NRZ-DPSK and RZ-DPSK signals signed chromatic dispersion monitoring using asynchronous delay-tap sampling

Jian Zhao, Zhaohui Li, Dawei Liu, Linghao Cheng, Chao Lu, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)


In this paper, we demonstrated a signed chromatic dispersion (CD) monitoring method of 10 GHz nonreturn-to-zero differential phase-shift keying (NRZ-DPSK) and return-to-zero differential phase-shift keying (RZ-DPSK) signals by using asynchronous delay-tap sampling and an imperfect tuned delay interferometer. This method could monitor not only the value but also the polarity of residual CD. The demodulated signals show amplitude shoulders on the rising edge or the trailing edge with CD accumulation. Delay-tap sampling scatter plots could reflect this signal distortion by a unique characteristic and realize the signed CD monitoring. The monitoring range can be up to ± and ±720 ps/nm for NRZ-DPSK and RZ-DPSK signals, respectively. Simulation and experimental results are also proposed.
Original languageEnglish
Pages (from-to)5295-5301
Number of pages7
JournalJournal of Lightwave Technology
Issue number23
Publication statusPublished - 1 Dec 2009


  • Chromatic dispersion (CD)
  • Differential phase-shift keying (DPSK)
  • Optical performance monitoring (OPM)

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this