Abstract

Multiple-beam Fizeau fringes revealed the existence of successive layers forming a graded-index fiber core. Both thickness and approximate refractive index graded from one layer to another have been estimated. The fiber is found to be formed from a succession of step-index layers, n(r), which remains constant over the thickness Δr, yet follows the known function relating n(r) with r in terms of n(r = 0) and α. The index profile for graded-index fibers showing such structure is presented theoretically and veried experimentally from microinterferograms.

© 1988 Optical Society of America

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