We demonstrate a 140 Gbit/s coherent optical transmission over 150 km with a polarization-multiplexed 10 Gsymbol/s, 128 QAM format in a 20 GHz bandwidth. Error-free 120 Gbit/s-150 km transmission is also realized with 64 QAM.

© 2010 IEEE Communications Society, IEEE Photonics Society, OSA, Telcordia

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