The coupling performance of photonic crystal fibres in fibre stellar interferometry |
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| Authors: | J Corbett A Dabirian T Butterley N A Mortensen J R Allington-Smith |
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| Institution: | Centre for Advanced Instrumentation, Department of Physics, University of Durham, South Road, Durham DH1 3LE;Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran;NanoDTU, MIC –Department of Micro and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark |
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| Abstract: | 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 D T/ r o≥ 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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| Keywords: | atmospheric effects instrumentation: interferometers techniques: interferometric |
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