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Paper Abstract and Keywords
Presentation 2010-01-22 09:20
Combination of External Phase Modulation and Synthesis of Optical Coherence Function for Improvement of Spatial Resolution in Long-length FBG Sensing System
Koji Kajiwara, Zuyuan He, Kazuo Hotate (Univ. of Tokyo) OFT2009-76
Abstract (in Japanese) (See Japanese page) 
(in English) External phase modulation is newly combined with the synthesis of optical coherence function for improvement of spatial resolution in distributed sensing system using a long-length fiber Bragg grating. It is possible to know the Bragg wavelength distribution along a long-length FBG by measuring local reflection spectra inside the grating, and this technique can be applied to a distributed sensing of strain and temperature. The spatial resolution of sensing systems based on synthesis of optical coherence function is inversely proportional to the optical power spectrum band-width of the light source. Therefore, we newly introduced external optical phase modulation to enlarge the bandwidth of the lightwave. The spatial resolution is improved from previously-reported 9.8 mm to 4.0 mm.
Keyword (in Japanese) (See Japanese page) 
(in English) Fiber Bragg Grating / Distributed Sensor / Synthesis of Optical Coherence Function / External phase modulation / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 377, OFT2009-76, pp. 77-82, Jan. 2010.
Paper # OFT2009-76 
Date of Issue 2010-01-14 (OFT) 
ISSN Print edition: ISSN 0913-5685    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 2010-01-21 - 2010-01-22 
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 2010-01-OFT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Combination of External Phase Modulation and Synthesis of Optical Coherence Function for Improvement of Spatial Resolution in Long-length FBG Sensing System 
Sub Title (in English)  
Keyword(1) Fiber Bragg Grating  
Keyword(2) Distributed Sensor  
Keyword(3) Synthesis of Optical Coherence Function  
Keyword(4) External phase modulation  
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1st Author's Name Koji Kajiwara  
1st Author's Affiliation The University of Tokyo (Univ. of Tokyo)
2nd Author's Name Zuyuan He  
2nd Author's Affiliation The University of Tokyo (Univ. of Tokyo)
3rd Author's Name Kazuo Hotate  
3rd Author's Affiliation The University of Tokyo (Univ. of Tokyo)
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Speaker Author-1 
Date Time 2010-01-22 09:20:00 
Presentation Time 25 minutes 
Registration for OFT 
Paper # OFT2009-76 
Volume (vol) vol.109 
Number (no) no.377 
Page pp.77-82 
#Pages 6 
Date of Issue 2010-01-14 (OFT) 

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