2017
DOI: 10.1093/mnras/stw3137
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A modified method for determining the focal ratio degradation and length properties of optical fibres in astronomy

Abstract: Focal ratio degradation (FRD) is a major contributor to throughput and light loss in a fibre spectroscopic telescope system. We combine the guided mode theory in geometric optics and a well-known model, power distribution model (PDM), to predict and explain the FRD dependence properties. We present a robust method by modifying the energy distribution method (EDM) with f-intercept to control the input condition. This method provides a way to determine the proper position of the fibre end on the focal plane to i… Show more

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Cited by 8 publications
(5 citation statements)
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“…Based on geometrical optics, 2α F should be the minimum possible ring width, labeled "no FRD" in Figure 11. The results show a quite stable ring width for the cores of both fibers according to Carrasco [16], but a generally decreasing ring width with increasing α S for the light-guiding layers 2 and 4 in both fibers according to Yan [4]. Correlation to the very different core diameters is weak in this data.…”
Section: Selective Angular Excitationmentioning
confidence: 60%
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“…Based on geometrical optics, 2α F should be the minimum possible ring width, labeled "no FRD" in Figure 11. The results show a quite stable ring width for the cores of both fibers according to Carrasco [16], but a generally decreasing ring width with increasing α S for the light-guiding layers 2 and 4 in both fibers according to Yan [4]. Correlation to the very different core diameters is weak in this data.…”
Section: Selective Angular Excitationmentioning
confidence: 60%
“…In addition, this model [16] showed a dependence of the FRD-Parameter D~1 (core diameter) 2 ⁄ . Contrary to that, Yan [4] showed experimental data with decreasing ring width at incident angles between 49 mrad and 167 mrad. To compare these models with our results, Figure 11 shows the ring width β0 - βi and 2α F = 28 mrad for comparison for all investigated light-guiding layers.…”
Section: Selective Angular Excitationmentioning
confidence: 76%
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“…In such case, both meridional (preferably due to the cone shown in yellow color) as well as skew (outside the yellow colored cone) rays contribute and the resulting output at the fiber‐exit is of circular shaped with almost uniformly illuminated everywhere. Furthermore, in case of an angulated focusing (shown in Figure C), the contribution of meridional rays rapidly decreases and most of the light is guided through the skew rays which results in an annular or ring‐shaped beam at the fiber‐exit .…”
Section: Methodsmentioning
confidence: 99%