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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 11 — Jun. 2, 2014
  • pp: 13454–13459

Digital coherent superposition of optical OFDM subcarrier pairs with Hermitian symmetry for phase noise mitigation

Xingwen Yi, Xuemei Chen, Dinesh Sharma, Chao Li, Ming Luo, Qi Yang, Zhaohui Li, and Kun Qiu  »View Author Affiliations

Optics Express, Vol. 22, Issue 11, pp. 13454-13459 (2014)

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Digital coherent superposition (DCS) provides an approach to combat fiber nonlinearities by trading off the spectrum efficiency. In analogy, we extend the concept of DCS to the optical OFDM subcarrier pairs with Hermitian symmetry to combat the linear and nonlinear phase noise. At the transmitter, we simply use a real-valued OFDM signal to drive a Mach-Zehnder (MZ) intensity modulator biased at the null point and the so-generated OFDM signal is Hermitian in the frequency domain. At receiver, after the conventional OFDM signal processing, we conduct DCS of the optical OFDM subcarrier pairs, which requires only conjugation and summation. We show that the inter-carrier-interference (ICI) due to phase noise can be reduced because of the Hermitain symmetry. In a simulation, this method improves the tolerance to the laser phase noise. In a nonlinear WDM transmission experiment, this method also achieves better performance under the influence of cross phase modulation (XPM).

© 2014 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.4080) Fiber optics and optical communications : Modulation
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers

ToC Category:
Optical Communications

Original Manuscript: April 16, 2014
Revised Manuscript: May 19, 2014
Manuscript Accepted: May 20, 2014
Published: May 27, 2014

Xingwen Yi, Xuemei Chen, Dinesh Sharma, Chao Li, Ming Luo, Qi Yang, Zhaohui Li, and Kun Qiu, "Digital coherent superposition of optical OFDM subcarrier pairs with Hermitian symmetry for phase noise mitigation," Opt. Express 22, 13454-13459 (2014)

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