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[Devika]

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 Monitors
Mode expansion monitor - Simulation object - Lumerical Support
Monitors - Mode Expansion - Setup & Tips - Lumerical Support
Monitors - Mode Expansion - Results & Applications
Or the better, simply use port: Ports (FDTD) - Simulation Object
Port has mode source from FDE, DFT monitor and mode expansion monitor.

Hope this will solve the problem.