Transmission performance of 40 Gb/s PM duobinary signals due to fiber nonlinearities in DWDM systems using VSB filtering techniques

Hodeok Jang, Kyoungsoo Kim, Jae Hoon Lee, Jichai Jeong

Research output: Contribution to journalArticle

5 Citations (Scopus)


We investigate theoretically the tolerance of 40 Gbps phase-modulated (PM) duobinary signals using a vestigial sideband (VSB) filter on impairments which occurred in dense wavelength-division multiplexing (DWDM) systems, compared to the conventional duobinary signals. Our simulation results show that PM duobinary signals can t have the gain on the spectral efficiency ' achieved by utilizing the VSB filtering technique. In order to increase the spectral efficiency, they indispensably require to be transmitted at the optimum bandwidth of multiplexer (MUX) and demultiplexer (DEMUX) since they are susceptible to inter-channel crosstalk. It is also shown that the PM duobinary modulation format has a large tolerance on self-phase modulation (SPM) and cross-phase modulation (XPM) under the condition which MUX and DEMUX have been tuned at an optimum bandwidth; it has 1.2 dB power penalty at the fiber launching power (FLP) of 15 dBm and the channel spacing of 50 GHz.

Original languageEnglish
Pages (from-to)354-360
Number of pages7
JournalJournal of the Optical Society of Korea
Issue number3
Publication statusPublished - 2009 Dec 4



  • Duobinary signals
  • Phase-modulated duobinary
  • Vestigial sideband filtering
  • Wavelength-division multiplexing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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