We demonstrate a high-performance single-ended correlation-domain Brillouin sensor based on a phase modulation of Brillouin pump and a differential measurement scheme. Large DC noise induced by direct reflection of Brillouin pump was successfully removed by the phase modulation-based differential measurement as well as additional 4-fold enhancement in the spatial resolution. By applying an intentional loss to the end of a sensing fiber one of two correlation peaks within the fiber is suppressed, leading to double enlargement of the measurement range compared to former in-line reflector based systems. In the experimental confirmation a distributed strain measurement with a range of 100 m and a spatial resolution of 5 cm is presented.
We newly propose and experimentally demonstrate a differential lock-in detection scheme for the enhancement of
Brillouin optical correlation domain analysis (BOCDA), where additional phase modulation is applied to the Brillouin
pump wave and the on-off control on which is used for data acquisition. The theoretical model and the experimental
results show that at least three-fold improvement is obtained in the spatial resolution of the distributed measurements and
the Brillouin gain spectrum (BGS) with much narrower 3dB bandwidth than that of conventional BOCDA systems is
acquired by the differential lock-in detection.
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