21 April 2008 Group dispersion measurement of a holey fiber by white-light spectral interferometry
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Abstract
We present a white-light interferometric method for measuring the wavelength dependence of the group index of a pure silica holey fiber. The method is based on the recording of a series of the spectral interferograms in a Mach-Zehnder interferometer with the fiber of known length placed in one of the interferometer arms and the other arm with adjustable path length. We measure the equalization wavelength as a function of the path length difference, or equivalently the group index dispersion. Subtracting the group dispersion of the optical components present in the interferometer along with the fiber, first we measure the wavelength dependence of the differential group index of the pure silica glass provided that that the light is guided by the outer cladding of the fiber. Second, we measure the wavelength dependence of the group effective index of the fundamental mode supported by the fiber provided that some of the recorded interferograms are also due to the mode.
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Petr Hlubina, Dalibor Ciprian, and Radek Chlebus "Group dispersion measurement of a holey fiber by white-light spectral interferometry", Proc. SPIE 6990, Photonic Crystal Fibers II, 69900J (21 April 2008); doi: 10.1117/12.779723; https://doi.org/10.1117/12.779723
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