Untangled modes in multimode waveguides

Martin Plöschner, Tomáš Tyc, Tomáš Čižmár*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review


Small, fibre-based endoscopes have already improved our ability to image deep within the human body. A novel approach introduced recently utilised disordered light within a standard multimode optical fibre for lensless imaging. Importantly, this approach brought very significant reduction of the instruments footprint to dimensions below 100 μm. The most important limitations of this exciting technology is the lack of bending flexibility - imaging is only possible as long as the fibre remains stationary. The only route to allow flexibility of such endoscopes is in trading-in all the knowledge about the optical system we have, particularly the cylindrical symmetry of refractive index distribution. In perfect straight step-index cylindrical waveguides we can find optical modes that do not change their spatial distribution as they propagate through. In this paper we present a theoretical background that provides description of such modes in more realistic model of real-life step-index multimode fibre taking into account common deviations in distribution of the refractive index from its ideal step-index profile. Separately, we discuss how to include the influence of fibre bending.

Original languageEnglish
Title of host publicationComplex Light and Optical Forces X
EditorsJesper Glückstad, David L. Andrews, Enrique J. Galvez
Place of PublicationBellingham WA
Number of pages6
ISBN (Electronic)9781628419993
Publication statusPublished - 2016
Externally publishedYes
Event10th Conference on Complex Light and Optical Forces - San Francisco, United States
Duration: 16 Feb 201618 Feb 2016

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X


Other10th Conference on Complex Light and Optical Forces
Country/TerritoryUnited States
CitySan Francisco


  • Digital holography
  • Endoscopy
  • Fibre optics
  • Optical modes


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