Multi waveguides coupler

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Waveguides are represented by the yellow rectangular. The first waveguide can be re-sized (click left)and whole strcutre can be moved (click right).

Applet parameters :
D1 : width of the first waveguide
D2 : width of the other waveguide
W.L. : wavelength
dn1 : index difference of the first waveguide
dn2 : index difference of the second waveguide
Spacing : spacing between waveguides
Length : Length of the computation window
Z : position of the transverse cut profile