Phase-conjugated pilots for fibre nonlinearity compensation in CO-OFDM transmission

Thai Son Le, Mary E. McCarthy, Naoise Mac Suibhne, Andrew D. Ellis, Sergei K. Turitsyn

Research output: Contribution to journalArticlepeer-review


In this paper, we demonstrate a novel fiber nonlinearity compensation technique for coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems based on the transmission of phase-conjugated pilots (PCPs). In this scheme, a portion of OFDM subcarriers (up to 50%) is transmitted with its phase conjugates, which is used at the receiver to estimate the nonlinear distortions in the respective subcarriers and other subcarriers, which are not accompanied by PCPs. Simulation and experimental results show that by varying the PCP overhead, a performance improvement up to 4 dB can be achieved. In addition, the proposed technique can be effectively applied in both single polarization and polarization-division multiplexed systems, in both single channel and wavelength-division multiplexing systems, thus, offering highest flexibility in implementations.

Original languageEnglish
Pages (from-to)1308-1314
Number of pages7
JournalJournal of Lightwave Technology
Issue number7
Early online date9 Mar 2015
Publication statusPublished - 1 Apr 2015

Bibliographical note

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Funding: Sterlite Technologies and Finisar; European Commission (258033 (MODE-GAP), 318415 (FOX-C)); EPSRC (EP/J017582/1, EP/L000091/1).


  • coherent detection
  • coherent optical transmission
  • Nonlinearity mitigation
  • orthogonal frequency division multiplexing


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