Abstract
A simplified and accurate system of Brillouin optical correlation domain analysis for fiber-optic distributed strain sensing is proposed and demonstrated. In the system, pump and probe lightwaves, with about 11 GHz frequency difference for stimulating fiber Brillouin scattering, are generated accurately in a time-division way by using direct-frequency-modulation nature of a laser diode. We have developed a scheme for rigorously compensating frequency modulation response of the laser diode to realize accurately a rectangular frequency modulation with such large amplitude for the time-division pump-prove generation. Distribution of Brillouin gain spectrum along an optical fiber has successfully been measured, with 16 cm spatial resolution, using the waveform pre-compensated accurately for the laser frequency modulation.
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