Ultrashort pulse laser based Raman DTS for midrange FUT high spatial resolution measurements

We report on a study of distributed fiber-optic temperature sensor based on Raman scattering, in which an ultrashort-pulse fiber laser is used as a source of optical probing pulses. Together with the short pulse duration and pulse repetition rate decimation scheme using an acousto-optical modulator, we were able to achieve experimentally 0.3 m spatial resolution over more than 8 km long fiber-under-test.