Thanks for the explanation. Basically its overlap analysis.
To calculate the overlap, you can use mode expansion monitor to get the mode decomposition:Using and understanding Mode Expansion MonitorsMode expansion monitor - Simulation object - Lumerical SupportMonitors - Mode Expansion - Setup & Tips - Lumerical SupportMonitors - Mode Expansion - Results & ApplicationsOr the better, simply use port: Ports (FDTD) - Simulation ObjectPort has mode source from FDE, DFT monitor and mode expansion monitor.
Hope this will solve the problem.
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