Claire Poppett
The dependence of the properties of optical fibres on length
Poppett, Claire; Allington-Smith, Jeremy
Authors
Jeremy Allington-Smith
Abstract
We investigate the dependence on length of optical fibres used in astronomy, especially the focal ratio degradation (FRD) which places constraints on the performance of fibre-fed spectrographs used for multiplexed spectroscopy. To this end, we present a modified version of the FRD model proposed by Carrasco & Parry to quantify the number of scattering defects within an optical fibre using a single parameter. The model predicts many trends which are seen experimentally, for example, a decrease in FRD as core diameter increases, and also as wavelength increases. However, the model also predicts a strong dependence on FRD with length that is not seen experimentally. By adapting the single fibre model to include a second fibre, we can quantify the amount of FRD due to stress caused by the method of termination. By fitting the model to experimental data, we find that polishing the fibre causes more stress to be induced in the end of the fibre compared to a simple cleave technique. We estimate that the number of scattering defects caused by polishing is approximately double that produced by cleaving. By placing limits on the end effect, the model can be used to estimate the residual-length dependence in very long fibres, such as those required for Extremely Large Telescopes, without having to carry out costly experiments. We also use our data to compare different methods of fibre termination.
Citation
Poppett, C., & Allington-Smith, J. (2010). The dependence of the properties of optical fibres on length. Monthly Notices of the Royal Astronomical Society, 404(3), 1349-1354. https://doi.org/10.1111/j.1365-2966.2010.16391.x
Journal Article Type | Article |
---|---|
Publication Date | May 21, 2010 |
Deposit Date | Nov 10, 2011 |
Publicly Available Date | Nov 10, 2015 |
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 | 404 |
Issue | 3 |
Pages | 1349-1354 |
DOI | https://doi.org/10.1111/j.1365-2966.2010.16391.x |
Keywords | Instrumentation: spectrographs, Techniques: spectroscopic, Methods: laboratory. |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2010 The Authors. Journal compilation © 2010 RAS Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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