Abstract

An in-fiber Bragg grating (FBG) dynamic strain sensing system based on a fiber ring laser configuration and the eigenvector spectrum analysis method, is proposed and demonstrated. An ultrahigh dynamic strain resolution of 3.4×10–6 nε /Hz1/2 is achieved due to both the use of the advanced spectrum analysis method and the high optical signal to noise ratio (SNR) (~65dB) of the sensing signal. This is the highest dynamic strain resolution achieved so far for a FBG-only sensor, to the best of our knowledge.

© 2007 Optical Society of America

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