Dispersion-monitoring in WDM systems by injecting modulated ASE

Graeme J. Pendock, Xingwen Yi, Changyuan Yu, William Shieh

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)


We demonstrate a technique for measuring the residual dispersion in wavelength-division-multiplexing links by injecting a low level of broadband amplified spontaneous emission that has been modulated with a radio-frequency (RF) tone into the start of the link to be monitored. The residual dispersion at the end of the link is then determined by measuring the RF phase shifts in this tone across different wavelengths. A benefit of this technique is that it does not require integration into the channel transponder and is not constrained to monitoring a fixed wavelength, but instead can be implemented as an independent unit capable of monitoring the link across the band irrespective of channel presence.
Original languageEnglish
Pages (from-to)821-823
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number10
Publication statusPublished - 15 May 2008
Externally publishedYes


  • Monitoring
  • Optical fiber communication
  • Optical fiber dispersion
  • Optical fiber measurements
  • Optical noise

ASJC Scopus subject areas

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


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