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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El-Hennawi, H.A., El-Diasty, F., El-Ghandoor, H. et al. Multiple-beam interference fringes applied to investigate the index profile of the optical fiber dip. Opt Quant Electron 43, 35–48 (2012). https://doi.org/10.1007/s11082-011-9501-8
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DOI: https://doi.org/10.1007/s11082-011-9501-8