High-Resolution Trans-Oceanic Distributed Acoustic Sensing Enabled by a Bi-Directional Sensor Implementation

TL;DR

This paper demonstrates high-resolution distributed acoustic sensing over a 4400km undersea cable using a bi-directional sensor implementation, significantly enhancing signal quality and enabling dense measurement points for large-scale ocean monitoring.

Contribution

The study introduces a bi-directional sensor implementation that improves strain signal-to-noise ratio and allows dense acoustic sensing over ultra-long undersea cables.

Findings

Achieved continuous sensing over 4400 km of undersea cable.

Enhanced strain signal-to-noise ratio by over 20 dB.

Enabled 88,000 measurement points at 50-m spacing.

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.