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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 9 — Apr. 28, 2008
  • pp: 5974–5982

Constellation diagram analysis of DPSK signal regeneration in a saturated parametric amplifier

Mats Sköld, Jiang Yang, Henrik Sunnerud, Magnus Karlsson, Shoichiro Oda, and Peter A. Andrekson  »View Author Affiliations

Optics Express, Vol. 16, Issue 9, pp. 5974-5982 (2008)

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The regeneration of 10 Gbit/s differential phase shift keying (DPSK) signals in a saturated fiber optic parametric amplifier (FOPA) acting as an optical intensity regenerator is investigated. The regeneration properties are investigated in amplitude and phase separately by means of coherent detection and constellation diagram analysis. A significant reduction of the amplitude fluctuations is observed and the measured signal-to-noise ratio (SNR) after DPSK demodulation is increased up to 10 dB. However, from the constellation analysis it is found that the FOPA introduces phase noise to the signal. The FOPA induced phase noise originates from pump amplitude fluctuations that are transferred to the signal through cross-phase modulation.

© 2008 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.5060) Fiber optics and optical communications : Phase modulation
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: January 11, 2008
Revised Manuscript: April 4, 2008
Manuscript Accepted: April 7, 2008
Published: April 14, 2008

Mats Sköld, Jiang Yang, Henrik Sunnerud, Magnus Karlsson, Shoichiro Oda, and Peter A. Andrekson, "Constellation diagram analysis of DPSK signal regeneration in a saturated parametric amplifier," Opt. Express 16, 5974-5982 (2008)

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