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All-fiber few-mode optical coherence tomography using a modally-specific photonic lantern

Biomedical Optics Express, ISSN: 2156-7085, Vol: 12, Issue: 9, Page: 5704-5719
2021
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Article Description

Optical coherence tomography (OCT) was recently performed using a few-mode (FM) fiber to increase contrast or improve resolution using a sequential time-domain demultiplexing scheme isolating the different interferometric signals of the mode-coupled backscattered light. Here, we present an all-fiber FM-OCT system based on a parallel modal demultiplexing scheme exploiting a novel modally-specific photonic lantern (MSPL). The MSPL allows for maximal fringe visibility for each fiber propagation mode in an all-fiber assembly which provides the robustness required for clinical applications. The custom-built MSPL was designed for OCT at 930 nm and is wavelength-independent over the broad OCT spectrum. We further present a comprehensive coupling model for the interpretation of FM-OCT images using the first two propagation modes of a few-mode fiber, validate its predictions, and demonstrate the technique using in vitro microbead phantoms and ex vivo biological samples.

Bibliographic Details

de Sivry-Houle, Martin Poinsinet; Beaudoin, Simon Bolduc; Brais-Brunet, Simon; Dehaes, Mathieu; Godbout, Nicolas; Boudoux, Caroline

Optica Publishing Group

Biochemistry, Genetics and Molecular Biology; Physics and Astronomy

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