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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 5 — Feb. 28, 2011
  • pp: 4472–4484

Dispersion-enhanced phase noise effects on reduced-guard-interval CO-OFDM transmission

Qunbi Zhuge, Chen Chen, and David V. Plant  »View Author Affiliations

Optics Express, Vol. 19, Issue 5, pp. 4472-4484 (2011)

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Unlike conventional CO-OFDM systems, we show in this paper that reduced-guard-interval (RGI) CO-OFDM systems experience subcarrier-dependent phase noise (PN) from the local oscillator laser. This phenomenon manifests in RGI-CO-COFM systems because the chromatic dispersion (CD) induced walk-off becomes comparable to the OFDM symbol length. We term this phenomenon the dispersion enhanced PN (DEPN). In this work an analytical study of the impact of DEPN on CO-OFDM transmission is conducted. We develop a system-level analytical model and calculate the variance of the dispersion-induced subcarrier-dependent phase rotation term (PRT) using two different distribution patterns of pilot subcarriers (PS). Moreover, we present a bit error rate (BER) estimator to quantify the system performance degradation due to PRT. Numerical simulations are then performed to verify the analytical model. Finally, we propose a grouped maximum-likelihood (GML) phase estimation approach to mitigate the DEPN impairment, and demonstrate a 0.7-1.7 dB SNR improvement at BER = 10−3 for typical 100 Gb/s RGI CO-OFDM systems.

© 2011 OSA

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: December 22, 2010
Revised Manuscript: February 6, 2011
Manuscript Accepted: February 6, 2011
Published: February 23, 2011

Qunbi Zhuge, Chen Chen, and David V. Plant, "Dispersion-enhanced phase noise effects on reduced-guard-interval CO-OFDM transmission," Opt. Express 19, 4472-4484 (2011)

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