Transmission performance of 10-Gb/s DPSK WDM signals due to phase-error and four-wave mixing in SOAs

Sub Hur, Jaehoon Lee, Jichai Jeong

Research output: Contribution to journalArticlepeer-review


We present a complete dynamic model of semiconductor optical amplifiers (SOAs) including the inter-channel four-wave mixing (FWM). The model has been implemented using the time-dependent transfer matrix method (TMM) and applying the discretization scheme in both the spatial and spectral domains. In SOA-based wavelength division multiplexing transmission systems using 10-Gb/s differential phase shift keyed (DPSK) signals, the system performance due to the SOA-induced phase-error and the FWM effect has been analyzed. By the injection of a reservoir channel into SOAs, the transmission performance of non-return-to-zero (NRZ) DPSK signals can be improved through the phase-error reduction. Both the NRZ-DPSK and return-to-zero (RZ) DPSK signals are found to be suffered from the FWM-induced crosstalk. The overall nonlinear tolerance of RZ-DPSK is shown to be better than that of NRZ-DPSK.

Original languageEnglish
Pages (from-to)824-829
Number of pages6
JournalOptics Communications
Issue number5
Publication statusPublished - 2009 Mar 1


  • DPSK
  • Four-wave mixing
  • Optical communication
  • Optical modulation
  • SOA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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