the quantity which characterizes that part of profile dispersion due to a variation of refractive index contrast with wavelength given by:
where
n1 is the maximum refractive index of the core,
N1 is the group index corresponding to n1 calculated from the formula:
N1 = n1 = λ (dn1 / dλ)
Δ is the refractive index contrast,
λ is the wavelength in vacuum
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