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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editors: K. Bergman and V. Chan
  • Vol. 1, Iss. 5 — Oct. 1, 2009
  • pp: 439–451

Impact of LED Nonlinearity on Discrete Multitone Modulation

Beril Inan, S. C. Jeffrey Lee, Sebastian Randel, Ioannis Neokosmidis, Antonius M.J. Koonen, and Joachim W. Walewski  »View Author Affiliations

Journal of Optical Communications and Networking, Vol. 1, Issue 5, pp. 439-451 (2009)

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In the context of communications based on light-emitting diodes (LEDs), spectrally efficient modulation has been considered for overcoming their limited bandwidth, and one scheme under investigation is quadrature-amplitude modulation on discrete multitones. The dependence of the output optical power on the driving current of practical LEDs is nonlinear, which distorts the transmitted signal. We investigate the impact of the nonlinear LED transfer function, i.e., the dependence of the emitted optical power on the driving current, on discrete multitone modulation. The effect incurred by this distortion was analyzed by using detailed numerical simulations addressing the impact of clipping, individual subcarriers, signal-to-noise ratio, and bit-error ratio. The approach was generalized to describe the impact of the nonlinearity of arbitrary LEDs and laser diodes, resulting in a powerful tool for assessing the impact of the nonlinearity on the link performance. This approach was applied to three types of LED, showing anything from a minuscule effect to the case in which error-free data transmission is made impossible by the transfer-function nonlinearity.

© 2009 Optical Society of America

OCIS Codes
(060.4510) Fiber optics and optical communications : Optical communications
(230.3670) Optical devices : Light-emitting diodes
(060.2605) Fiber optics and optical communications : Free-space optical communication

ToC Category:
Research Papers

Original Manuscript: June 11, 2009
Revised Manuscript: August 20, 2009
Manuscript Accepted: August 20, 2009
Published: September 18, 2009

Beril Inan, S. C. Jeffrey Lee, Sebastian Randel, Ioannis Neokosmidis, Antonius M.J. Koonen, and Joachim W. Walewski, "Impact of LED Nonlinearity on Discrete Multitone Modulation," J. Opt. Commun. Netw. 1, 439-451 (2009)

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