512 QAM (54 Gbit/s) coherent optical transmission over 150 km with an optical bandwidth of 4.1 GHz

@article{Okamoto2010512Q,
  title={512 QAM (54 Gbit/s) coherent optical transmission over 150 km with an optical bandwidth of 4.1 GHz},
  author={Seiji Okamoto and Kazushi Toyoda and Tatsunori Omiya and Keisuke Kasai and Masato Yoshida and Masataka Nakazawa},
  journal={36th European Conference and Exhibition on Optical Communication},
  year={2010},
  pages={1-3}
}
We report the first demonstration of 512 QAM coherent optical transmission by using an optical PLL. A polarisation-multiplexed 54 Gbit/s data signal was successfully transmitted at 3 Gsymbol/s with an optical bandwidth of 4.1 GHz including a tone signal. 
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