Transmission performance of 10-Gb/s optical duobinary transmission systems considering adjustable chirp of nonideal LiNbO3 mach-zehnder modulators due to applied voltage ratio and filter bandwidth

Sung Kee Kim, Jae Hoon Lee, Jichai Jeong

Research output: Contribution to journalArticle

22 Citations (Scopus)


We investigate interplay between the residual and applied chirp of optical duobinary modulated signals in order to improve transmission performance. To find the best performance for 10-Gb/s optical duobinary transmission systems, we consider the residual chirp accompanying from the finite extinction ratio, the applied chirp adjusted by the applied voltage ratio (the chirp parameter) between two electrodes of LiNbO3 modulators, and the bandwidth of electrical low-pass filters used in duobinary transmitters. The simulation results suggest that nearly zero chirp during the mark ('1') period and large peak chirp at the middle of the space ('0') provide the best transmission performance. This zero chirp around marks and high peak chirp at the middle of each space can be controlled by the applied voltage ratio between two electrodes of modulator and the filter bandwidth, respectively.

Original languageEnglish
Pages (from-to)465-470
Number of pages6
JournalJournal of Lightwave Technology
Issue number4
Publication statusPublished - 2001 Apr 1



  • Chirp modulation
  • Duobinary modulation
  • Optical communication
  • Propagating in dispersive media

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

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