Eigenmode Expansion (EME) or Bidirectional Eigenmode Propagation (BEP) simulates forward and backward propagation along one axis. It solves Maxwell’s equations in either TE or TM polarizations in the frequency domain and computes the fields at different cross-sections of the device.
The 2D Eigenmode Expansion Simulations Module allows you to simulate single wavelength reflection and transmission along the same axis quickly and reliably.
The BEP method is used for simulations though waveguides and structures where back reflections are required. It supports component simulation and optimization of elements that require both forward and backward direction, such as Bragg gratings, custom Multi Mode Interferometers (MMIs), and polarization components.
Figure 1: Top view of a Bragg grating
Figure 2: Side view of a Bragg grating
Figure 3: Result of the BEP propagation simulation in the Bragg gating depicted in Figures 1 and 2
Figure 4: Result of a BEP simulation on an MMI