Brillouin analysis with 8.8 km range and 2 cm resolution

Yosef London; Yair Antman; Nadav Levanon; Avi Zadok

doi:10.1117/12.2195254

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28 September 2015 Brillouin analysis with 8.8 km range and 2 cm resolution

Yosef London, Yair Antman, Nadav Levanon, Avi Zadok

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Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96340G (2015) https://doi.org/10.1117/12.2195254
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

Brillouin analysis of a 8.8 km-long fiber with 2 cm resolution is reported. Pump and signal are jointly modulated by a binary phase Golomb code. Over 2,000 correlation peaks are simultaneously introduced and interrogated in a single trace. All 440,000 resolution points are covered in just 211 scans of peaks positions. The pump wave is amplitude modulated by a second, 10,000 bits long code. Post-processing of the output signal provides a measurement signal-tonoise ratio that is equivalent to that of 5,000 single-pulse acquisitions. A 7cm-long hot spot is identified. The uncertainty in Brillouin frequency measurements is ±3.5 MHz.

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Yosef London, Yair Antman, Nadav Levanon, and Avi Zadok "Brillouin analysis with 8.8 km range and 2 cm resolution", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96340G (28 September 2015); https://doi.org/10.1117/12.2195254

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