Combined time-domain and correlation-domain Brillouin analysis with 1600 meters range and 2 centimeters resolution

David Elooz; Yair Antman; Avi Zadok

doi:10.1117/12.2059544

2 June 2014 Combined time-domain and correlation-domain Brillouin analysis with 1600 meters range and 2 centimeters resolution

David Elooz, Yair Antman, Avi Zadok

Author Affiliations +

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91576O (2014) https://doi.org/10.1117/12.2059544
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

A combined time-domain and correlation-domain Brillouin sensing scheme is demonstrated. Pump and signal waves are phase modulated by a high-rate, perfect Golomb code, which confines their interaction to discrete, 2 cm-long correlation peaks. The properties of the code substantially reduce off-peaks interactions. The pump wave is also amplitude modulated by a single pulse, so that amplifications at different correlation peaks can be separated in the time domain. The Brillouin gain spectra at all 80,000 resolution points of a 1,600 m-long fiber are reconstructed experimentally, using only 127 scans per frequency. A 3 cm-long hot spot is recognized.

Citation Download Citation

David Elooz, Yair Antman, and Avi Zadok "Combined time-domain and correlation-domain Brillouin analysis with 1600 meters range and 2 centimeters resolution", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91576O (2 June 2014); https://doi.org/10.1117/12.2059544

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