Performance limits of 10-Gb/s optical duobinary transmissions using reduced bandwidth single-arm Mach-Zehnder modulators considering residual chirp and dc-bias offset

Shinhee Won, Jae Hoon Lee, Yonghoon Kim, Seongha Kim, Jichai Jeong

Research output: Contribution to journalArticle

7 Citations (Scopus)


We investigate the performance limits and the impact on the system margin of 10-Gb/s duobinary modulations due to reducing the bandwidths of single-arm Mach-Zehnder (MZ) modulators in a 10-Gb/s duobinary transmitter through numerical simulation. In addition to that, the individual and combined effects of dc-bias offset ratio to switching voltage and residual chirp due to the asymmetry of modulators on the system performance have been studied using reduced bandwidth single-arm MZ modulators. Our results suggest that with a single-arm MZ modulator of bandwidth reduced to 5 GHz and a duobinary filter of 2.6-GHz bandwidth, the sensitivity penalty can be maintained within 2 dB over a 200-km span of uncompensated single-mode fiber referred to that at 0 km of ideal duobinary transmitters. In this case, the allowable range of the residual-chirp parameter is to be from -0.1 to +0.1 with dc-bias offset ratio of less than ±2.5%.

Original languageEnglish
Pages (from-to)479-481
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number3
Publication statusPublished - 2003 Mar 1



  • Duobinary modulation
  • Modulation format
  • Optical communication
  • Optical transmitter
  • Simulation
  • Single-arm Mach-Zehnder (MZ) modulator
  • System analysis and design

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)
  • Atomic and Molecular Physics, and Optics

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