Restorability of Rayleigh Backscatter Traces Measured by Coherent OTDR with Precisely Frequency-Controlled Light Source

Mutsumi IMAHAMA  Yahei KOYAMADA  Kazuo HOGARI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E91-B   No.4   pp.1243-1246
Publication Date: 2008/04/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.4.1243
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Sensing
Keyword: 
Rayleigh scattering,  coherent OTDR,  fiber sensor,  strain measurement,  temperature measurement,  

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Summary: 
This letter presents the first experimental results that confirm the restorability of Rayleigh backscatter traces from a single-mode fiber measured by using a coherent optical time domain reflectometer (OTDR) with a precisely frequency-controlled light source. Based on this restorability, we can measure the distributed strain and temperature along the fiber with a very high measurand resolution that is one to two orders of magnitude better than that provided by Brillouin-based techniques for a long length of fiber.