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Transmission of 16 nonreturn-to-zero on-off keying channels at 40 Gb/s with 100-GHz spacing is demonstrated over 2800 km. This record transmission distance was made possible by the 2-dB increase in power tolerance obtained when employing the cost-effective asynchronous phase modulation technique.
We propose a cost-effective way to increase the non-linear tolerance of all channels in a 40-Gb/s WDM transmission system, which is shown to greatly improve the performance of RZ and especially NRZ transmission.
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