Time expansion in distributed optical fiber sensing

초록

Centimeter-scale spatial resolution in time-domain distributed optical fiber sensing conventionally implies the use of sub-ns, energy-limited probe pulses and very large electrical detection bandwidths in the GHz range. These requirements imply a substantial reduction of the overall signal to noise ratio of the system and a considerable increase in the system cost and complexity due to the elevated digitizing and processing needs. In this talk, we will present a radically novel approach for time-domain distributed optical fiber sensing that allows a customized time-expansion of the received optical traces. The technique reaches cm-scale spatial resolutions while requiring remarkably low detection bandwidths, in the MHz range. With a careful engineering of the optical signals used, the signal to noise ratio of the system can be maximized while the processing requirements are minimized. I will show experimental work of my group in which this concept has been exploited in Rayleigh and Brillouin distributed sensing schemes. © 2025 SPIE.

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