Abstract

An image-matching assisted dual-frequency phase-sensitive optical time domain reflectometry ($\Phi - {\rm{OTDR}}$) is proposed and demonstrated. Compared to the conventional dual-frequency $\Phi - {\rm{OTDR}}$, which retrieves data via curve matching, the proposed scheme can effectively improve the temporal resolution and measurement precision while keeping the spatial resolution without additional hardware. In the experiments, with a 10 s temporal window, the proposed scheme realized the same measurement precision as the conventional method that used a 40 s window, suggesting a fourfold improvement of temporal resolution. When both used the 10 s temporal window, the measurement error was suppressed from 21.4% to 1.2% in the sensing for a 2 m hot zone at the end of a 90-m fiber.

© 2021 Optical Society of America

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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