We demonstrate a differential pulse-width pair Brillouin optical time-domain analysis (DPP- BOTDA) using and pulses with DC-coupled detection. A spatial resolution of and a narrowband Brillouin gain spectrum of are obtained simultaneously compared with with the use of pulses in a conventional BOTDA. The experimental results show that the differential Brillouin gain of a pulse pair is 7 times stronger than the direct Brillouin gain of BOTDA with the use of a pulse, and the temperature uncertainty is compared with for a pulse. As the pulse-width difference decreases from to , corresponding to a spatial resolution from to , the prediction of temperature uncertainty will only increase from to for DPP-BOTDA over a long single-mode fiber.
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