A spectrally efficient linear polarization coding scheme for fiber nonlinearity compensation in CO-OFDM systems

O.S. Sunish Kumar, O.A. Dobre, R. Venkatesan, S.K. Wilson, O. Omomukuyo, A. Amari, D. Chang

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

4 Citations (Scopus)

Abstract

In this paper, we propose a linear polarization coding scheme (LPC) combined with the phase conjugated twin signals (PCTS) technique, referred to as LPC-PCTS, for fiber nonlinearity mitigation in coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. The LPC linearly combines the data symbols on the adjacent subcarriers of the OFDM symbol, one at full amplitude and the other at half amplitude. The linearly coded data is then transmitted as phase conjugate pairs on the same subcarriers of the two OFDM symbols on the two orthogonal polarizations. The nonlinear distortions added to these subcarriers are essentially anti-correlated, since they carry phase conjugate pairs of data. At the receiver, the coherent superposition of the information symbols received on these pairs of subcarriers eventually leads to the cancellation of the nonlinear distortions. We conducted numerical simulation of a single channel 200 Gb/s CO-OFDM system employing the LPC-PCTS technique. The results show that a Q-factor improvement of 2.3 dB and 1.7 dB with and without the dispersion symmetry, respectively, when compared to the recently proposed phase conjugated subcarrier coding (PCSC) technique, at an average launch power of 3 dBm. In addition, our proposed LPCPCTS technique shows a significant performance improvement when compared to the 16-quadrature amplitude modulation (QAM) with phase conjugated twin waves (PCTW) scheme, at the same spectral efficiency, for an uncompensated transmission distance of 2800 km.
Original languageEnglish
Title of host publicationNext-Generation Optical Communication: Components, Sub-Systems, and Systems VI
EditorsGiufang Li, Xiang Zhou
Place of PublicationSan Francisco
PublisherSPIE
ISBN (Electronic)9781510607019
ISBN (Print)978-1-5106-0702-6
DOIs
Publication statusPublished - 2017
Externally publishedYes

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10130
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Keywords

  • CO-OFDM
  • Coherent detection
  • Digital coherent superposition
  • Dispersion symmetry
  • Kerr nonlinearity
  • Linear polarization coding
  • Perturbation distortion and phase conjugated twin signals

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