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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 7 — Apr. 8, 2013
  • pp: 8261–8268

Power margin improvement for OFDMA-PON using hierarchical modulation

Pan Cao, Xiaofeng Hu, Zhiming Zhuang, Liang Zhang, Qingjiang Chang, Qi Yang, Rong Hu, and Yikai Su  »View Author Affiliations

Optics Express, Vol. 21, Issue 7, pp. 8261-8268 (2013)

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We propose and experimentally demonstrate a hierarchical modulation scheme to improve power margin for orthogonal frequency division multiple access-passive optical networks (OFDMA-PONs). In a PON system, under the same launched optical power, optical network units (ONUs) have different power margins due to unequal distribution fiber lengths. The power margin of the PON system is determined by the ONU with the lowest power margin. In our proposed scheme, ONUs with long and short distribution fibers are grouped together, and downstream signals for the paired ONUs are mapped onto the same OFDM subcarriers using hierarchical modulation. In a pair of ONUs, part of the power margin of the ONU with short distribution fiber is re-allocated to the ONU with long distribution fiber. Therefore, the power margin of the ONU with the longest distribution fiber can be increased, leading to the power margin improvement of the PON system. Experimental results show that the hierarchical modulation scheme improves the power margin by 2.7 dB for an OFDMA-PON system, which can be used to support more users or extend transmission distance.

© 2013 OSA

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4250) Fiber optics and optical communications : Networks

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: January 8, 2013
Revised Manuscript: February 23, 2013
Manuscript Accepted: February 25, 2013
Published: March 28, 2013

Pan Cao, Xiaofeng Hu, Zhiming Zhuang, Liang Zhang, Qingjiang Chang, Qi Yang, Rong Hu, and Yikai Su, "Power margin improvement for OFDMA-PON using hierarchical modulation," Opt. Express 21, 8261-8268 (2013)

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