2010
DOI: 10.1111/j.1365-2966.2010.16391.x
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The dependence of the properties of optical fibres on length

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 and Parry \cite{Carrasco1994} to quantify the 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 d… Show more

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Cited by 16 publications
(20 citation statements)
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“…Modern fibre designed for use in astronomical instrumentation has very few perturbations over long fibre lengths and therefore has a very weak FRD length dependency. The fibre end‐face preparation and external environment are likely to have a bigger impact on FRD than the fibre length; this supports the current literature (Poppett & Allington‐Smith 2010).…”
Section: Resultssupporting
confidence: 89%
“…Modern fibre designed for use in astronomical instrumentation has very few perturbations over long fibre lengths and therefore has a very weak FRD length dependency. The fibre end‐face preparation and external environment are likely to have a bigger impact on FRD than the fibre length; this supports the current literature (Poppett & Allington‐Smith 2010).…”
Section: Resultssupporting
confidence: 89%
“…It is not straightforward to decide whether to base the model prediction on input focal ratio, output focal ratio or a mixture of both, because part of the FRD could occur at the each of the fibre endfaces (compare length effect, Poppett & Allington‐Smith (2010)), leading to a complex mode‐population dependence along the fibre. We chose modal noise to be a function of θ in as this seems to fit the coherent model best.…”
Section: Resultsmentioning
confidence: 99%
“…For instance it was shown by Baudrand & Walker (2001); Corbett (2006), that the SNR has no significant dependence on fibre length for L ≤ 100 m. This is possibly because the fibre does not terminate with a perfect quartz‐air intersection. This so called end‐effect (Poppett & Allington‐Smith 2010) may lead to a stronger mode mixing and thus less coherence between the modes, which would explain the diminished visibility. In the following L will therefore be treated as a free parameter.…”
Section: Theoretical Predictionsmentioning
confidence: 99%
“…Consequently considerable effort has been expended in identifying and mitigating the various causes of FRD in fibre fed instruments (e.g. [2,3]), however the issue of fibre core geometry is a relatively unexplored area.…”
Section: Focal Ratio Degradationmentioning
confidence: 99%