In-service signal quality monitoring and multi-impairment discrimination based on asynchronous amplitude histogram evaluation for NRZ-DPSK systems

Zhihong Li, Chao Lu, Yixin Wang, Guifang Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)


A novel in-service signal quality monitoring technique for nonreturn-to-zero differential phase-shift keying signals using asynchronous amplitude histogram evaluation has been demonstrated. As a result of phase-to-amplitude modulation, there are three Gaussian distributions in the amplitude histogram. The widths of the Gaussian distributions are related to the amount of amplified spontaneous emission, while the separations between the Gaussian distributions increase monotonically with fiber dispersion. The amount of dispersion and optical signal-to-noise ratio can, thus, be directly extracted and discriminated from the amplitude histogram.
Original languageEnglish
Pages (from-to)1998-2000
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number9
Publication statusPublished - 1 Sep 2005
Externally publishedYes


  • Asynchronous sampling
  • Optical performance monitoring
  • Q-factor estimation

ASJC Scopus subject areas

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

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