Over 100km long ultra-sensitive dynamic sensing via Gated-OFDR

Idan Steinberg; Lihi Shiloh; Haniel Gabai; Avishay Eyal

doi:10.1117/12.2194873

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28 September 2015 Over 100km long ultra-sensitive dynamic sensing via Gated-OFDR

Idan Steinberg, Lihi Shiloh, Haniel Gabai, Avishay Eyal

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Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96341B (2015) https://doi.org/10.1117/12.2194873
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

Cumulative acoustically-induced phase modulation along the sensing fiber significantly degrades the performance of Optical Frequency Domain Reflectometry (OFDR) systems. Here we present a new method to mitigate this phenomenon using hybrid time-frequency interrogation and analysis. The method, which we term Gated-OFDR (G-OFDR), achieves remarkable results: ultra-sensitive dynamic sensing at z≈101km with 1.4m spatial resolution and acoustical sampling rate of 600Hz. As an example, the system detected and recorded, with high SNR, falls of two ~1g paperclips from height of ~20cm, on two fiber sections, 10m apart, at the end of the 101km fiber, without any crosstalk artifacts.

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Idan Steinberg, Lihi Shiloh, Haniel Gabai, and Avishay Eyal "Over 100km long ultra-sensitive dynamic sensing via Gated-OFDR", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96341B (28 September 2015); https://doi.org/10.1117/12.2194873

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