Fault Tolerance in Optical Networks; A study of electronic in- and egress interconnections in Torus topologies

The ingress and egress nodes in an all-optical network have an electronic inand egress part and an optical switch. This work analyses various architectures for interconnection of the "electronic" and "optical" parts of the network in order to tolerate single optical switch failures and single optical link failures. The architectures studied are: non-redundant (reference), fault tolerant optical nodes and multihoming of the electronic inand egress to home node and all neighbouring nodes. The network topology studied is a two-dimensional torus network with symmetric traffic. Network configurations having comparable properties with regard to dependability and traffic transport capacity are compared with respect to link capacity and node switching requirements, i.e. cost.