RZ versus NRZ in nonlinear WDM systems

Fabrizio Forghieri, P. R. Prucnal, R. W. Tkach, A. R. Chraplyvy

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


The issue of what is the best duty cycle in an intensity-modulated direct-detection optical system keeps resurfacing. Here, this issue is addressed from a transmission point of view for a wavelength-division-multiplexed (WDM) system. It is shown that nonreturn-to-zero (NRZ) is more robust to optical fiber transmission impairments for both already deployed systems and new systems in which the dispersion map is a design parameter.

Original languageEnglish (US)
Pages (from-to)1035-1037
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number7
StatePublished - Jul 1997

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


  • Optical fiber communication
  • Optical fiber nonlinearities
  • Optical modulation/demodulation
  • Wavelength-division multiplexing


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