Publication Date: 9/20/2026

Event: 52nd European Conference on Optical Communication (ECOC 2026)

Reference: pp.1-4, 2026

Authors: Zehao Wang, Duke University; Anastasia Stroujkova, Enegis LLC; Franklin G. Horowitz, Horowitz Consulting; Jeffrey Eppink, Enegis LLC; Philip N. Ji, NEC Laboratories America, Inc.; Yaowen Li, NEC Laboratories America, Inc.; Peter Malin, Duke University, Enegis LLC; Tingjun Chen, Duke University

Abstract: We demonstrate passive borehole velocity profiling using coherent DAS on a 3 km geothermal well. Deconvolution interferometry with phase-weighted stacking recovers interval velocities from ambient and ground micro-vibrations without active sources, achieving <80 m/s mean absolute error at 0.5–1 km depth against a calibration shot ground truth.

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