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End effects in optical fibres

Allington-Smith, J.; Dunlop, C.; Lemke, U.; Murray, G.

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J. Allington-Smith

C. Dunlop

U. Lemke


The performance of highly multiplexed spectrographs is limited by focal ratio degradation (FRD) in the optical fibres. It has already been shown that this is caused mainly by processes concentrated around the mounting points at the ends of the fibres. We use the thickness of rings produced in the far-field when a fibre is illuminated by a collimated beam, to estimate the size of the region where the FRD is generated. This requires the development of a new model, using features of existing ray-tracing and wave-based models, which fits existing data very well. The results suggest that the amount of FRD is primarily determined by the length of fibre bonded into the supporting ferrule. We point out the implications for the production of future fibre systems.


Allington-Smith, J., Dunlop, C., Lemke, U., & Murray, G. (2013). End effects in optical fibres. Monthly Notices of the Royal Astronomical Society, 436(4), 3492-3499.

Journal Article Type Article
Acceptance Date Sep 25, 2013
Online Publication Date Oct 29, 2013
Publication Date Dec 21, 2013
Deposit Date Mar 22, 2016
Publicly Available Date Apr 22, 2016
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 436
Issue 4
Pages 3492-3499
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Published Journal Article (2.3 Mb)

Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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