Abstract

This Letter presents an ultrahigh resolution optic fiber strain sensor. A random distributed feedback fiber laser (RDFL) is locked by the proposed frequency-shift Pound–Drever–Hall technique, which tracks the resonant frequency change of a $\pi$-phase-shifted fiber Bragg grating. The random distributed feedback for the RDFL gives a Lorentzian envelope over the original laser frequency noise, which can suppress the thermally induced frequency noise. The frequency noise of the laser is reduced from about 100 to 20 Hz/√Hz at 1 kHz. An ultrahigh dynamic strain resolution of $140\mathrm{f\epsilon }/\surd \mathrm{Hz}\text{at}1\mathrm{kHz}$ is achieved.

© 2018 Optical Society of America

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