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Material dispersion in a step index fiber is given by:
Dispersion = -(length/c)*((DELTA_wavelength)/wavelength)*(2nd derivitive of n1 wrt wavelength)
c = speed of light
DELTA_wavelength/wavelength is usually given as a percentage
2nd derivitive of n1 wrt wavelength can be found using a graph.
Since n1 is a function of the fiber you're using you must obtain a graph of dispersion for that particular material. I have a graph for glass silica. Let me know if you need it.
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