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

Seung Bum Cho; Youngchun Youk; Dug Young Kim

doi:10.1117/12.700136

20 February 2007 Stable system technique for measuring the refractive index profile of an optical fiber by modified fiber-type confocal microscope method

Seung Bum Cho, Youngchun Youk, Dug Young Kim

Author Affiliations +

Proceedings Volume 6469, Optical Components and Materials IV; 646914 (2007) https://doi.org/10.1117/12.700136
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

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.

Citation Download Citation

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

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