ɸgOTDR utilizing geometric phase

Sabahat Shaheen; Konstantin Hicke; Katerina Krebber

doi:10.1117/12.2678295

23 May 2023 Φ_gOTDR utilizing geometric phase

Sabahat Shaheen, Konstantin Hicke, Katerina Krebber

Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 126432H (2023) https://doi.org/10.1117/12.2678295
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium

Abstract

Geometric phase measured per beat period in a Φ-OTDR based on coherent heterodyne detection is used to measure strain. Proposed method is robust to polarisation mismatch fading as a polarisation mismatch between interfering beams is not a hindrance to the measurement of the geometric phase. The Geometric phase is a function of the intensities of the interfering beams as well as the envelope of the beat signal. Its calculation does not require phase unwrapping and accordingly does not suffer the phase unwrapping errors. It is required to be equated with the traditionally measured phase by applying a scaling factor. The spatial resolution of the measured strain is reduced as it is calculated per beat period. Results are verified using a piezo-electric transducer inline a fiber-under-test.

Citation Download Citation

Sabahat Shaheen, Konstantin Hicke, and Katerina Krebber "Φ_gOTDR utilizing geometric phase", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 126432H (23 May 2023); https://doi.org/10.1117/12.2678295

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