Power profile optimization in phase-modulated systems in presence of nonlinear phase noise

Pak Tao Lau, Joseph M. Kahn

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


In optical fiber transmission systems using inline amplifiers, the interaction of signal and amplifier noise through the Kerr effect leads to nonlinear (NL) phase noise that impairs detection of phase-modulated signals. We study the minimization of the total phase noise variance (linear, NL, and receiver) by using a power profile along the link that is linear (on a decibel scale) with distance. For DPSK systems with direct detection, a total variance reduction of 65% can be achieved by designing the transmitted power to be about 8 dB higher than the received power in typical terrestrial links. In addition, for a given transmitted power and received power, the optimal power profile along the link is numerically determined.
Original languageEnglish
Pages (from-to)2514-2516
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number23
Publication statusPublished - 1 Dec 2006
Externally publishedYes


  • Optical fiber amplifier
  • Optical Keer effect
  • Phase noise

ASJC Scopus subject areas

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

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