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Paper Abstract and Keywords
Presentation 2023-11-10 10:35
High-accuracy distributed strain sensing based on low-coherence BOCDR: simulation and experimental validation
Kenta Otsubo, Guangtao Zhu, Takaki Kiyozumi (YNU), Hiroshi Takahashi (YNU/NTT), Yusuke Koshikiya (NTT), Yosuke Mizuno (YNU)
Abstract (in Japanese) (See Japanese page) 
(in English) As a principle of distributed measurement of strain and temperature along an optical fiber, the strain/temperature dependencies of the frequency shift accompanied by Brillouin scattering have been widely utilized. Among various methods already reported, a correlation-domain method has advantages such as random accessibility and relatively high spatial resolution compared to other distributed measurement methods. However, in the method of directly modulating the laser frequency with sinusoidal waves, the amplitude modulation is inevitably accompanied, and the phase difference between amplitude modulation and frequency modulation, called AM-FM phase delay, deteriorates the precision of distributed strain/temperature measurement. In this work, we demonstrate from both simulation and experimental aspects that this effect can be mitigated using low-coherence Brillouin optical correlation-domain reflectometry (LC-BOCDR) based on periodic noise modulation. We investigate the characteristics of signal light modulated by periodic noise modulation and demonstrate through high-precision distributed strain measurements that this method will be an innovative technique with several advantages compared to standard sinusoidal-modulation BOCDR.
Keyword (in Japanese) (See Japanese page) 
(in English) Optical fiber sensors / Brillouin optical correlation-domain reflectometry / low coherence / noise modulation / / / /  
Reference Info. ITE Tech. Rep.
Paper #  
Date of Issue  
ISSN Online edition: ISSN 2424-1970
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Conference Information
Conference Date 2023-11-09 - 2023-11-10 
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Paper Information
Registration To IEICE-OFT 
Conference Code 2023-11-OCS-OFT-CMN-BCT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) High-accuracy distributed strain sensing based on low-coherence BOCDR: simulation and experimental validation 
Sub Title (in English)  
Keyword(1) Optical fiber sensors  
Keyword(2) Brillouin optical correlation-domain reflectometry  
Keyword(3) low coherence  
Keyword(4) noise modulation  
1st Author's Name Kenta Otsubo  
1st Author's Affiliation Yokohama National University (YNU)
2nd Author's Name Guangtao Zhu  
2nd Author's Affiliation Yokohama National University (YNU)
3rd Author's Name Takaki Kiyozumi  
3rd Author's Affiliation Yokohama National University (YNU)
4th Author's Name Hiroshi Takahashi  
4th Author's Affiliation Yokohama National University/Nippon Telegraph and Telephone Corporation (YNU/NTT)
5th Author's Name Yusuke Koshikiya  
5th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
6th Author's Name Yosuke Mizuno  
6th Author's Affiliation Yokohama National University (YNU)
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Speaker Author-1 
Date Time 2023-11-10 10:35:00 
Presentation Time 25 minutes 
Registration for IEICE-OFT 
Paper #  
Volume (vol) vol.47 
Number (no)  
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