Phase demodulation of hybrid 3×3 coupler and Sagnac interferometer for φ-OTDR

Phase demodulation of hybrid 3×3 coupler and Sagnac interferometer for φ-OTDR

A hybrid phase demodulation structure combining a 3 × 3 coupler and Sagnac interferometer is proposed to improve the spatial resolution and phase demodulation performance of the phase-sensitive optical time-domain reflectometer (φ-OTDR). Through: (1) identical optical path lengths in forward/reverse...

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Bibliographic Details
Main Authors: Binyuan Yang, Tingyu Wang, Jianzhong Zhang, Zhe Ma, Xiang He, Lipu Liu, Yixuan Wang, Mingjiang Zhang
Format: Article
Language:English
Published: Frontiers Media S.A. 2025-07-01
Series:Frontiers in Physics
Subjects:
distributed acoustic sensing
Sagnac interferometer
spatial resolution
amplitudefrequency response
phase demodulation
Online Access:https://www.frontiersin.org/articles/10.3389/fphy.2025.1609493/full
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https://www.frontiersin.org/articles/10.3389/fphy.2025.1609493/full

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