FIMMWAVE

Introduction

Features
‣ Design Interface
‣ Mode Solvers
    ‣ FMM Solver
    ‣ FDM Solver
    ‣ FEM Solver
    ‣ Eff. Index
    ‣ Fibre Solvers
‣ The MOLAB
‣ Design Utilities

Applications

Options

Publications

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The Fibre Solvers

Diverse fibre mode profiles calculated using the vectorial General Fibre Solver.

Find any mode for any fibre of any kind! FIMMWAVE offers a large range of fibre solvers, including a fully vectorial solver and a finite difference solver.

General Fibre Solver (optional module: Cylindrical Solvers)

This is a fully vectorial solver for generic circular waveguides with arbitrary non-absorbing refractive index. It will find all the modes of such structures using metallic or transparent boundaries. Although it is a fully vectorial solver it exploits the circular symmetry, thus making it extremely fast. A scalar version is also included.

Features:
Fully-vectorial and fast scalar versions
Supports perfect electric wall and perfect magnetic wall boundary conditions and Transparent boundary conditions. 
Mode analysis tools  - compute confinement factor, group index, dispersion etc, see utilities.

Finite Difference Fibre Solver (optional module: Cylindrical Solvers)

Solves an arbitrary circularly symmetric refractive index waveguide using a finite difference algorithm in a cylindrical coordinate system for speed; supports absorbing materials including metals; leaky modes; PMLs. This is our most flexible and powerful cylindrical solver.

Features:
Perfectly Matching Layers (PMLs)
Loss, gain, leaky modes
Metal clad fibres
Fully-vectorial and fast scalar versions
Supports perfect electric wall and perfect magnetic wall boundary conditions, Transparent boundary conditions
Mode analysis tools  - compute confinement factor, group index, dispersion etc, see utilities.

Gaussian Mode Fibre Solver (included in Base Module)

This is a quick utility for getting the fundamental mode using the Gaussian approximation. The user simply specifies the effective index and the spot size of the desired mode - useful where the fibre profile is not known.

Features:
Mode analysis tools  - compute confinement factor, group index, dispersion etc, see utilities.

Single Mode Fibre Solver (included in Base Module)

This Solver will compute the fundamental mode of a single-mode step index fibre, given core index, cladding index and core diameter.

Features:
Mode analysis tools  - compute confinement factor, group index, dispersion etc, see utilities.

See also the Mode Solver Features Table for comparison with other solvers.

Structures for which the Fibre Solvers are recommended:

Any structure with a circular symmetry.