Influence of DCM Nonlinearity on the XPM Degradation in 10 Gbit/s Dispersion Managed NRZ-IM-DD Links

摘要

The impact of the nonlinear effects in the disper sion compensating module (DCM) on the dispersion maps that minimize the cross-phase modulation (XPM) induced degradation is studied extensively through numerical simu lation. Particularly, the dependence of the optimum dis persion map on the power level at the DCM input is ana lyzed for 10 Gbit/s wavelength division multiplexing links with 25 GHz, 50 GHz and 100 GHz of channel spacing and two types of transmission ?bers. The dispersion map that leads to the XPM minimization is compared with the dis persion map that presents a good compromise between the XPM-induced degradation and the XPM tolerance to dis persion map variation. It is shown that the latter presents a XPM-induced degradation slightly higher than the ?rst one but the optimum dispersion map remains unchanged when the power level at DCM input increases while the dis persion map that minimizes the XPM-induced degradation varies considerably. It is also shown that the in?uence of the DCM nonlinearity on the variance of XPM-induced in tensity distortion is higher for standard single-mode ?ber than for e-LEAF ?ber. For all the analyzed, situations the DCM nonlinearity has a weak in?uence on the XPM induced degradation, even for power levels at DCM input of -3 dBm.