I have simulated a photonic crystal fiber by Lumerical mode-sloution. the substrate is SiO2 with air-holes along it. I have added SiO2 in material by defining its sellmeier coefficients. All the extracted results are acceptable except Dispersion!

With finest changing in mesh geometry or mesh steps, dispersion changes dramatically. is there any specific setting or rule to extract an exact and stable dispersion curve vs. wavelength in Limerical mode-solution. please help me

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