Nonlinearity compensation using optical phase conjugation deployed in discretely amplified transmission systems

Mohammad Al-Khateeb, Mary E. McCarthy, Christian Sánchez, Andrew D. Ellis

Research output: Contribution to journalArticlepeer-review


We introduce a closed form equation, validated by simulations and experimental
results, that predicts the residual nonlinear noise ratio in mid-link OPC assisted discretely amplified systems. The model anticipates the reduction in performance enhancement achieved by mid-link OPC as the bandwidth of the modulated signals increases. The numerical analysis shows that uncompensated signal-signal interactions limit the performance improvement achieved by the introduction of additional OPCs. The numerical analysis predicts that the deployment of shorter amplifier spacing will lead to a greater performance enhancement. The numerical results are validated by experimentally testing of 2x, 4x, and 8x28Gbaud PM-QPSK systems with mid-link OPC compensation in a discretely amplified system with 100km amplifier spacing. The experimentally obtained reach enhancement (43%, 32%, and 24% for 2x28Gbaud, 4x28Gbaud, and 8x28Gbaud, respectively) confirms that the compensation efficiency of mid-link OPC is highly dependent on the number of channels (bandwidth) propagating along the system.
Original languageEnglish
Pages (from-to)23945-23959
JournalOptics Express
Issue number18
Publication statusPublished - 31 Aug 2018

Bibliographical note

Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Funding: EPSRC EP/J017582/1 [UNLOC]; EP/L000091/1; H2020 659950 [INVENTION].


  • Optical communications
  • Phase conjugation
  • Nonlinear optics
  • Fibers


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