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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 9 — May. 5, 2014
  • pp: 10844–10857

Digital quadrature amplitude modulation with optimized non-rectangular constellations for 100 Gb/s transmission by a directly-modulated laser

William A. Ling, Ilya Lyubomirsky, and Olav Solgaard  »View Author Affiliations


Optics Express, Vol. 22, Issue 9, pp. 10844-10857 (2014)
http://dx.doi.org/10.1364/OE.22.010844


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Abstract

We study the performance of novel quadrature amplitude modulation (QAM) constellations for 100 Gb/s transmission by a directly-modulated laser. Due to the strong nonlinearity of a directly-modulated laser, rectangular constellations suffer a large penalty from their regular spacing between symbols. We present a method for synthesizing irregular constellations which position symbols more efficiently. We will demonstrate the improved performance of these novel constellations over the conventional rectangular constellation as well as the superior performance achievable with digital QAM compared to optimally bit-loaded discrete-multitone modulation.

© 2014 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation
(060.4510) Fiber optics and optical communications : Optical communications

ToC Category:
Optical Communications

History
Original Manuscript: January 23, 2014
Revised Manuscript: April 14, 2014
Manuscript Accepted: April 16, 2014
Published: April 29, 2014

Citation
William A. Ling, Ilya Lyubomirsky, and Olav Solgaard, "Digital quadrature amplitude modulation with optimized non-rectangular constellations for 100 Gb/s transmission by a directly-modulated laser," Opt. Express 22, 10844-10857 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-9-10844


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