Directional segmented waveguide coupler

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Waveguides are represented by the yellow rectangular and they can be re-sized (click left)and moved (click right).

Applet parameters :
D1 : width of the first waveguide (segmented)
D2 : width of the second waveguide
W.L. : wavelength
dn1 : index difference of the first waveguide
dn2 : index difference of the second waveguide
DC : period duty-cycle
Period : period of the segmentation
Spacing : spacing between waveguides
Length : Length of the computation window
Z : position of the transverse cut profile