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Proceedings Paper

Stable system technique for measuring the refractive index profile of an optical fiber by modified fiber-type confocal microscope method
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Paper 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.

Paper Details

Date Published: 20 February 2007
PDF: 8 pages
Proc. SPIE 6469, Optical Components and Materials IV, 646914 (20 February 2007); doi: 10.1117/12.700136
Show Author Affiliations
Seung Bum Cho, Gwangju Institute of Science and Technology (South Korea)
Youngchun Youk, Gwangju Institute of Science and Technology (South Korea)
Dug Young Kim, Gwangju Institute of Science and Technology (South Korea)

Published in SPIE Proceedings Vol. 6469:
Optical Components and Materials IV
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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