Passive circuit design involves mode analysis (FDE), propgation (EME, varFDTD and FDTD), as well as INTERCONNECT. Please refer those examples: https://optics.ansys.com/hc/en-us and click Photonic Integrated Circuits - Passive
For active circuit design, CHARGE and HEAT solvers may be needed. Please click Photonic Integrated Circuits - Active
On the same page you can click each solver for more information.
There are also some 100-level videos: https://www.lumerical.com/search/?q=videos
Please have a look. Some may need you to log in as a customer.
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