Comparison of 128-SP-QAM and PM-16QAM in long-haul WDM transmission.

  title={Comparison of 128-SP-QAM and PM-16QAM in long-haul WDM transmission.},
  author={Tobias A. Eriksson and Martin Sj{\"o}din and Pontus Johannisson and Peter A. Andrekson and Magnus Karlsson},
  journal={Optics express},
  volume={21 16},
We investigate 128-level set-partitioning quadrature amplitude modulation (128-SP-QAM) experimentally and compare the performance to polarization-multiplexed 16QAM both at the same bit rate and at the same symbol rate. Using a recirculating loop we study both single channel and wavelength-division multiplexing (WDM) transmission and demonstrate a reach of up to 2680 km at a bit-error rate of 10(-3) for 128-SP-QAM. We confirm that 128-SP-QAM has an increased sensitivity compared to PM-16QAM and… CONTINUE READING

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