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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 7 — Apr. 7, 2014
  • pp: 8742–8748

Demonstration of DFT-spread 256QAM-OFDM signal transmission with cost-effective directly modulated laser

Fan Li, Jianjun Yu, Yuan Fang, Ze Dong, Xinying Li, and Lin Chen  »View Author Affiliations

Optics Express, Vol. 22, Issue 7, pp. 8742-8748 (2014)

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We experimentally demonstrated a 256-ary quadrature amplitude modulation (256QAM) direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) transmission system utilizing a cost-effective directly modulated laser (DML). Intra-symbol frequency-domain averaging (ISFA) is applied to suppress in-band noise while the channel response estimation and Discrete Fourier Transform-spread (DFT-spread) is used to reduce the peak-to-average power ratio (PAPR) of the transmitted OFDM signal. The bit-error ratio (BER) of 15-Gbit/s 256QAM-OFDM signal has been measured after 20-km SSMF transmission that is less than 7% forward-error-correction (FEC) threshold of 3.8 × 10−3 as the launch power into fiber is set at 6dBm. For 11.85-Gbit/s 256QAM-OFDM signal, with the aid of ISFA-based channel estimation and PAPR reduction enabled by DFT-spread, the BER after 20-km SSMF transmission can be improved from 6.4 × 10−3 to 6.8 × 10−4 when the received optical power is −6dBm.

© 2014 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems

ToC Category:
Optical Communications

Original Manuscript: January 23, 2014
Revised Manuscript: March 28, 2014
Manuscript Accepted: March 28, 2014
Published: April 4, 2014

Fan Li, Jianjun Yu, Yuan Fang, Ze Dong, Xinying Li, and Lin Chen, "Demonstration of DFT-spread 256QAM-OFDM signal transmission with cost-effective directly modulated laser," Opt. Express 22, 8742-8748 (2014)

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