I am a beginner in Interconnect.
In the lumerical example of optical filters https://kb.lumerical.com/en/pic_circuits_optical_filters.html , the wavelength dependence of directional coupler is not considered.
The coupling coefficient is set as a constant as shown in the figure below
However, we should take the wavelength dependency into consideration in the design of MZI-type filter.
How to set the coupling coefficient with different wavelengths?
I notice there is a "load from file " option, but I don’t know how to use.
Could someone help me solve the problem? Thank you very much.