitivity 8,9 .To make a direct comparison with Refs. 2,6, we consider a transmission system consisting of two segments of equal length within an amplified fiber span. The dispersion of the first segment is anomalous whereas that of the second segment is equal in magnitude but opposite in sign. Within each fiber span, the accumulated dispersion as a function of distance is given by S(z) = β 2 min(z, L − z) where β 2 is the group-velocity

A Discrete-Time Model for Uncompensated Single-Channel Fiber-Optical Links

“…This result was based on a first-order perturbation technique. Ho and Wang [18] analyzed the variance of the nonlinear phase noise by including the effect of intrachannel cross-phase modulation and chromatic dispersion (CD). A model based on a combined regular-logarithmic perturbation method [19] was proposed for the simultaneous presence of nonlinear and dispersive effects.…”

Statistical Analyses of ASE Noise

“…Re , , a z t a z t τ * + plays roles in the estimation of nonlinear phase noise and according to the calculation formula of [12], fifty percents of the nonlinear phase noise is under-estimated for 10 spans NZDSFs + DCFs if the nonlinear enhancement of ASE noise is not taken into account (Figure 2). …”

“…The dependence of nonlinear phase noise and quadrature component of ASE noise is studied in [12], but there are still some unknown effects generating or changing nonlinear phase noise [11] [12] [13].…”

Phase Noise Monitor and Reduction by Parametric Saturation Approach in Phase Modulation Systems

“…With a very narrowband filter as in the model of Ref. [17], the nonlinear phase noise is independent of chromatic dispersion. The variance of nonlinear phase noise decreases with the increase of optical filter bandwidth.…”