How do I get the coupling efficiency of a specific waveguide mode?

Date	Category
2023-12-19 17:05:41	Monitors

The coupling efficiency of a specific waveguide mode can be calculated from the mode monitor data by first extracting the complex mode amplitude and then taking the square modulus.

# extract the complex mode amplitude from the mode monitor data
amp = sim_data["mode"].amps.sel(mode_index=0, direction="+")

# compute the coupling efficiency
T = np.abs(amp)**2

As an example, you can reference the waveguide Y junction case study.