Eiji Oki of Kyoto University

This talk explores advancements in optical circuit switching for multi-stage networks, a key architecture in next-generation data centers. Optical switching is valued for its high transmission capacity and energy efficiency, ensuring stable communication through dedicated connections during data transmission. Data centers require scalable network architectures to support large-scale data processing. Among them, CLOS networks enable efficient resource allocation with hierarchical switch interconnections. This talk focuses on optimizing optical-circuit-switched CLOS networks to expand the switching network size while maintaining controlled blocking quality. The talk begins with comparing packet-switched and circuit-switched networks, followed by CLOSnetwork structures and their variations, and an analysis of design models with the strict non-blocking condition or an admissible blocking probability guarantee. Key performance metrics, including switching network size and computational efficiency, are thoroughly evaluated from theoretical and practical perspectives. Drawing on recent research, the talk discusses the challenges of scaling CLOS networks and proposes directions for future development.

Biography:

Eiji Oki is a Professor at Kyoto University, Kyoto, Japan. He received the B.E. and M.E. degrees in instrumentation engineering and a Ph.D. in electrical engineering from Keio University, Yokohama, Japan, in 1991, 1993, and 1999, respectively. In 1993, he joined Nippon Telegraph and Telephone Corporation (NTT) Communication Switching Laboratories, Tokyo, Japan. He has researched network design and control, traffic control methods, and high-speed switching systems. From 2000 to 2001, he was a Visiting Scholar at Polytechnic University, Brooklyn, New York, where he was involved in designing terabit switch/router systems. He was engaged in researching and developing high-speed optical IP backbone networks with NTT Laboratories. He was with The University of Electro-Communications, Tokyo, Japan, from 2008 to 2017. He joined Kyoto University, Japan, in 2017. He has been active in the Internet Engineering Task Force (IETF). He has authored/contributed to twelve IETF RFCs. He has authored/co-authored nine books on the areas of networking and optimization. He is serving as a Distinguished Lecturer of the IEEE Communication Society from 2024 to 2025. He is a Fellow of IEEE and IEICE.

Email:

Address:Kyoto University, , Kyoto, Japan

Eiji Oki

- Abstract

This talk explores advancements in optical circuit switching for multi-stage networks, a key architecture in next-generation data centers. Optical switching is valued for its high transmission capacity and energy efficiency, ensuring stable communication through

dedicated connections during data transmission. Data centers require scalable network architectures to support large-scale data processing. Among them, Clos networks enable efficient resource allocation with hierarchical switch interconnections. This talk focuses on optimizing optical-circuit-switched Clos networks to expand the switching network size while maintaining controlled blocking quality. The talk begins

with comparing packet-switched and circuit-switched networks, followed by Clos network structures and their variations, and an analysis of design models with the strict non-blocking condition or an admissible blocking probability guarantee. Key performance metrics, including switching network size and computational efficiency, are thoroughly evaluated from theoretical and practical perspectives. Drawing on recent research, the talk discusses the challenges of scaling Clos networks and proposes directions for future development.

Biography:

Eiji Oki is a Professor at Kyoto University, Kyoto, Japan. He received the B.E. and M.E. degrees in instrumentation engineering and a Ph.D. in electrical engineering from Keio University, Yokohama, Japan, in 1991, 1993, and 1999, respectively. In 1993, he joined Nippon Telegraph and Telephone Corporation (NTT) Communication Switching Laboratories, Tokyo, Japan. He has researched network design and control, traffic control methods, and high-speed switching systems. From 2000 to 2001, he was a Visiting Scholar at Polytechnic University, Brooklyn, New York, where he was involved in designing terabit switch/router systems. He was engaged in researching and developing high-speed optical IP backbone networks with NTT Laboratories. He was with The University of Electro-Communications, Tokyo, Japan, from 2008 to 2017. He joined Kyoto University, Japan, in 2017. He has been active in the Internet Engineering Task Force (IETF). He has authored/contributed to twelve IETF RFCs. He has authored/co-authored nine books on the areas of networking and optimization. He is serving as a Distinguished Lecturer of the IEEE Communication Society from 2024 to 2025. He is a Fellow of IEEE and IEICE.

Email:

Address:Kyoto, Japan