OSNR monitoring for RZ-DQPSK systems using half-symbol delay-tap sampling technique

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

36 Citations (Scopus)


We propose and experimentally demonstrate an asynchronous half-symbol delay-tap sampling technique for in-band optical signal-to-noise ratio (OSNR) monitoring in 38-Gb/s return-to-zero differential quadrature phase-shift-keying systems. The proposed technique enables simple analytical models for the statistics of a signal pulse which avoids system calibration prior to OSNR monitoring. A monitoring range of 1123 dB has been demonstrated experimentally. Furthermore, the proposed technique also extends the range of calibration-based OSNR monitoring techniques to 534 dB.
Original languageEnglish
Article number5443579
Pages (from-to)823-825
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number11
Publication statusPublished - 19 May 2010


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

ASJC Scopus subject areas

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


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