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FemSIM Product Overview
FEM Generalized Mode Solver
FemSIM? is a generalized mode solver based on the Finite Element Method (FEM) that can calculate any number of transverse or cavity modes of an arbitrary structure on a non-uniform mesh. FemSIM employs a full-vector implementation and has been enhanced with many features to compute complex modes. The tool is flexible and extendable to a wide range of problems such as high-index contract, plasmonic, and photonic bandgap-based waveguides.
Simulation mesh for aircore photonic crystal fiber
Benefits
- Advanced implementation of the FEM algorithm allows for a wide range of simulation and analysis capabilities for different types of devices.
- Can be used in conjunction with other RSoft tools to solve for modes and then propagate them through a device.
- Fully integrated into the RSoft CAD Environment.
Applications
FemSIM has applications for mode solving to a wide range of integrated and nano-optic devices including, but not limited to:
- Structures with arbitrary profiles, including those with curved or uncommon shapes
- Structures with high index contrast and/or small feature sizes
- Air or solid core photonic fibers
- Lossy structures
- Silicon-based devices such as SOIs
- Polarization rotators
- Plasmonic waveguides
- Laser and PBG defect cavities
Features
- Full-vector analysis for both Cartesian and cylindrical (azimuthally symmetric) structures.
- Accommodates complex index for lossy materials and high index contrast profiles.
- Robust meshing scheme which conforms to the index profile using hybrid triangular and rectangular mesh elements.
- First and second order elements used to avoid spurious modes.
- PML and symmetric/anti-symmetric boundary conditions.
- Determination of propagating, leaky, and cavity modes.
- Higher order modes can be found with minimal additional computational expense.
- Computation of dispersion diagrams.
- Output information includes field profiles, propagation constants, overlap integrals, confinement factors, and diagnostics.
- Automated parametric studies and design optimization using MOST.
Simulation mesh for a rib waveguide with a tilted facet with a highly hybrid polarization both Ex and Ey components of the mode are shown
Application Gallery
