The performances of NRZ and RZ in nonlinear WDM systems are compared by means of numerical simulation. Self-phase modulation, cross-phase modulation, group velocity dispersion, stimulated Raman scattering and other effects are included in our numerical model. The numerical results show that the performance of NRZ in the nonlinear WDM with dispersion compensation is better than that of RZ. The full dispersion compensation does not well improve the performance of RZ transmission in nonlinear WDM.

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Wavelength division multiplexing (WDM) offers the potential to transport very high bit rates in access systems serving residential and small business customers. In this paper, we present a new scheme that combines WDMA and TDMA' s advantages for broadband fiber access network, and propose a medium access control (MAC) protocol that can realize full services accessing easily.

When the transmission signal per channel is a 10 Gbit/s RZ pulse and the amplifier span is over 100 km, proper undercompensation can enhance the nonlinear WDM system performance. Improper undercompensation or overcompensation will degrade the system performance. Cross‐phase modulation plays an important role in the nonlinear WDM system. The maximum transmission distance with the XPM effect considered is far smaller than that with the XPM effect isolated. The performance of difference channels in a nonlinear WDM system is dependent on the input power and DCF length. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 73–78, 1998.

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