Abstract
We introduce a system to simultaneously mitigate polarization and signal fading in distributed vibration sensors (DVS) that is based on using four sequential closely spaced pulses with different frequency and polarization. The polarization of the pulses is tuned using an all-fiber differential group delay. The technique is experimentally demonstrated in a 50-km differential phase-measuring DVS deploying linear frequency modulation of the pulses and matched filtering to provide compression of the pulses for 1.1-m effective spatial resolution and a total of 45,454 spatially-resolved points. Furthermore, a 500-Hz dynamic vibration of 138 ne is measured at the end of the fiber.
© 2018 The Author(s)
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