Statistical analysis of optical signal-to-noise ratio monitoring using delay-tap sampling

F. N. Khan, Pak Tao Lau, Zhaohui Li, Chao Lu, Ping Kong Alexander Wai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)


We derive analytical expressions for the optical signal-to-noise ratio (OSNR) monitoring using delay-tap sampling for intensity-modulated direct-detection (IM/DD) systems. We demonstrate through our theoretical analysis and experimental results that modeling of noise correlation due to low-pass filtering between delay-tap samples enables accurate monitoring of OSNR, without recalibration for each system setup. Effects of chromatic dispersion (CD) and polarization-mode dispersion on the proposed technique are investigated through numerical simulations. The monitoring error remains within 1 dB for CD up to 400 ps/nm and differential group delay up to 45 ps.
Original languageEnglish
Article number5342488
Pages (from-to)149-151
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number3
Publication statusPublished - 1 Feb 2010


  • Delay-tap sampling
  • Optical performance monitoring
  • Optical signal-to-noise ratio (OSNR) monitoring
  • Q-factor monitoring

ASJC Scopus subject areas

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

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