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The authors demonstrate +11 dBm-per-channel 320 Gbit/s (8 × 40 Gbit/s) WDM transmission over a 367 km zero-dispersion-flattened transmission line with 120 km repeater spacing using a nonlinearity-tolerant carrier-suppressed return-to-zero format.
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Miyamoto et al. (1999) studied this question.
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