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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 15 — Jul. 21, 2008
  • pp: 11344–11353

Partial bit delay correlative modulation used to improve the dispersion tolerance of an optical duobinary system

Zhongxi Zhang, Liang Chen, Xiaoyi Bao, and Ahmad Atieh  »View Author Affiliations

Optics Express, Vol. 16, Issue 15, pp. 11344-11353 (2008)

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Phase effect of the optical duobinary (ODB) modulation on the chromatic dispersion (CD) tolerance is more important than the ODB modulation-induced bandwidth effect. To show this, we evaluate, respectively, the filter bandwidth effect and the phase effect of the partial bit delay correlative modulation (PBDCM) on the CD tolerance. Due to the cancellation between the CD-induced and the PBDCM-induced phase effects, the PBDCM method can increase the CD-limited transmission to 2 ~ 3 times of that using standard 1-bit delay modulation, while the optimized filter bandwidth method can increase the transmission by 50% or less, depending on the input signal format. The PBDCM can be physically realized by adjusting the delay time of the delay-and-add circuit in the conventional duobinary transmitter (without lower-pass filter). These conclusions are also valid for systems having non-negligible polarization-mode dispersion (PMD) and polarization dependent loss (PDL).

© 2008 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation
(260.2030) Physical optics : Dispersion

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: March 19, 2008
Revised Manuscript: June 23, 2008
Manuscript Accepted: July 4, 2008
Published: July 14, 2008

Zhongxi Zhang, Liang Chen, Xiaoyi Bao, and Ahmad Atieh, "Partial bit delay correlative modulation used to improve the dispersion tolerance of an optical duobinary system," Opt. Express 16, 11344-11353 (2008)

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