PMD-insensitive cd monitoring based on rf clock power ratio measurement with optical notch filter

Jing Yang, Changyuan Yu, Yanfu Yang, Linghao Cheng, Zhaohui Li, Chao Lu, Pak Tao Lau, Hwa Yaw Tam, Ping Kong Alexander Wai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


We propose and experimentally demonstrate a chromatic-dispersion (CD) monitoring method based on radio-frequency (RF) clock power ratio measurement in 38-Gb/s nonreturn-to-zero differential quadrature phase-shift keying (NRZ-DQPSK) and 57-Gb/s NRZ differential 8-level phase-shift keying (D8PSK) systems. A narrowband fiber Bragg grating (FBG) notch filter is centered at the optical carrier wavelength, such that the RF clock power decreases with CD. On the other hand, RF clock power increases with CD in the absence of the notch filter. By using the RF power ratio of the filtered and nonfiltered signals, polarization-mode-dispersion (PMD) effects on RF power ratio can be eliminated and CD measurement sensitivity can be increased. The CD monitoring range is 0 ∼ 250 ps/nm in the systems with a symbol rate of 19-Gsym/s. Moreover, the proposed CD-monitoring method is not affected by received optical power.
Original languageEnglish
Article number5982087
Pages (from-to)1576-1578
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number21
Publication statusPublished - 21 Oct 2011


  • Chromatic dispersion (CD)
  • optical fiber communication
  • optical performance monitoring
  • polarization-mode dispersion (PMD)

ASJC Scopus subject areas

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


Dive into the research topics of 'PMD-insensitive cd monitoring based on rf clock power ratio measurement with optical notch filter'. Together they form a unique fingerprint.

Cite this