Ultrafast laser inscription of a 121-waveguide fan-out for astrophotonics

  • Thomson R
  • Harris R
  • Birks T
 et al. 
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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.

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  • Robert R. Thomson

  • R. J. Harris

  • Tim A. Birks

  • G. Brown

  • J. Allington-Smith

  • Joss Bland-Hawthorn

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