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Fig. 1


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Refractive (or phase) index n (solid line curve), and group index ng (dashed line curve) of silica, as a function of the wavelength λ in a vacuum. At 1.3 μm, there is no group velocity dispersion since ng is constant, i.e., dng/dλ is null. This is the basic cause; the fact that d2n/dλ2 = 0 at 1.3 μm is just a consequence of dng/dλ = −λ · d2n/dλ2.

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