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Abstract:We demonstrate continuous distributed acoustic sensing over a 4400km long undersea cable. Bi-directional operation improves the strain signal-to-noise rate by >20dB, enabling 88000 50-m-spaced measurement points at a nominal telecom launch power.
* 3 pages, 2 figures. Proceedings of the Optical Fiber Communication Conference (OFC), Post-Deadline paper Th4C.7 2026