It seems there are two issues:
1: the magnitude
2: the mode profile.
In EME, we normalize the fields to have power of 1Watt. So no worry about its values.
For the mode profile, as you know, Lumerical uses rectilinear meshing. Mostly the other tool uses finite element meshing. So before importing the fields, please view the dataset and make sure it does not change the field profile after interpolation.
If you only have E-fields, EME will recalculate the H-fields from discrete Maxwell Equations.
So before importing make sure the dataset gives the correct profile.
BTW: in almost all the cases EME should be able to calculate the source mode by its self. You may also try to calculate the modes inside EME to avoid importing.
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