We present a method for determining the refractive-index profile of polymer optical fiber preforms through a direct-deflection measurement. The method is simple to use, compact, and has good resolution. The profile is obtained from the deflection data by numerically integrating the differential-ray equation for a radial refractive-index gradient. Corrections for topographical deviations are also discussed. Results for both graded-index and step-index fibers are presented.
© 2002 Optical Society of America
(060.2270) Fiber optics and optical communications : Fiber characterization
(120.5710) Instrumentation, measurement, and metrology : Refraction
(160.5470) Materials : Polymers
(290.3030) Scattering : Index measurements
Brian K. Canfield, Christopher S. Kwiatkowski, and Mark G. Kuzyk, "Direct deflection method for determining refractive-index profiles of polymer optical fiber preforms," Appl. Opt. 41, 3404-3411 (2002)