The coupling performance of photonic crystal fibres in fibre stellar interferometry

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atmospheric Effects, Instrumentation: Interferometers, Techniques: Interferometric

Scientific paper

Large mode area (LMA), single-mode photonic crystal fibres (PCFs) have the potential to provide significant instrumental advantages in fibre stellar interferometry, due to their broad-band attenuation spectrum, endlessly single-moded performance and very large core size. We investigate the theoretical performance of coupling the telescope point spread function directly into LMA PCFs. We find that a single LMA fibre can replace as many as three step-index fibres for atmospheric seeing characterized by DT/ro>= 2 with approximately the same coupling performance and a slower feed from the telescope. This could lead to considerable simplification of broad-band fibre interferometers.

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