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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 22 — Oct. 26, 2009
  • pp: 20484–20493

Real-time demonstration of 128-QAM-encoded optical OFDM transmission with a 5.25bit/s/Hz spectral efficiency in simple IMDD systems utilizing directly modulated DFB lasers

X.Q. Jin, R.P. Giddings, E. Hugues-Salas, and J.M. Tang  »View Author Affiliations


Optics Express, Vol. 17, Issue 22, pp. 20484-20493 (2009)
http://dx.doi.org/10.1364/OE.17.020484


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Abstract

The feasibility of implementing 128-QAM in off-the-shelf component-based real-time optical OFDM (OOFDM) transceivers incorporating advanced channel estimation, on-line performance monitoring and live parameter optimisation, is experimentally investigated, for the first time, in intensity-modulation and direct-detection (IMDD) single-mode fibre (SMF) and multi-mode fibre (MMF) transmission systems involving directly modulated DFB lasers. The highest ever spectral efficiency of 5.25bit/s/Hz is demonstrated successfully in the aforementioned simple systems. Experimental investigations show that, it is feasible to transmit 5.25Gb/s 128-QAM-encoded OOFDM real-time signals over 25km MetroCorTM SMFs and 500m 62.5/125μm OM1 MMFs. The impact of key parameters on the transmission performance of the real-time OOFDM transceivers with 128-QAM encoding are explored, based on which optimum signal clipping ratios are identified.

© 2009 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: August 31, 2009
Revised Manuscript: October 21, 2009
Manuscript Accepted: October 21, 2009
Published: October 23, 2009

Citation
X.Q. Jin, R.P. Giddings, E. Hugues-Salas, and J.M. Tang, "Real-time demonstration of 128-QAM-encoded optical OFDM transmission with a 5.25bit/s/Hz spectral efficiency in simple IMDD systems utilizing directly modulated DFB lasers," Opt. Express 17, 20484-20493 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-22-20484


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