I am using SWG based MMI.Â Can i use EME? I used FDTD for that. Can i use the same s parameter extraction for FDTD? Also, i did an s parameter sweep in FDTD and saved the sparameter value in lumerical format and exported it to the interconnect i got this error:

SPAR_1: Fitting for '256' coefficients...

SPAR_1: Error in fit is '0.00109188'.

SPAR_1: Calculating filter coefficients at '1.931e+14' Hz ...

SPAR_1: Fitting for '256' coefficients...

SPAR_1: Error in fit is '0.00171933'.

SPAR_1: Calculating filter coefficients at '1.931e+14' Hz ...

SPAR_1: Fitting for '256' coefficients...

SPAR_1: Error in fit is '0.0020334'.

SPAR_1: Calculating filter coefficients at '1.931e+14' Hz ...

SPAR_1: Fitting for '256' coefficients...

SPAR_1: Error in fit is '0.00203526'.

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Is it because i did not use the right format to export?