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Introduction
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Introduction
What is FIMMPROP?
FIMMPROP is a highly innovative tool
for simulating 2D and 3D propagation phenomena in waveguides. FIMMPROP is based on the EigenMode Expansion method (EME), and allows one to
analyse a variety of 3D waveguide structures in a rigorous
and fully vectorial manner.
A ring-resonator circuit simulated with FIMMPROP, showing its ability to
model wide-angle propagation and high delta-n structures
FIMMPROP is an inherently bi-directional tool, and will take all
internal reflections into account. It is therefore capable of modelling
structures, such as Bragg gratings or AR coatings, which are not solvable
by other methods such as BPM. It can also model devices with
with strong internal reflections, such as waveguides terminated by a
tilted or straight facet.
FIMMPROP can model wide angle problems as shown in the above picture -
just add more modes as the angle gets larger. Note that this is a true
"wide angle" algorithm, compared to so called "wide angle BPM" which can
only model light travelling at a wide angle if all the light is
travelling close to that same angle!
FIMMPROP has an extensive
component library which allows
the user to define tapers, bends and periodic sections from the
waveguide sections created in FIMMWAVE in just a few clicks. Structures
with Z-varying cross-sections such as tapers and Y-junctions are
computed using sophisticated extensions of EME developed at Photon
Design. It can also model tilted tilted facets and free space regions,
e.g. for waveguide-gap-fibre simulations.
FIMMPROP is a great tool for the thinking optics designer since it
provides not only a simulation result, but the eigenmode approach gives
you a deep insight into what is going on inside the device, often giving
invaluable hints about how to improve the structure.
The ease of use and the speed of the calculations make FIMMPROP the
ideal tool to design and optimise structures such as MMI couplers, mode
converters, co-directional couplers or polarisation converters.
EME enables the fields to be calculated using fast
semi-analytical methods. Once the modes of the waveguide are found then
propagation along the length of the section is near-instantaneous. It
also permit calculations to achieve high accuracy even for more
complicated structures.
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