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Paper Abstract and Keywords
Presentation 2026-05-22 10:35
A Study on Fault Detection of Optical Fiber Communication Lines Utilizing an Optical Power Monitoring Method with an Optical Tap and an Infrared Image Sensor
Ryo Koyama, Tomohiro Kawano, Nobutomo Hanzawa (NTT) OFT2026-8
Abstract (in Japanese) (See Japanese page) 
(in English) In recent years, transmission traffic in data center interconnect (DCI) networks has increased rapidly due to the widespread adoption of cloud computing and generative AI, leading to large-scale deployment of high-count optical fiber cables. In such communication links, rapid fault detection and recovery are strongly required in the event of failures; however, conventional optical time-domain reflectometry (OTDR) testing is not suitable for continuous fault monitoring of high-count optical fiber cables. In this paper, we propose a batch fault detection method for multi-core optical fiber links by simultaneously monitoring the optical power of transmission signals and backward reflected light, based on a previously reported batch optical power monitoring technique using optical taps and an infrared image sensor. By using variations in the ratio of backward reflected light to transmitted light as an indicator, optical fiber faults can be detected. Fiber break experiments using a prototype optical power monitor demonstrated a maximum error of 0.52 dB for the reflected-light variation, confirming that fault detection with a threshold of ±0.5 dB is appropriate. Furthermore, the calculated results based on an optical fiber link model showed good agreement with the experimental results. In addition, an evaluation of the applicable monitoring distance using the proposed model revealed that practical fault detection is achievable for a fiber length of 10 km assuming 400GBASE‑LR8, while for a fiber length over 20 km, the detectable fault region is limited to within approximately 4 km from the transmitter side. The proposed method is therefore a promising technology for enabling rapid fault detection through continuous batch monitoring of multi-core optical fiber links with approximately 100 cores in data center internal wiring and DCI fiber cables.
Keyword (in Japanese) (See Japanese page) 
(in English) Optical fiber break / Fault detection / Optical fiber cable / Data center interconnect / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 33, OFT2026-8, pp. 31-35, May 2026.
Paper # OFT2026-8 
Date of Issue 2026-05-14 (OFT) 
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 OFT2026-8

Conference Information
Committee OFT  
Conference Date 2026-05-21 - 2026-05-22 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OFT 
Conference Code 2026-05-OFT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Fault Detection of Optical Fiber Communication Lines Utilizing an Optical Power Monitoring Method with an Optical Tap and an Infrared Image Sensor 
Sub Title (in English)  
Keyword(1) Optical fiber break  
Keyword(2) Fault detection  
Keyword(3) Optical fiber cable  
Keyword(4) Data center interconnect  
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1st Author's Name Ryo Koyama  
1st Author's Affiliation NTT (NTT)
2nd Author's Name Tomohiro Kawano  
2nd Author's Affiliation NTT (NTT)
3rd Author's Name Nobutomo Hanzawa  
3rd Author's Affiliation NTT (NTT)
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Speaker Author-1 
Date Time 2026-05-22 10:35:00 
Presentation Time 25 minutes 
Registration for OFT 
Paper # OFT2026-8 
Volume (vol) vol.126 
Number (no) no.33 
Page pp.31-35 
#Pages 5 
Date of Issue 2026-05-14 (OFT) 

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