Enhancement of the sensitivity of a temperature sensor based on Fiber Bragg Gratings via weak value amplification

TL;DR

This paper demonstrates a weak value amplification technique to significantly enhance the sensitivity of Fiber Bragg Grating temperature sensors, enabling detection of smaller temperature changes with simple linear optics components.

Contribution

It introduces a novel weak value amplification scheme for Fiber Bragg Grating sensors, achieving nearly four times higher sensitivity using only linear optics.

Findings

Achieved a spectral shift of ~0.035 nm/°C, four times higher than standard methods.

Demonstrated the feasibility of simple linear optics for sensitivity enhancement.

Proved the potential for extending temperature detection range to lower values.

Abstract

We present a proof-of-concept experiment aimed at increasing the sensitivity of temperature sensors implemented with Fiber Bragg gratings by making use of a weak value amplification scheme. The technique requires only linear optics elements for its implementation, and appears as a promising method for extending the range of temperatures changes detectable to increasingly lower values than state-of the-art sensors can currently provide. The device implemented here is able to generate a shift of the centroid of the spectrum of a pulse of $\mathrm{\sim 0.035\,nm/^{\circ}C}$, a nearly fourfold increase in sensitivity over the same Fiber Bragg Grating system interrogated using standard methods.