In-service chromatic dispersion monitoring based on imperfect phase tuned delay interferometer for NRZ-DPSK systems

Jian Zhao, Zhaohui Li, K. K. Qureshi, Pak Tao Lau, Chao Lu, Hwa Yaw Tam

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


Differential phase-shift keying (DPSK) modulation format has been widely employed in high speed long haul transmission systems. The DPSK modulation format is a promising technique to increase the system performance, for example: extending the transmission distance, reducing the OSNR requirement and suppressing the nonlinearity. So the optical signal performance monitoring is quite necessary and indispensible for this modulation format. In this paper, a chromatic dispersion (CD) monitoring method for DPSK signals has been demonstrated using an optical delay interferometer with imperfect phase adjustment. We found the eye diagrams shown inclination with the combination effect of phase error and residual CD. This method can not only be used for CD monitoring but also can discriminate dispersion polarity. The CD monitoring range could cover from -425 to +425ps/nm of 10 GHz NRZ-DPSK system.
Original languageEnglish
Title of host publicationOptical Transmission Systems, Switching, and Subsystems VII
Publication statusPublished - 1 Dec 2009
EventOptical Transmission Systems, Switching, and Subsystems VII - Shanghai, China
Duration: 2 Nov 20096 Nov 2009


ConferenceOptical Transmission Systems, Switching, and Subsystems VII


  • Chromatic dispersion
  • Differential phase-shift keying
  • Optical fiber communication
  • Optical performance monitoring

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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