Enhanced Generalized Mach-Zehnder Interferometer for Tunable Channel Routing

A switch-fabric for the channel routing is presented which combines the wavelength-separation-ability of arrayed waveguide gratings (AWGs) with the tunability of generalized Mach-Zehnder interferometers (GMZIs). The resulting tunable filter allows to maximize and shift a desired spectral transmission-window, whereby the window-bandwidth is defined by waveguide-length-offsets.