Physical Optics, Diffractive Optics

Application of Fresnel diffraction to nondestructive measurement of the refractive index of optical fibers

[+] Author Affiliations
A. Sabatyan

Institute for Advanced Studies in Basic Sciences, P. O. Box 45195-1159, Zanjan, Iran, and Urmia University, Physics Department, Faculty of Sciences, P.B 165, Urmia, Iran

M. T. Tavassoly

University of Tehran, Physics Department, Kargar Shomally, Tehran, Iran

Opt. Eng. 46(12), 128001 (December 18, 2007). doi:10.1117/1.2819745
History: Received April 13, 2007; Revised July 04, 2007; Accepted July 17, 2007; Published December 18, 2007
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A nondestructive technique, based on Fresnel diffraction from phase objects, is proposed for specifying the refractive indices of optical fibers without requiring index matching liquid. The method involves measurement of normalized intensity distribution on the Fresnel diffraction pattern of a monochromatic plane wave diffracted from a fiber, and evaluation of the fiber core refractive index from the intensity distribution by the least-square method. It is also shown that for the case of an unknown fiber core radius, by fitting a suitable theoretical intensity distribution on the corresponding experimental intensity distribution, the core radius and refractive index can be obtained with reasonable accuracy. Simulation and experimental studies show that the technique is reliable and quite sensitive to refractive index change.

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© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

A. Sabatyan and M. T. Tavassoly
"Application of Fresnel diffraction to nondestructive measurement of the refractive index of optical fibers", Opt. Eng. 46(12), 128001 (December 18, 2007). ; http://dx.doi.org/10.1117/1.2819745


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