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.
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.
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