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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editors: K. Bergman and O. Gerstel
  • Vol. 5, Iss. 6 — Jun. 1, 2013
  • pp: 584–592

Modified Synchronization Scheme for Coherent Optical OFDM Systems

Yusha Huang, Xiaoguang Zhang, and Lixia Xi  »View Author Affiliations

Journal of Optical Communications and Networking, Vol. 5, Issue 6, pp. 584-592 (2013)

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We propose a series of modified methods covering timing and frequency synchronization in the coherent optical orthogonal frequency-division-multiplexing (CO-OFDM) system. The modified timing synchronization method eliminates the ambiguity of Park’s method, and the modified frequency synchronization method employs only one training symbol without any loss of accuracy compared to Schmidl’s method. The proposed synchronization scheme is tested in a 20Gb/s CO-OFDM simulated system, with the result that the modified synchronization scheme gives a more accurate timing estimation and a more economical frequency offset estimation with a wide estimation range in the relatively short transmission distance. Meanwhile, chromatic dispersion compensation added before the synchronization keeps the modified scheme’s performance stable over longer distances and makes better subcarrier recovery with the optical signal-to-noise ratio improved by 3 dB at the bit-error rate of 103.

© 2013 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(070.2025) Fourier optics and signal processing : Discrete optical signal processing

ToC Category:
Research Papers

Original Manuscript: July 2, 2012
Revised Manuscript: March 16, 2013
Manuscript Accepted: April 18, 2013
Published: May 21, 2013

Yusha Huang, Xiaoguang Zhang, and Lixia Xi, "Modified Synchronization Scheme for Coherent Optical OFDM Systems," J. Opt. Commun. Netw. 5, 584-592 (2013)

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