Abstract

This Letter proposes a novel phase-sensitive optical time domain reflectometry ($\Phi$-OTDR) with continuous chirped-wave (CCW), which can make full use of both time and frequency domain resources. The principle and benefits of CCW $\Phi$-OTDR are elaborated. With the merit of CCW $\Phi$-OTDR, 1.042 MHz sensing bandwidth and $5 \;{\rm{p}}\unicode{x03B5}{{/}}\sqrt {{\rm{Hz}}}$ strain sensitivity are achieved along a 1013 m fiber with 4.4 m spatial resolution. To the best of the authors’ knowledge, this is the first time that a $\Phi$-OTDR achieves megahertz sensing bandwidth with metric spatial resolution, and without limiting the frequency feature of the disturbance. The good performance in long-range sensing is also verified over a 49.7 km fiber. More than that, the digital domain flexibility of the proposed scheme can be used to optimize the measured acoustic signal according to its feature and the practical needs.

© 2021 Optical Society of America

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