Abstract
In this paper, we describe a detailed numerical investigation on performance of standard forward error correction (FEC) in 40 Gbit/s optical transmission systems with nonreturn-to-zero (NRZ), return-to-zero (RZ) and carrier-suppressed RZ (CS-RZ) modulation formats. The results show that FEC performs differently due to the different error distributions for the three formats at different power levels and transmission distances. Furthermore it is found that, with FEC on, NRZ format has a similar tolerance to intersymbol interference (ISI) due to the interactions of dispersion and nonlinearities as RZ and CS-RZ formats without FEC.
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