Competence Center for Specialty Optical Fibers

This study presents what we believe to be a novel 37-core multicore fiber designed for the visible range (565 nm … 650 nm), featuring a hexagonal arrangement of identical cores, single-mode guidance, low intercore crosstalk, low-mode attenuation (< 0.1 dB/m), and high-core density (1.2 × 10−3). Experimental characterizations, including intercore coupling, mode attenuation, core positioning accuracy (<120 nm), bending loss, group velocity dispersion, and mode field diameter, combined with supermode dispersion simulations, uncover the fiber performance. These results highlight the potential of visible-wavelength multicore fibers for advancing high-resolution imaging, optical trapping, and minimally invasive diagnostics.