Comparison is made of 42.7 Gbit/s return-to-zero alternate mark inversion and return-to-zero on-off keying formats in a recirculating loop transmission experiment over 24×80 km standard singlemode fibre spans. It is found that RZ-AMI is more tolerant to fibre nonlinearity, in good agreement with theoretical and numerical predictions.
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Wei et al. (2003) studied this question.
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