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Sensors 2012, 12(9), 12836-12843; doi:10.3390/s120912836
Article

Restoration of Reflection Spectra in a Serial FBG Sensor Array of a WDM/TDM Measurement System

1
,
1
,
1,*  and 2
1 Center for Safety Measurement, Korea Research Institute of Standards and Science, Yuseong-gu, Daejeon 305-340, Korea 2 Department of Information and Communications, School of Photon Science and Technology, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
* Author to whom correspondence should be addressed.
Received: 12 June 2012 / Revised: 12 September 2012 / Accepted: 13 September 2012 / Published: 20 September 2012
(This article belongs to the Section Physical Sensors)
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Abstract

A restoration method for reflection spectra in a serial FBG sensor array with spectral shadowing is proposed and experimentally demonstrated in a WDM/TDM combined multiplexing system. The SNR of each FBG sensor is formulated and analyzed as a function of the number and reflectivities of serial FBG sensors. The maximum number of FBG sensors in a single fiber line can be determined by the approximate formula. In the test using two FBG sensors, the restored reflection spectrum of second FBG sensor is shown to be very well matched with the original reflection spectrum. Using the proposed restoration method, the maximum peak detection error in a strain experiment is suppressed drastically by almost seven-fold, from 0.074 nm to 0.011 nm.
Keywords: reflection spectrum restoration method; fiber Bragg grating sensor array; WDM/TDM; maximum peak detection error; strain experiment reflection spectrum restoration method; fiber Bragg grating sensor array; WDM/TDM; maximum peak detection error; strain experiment
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hwang, D.; Seo, D.-C.; Kwon, I.-B.; Chung, Y. Restoration of Reflection Spectra in a Serial FBG Sensor Array of a WDM/TDM Measurement System. Sensors 2012, 12, 12836-12843.

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