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Paper Abstract and Keywords
Presentation 2025-10-10 14:55
Highest-ever spatial resolution in BOCDR operating at modulation frequencies near Brillouin bandwidth
Keita Kikuchi (SIT), Ryuki Ohata (YNU), Kohei Noda (UTokyo), Ryo Inoue (SIT), Yosuke Mizuno (YNU), Heeyoung Lee (SIT) OFT2025-61
Abstract (in Japanese) (See Japanese page) 
(in English) Brillouin optical correlation-domain reflectometry (BOCDR) is attracting attention because it enables distributed strain and temperature measurements along optical fibers. In BOCDR, position selectivity is achieved by applying frequency modulation to the light injected into the measurement system, and the spatial resolution is known to be inversely proportional to the product of the modulation frequency and the modulation amplitude. The theoretical upper limit of the modulation frequency that contributes to improving spatial resolution has long been regarded as on the order of the Brillouin bandwidth (~30 MHz). We recently observed the Brillouin gain spectrum (BGS) at modulation frequencies near the Brillouin bandwidth and clarified that, above 25 MHz, periodic components originating from the modulation frequency are superimposed on the BGS. However, the impact of these modulation-frequency components on measurement accuracy and signal-to-noise ratio had remained unresolved. In this study, we investigate the temperature dependence of the BGS at modulation frequencies near the Brillouin bandwidth and examine how the modulation-frequency components on the BGS affect temperature-measurement accuracy. Furthermore, we propose a suppression method for these components and demonstrate distributed measurement at a world-record spatial resolution of 6 mm using modulation frequencies exceeding the Brillouin bandwidth.
Keyword (in Japanese) (See Japanese page) 
(in English) Brillouin scattering / distributed optical fiber sensors / correlation-domain techniques / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 199, OFT2025-61, pp. 138-143, Oct. 2025.
Paper # OFT2025-61 
Date of Issue 2025-10-02 (OFT) 
ISSN Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee OFT  
Conference Date 2025-10-09 - 2025-10-10 
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 2025-10-OFT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Highest-ever spatial resolution in BOCDR operating at modulation frequencies near Brillouin bandwidth 
Sub Title (in English)  
Keyword(1) Brillouin scattering  
Keyword(2) distributed optical fiber sensors  
Keyword(3) correlation-domain techniques  
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1st Author's Name Keita Kikuchi  
1st Author's Affiliation Shibaura Institute of Technology (SIT)
2nd Author's Name Ryuki Ohata  
2nd Author's Affiliation Yokohama National University (YNU)
3rd Author's Name Kohei Noda  
3rd Author's Affiliation The University of Tokyo (UTokyo)
4th Author's Name Ryo Inoue  
4th Author's Affiliation Shibaura Institute of Technology (SIT)
5th Author's Name Yosuke Mizuno  
5th Author's Affiliation Yokohama National University (YNU)
6th Author's Name Heeyoung Lee  
6th Author's Affiliation Shibaura Institute of Technology (SIT)
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Speaker Author-1 
Date Time 2025-10-10 14:55:00 
Presentation Time 25 minutes 
Registration for OFT 
Paper # OFT2025-61 
Volume (vol) vol.125 
Number (no) no.199 
Page pp.138-143 
#Pages 6 
Date of Issue 2025-10-02 (OFT) 

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