Abstract

A new implementation of heterodyning to measure spectral shifts of fiber Bragg gratings is described. A pair of closely matched phase-shifted gratings is used, and the separation of their transmission peaks is measured as a heterodyne beat frequency when illuminated with spectrally filtered incoherent light. This method can potentially offer high ($<1\mathrm{pm}$) resolution, fast (μs) measurement, and strain-temperature discrimination.

© 2019 Optical Society of America

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