Using ultrafast laser inscription, we report the fabrication of a prototype three-dimensional 121-waveguide fan-out device capable of reformatting the output of a 120-core multicore fiber (MCF) into a one-dimensional linear array. When used in conjunction with an actual MCF, we demonstrate that the reformatting function using this prototype would result in an overall through put loss of ˜7.0??dB. However, if perfect coupling from the MCF into the fan-out could be achieved, the reformatting function would result in an overall loss of only ˜1.7??dB. With adequate development, similar devices could efficiently reformat the output of so-called “photonic lanterns” fabricated using highly multicore fibers.
Thomson, R., Harris, R., Birks, T., Brown, G., Allington-Smith, J. R., & Bland-Hawthorn, J. (2012). Ultrafast laser inscription of a 121-waveguide fan-out for astrophotonics. Optics Letters, 37(12), 2331-2333. https://doi.org/10.1364/OL.37.002331