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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 15 — Jul. 28, 2014
  • pp: 17691–17699

Experimental demonstration of real-time adaptively modulated DDO-OFDM systems with a high spectral efficiency up to 5.76bit/s/Hz transmission over SMF links

Ming Chen, Jing He, Jin Tang, Xian Wu, and Lin Chen  »View Author Affiliations

Optics Express, Vol. 22, Issue 15, pp. 17691-17699 (2014)

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In this paper, a FPGAs-based real-time adaptively modulated 256/64/16QAM-encoded base-band OFDM transceiver with a high spectral efficiency up to 5.76bit/s/Hz is successfully developed, and experimentally demonstrated in a simple intensity-modulated direct-detection optical communication system. Experimental results show that it is feasible to transmit a raw signal bit rate of 7.19Gbps adaptively modulated real-time optical OFDM signal over 20km and 50km single mode fibers (SMFs). The performance comparison between real-time and off-line digital signal processing is performed, and the results show that there is a negligible power penalty. In addition, to obtain the best transmission performance, direct-current (DC) bias voltage for MZM and launch power into optical fiber links are explored in the real-time optical OFDM systems.

© 2014 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(060.4080) Fiber optics and optical communications : Modulation

ToC Category:
Optical Communications

Original Manuscript: May 6, 2014
Revised Manuscript: June 21, 2014
Manuscript Accepted: July 2, 2014
Published: July 14, 2014

Ming Chen, Jing He, Jin Tang, Xian Wu, and Lin Chen, "Experimental demonstration of real-time adaptively modulated DDO-OFDM systems with a high spectral efficiency up to 5.76bit/s/Hz transmission over SMF links," Opt. Express 22, 17691-17699 (2014)

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