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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 20,
  • Issue 4,
  • pp. 608-
  • (2002)

Convergence of the Chirped Return-to-Zero and Dispersion Managed Soliton Modulation Formats in WDM Systems

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Abstract

We investigated chirped return-to-zero (CRZ) and dispersion-managed soliton (DMS) formats that have been employed in experimental demonstration systems at Tyco [1], [2], CNET [3], [4], [5], and KDD [6], [7], [8]. We find that the DMS format and the CRZ pulse format used in these systems have been converging. By careful study of noise effects, single-channel nonlinear effects, and multichannel nonlinear effects, we provide evidence that these systems all operate in a quasi-linear region. In this regime, the pulse shape evolution is dominated by linear dispersion and the spread in the eye diagrams is dominated by signal-spontaneous beat noise, much as would be the case in a linear system. However, it is necessary to carefully manage the nonlinearity in these systems to minimize timing jitter due to interpulse interactions in a single channel, as well as interchannel interactions. Thus, nonlinearity plays an important role in system design.

[IEEE ]

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