Abstract

We propose and experimentally demonstrate a method for temperature sensing using stimulated Brillouin scattering (SBS)-based slow light. The approach relies on temperature dependence of the Brillouin frequency shift in a fiber, hence the time delay of an input probe pulse. By measuring the delay, temperature sensing can be realized. We achieve temperature measurement in a $100\mathrm{m}$ single-mode fiber (SMF) using a cw pump. The main temperature-sensing range is $\sim 18°\mathrm{C}$ from the room temperature, limited by the SBS gain bandwidth. To apply the technique for measurement of a shorter fiber segment, a pulsed pump is used to introduce SBS slow light. Temperature sensing is achieved in a $2\mathrm{m}$ SMF with a main sensing range of around $\sim 25°\mathrm{C}$. The scheme is easily implemented, exhibits a relatively high temperature sensitivity with a resolution better than $1.0°\mathrm{C}$, and is potentially applicable for distributed sensing.

© 2011 Optical Society of America

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