Demonstration of phase-conjugated subcarrier coding for fiber nonlinearity compensation in CO-OFDM transmission

Son Thai Le, Mary E. McCarthy, Naoise Mac Suibhne, Mohammad A.Z. Al-Khateeb, Elias Giacoumidis, Nick Doran, Andrew D. Ellis, Sergei K. Turitsyn

Research output: Contribution to journalArticlepeer-review


In this paper, we demonstrate through computer simulation and experiment a novel subcarrier coding scheme combined with pre-electrical dispersion compensation (pre-EDC) for fiber nonlinearity mitigation in coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. As the frequency spacing in CO-OFDM systems is usually small (tens of MHz), neighbouring subcarriers tend to experience correlated nonlinear distortions after propagation over a fiber link. As a consequence, nonlinearity mitigation can be achieved by encoding and processing neighbouring OFDM subcarriers simultaneously. Herein, we propose to adopt the concept of dual phase conjugated twin wave for CO-OFDM transmission. Simulation and experimental results show that this simple technique combined with 50% pre-EDC can effectively offer up to 1.5 and 0.8 dB performance gains in CO-OFDM systems with BPSK and QPSK modulation formats, respectively.

Original languageEnglish
Pages (from-to)2206-2212
Number of pages7
JournalJournal of Lightwave Technology
Issue number11
Early online date13 Mar 2015
Publication statusPublished - 1 Jun 2015

Bibliographical note

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Funding: Research funded by Sterlite Technologies and Finisar; European Commission's 7th Framework Programme (258033, 318137, 318415); and EPSRC (EP/J017582/1, EP/L000091/1).


  • coherent detection
  • coherent optical transmission
  • nonlinearity mitigation
  • orthogonal frequency division multiplexing.


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