Translator Disclaimer
20 February 2007 Stable system technique for measuring the refractive index profile of an optical fiber by modified fiber-type confocal microscope method
Author Affiliations +
Abstract
Using a fiber-type confocal scanning optical microscope system, we have obtained a stable refractive index profile measurement system of good performance. We could acquire excellent index precision and good spatial resolution by using a fiber-optic system for the majority part instead of a bulk-optic system and a single mode fiber at visible region with a 4 &mgr;m core diameter instead of a pinhole structure. Also, using a power detection system that is synchronous with fiber-coupled detector, we have improved system stability by reducing noise generated by the roughness of a sample surface because of using the optical fiber as a pinhole system. The light reflected by the sample surface was divided by a beam splitter; one ray passed back through the optical fiber in order to detect a confocal point and another ray entered the synchronous power detector in order to detect reflected power. The power detected by the synchronous power detector without a pinhole is less sensitive to the surface roughness than the power detected by the fiber-coupled detector. We could implement the simple and robust index measurement system by using a fiber-optic system and a synchronous detection system, and a single mode fiber was measured to demonstrate the effectiveness of our proposed measurement system.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Seung Bum Cho, Youngchun Youk, and Dug Young Kim "Stable system technique for measuring the refractive index profile of an optical fiber by modified fiber-type confocal microscope method", Proc. SPIE 6469, Optical Components and Materials IV, 646914 (20 February 2007); https://doi.org/10.1117/12.700136
PROCEEDINGS
8 PAGES


SHARE
Advertisement
Advertisement
Back to Top