1. An optical switching system comprising: a plurality of interconnected wavelength selective switching units, each of the wavelength selective switching units associated with one or more server racks, the interconnected wavelength selective switching units being arranged into a fixed structure high-dimensional interconnect architecture comprising a plurality of fixed and structured optical links, the links arranged in a k-ary n-cube, ring, mesh, torus, direct binary n-cube, indirect binary n-cube, Omega network or hypercube architecture.