n-Dimensional Processor Arrays with Optical dBuses

dBus-array(k,n) is an n-dimensional processor array of kⁿ nodes connected via k^n–1 dBuses. A dBus is a unidirectional bus which receives signals from a set of k nodes (input set), and transmits signals to a different set of k nodes (output set). Two optical implementations of the dBus-array(k,n) are discussed. One implementation uses the wavelength division multiplexing as in the wavelength division multiple access channel hypercube WMCH 7]. WMCH(k,n) and dBus-array(k,n) have the same diameter and about the same average internode distance, while the dBus-array requires only one tunable transmitter/receiver per node, compared to n tunable transmitters/receivers per node for the WMCH. The other implementation uses one fixed-wavelength transmitter/receiver per node and the dilated slipped banyan switching network (DSB) 17] to combine time division and wavelength division multiplexing.