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 Lumerical’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
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