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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 32, Iss. 6 — Mar. 15, 2014
  • pp: 1228–1238

DFT Precoded OFDM—An Alternative Candidate for Next Generation PONs

Tuan-Anh Truong, Matthieu Arzel, Hao Lin, Bruno Jahan, and Michel Jézéquel

Journal of Lightwave Technology, Vol. 32, Issue 6, pp. 1228-1238 (2014)


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Abstract

Recently, the orthogonal frequency division multiplexing (OFDM) technique has been extensively studied for fiber-based optical transmissions in the context of access networks. The adaptive modulation optical (AMO) OFDM system has been proved to be one of the cost-effective solutions. Among adaptive modulation techniques, the Levin–Campello (LC) bit/power loading, which is widely implemented for xDSL systems, is shown to bring excellent performances in unamplified optical intensity modulated/direct detected (IMDD) transmissions. In this paper a novel adaptive discrete Fourier transform precoded OFDM (POFDM) is proposed and investigated. By means of numerical simulation, the proposed modulation scheme is shown to reduce the peak-to-average power ratio of the transmitted OFDM signal up to 2 dB at 10 $^{-3}$ clipping rate. As a consequence, a smaller input back-off can be applied to the laser-driving current before the power amplifier, resulting in a lower power consumption of the POFDM system when compared to the conventional LC AMOOFDM system. According to simulation results, the energy consumption of the power amplifier is reduced by a factor of two in unamplified optical IMDD transmissions. Moreover, in terms of capacity-versus-reach performance, the proposed system achieves the same performance as the conventional adaptive modulation scheme.

© 2014 IEEE

Citation
Tuan-Anh Truong, Matthieu Arzel, Hao Lin, Bruno Jahan, and Michel Jézéquel, "DFT Precoded OFDM—An Alternative Candidate for Next Generation PONs," J. Lightwave Technol. 32, 1228-1238 (2014)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-32-6-1228

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