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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 27, Iss. 10 — May. 15, 2009
  • pp: 1332–1339

Theoretical and Experimental Investigations of Direct-Detected RF-Tone-Assisted Optical OFDM Systems

Wei-Ren Peng, Xiaoxia Wu, Vahid R. Arbab, Kai-Ming Feng, Bishara Shamee, Louis C. Christen, Jeng-Yuan Yang, Alan E. Willner, and Sien Chi

Journal of Lightwave Technology, Vol. 27, Issue 10, pp. 1332-1339 (2009)


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Abstract

In this paper, we propose and experimentally demonstrate a radio frequency (RF)-tone-assisted optical orthogonal frequency-division multiplexing (OFDM) transmission. By inserting an RF tone at the edge of the signal band and biasing the Mach–Zehnder modulator (MZM) at the null point, the proposed system has a better sensitivity and chromatic dispersion (CD) tolerance compared to the previous intensity-modulated single-sideband OFDM (SSB-OFDM). We show analytically that the majority of the linear channel impairments, such as the transmitter, CD, optical filtering, and receiver, can be compensated for by a simple zero-forcing equalizer. Besides, the optimum value of the important parameter, carrier-to-signal-power ratio (CSPR), is analytically obtained and supported via the experimental results. We also observe that the relatively worse sensitivity of the previous SSB-OFDM can be attributed to the limited CSPR. We experimentally demonstrate a 10-Gb/s, 8 quadrature-amplitude modulation (QAM) RF-tone-assisted OFDM transmission, and show that our system has a ${\sim}$5-dB better sensitivity compared to the previous intensity-modulated SSB-OFDM and exhibits a negligible transmission penalty after 260-km uncompensated standard single-mode fiber (SSMF).

© 2008 IEEE

Citation
Wei-Ren Peng, Xiaoxia Wu, Vahid R. Arbab, Kai-Ming Feng, Bishara Shamee, Louis C. Christen, Jeng-Yuan Yang, Alan E. Willner, and Sien Chi, "Theoretical and Experimental Investigations of Direct-Detected RF-Tone-Assisted Optical OFDM Systems," J. Lightwave Technol. 27, 1332-1339 (2009)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-27-10-1332

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