Fig. 3: Experimental test of BETDA targeting a short range of 20 m.
From: Brillouin expanded time-domain analysis based on dual optical frequency combs
a Spectral configuration of RF combs. b Output waveforms of OFCs with constant (black) and random (red) phase distributions. 3D map of BGS along a 10 m SMF measured using dual OFCs with c a constant phase distribution and d a random phase distribution, respectively. The insets are examples of local BGS obtained at the position of 5 m
