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Paper Abstract and Keywords
Presentation 2021-10-14 10:30
[Poster Presentation] Attempt to optimize delay fiber length in BOCDR
Mana Sakamoto, Haruki Sasage (SIT), Kohei Noda (Tokyo Tech/YNU), Kentaro Nakamura (Tokyo Tech), Yosuke Mizuno (YNU), Heeyoung Lee (SIT) OFT2021-26
Abstract (in Japanese) (See Japanese page) 
(in English) Brillouin optical correlation-domain reflectometry (BOCDR) is known as a distributed strain and temperature sensing technique with numerous advantages, such as operation by light injection to a single end of a sensing fiber, high spatial resolution, random accessibility to measuring points, and cost efficiency. In general, a relatively long delay fiber is inserted into a reference optical path to control the order of a correlation peak (corresponding to a sensing point) and to enable appropriate operation of the system. Excessively long or short delay fibers are known to deteriorate the system performance, but the optimal length of the delay fiber has not been clarified yet. In this work, as the first step to optimize the delay fiber length in BOCDR, in the case of full-length measurement (not distributed measurement), Brillouin gain spectra (BGSs) were evaluated when delay fibers with different lengths were used in the reference path. When the delay fiber is long, forwardly transmitted light involves Brillouin components caused either by Rayleigh backscattering after Brillouin backscattering or Brillouin backscattering after Rayleigh backscattering. We also experimentally proved this mechanism by investigating the BGS dependence on the relative polarization state.
Keyword (in Japanese) (See Japanese page) 
(in English) Distributed optical fiber sensors / Brillouin scattering / Rayleigh scattering / Delay fibers / Correlation-domain techniques / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 199, OFT2021-26, pp. 19-22, Oct. 2021.
Paper # OFT2021-26 
Date of Issue 2021-10-07 (OFT) 
ISSN Online edition: ISSN 2432-6380
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 OFT2021-26

Conference Information
Committee OFT  
Conference Date 2021-10-14 - 2021-10-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OFT 
Conference Code 2021-10-OFT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Attempt to optimize delay fiber length in BOCDR 
Sub Title (in English)  
Keyword(1) Distributed optical fiber sensors  
Keyword(2) Brillouin scattering  
Keyword(3) Rayleigh scattering  
Keyword(4) Delay fibers  
Keyword(5) Correlation-domain techniques  
1st Author's Name Mana Sakamoto  
1st Author's Affiliation Shibaura Institute of Technology (SIT)
2nd Author's Name Haruki Sasage  
2nd Author's Affiliation Shibaura Institute of Technology (SIT)
3rd Author's Name Kohei Noda  
3rd Author's Affiliation Tokyo Institute of Technology/Yokohama National University (Tokyo Tech/YNU)
4th Author's Name Kentaro Nakamura  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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 2021-10-14 10:30:00 
Presentation Time 80 minutes 
Registration for OFT 
Paper # OFT2021-26 
Volume (vol) vol.121 
Number (no) no.199 
Page pp.19-22 
Date of Issue 2021-10-07 (OFT) 

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