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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 1.55 μm, the slope of the tangent to the curve n(λ), i.e., dn/dλ or n′(λ), equates minus 0.012 μm−1, and gives the chromatic, or first-order, dispersion; the one to the curve ng(λ), i.e., dng/dλ or n′g(λ), equates plus 0.007 μm−1, and gives the group velocity dispersion, or second-order dispersion. Since 1/c = 1 ns/300 mm, the dispersion parameter D(1.55 μm) = (1/c) · n′g(1.55 μm) equates + 23 ps/(nm km).
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