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IEICE Transactions on Electronics

A Single Flux Quantum (SFQ) Packet Swith Unit towards Scalable Non-blocking Router

Shinichi Yorozu, 義男 亀田, Shuichi Tahara

Published Mar 1, 2002• 0 citations
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We evaluate the performance of a single flux quantum (SFQ) circuit and discuss its possible system-level application. First, we describe an optical-electrical-SFQ hybrid router system that is divided into three functions: an SFQ packet-routing function, a control function, and an optical transmission function. For the packet-switching core, we have developed a packet-switching architecture based on an internal speedup time-shifted Batcher Banyan approach. Our simulated results show that this architecture should provide good scalability and a low packet-loss rate. Additionally, we have fabricated an asynchronous pulse arbitration circuit. This circuit is a key component in our packet-switching system. The circuit synchronizes two asynchronous incoming signals without any global clock signals. It consists of a clock generator based on a ring oscillator and data latches. By measuring the average output voltage of the Josephson junction, we confirmed the output signal control by the clock at over 60 Gbps throughput.
Large-scale telecommunication systems in nationwide networks will require routers having a packet switching throughput capacity of over several-tens of Tb/s. In such future high-end routers, packet switches will need higher processing speeds than semiconductor devices can provide. We have demonstrated a 40 GHz clock, 0.8 mW, 160 Gb/s, 4/spl times/4 switch circuit that uses single flux quantum (SFQ) technology. The main components of an SFQ circuit are Josephson junctions and a superconducting loop. In designing the circuit, we have developed two key technologies: an automatic cell placement and route tool to increase designable circuit scale; a passive interconnection to decrease latency. These technologies will enable implementing Tb/s-scale switches and switch schedulers for high-speed packet switching systems.