FE Mode Solver For Fimmwave 

   
               
           
   

Figure 1 Modelling a Holey Fibre. Left: The triangular mesh.                                            Right: The Ex field of the fundamental mode.

    
      Brief Description        
     

The FEM Solver brings the finite-element method to our flagship waveguide mode solver FIMMWAVE and is offered as an optional add-on to the FIMMWAVE base module. Using the FEM Solver you can automatically locate and analyse the eigenmodes of almost any waveguide supported by FIMMWAVE. It will model both real and lossy materials and anisotropic dielectric tensors (diagonal tensor) and will do so rapidly and accurately. 

      
      Features        
     

  • Real index and lossy materials 

  • Fast! In many instances, it is significantly faster than our FMM Solver in FIMMWAVE. 

  • Fully automatic mode finder (MOLAB in FIMMWAVE-speak) 

  • Finds many modes simultaneously 

  • First and second order elements 

  • Anisotropic materials (diagonal tensor exx != eyy != ezz , other terms zero) 

  • High quality, fast fully automatic mesh generator optimised for electro-magnetic problems 

  • Ideal for structures with curved interfaces or unusual shapes 

  • All features of FIMMWAVE available, including: 
    - Calculation of confinement factor, group index and dispersion 
    - Plot all fields of mode profiles in many forms – contour plot, colour maps, Gouraud (surface) plots 
    - Export all mode data to ASCII file. 
    - General Scanner to generate plots of mode properties versus any waveguide parameter – e.g. group index versus core refractive-index, confinement factor versus core thickness etc. 

  • Fully integrated with our EME propagation tool FIMMPROP – so that it may be used to generate the basis-set modes of a FIMMPROP simulation.

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        Figure 2 Intensity plots of two higher order modes of a highly elliptical fibre.    
        Applications      
       

    The The FEM Solver is ideally suited to the following sorts of waveguides:

  • Holey fibres

  • Elliptical fibres 

  • Odd-shaped waveguide with curved and/or slanting interfaces 
    Diffused waveguides and other structures with smoothly varying refractive index

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        Graphical tools      
               
         

    Figure 3 Left: The Ey- field of the fundamental TM mode of a ridge waveguide with slanting interfaces. Right: The minority (Ex) field of the same mode.

    		      
          FIMMPROP        
         

    The FEM-Solver is fully integrated into our innovative EME (eigenmode-expansion) propagation tool FIMMPROP. Thus you can for example, readily simulate a tapered holey fibre, or a co-directional coupler with sloping ridge side walls.

    		      
        More aboutFIMMWAVE      
             
       

    General
    What is FIMMWAVE?
    A flexible design interface
    A variety of robust 
    FE Mode Solver
    The Molab

     

    A variety of design utilities ....
    Feature/options table
    Mode solver Feature table
    Platforms
     Customer support