Skip to main content

Research Repository

Advanced Search

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

dos Santos, J.B.; de Oliveira, A.C.; Gunn, J.; de Oliveira, L.S.; Vital de Arruda, M.; Castilho, B.; Gneiding, C.D.; Ribeiro, F.F.; Murray, G.; Reiley, D.J.; Sodré Junior, L.; de Oliveira, C.M.


J.B. dos Santos

A.C. de Oliveira

J. Gunn

L.S. de Oliveira

M. Vital de Arruda

B. Castilho

C.D. Gneiding

F.F. Ribeiro

D.J. Reiley

L. Sodré Junior

C.M. de Oliveira


Ramon Navarro

Colin R. Cunningham

Alison A. Barto


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. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Presentation Conference Type Conference Paper (Published)
Conference Name Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Online Publication Date Jul 28, 2014
Publication Date 2014-07
Deposit Date Mar 22, 2016
Publisher SPIE
Volume 9151
Series Title Proceedings of SPIE
Series ISSN 0277-786X
Book Title Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
ISBN 9780819496195
Public URL