The fibres are used to pick off each sub field of 1" and are used to transport the light from the instrument focal plane to the two spectrographs. Each fibre has a microlens to focus the beam into the fibre at a relative fast focal ratio of F/3.65 to reduce the Focal Ratio Degradation (FRD).
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Isabelle Guinouard, Gerardo Avila, David Lee, Jean-Philippe Amans, Phil Rees, William Taylor, Ernesto Oliva, "Design, development, and performance of the fibres of MOONS," Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99125G (22 July 2016);