Eigenmode expansion (EME) is a computational electrodynamics modelling technique. It is also referred to as the mode matching technique[1] or the bidirectional eigenmode propagation method (BEP method).[2] Eigenmode expansion is a linear frequency-domain method.
It offers very strong benefits compared with FDTD, FEM and the beam propagation method for the modelling of optical waveguides,[3] and it is a popular tool for the modelling linear effects in fiber optics and silicon photonics devices.
https://en.wikipedia.org/wiki/Eigenmode_expansion
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