Comparison of transmission performance of 40-Gb/s optical duobinary and DCS-RZ signals using 10- and 40-Gb/s LiNbO3 Mach-Zehnder modulators

Yonghoon Kim, Hodeok Jang, Sangil Kim, Seunghyun Oh, Jaehoon Lee, Kyoungsoo Kim, Hanlim Lee, Jichai Jeong

Research output: Contribution to journalArticle

6 Citations (Scopus)


We investigated a cost-effective method using 10-Gb/s LiNbO3 Mach-Zehnder Modulators (MZMs) for transmitting 40-Gb/s duobinary nonreturn-to-zero (NRZ) and duobinary carrier-suppressed return-to-zero (DCS-RZ) signals. The transmission performance of the signals was investigated. The optimum bandwidths of low-pass filters in transmitters using 10- and 40-Gb/s LiNbO3 MZMs were also investigated. The calculated transmission performance of the transmitter using 10-Gb/s LiNbO3 MZMs was compared to that using 40-Gb/s LiNbO3 MZMs. The effect of the bias offset in the transmitters was investigated. Compared to duobinary-NRZ and DCS-RZ signals generated by a transmitter using 40-Gb/s LiNbO3 MZMs, those generated by using 10-Gb/s LiNbO3 MZMs can be transmitted with 1-dB power penalty over 480-km transmission.

Original languageEnglish
Pages (from-to)318-324
Number of pages7
JournalJournal of Lightwave Technology
Issue number1
Publication statusPublished - 2007 Jan 1



  • Duobinary
  • Modulation format
  • Optical communication
  • Simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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