256 QAM (64 Gbit/s) coherent optical transmission over 160 km with an optical bandwidth of 5.4 GHz

We present the first demonstration of 256 QAM coherent optical transmission, where 64 Gbit/s polarization-multiplexed data at 4 Gsymbol/s were successfully transmitted over 160 km with an optical bandwidth of only 5.4 GHz.

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