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Unformatted text preview: Arrayed Waveguide Grating Router 6 Arrayed waveguide grating routers are used in fiber optic network telecommu- nications as multiplexers, demultiplexers, add-drop filters, and as NXN switches. The device, shown in the attached figure, consists of an array of channel waveguides with the optical path length of adjacent waveguides differing by a constant value. At the ends of the array of waveguides are input and output region slab waveguides. These slab wave- guide regions, in turn, are connected to input and output channel waveguides that are linked to individual optical fibers. The arrayed waveguide grating router can be conve- niently implemented as silica waveguides on a silicon wafer. The most basic operation of an arrayed waveguide grating router is perhaps as a demultiplexer. This mode may be visualized by considering two wavelengths in the cen- ter waveguide of the series of input channel waveguides. As these waves propagate across the input slab waveguide region their wavefronts expand to fill all of the waveguides in...
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- Spring '08