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Focal Ration Degradation (FRD) is a change in light angular distributioncaused by fiber optics. FRD is important to fiber-fed, spectroscopicastronomical systems because it can cause loss of signal, degradation inspectral resolution, or increased complexity in spectrograph design.Laborat\'orio Nacional de Astrof\'isica (LNA) has developed a system that canaccurately and precisely measures FRD, using an absolute method that can alsomeasure fiber throughput. This paper describes the metrology system and showsmeasurements of Polymicro fiber FBP129168190, FBP127165190 and Fujikura fiber128170190. Although the FRD of the two fibers are low and similar to oneanother, it is very important to know the exact characteristics of these fiberssince both will be used in the construction of FOCCoS (Fiber Optical Cable andConnectors System) for PFS (Prime Focus Spectrograph) to be installed at theSubaru telescope.

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