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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 3 — Feb. 10, 2014
  • pp: 3669–3674

Initial ranging scheme based on interpolated Zadoff-Chu sequences for OFDMA-PON

Ali Razmtouz, Kai Habel, Christoph Kottke, Christian Ruprecht, and Werner Rosenkranz  »View Author Affiliations

Optics Express, Vol. 22, Issue 3, pp. 3669-3674 (2014)

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Initial access to passive optical networks (PONs) requires upstream (US) synchronization of multiple optical network units (ONUs). We propose a low-complexity scheme for orthogonal frequency division multiple access (OFDMA) based PONs and demonstrate it experimentally. The scheme is based on interpolated Zadoff-Chu sequences, to synchronize the signal of each ONU arriving at the optical line terminal (OLT). Our experimental test bed consists of 4 colorless ONUs seeded by a single laser located at the OLT. Thermal expansion of a fiber is utilized to emulate a dynamic time drift in the demodulation-window positioning of OLT. The detected individual offsets at the OLT are fed back to the ONUs and are compensated at every data frame transmission. In this way, both inter carrier interference (ICI) and inter symbol interference (ISI) remain below acceptable levels.

© 2014 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.1660) Fiber optics and optical communications : Coherent communications

ToC Category:
Optical Communications

Original Manuscript: November 12, 2013
Revised Manuscript: January 10, 2014
Manuscript Accepted: January 14, 2014
Published: February 7, 2014

Ali Razmtouz, Kai Habel, Christoph Kottke, Christian Ruprecht, and Werner Rosenkranz, "Initial ranging scheme based on interpolated Zadoff-Chu sequences for OFDMA-PON," Opt. Express 22, 3669-3674 (2014)

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