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Proceedings Paper

Optimum signal constellations for high-speed optical metro networks and beyond
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Paper Abstract

In order achieve beyond 400 Gb/s serial optical transmission using commercially available equipment, in this work, we propose the use of channel capacity achieving modulation formats. We present a method to determine the optimum signal constellation for an arbitrary dispersion map. This method can be described by the following steps. (i) Determine the probability density functions (pdfs) of the fiber-optics channel, which can be approximated by complex Gaussian function or estimated by evaluating histograms. (ii) Use the resulting pdfs to determine the optimum input distribution to achieve the channel capacity. A split-step method is presented to perform the optimization over the probabilities and mass points of input distributions. (iii) After quantizing the optimum input distribution the optimum signal constellation can be determined. We study two types of dispersion maps currently in use, which are suitable for metro and mediumhaul applications. For each of them we determine the optimum signal constellation. The numerical results demonstrate the efficiency of this method and show that the optimized signal constellation can increase the transmission distance at most by three spans against its counterpart.

Paper Details

Date Published: 25 January 2011
PDF: 8 pages
Proc. SPIE 7959, Optical Metro Networks and Short-Haul Systems III, 795904 (25 January 2011); doi: 10.1117/12.873320
Show Author Affiliations
Jianyong Zhang, Beijing Jiaotong Univ. (China)
Ivan B. Djordjevic, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 7959:
Optical Metro Networks and Short-Haul Systems III
Werner Weiershausen; Benjamin Dingel; Achyut Kumar Dutta; Atul K. Srivastava, Editor(s)

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