Abstract: For the proposed all-optical 3D grids of directional couplers and Mach-Zehnder interferometers, network models (1) and (6) and their routing algorithms are reviewed and some are presented and discussed in more details. (1) Planar cellular arrays superposed by by-passing networks (2) 3D cellular arrays described by their projection onto Cayley graphs (3) shuffle networks (4) Clos networks (5) Projection onto 2D grids mapped onto hypercubes and onto star and pancake graphs and (6) Sorting in all-optical 3D grids. The extension to geometries N $GREQ 5 and the introduction of wavelengths is briefly discussed. !40
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