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Proceedings Paper

Studying focal ratio degradation of optical fibers for Subaru's Prime Focus Spectrograph
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Paper Abstract

Focal Ration Degradation (FRD) is a change in light’s angular distribution caused by fiber optics. FRD is important to fiber-fed, spectroscopic astronomical systems because it can cause loss of signal, degradation in spectral resolution, or increased complexity in spectrograph design. Laboratório Nacional de Astrofísica (LNA) has developed a system that can accurately and precisely measures FRD, using an absolute method that can also measure fiber throughput. This paper describes the metrology system and shows measurements of Polymicro’s fiber FBP129168190, FBP127165190 and Fujikura fiber 128170190. Although the FRD of the two fibers are low and similar to one another, it is very important to know the exact characteristics of these fibers since both will be used in the construction of FOCCoS (Fiber Optical Cable and Connectors System) for PFS (Prime Focus Spectrograph) to be installed at the Subaru telescope.

Paper Details

Date Published: 28 July 2014
PDF: 6 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 915150 (28 July 2014); doi: 10.1117/12.2056460
Show Author Affiliations
Jesulino Bispo dos Santos, Lab. Nacional de Astrofísica (Brazil)
Antonio Cesar de Oliveira, Lab. Nacional de Astrofísica (Brazil)
James Gunn, Princeton Univ. (United States)
Ligia Souza de Oliveira, Oliveira Instrumentação Óptica Ltda. (Brazil)
Marcio Vital de Arruda, Lab. Nacional de Astrofísica (Brazil)
Bruno Castilho, Lab. Nacional de Astrofísica (Brazil)
Clemens Darvin Gneiding, Lab. Nacional de Astrofísica (Brazil)
Flavio Felipe Ribeiro, Lab. Nacional de Astrofísica (Brazil)
Graham Murray, Durham Univ. (United Kingdom)
Daniel J. Reiley, Caltech Optical Observatories (United States)
Laerte Sodré Junior, Univ. de São Paulo (Brazil)
Claudia Mendes de Oliveira, Univ. de São Paulo (Brazil)

Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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