Multiple-beam interference fringes applied to investigate the index profile of the optical fiber dip |
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Authors: | H A El-Hennawi Fouad El-Diasty H El-Ghandoor Mona A Soliman |
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Institution: | 1. Department of Physics, Faculty of Science, Ain Shams University, Abbassia, Cairo, 11566, Egypt
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Abstract: | A numerical-based phase shift method is presented to study optical fibers having a dip in the refractive index profile at the center of the core. Mathematical expressions for the shape of multiple-beam Fizeau fringes crossing a graded-index optical fiber (GRIN) comprising a central graded-index dip or GRIN fiber with a constant refractive index dip, immersed in a silvered liquid wedge, are derived. The index profile parameters of the central dip are determined by comparing the theoretical fringe shape across the fiber cross-section and the experimental fringe shape obtained from micro-interferograms of the wedge interferometer. |
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