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Paper Abstract and Keywords
Presentation 2026-08-06 16:00
[Invited Talk] Toward Reliable Optical Datacenter Networks: From Nonblocking Guarantees to Fiber Verification
Takeru Inoue (Univ. Yamanashi), Kazuya Anazawa, Toru Mano (NTT) CCS2026-29
Abstract (in Japanese) (See Japanese page) 
(in English) Driven by demands for high capacity and low power consumption, data center networks (DCNs) are shifting from electrical packet switches to optical circuit switches (OCSs). Operating OCS-based DCNs in practice requires guaranteeing two distinct notions of "correctness." The first is logical correctness—namely, the nonblocking property, which ensures that any connection request can be accommodated without disrupting existing connections. The second is physical correctness—the integrity of the fibers, that is, the assurance that the tens of thousands of optical fibers are wired exactly as designed. This talk introduces a line of research that unifies these two aspects under the perspective of reliability assurance. For the former, we discuss the nonblocking condition for Clos fabrics that have become non-uniform due to the mixture of switch generations, together with a fast algorithm for deciding it. For the latter, we address a method that automatically verifies both the fiber topology and the fiber quality without re-attaching a tester to each individual fiber. A common feature of both lines of work is that they are grounded in combinatorial mathematics, achieving both theoretical guarantees and practical applicability to large-scale DCNs.
Keyword (in Japanese) (See Japanese page) 
(in English) Datacenter networks / optical circuit switches, / nonblocking switching networks / fiber topology and quality verification / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 143, CCS2026-29, pp. 18-23, Aug. 2026.
Paper # CCS2026-29 
Date of Issue 2026-07-30 (CCS) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF CCS2026-29

Conference Information
Committee IN CCS  
Conference Date 2026-08-06 - 2026-08-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Sapporo Educaton and Culture Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network Science, Future Network, Cloud/SDN/Virtualization, Contents Delivery/Contents Exchange, and others 
Paper Information
Registration To CCS 
Conference Code 2026-08-IN-CCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Toward Reliable Optical Datacenter Networks: From Nonblocking Guarantees to Fiber Verification 
Sub Title (in English)  
Keyword(1) Datacenter networks  
Keyword(2) optical circuit switches,  
Keyword(3) nonblocking switching networks  
Keyword(4) fiber topology and quality verification  
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1st Author's Name Takeru Inoue  
1st Author's Affiliation University of Yamanashi (Univ. Yamanashi)
2nd Author's Name Kazuya Anazawa  
2nd Author's Affiliation NTT Inc. (NTT)
3rd Author's Name Toru Mano  
3rd Author's Affiliation NTT Inc. (NTT)
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Speaker Author-1 
Date Time 2026-08-06 16:00:00 
Presentation Time 50 minutes 
Registration for CCS 
Paper # CCS2026-29 
Volume (vol) vol.126 
Number (no) no.143 
Page pp.18-23 
#Pages 6 
Date of Issue 2026-07-30 (CCS) 

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