Investigation of transmission performance of 40-Gb/s conventional DCS-RZ signals and DCS-RZ signals generated from phase-modulated duobinary signals

Yonghoon Kim, Hodeok Jang, Sub Hur, Tae Won Oh, Young Sik Kim, Jichai Jeong

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4 Citations (Scopus)


A 40-Gb/s duobinary carrier-suppressed return-to-zero (DCS-RZ) signal format generated from phase-modulated (PM) duobinary signals by using a phase modulator and an external intensity modulator is proposed. The transmission performance of the proposed DCS-RZ format is theoretically investigated. The proposed DCS-RZ format can produce a signal bandwidth similar to that produced by the conventional DCS-RZ format generated from conventional duobinary signals using lowpass filters. However, the receiver sensitivities of the proposed DCS-RZ format can be improved by about 2 dB more than those of the conventional DCS-RZ format due to high extinction ratio and nonlinear tolerance. Due to a short pulse of the proposed DCS-RZ format, the tolerance of the first-order polarization mode dispersion (PMD) for the format can be improved by about 1 dB up to the differential-group-delay (DGD) value of 16 ps.

Original languageEnglish
Pages (from-to)3370-3375
Number of pages6
JournalJournal of Lightwave Technology
Issue number9
Publication statusPublished - 2006 Sep



  • Duobinary
  • Modulation format
  • Optical comniunication
  • Simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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