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A bi-directional optical propagation tool
What is FIMMPROP?
FIMMPROP is a highly innovative tool for simulating propagation in optical waveguides in 2D and 3D, which is fully integrated as part of our optical mode solver FIMMWAVE and relies on the rigorous EigenMode Expansion (EME) method.
A powerful and versatile optical propagation tool
FIMMPROP is ideal for the modelling of optical propagation in structures with high refractive-index contrast, commonly found in silicon photonics and III-V integrated optics, for which approximate techniques such as the beam propagation method (BPM) would be inaccurate, and methods such as FDTD or FEM would be extremely slow.
This includes the simulation and optimisation of devices such as MMI couplers, optical gratings, co-directional couplers or polarisation converters. Thanks to its unique adaptive taper algorithm, it is also a very accurate and efficient method for the modelling of optical tapers (e.g. mode-size converters) and slowly z-varying structures such as ring resonators and Y-junctions.
For modelling optical gratings, FIMMPROP can use either EME or a form of RCMT (Rigorous Coupled Mode Theory) enhanced by Photon Design. The two methods are complementary, RCMT allowing you to model many grating geometries more efficiently and accurately than EME.
Explore the underlying physics of your designs
FIMMPROP is a great tool for the thinking optics designer since it provides not only a simulation result, but also a deep insight into what is going on inside the device thanks to its eigenmode approach, providing you with invaluable hints on how to improve your structures. Where methods such FDTD or BPM which would only provide you with the transmission, you will be able to study the evolution of mode power and mode properties along the structure, and find out exactly where and why your taper is radiating!
Benefits of EigenMode Expansion
FIMMPROP is based on the powerful EigenMode Expansion method (EME), with the following benefits:
Component design your for PIC circuit model
Components modelled with FIMMPROP can be easily exported to PICWave where they can be integrated in the simulation of photonic integrated circuits (PICs).
Link to ray tracing tools
FIMMPROP can import beam profiles from FRED and Zemax, and can export optical profiles back into these ray tracing tools.