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Dynamic strain measurement of identical weak FBG array based on active mode locking laser cavity

Gyeong Hun Kim, Hwi Don Lee, Youngjoo Chung, and Chang-Seok Kim

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Abstract

We demonstrate herein a novel interrogation system for an identical weak fiber Bragg grating (FBG) array based on an active mode locking laser cavity. The system can successfully and efficiently interrogate over 17 identical FBGs by detecting their mode-locked frequencies. The results confirm the large capacity (>17 identical FBGs), high interrogation speed (>5 kHz), high signal-to-noise ratio (>25 dB), and high linearity (R2 = 0.9998) of the proposed interrogator configuration.

© 2018 The Author(s)

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