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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 17 — Aug. 13, 2012
  • pp: 19599–19609

Pilot-aided carrier phase recovery for M-QAM using superscalar parallelization based PLL

Qunbi Zhuge, Mohamed Morsy-Osman, Xian Xu, Mohammad E. Mousa-Pasandi, Mathieu Chagnon, Ziad A. El-Sahn, and David V. Plant  »View Author Affiliations

Optics Express, Vol. 20, Issue 17, pp. 19599-19609 (2012)

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In this paper, we present a carrier phase recovery (CPR) algorithm using a modified superscalar parallelization based phase locked loop (M-SSP-PLL) combined with a maximum-likelihood (ML) phase estimation. Compared to the original SSP-PLL, M-SSP-PLL + ML reduces the required buffer size using a novel superscalar structure. In addition, by removing the differential coding/decoding and employing ML phase recovery it also improves the performance. In simulation, we show that the laser linewidth tolerance of M-SSP-PLL + ML is comparable to blind phase search (BPS) algorithm, which is known to be one of the best CPR algorithms in terms of performance for arbitrary QAM formats. In 28 Gbaud QPSK (112 Gb/s) and 16-QAM (224 Gb/s), and 7 Gbaud 64-QAM (84 Gb/s) experiments, it is also demonstrated that M-SSP-PLL + ML can increase the transmission distance by at least 12% compared to BPS for each of them. Finally, the computational complexity is discussed and a significant reduction is shown for our algorithm with respect to BPS.

© 2012 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: July 17, 2012
Revised Manuscript: August 7, 2012
Manuscript Accepted: August 7, 2012
Published: August 10, 2012

Qunbi Zhuge, Mohamed Morsy-Osman, Xian Xu, Mohammad E. Mousa-Pasandi, Mathieu Chagnon, Ziad A. El-Sahn, and David V. Plant, "Pilot-aided carrier phase recovery for M-QAM using superscalar parallelization based PLL," Opt. Express 20, 19599-19609 (2012)

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