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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 6 — Mar. 25, 2013
  • pp: 7354–7361

Nonlinearity mitigation for high-speed optical OFDM transmitters using digital pre-distortion

Yuan Bao, Zhaohui Li, Jianping Li, Xinhuan Feng, Bai-ou Guan, and Guifang Li  »View Author Affiliations


Optics Express, Vol. 21, Issue 6, pp. 7354-7361 (2013)
http://dx.doi.org/10.1364/OE.21.007354


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Abstract

Optical orthogonal frequency-division multiplexing (OOFDM) signal is sensitive to nonlinear distortions induced by optical modulators. We propose and experimentally demonstrate a digital pre-distortion (DPD) algorithm to linearize the optical modulators including electro-absorption modulated lasers (EML) and Mach-Zehnder modulators (MZM) used in high-speed OOFDM transmitters. By using an adaptive DPD algorithm with a learning structure, the inverse transfer function of a modulator, which is based on a polynomial model, has been obtained. In the experiment, the performance improvements with and without considering the memory effects of the DPD model are illustrated. The two typical kinds of high-speed OOFDM signals with a bit rate up to 30-Gb/s have been implemented experimentally. The results show that the nonlinear distortion induced by optical modulators can be compensated by using the DPD algorithm to substantially improve the optical modulation index.

© 2013 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(230.4110) Optical devices : Modulators

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: December 28, 2012
Revised Manuscript: March 4, 2013
Manuscript Accepted: March 4, 2013
Published: March 15, 2013

Citation
Yuan Bao, Zhaohui Li, Jianping Li, Xinhuan Feng, Bai-ou Guan, and Guifang Li, "Nonlinearity mitigation for high-speed optical OFDM transmitters using digital pre-distortion," Opt. Express 21, 7354-7361 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-6-7354


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References

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