TDM Hypercube and TWDM Mesh Optical Interconnections

Abstract

We propose the time division multiplexed hypercube (TDM-cube) and the time/wavelength division multiplexed mesh (TWDM-mesh). The TDM-cube is an extension of the earlier work by Thompson on the dilated slipped banyan network, DSB. While the DSB(N) provides the complete connection among N users in O(N) time via the time division multiplexing, the TDM-cube(N) implements the binary hypercube interconnection among N users in O(log2N) time. The TWDM-mesh(n2) uses a DSB(n), and combines the TDM and WDM. Like the Bus-Mesh, it requires at most 2 hops to send a packet from one node to any other node. The TWDM-mesh has a much higher network throughput than the Bus-Mesh. Both the TDM-cube and TWDM-mesh require only one fixed-wavelength transmitter/receiver per node, and they have a simple column control and dilated operation. The performance in terms of scalability, delay, and throughput is considered.