30% Reach Increase via Low-complexity Hybrid HD/SD FEC and Improved 4D Modulation

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Current optical coherent transponders technology is driving data rates towards 1 Tb/s/λ and beyond. This trend requires both high-performance coded modulation schemes and efficient implementation of the forward-error-correction (FEC) decoder. A possible solution to this problem is combining advanced multidimensional modulation formats with low-complexity hybrid HD/SD FEC decoders. Following this rationale, in this paper we combine two recently introduced coded modulation techniques: the geometrically-shaped 4D-64 polarization ring-switched and the soft-aided bit-marking-scaled reliability decoder. This joint scheme enabled us to experimentally demonstrate the transmission of 11×218 Gbit/s channels over transatlantic distances at 5.2 bit/4D-sym. Furthermore, a 30% reach increase is demonstrated over PM-8QAM and conventional HD-FEC decoding for product codes.
Original languageEnglish
Article number9096398
Pages (from-to)827-830
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number13
Early online date19 May 2020
Publication statusPublished - 1 Jul 2020


  • Forward error correction~(FEC)
  • optical fiber communication
  • product codes (PCs)


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