Resolving 1 million sensing points in an optimized differential time-domain Brillouin sensor

A differential pulse-width pair (DPP) Brillouin distributed fiber sensor is implemented to achieve centimetric spatial resolution over distances of several kilometers. The presented scheme uses a scanning method in which the spectral separation between the two probe sidebands is kept constant, while the optical frequency of the pump is swept to scan the Brillouin spectral response. Experimental results show that this method avoids detrimental temporal distortions of the pump pulses, which in a standard implementation prevent the DPP method from operating over mid-to-long distances. Such a novel scanning procedure allows the resolving, for the first time in pure time-domain Brillouin sensors, of 1,000,000 sensing points, i.e., 1 cm spatial resolution over 10 km in a conventional acquisition time.


Published in:
Optics Letters, 42, 10, 1903-1906
Year:
2017
Publisher:
Washington, Optical Society of America
ISSN:
1539-4794
Keywords:
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 Record created 2017-05-08, last modified 2019-03-17

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