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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 24,
  • Issue 4,
  • pp. 1689-
  • (2006)

Choice of MUX/DEMUX Filter Characteristics for NRZ, RZ, and CSRZ DWDM Systems

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Abstract

This paper investigates the influence of filter bandwidth and flank steepness of both multiplexing and demultiplexing filters in dense wavelength division multiplexed systems (spectral efficiency 0.8 b/s/Hz) in the presence of coherent wavelength division multiplexing (WDM) crosstalk. Using a recently introduced technique for the statistically reliable performance prediction of systems impaired by coherent WDM crosstalk, this paper presents numerical results for nonreturn-to-zero (NRZ), 33% duty-cycle return-to-zero (RZ), and 67% duty-cycle carrier-suppressed return-to-zero signals. This paper confirms that steep filter flanks are generally preferable, both in terms of optical signal-to-noise ratio penalty and in terms of filter bandwidth tolerance.

© 2006 IEEE

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