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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 7 — Mar. 26, 2012
  • pp: 7350–7361

A simple and efficient frequency offset estimation algorithm for high-speed coherent optical OFDM systems

Xian Zhou, Keping Long, Rui Li, Xiaolong Yang, and Zhongshan Zhang  »View Author Affiliations

Optics Express, Vol. 20, Issue 7, pp. 7350-7361 (2012)

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In this paper, we propose a simple frequency offset estimation (FOE) algorithm for high-speed coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems, which avoids the exhaustive search computations on the integer part of FOE by using a merit function. In time domain, the FOE algorithm can estimate all the frequency offset in the range of [-5GHz, +5GHz], for satisfying the practical application requirement, based on only one redesigned training symbol. In addition, we provide the theoretical analysis about the quantitative influences of the residual frequency offset (RFO) on CO-OFDM systems. In order to reduce the final estimation error, a new zero-overhead residual frequency offset estimation (RFOE) algorithm is also proposed in this paper. Finally, the feasibility and effectiveness of the proposed FOE and RFOE algorithms are demonstrated in a 464 Gbit/s polarization-division multiplexed (PDM) 16-ary quadrature amplitude modulation (QAM) CO-OFDM system by the simulation, and numerical results validate the proposed algorithms.

© 2012 OSA

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.4510) Fiber optics and optical communications : Optical communications

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: January 10, 2012
Revised Manuscript: March 2, 2012
Manuscript Accepted: March 8, 2012
Published: March 15, 2012

Xian Zhou, Keping Long, Rui Li, Xiaolong Yang, and Zhongshan Zhang, "A simple and efficient frequency offset estimation algorithm for high-speed coherent optical OFDM systems," Opt. Express 20, 7350-7361 (2012)

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