Characterization of modes excited in nonlinear photonic crystal fibre using low coherence interferometry

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding


We have excited both LP01 and LP11 modes using a high magnification objective lens (60×) in a nonlinear photonic crystal fibre (PCF) of core diameter 2.2μm and simultaneously detected the modes using low coherence interferometry. We placed the nonlinear PCF of length ∼11cm in one arm of an interferometer, and then interfered the output with light in the reference arm onto a photodetector via a single mode collection fibre positioned at a point in a near-field image of the fibre endface. More than one fringe packet was observed in the interferogram, indicating the presence of two modes propagating in the fibre core. To uniquely identify the dispersion curves we need to know which mode corresponds to each fringe packet in the interferogram. In the same experimental setup we replaced the photodetector with a digital CCD camera to record the 2-D interference pattern across the image as function of group delay. A Fourier analysis technique was used to compute the intensity and phase of the mode field patterns corresponding to the various interferograms. Using this technique we can simultaneously measure the group velocity dispersion and the mode profile with phase information of the modes excited in a multimode PCF.

Original languageEnglish
Title of host publicationPhotonic Crystal Fibers III
ISBN (Print)9780819476319
Publication statusPublished - 19 May 2009
EventPhotonic Crystal Fibers III - Prague, Czech Republic
Duration: 22 Apr 200923 Apr 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferencePhotonic Crystal Fibers III
Country/TerritoryCzech Republic


  • Dispersion measurement
  • Fibre characterization

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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