Photonic switching implementations of 2-input, 2-output switching nodes based on 2-D and 3-D crossover networks

Thomas J. Cloonan; Frederick B. McCormick Jr.

doi:10.1117/12.25851

1 March 1991 Photonic switching implementations of 2-input, 2-output switching nodes based on 2-D and 3-D crossover networks

Thomas J. Cloonan, Frederick B. McCormick Jr.

Author Affiliations +

Proceedings Volume 1396, Applications of Optical Engineering: Proceedings of OE/Midwest '90; (1991) https://doi.org/10.1117/12.25851
Event: Applications of Optical Engineering: Proceedings of OE/Midwest '90, 1990, Rosemont, IL, United States

Abstract

3D networks and 2D network have been proposed for use in photonic switching systems and they may be able to provide higher density connectivity between logic devices than similar electronic implementations. In this paper optical implemen-. tations of both 2D and 3D crossover networks will be described. We show that crossover networks can be used for connecting multiple stages of 2-input 2-output switching elements as well as 2-input logic gates. We also show that these switching elements can be implemented using optical logic gates such as Symmeuic SEED devices. We then describe simple conversion steps that can be used to convert 2D crossover networks into 3D crossover networks. Since both network types can be implemented with low-loss optical imaging systems these networks may prove to be useful in future optical computing and photonic switching applications. 1. BACKGROIJND ON CROSSOVER NETWORKS The 2D crossover network is a multistage interconnection network that is based on crossover interconnectionsJ11 A 2D crossover network with N inputs and N outputs is shown in Fig. 1. The 2-input 2-output nodes within the network can be operated as 2-input 2-output switching elements or as 2-input logic gates. Crossover networks with 2-input 2-output nodes require that N where m is a positive integer. In addition fully-connected crossover networks have log2(N) nodestages with N nodes per node-stage and they have log2(N)-1 link-stages with N links per link-stage. In Fig. 1

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Thomas J. Cloonan and Frederick B. McCormick Jr. "Photonic switching implementations of 2-input, 2-output switching nodes based on 2-D and 3-D crossover networks", Proc. SPIE 1396, Applications of Optical Engineering: Proceedings of OE/Midwest '90, (1 March 1991); https://doi.org/10.1117/12.25851

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