Extended depth of field imaging through multicore optical fibers

Antony Orth*, Martin Ploschner, Ivan S. Maksymov, Brant C. Gibson

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Compact microendoscopes use multicore optical fibers (MOFs) to visualize hard-to-reach regions of the body. These devices typically have a large numerical aperture (NA) and are fixed-focus, leading to blurry images from a shallow depth of field with little focus control. In this work, we demonstrate a method to digitally adjust the collection aperture and therefore extend the depth of field of lensless MOF imaging probes. We show that the depth of field can be more than doubled for certain spatial frequencies, and observe a resolution enhancement of up to 78% at a distance of 50μm from the MOF facet. Our technique enables imaging of complex 3D objects at a comparable working distance to lensed MOFs, but without the requirement of lenses, scan units or transmission matrix calibration. Our approach is implemented in post processing and may be used to improve contrast in any microendoscopic probe utilizing a MOF and incoherent light.

Original languageEnglish
Pages (from-to)6407-6419
Number of pages13
JournalOptics Express
Volume26
Issue number5
DOIs
Publication statusPublished - 5 Mar 2018

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    Orth, A., Ploschner, M., Maksymov, I. S., & Gibson, B. C. (2018). Extended depth of field imaging through multicore optical fibers. Optics Express, 26(5), 6407-6419. https://doi.org/10.1364/OE.26.006407