Comparison of round- and square-core fibers for sensing, imaging, and spectroscopy

Matthias C. Velsink, Zhouping Lyu, Pepijn W.H. Pinkse, Lyubov V. Amitonova*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)
64 Downloads (Pure)


Multimode fibers (MMFs) show great promise as miniature probes for sensing, imaging, and spectroscopy applications. Different parameters of the fibers, such as numerical aperture, refractive index profile and length, have been already optimized for better performance. Here we investigate the role of the core shape, in particular for wavefront shaping applications where a focus is formed at the output of the MMF. We demonstrate that in contrast to a conventional round-core MMF, a square-core design does not suffer from focus aberrations. Moreover, we find that how the interference pattern behind a square-core fiber decorrelates with the input frequency is largely independent of the input light coupling. Finally, we demonstrate that a square core shape provides an on-average uniform distribution of the output intensity, free from the input-output correlations seen in round fibers, showing great promise for imaging and spectroscopy applications.

Original languageEnglish
Pages (from-to)6523-6531
Number of pages9
JournalOptics express
Issue number5
Publication statusPublished - 1 Mar 2021


Dive into the research topics of 'Comparison of round- and square-core fibers for sensing, imaging, and spectroscopy'. Together they form a unique fingerprint.

Cite this