WDM transmission performance evaluation for externally modulated coding formats

Hadj Bourdoucen, Ahmed Al Naamany

Research output: Contribution to journalArticlepeer-review


Performance evaluation of WDM transmission systems for external electrooptic modulated codes is considered. This has been done for two popular line codes which are return-to-zero (RZ) and nonreturn-to-zero (NRZ) formats operating at bit rates of 10 and 40 Gbps. The optical channel consisting of a standard single mode fiber was compensated for chromatic dispersion at 1550 nm by a dispersion compensation fiber. Signal attenuation occurring in both fibers has been compensated by adequate optical amplifiers. Performance of considered systems has been evaluated via the analysis of quality factor profiles. Numerical simulations reveal that external modulation using Mach-Zehnder devices affects more RZ coded systems than NRZ coded ones. This is for the case where the average power and data bit rates are the same for the two codes. The overall results show a net superiority of NRZ modulation scheme over RZ scheme for different fiber spans at various data bit rates.

Original languageEnglish
Pages (from-to)144-149
Number of pages6
JournalJournal of Electrical Engineering
Issue number4
Publication statusPublished - 2013


  • MZM
  • Mach-Zehnder
  • NRZ
  • Optical modulator
  • RZ
  • WDM

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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