This video is taken from the FDE 100 course on Lumerical University.

## Transcript

The FDE solver can be used to characterize and study a wide variety of devices.

In this unit, we will review some examples available on Lumericalâ€™s Knowledge Base.

We can use the FDE solver to study when a simple fiber such as the SMF-28, becomes multimode.

We will start by calculating the modes at 1.55um, and then run a frequency sweep from

1um to 1.55um to determine when the effective index of the second mode gets lower than the

refractive index of the cladding.

The FDE solver can be used to characterize an edge coupler.

To get the power coupling between a fiber and a waveguide, we first calculate the modes

of interest for the fiber and for the waveguide, and then we use the overlap analysis to get

the power coupling between these modes.

We can use the FDE solver to analyze a photonic crystal fiber.

We can calculate the mode propagating and the bent loss depending on the radius of curvature.

The FDE solver can be used to determine the coupling length of an evanescent waveguide

coupler.

It can be used to estimate the total losses in a 90-degree waveguide bent.

The FDE solver can deal with anisotropic material.

Here we perform a dispersion analysis of a magneto-optical waveguide.

Finally, we use the FDE solver to find the circularly polarized modes in this helical

waveguide.