Abstract

Methods which have proved to be useful for measuring core–cladding refractive-index differences, for approximating refractive-index profiles, and for viewing various inhomogeneities in solid multimode optical fibers are described. Optical, transmission-interference,and scanning-electron-beam microscopy have been used, and the illustrations include examples of photomicrographs made by each of these techniques.

© 1974 Optical Society of America

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