Return to zero (RZ) and non-return to zero (NRZ) pulse formats are compared for multimode optical fibre systems. In both cases, the receiver filter bandwidth is optimized assuming a gaussian receiver filter response. In the case of 90 Mbps systems, the optimum bandwidth was found to be 0·6 times the symbol rate and 0·5 times the symbol rate for RZ and NRZ, respectively. Performances were evaluated at a 10-11 bit error rate and NRZ showed a 1·5 dB peak optical power advantage over RZ when there was no band limitation by the fibre. However, NRZ superiority was found to be small when there was a significant fibre bandwidth limitation.
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Murakami et al. (1983) studied this question.
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