#####  FUNCTION LIB  #####
function mx_FDE_dual_strip(wafer,w1,w2,gap){
    
    cladding = wafer.cladding;
    mx_rect('WG_inner',[-w1/2-gap/2,0,0],[w1,10e-6,wafer.Height],wafer.Material,1,0);
    mx_rect('WG_outer',[w2/2+gap/2,0,0],[w2,10e-6,wafer.Height],wafer.Material,1,0);
    
    if (wafer.clad_on){
        mx_rect('SiO2',[0,0,0],[cladding.Size*2+w1+w2+gap,cladding.Size,cladding.Height],cladding.Material,2,0);
        }
    else  {
        mx_rect('SiO2',[0,0,-cladding.Height/2-wafer.Height/2],[cladding.Size*2+w1+w2+gap,cladding.Size,cladding.Height],cladding.Material,2,0);
        }
    
    #inner = wl+gap;
    #outer = w2+gap;
    #return [inner,outer];
    }
    
function mx_FDE_strip(wafer,w){
    
    cladding = wafer.cladding;
    mx_rect('WG',[0,0,0],[w,10e-6,wafer.Height],wafer.Material,1,0);
    if (wafer.slab>=1e-10)    {
        mx_rect('slab',[0,0,-wafer.Height/2+wafer.slab/2],[cladding.Size*2+w,cladding.Size,wafer.slab],wafer.Material,1,0);
    }
    if (wafer.clad_on){
        mx_rect('SiO2',[0,0,0],[cladding.Size*2+w,cladding.Size,cladding.Height],cladding.Material,2,0);
        }
    else  {
        mx_rect('SiO2',[0,0,-cladding.Height/2-wafer.Height/2],[cladding.Size*2+w,cladding.Size,cladding.Height],cladding.Material,2,0);
        }
    
    #inner = wl+gap;
    #outer = w2+gap;
    #return [inner,outer];
    }
    
#####  FUNCTION LIB  #####
function mx_FDE_Disk(wafer,R){
    
    cladding = wafer.cladding;
    mx_rect('Disk',[-R,0,0],[R*2,10e-6,wafer.Height],wafer.Material,1,0);
        
    if (wafer.clad_on){
        mx_rect('SiO2',[0,0,0],[cladding.Size*2+R,cladding.Size,cladding.Height],cladding.Material,2,0);
        }
    else  {
        mx_rect('SiO2',[0,0,-cladding.Height/2-wafer.Height/2],[cladding.Size*2+R,cladding.Size,cladding.Height],cladding.Material,2,0);
        }
    
    #inner = wl+gap;
    #outer = w2+gap;
    #return [inner,outer];
    }