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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 24 — Nov. 21, 2011
  • pp: 24331–24343

Feedforward carrier recovery via pilot-aided transmission for single-carrier systems with arbitrary M-QAM constellations

Mohamed Morsy-Osman, Qunbi Zhuge, Lawrence R. Chen, and David V. Plant  »View Author Affiliations

Optics Express, Vol. 19, Issue 24, pp. 24331-24343 (2011)

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We exploit pilot-aided (PA) transmission enabled by single-sideband (SSB) subcarrier modulation of both quadrature signals in the DSP domain to achieve fully feedforward carrier recovery (FFCR) in single-carrier (SC) coherent systems with arbitrary M-QAM constellations. A thorough mathematical description of the proposed PA-FFCR is presented, its linewidth tolerance is assessed by simulations and compared to other FFCR schemes in literature. Also, implementation and complexity issues of PA-FFCR are presented and briefly compared with other CR schemes. Simulation results show that PA-FFCR performs close to the best known CR technique in the literature with less computation complexity. Quantitatively, for 1 dB optical-signal-to-noise-ratio (OSNR) penalty at BER = 3.8 × 10−3, PA-FFCR tolerates linewidth-symbol-duration products (Δf.Ts) of 1.5 × 10−4 (4-QAM), 4 × 10−5 (16-QAM) and 1 × 10−5 (64-QAM). Finally, we propose the use of maximum likelihood (ML) phase estimation next to pilot phase compensation. This significantly improves tolerable Δf.Ts values to 7.5 × 10−4 (4-QAM), 1.8 × 10−4 (16-QAM) and 3.5 × 10−5 (64-QAM). It turns out that PA-FFCR with ML always performs better or at least the same compared to other CR techniques known in literature with lower complexity in addition to the fact that pilot information can be as well exploited for tasks other than CR e.g., fiber nonlinearity compensation, with no extra complexity.

© 2011 OSA

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: August 10, 2011
Revised Manuscript: October 15, 2011
Manuscript Accepted: October 19, 2011
Published: November 14, 2011

Mohamed Morsy-Osman, Qunbi Zhuge, Lawrence R. Chen, and David V. Plant, "Feedforward carrier recovery via pilot-aided transmission for single-carrier systems with arbitraryM-QAM constellations," Opt. Express 19, 24331-24343 (2011)

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