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

Idan Steinberg; Lihi Shiloh; Haniel Gabai; Avishay Eyal

doi:10.1117/12.2194873

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

Idan Steinberg, Lihi Shiloh, Haniel Gabai, Avishay Eyal

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.

Citation Download Citation

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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