A classic example of why the LCO Panel Top matters involves the Z-extent (simulation volume).

You might draw a waveguide that is 10 microns long. However, if the App Top simulation window is set to a default of 100 microns (or conversely, cut short at 5 microns), your results will be nonsensical. The simulator is strictly obedient to the numbers in the LCO Panel Top, not the visual boundaries of your drawing.

Before hitting that "Run" button, always audit the App Top tab. Ask yourself:

The "Reports" section is a critical component, allowing LCOs to export data to Excel/PDF. Common reports include:

Before we dive into the "App Top" specifics, let’s set the stage. In RSoft, the LCO Panel is the central command console. It is the translation layer between the geometry you see and the mathematical rigor the simulator needs. It controls everything from simulation boundaries to input sources.

While the Design tab lets you draw pretty shapes, the LCO Panel dictates the physics.