We propose a Brillouin optical correlation-domain reflectometry
(BOCDR), which can measure the distribution of strain and/or temperature
along an optical fiber from a single end, by detecting spontaneous Brillouin
scattering with controlling the interference of continuous lightwaves. In a
pulse-based conventional Brillouin optical time-domain reflectometry
(BOTDR), it is difficult in principle to achieve a spatial resolution less than
1 m, and the measurement time is as long as 5-10 minutes. On the contrary,
the continuous-wave-based BOCDR can exceed the limit of 1-m resolution,
and realize much faster measurement and random access to measuring
positions. Spatial resolution of 40 cm was experimentally demonstrated with
sampling rate of 50 Hz.
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