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Paper Abstract and Keywords
Presentation 2021-10-15 11:10
Multimodal interference sensor with dynamically controllable active area
Heeyoung Lee, Chenxu Zhao (SIT), Takaki Kiyozumi (YNU), Kentaro Nakamura (Tokyo Tech), Yosuke Mizuno (YNU) OFT2021-46
Abstract (in Japanese) (See Japanese page) 
(in English) Strain and temperature sensing based on multimodal interference in optical fibers has recently been gathering tremendous attention. One of its simple and cost-efficient implementations is based on what we call a single-mode-multimode-single-mode (SMS) structure, where a multimode fiber (MMF) is sandwiched by two single-mode fibers (SMFs). It is, however, difficult to control the length of an active area (i.e., a fiber section with strain/temperature sensitivity) in SMS-based sensors, because the MMF length cannot be changed. To solve this problem and widen the application field, in this work, we develop a new configuration of a modal-interference-based temperature sensor by connecting two SMFs with different cut-off wavelengths and by applying a load to one of the SMFs. The fiber section between the connector and the load operates as the active area, which is dynamically controllable by changing the load position. First, we observe a transmitted light spectrum and verify the appearance of spectral patterns unique to modal interference. Subsequently, we investigate the dependence of the wavelength interval (of the interference patters) on the active area length. The interval is shown to be inversely proportional to the active length, proving the operating principle of this sensor. Finally, we investigate the temperature dependence of the interference patterns (when the active length is 0.3 m) and show that this scheme is potentially applicable to temperature sensing.
Keyword (in Japanese) (See Japanese page) 
(in English) Optical fiber sensors / Modal interference / Single-mode-multimode-single-mode (SMS) structure / Cut-off wavelength / Temperature sensing / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 199, OFT2021-46, pp. 97-100, Oct. 2021.
Paper # OFT2021-46 
Date of Issue 2021-10-07 (OFT) 
ISSN Print edition: ISSN 0913-5685  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 OFT2021-46

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) Multimodal interference sensor with dynamically controllable active area 
Sub Title (in English)  
Keyword(1) Optical fiber sensors  
Keyword(2) Modal interference  
Keyword(3) Single-mode-multimode-single-mode (SMS) structure  
Keyword(4) Cut-off wavelength  
Keyword(5) Temperature sensing  
1st Author's Name Heeyoung Lee  
1st Author's Affiliation Shibaura Institute of Technology (SIT)
2nd Author's Name Chenxu Zhao  
2nd Author's Affiliation Shibaura Institute of Technology (SIT)
3rd Author's Name Takaki Kiyozumi  
3rd Author's Affiliation Yokohama National University (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)
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Speaker Author-1 
Date Time 2021-10-15 11:10:00 
Presentation Time 25 minutes 
Registration for OFT 
Paper # OFT2021-46 
Volume (vol) vol.121 
Number (no) no.199 
Page pp.97-100 
Date of Issue 2021-10-07 (OFT) 

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