Polarization fading mitigation in distributed acoustic sensors based on a high-speed polarization rotator
Shahab Bakhtiari Gorajoobi, Ali Masoudi, Gilberto Brambilla
Abstract
A distributed optical fiber acoustic sensor based on interferometric demodulation technique with no polarization fading is demonstrated. A polarization diversity scheme based on a high-speed polarization rotator is used to eliminate signal fading due to polarization mismatch in the Rayleigh backscattered signal between adjacent points on the sensing fiber. This technique yields a spatially uniform response to the applied strain. The sensor exhibited spatial and strain resolutions of <4 m and <7 nɛ, respectively.
Topics & Concepts
OpticsDemodulationFadingPolarization (electrochemistry)PhysicsDistributed acoustic sensingRayleigh scatteringPolarization rotatorInterferometryFiber optic sensorSignal processingPolarization-maintaining optical fiberOptical fiberOrthogonal polarization spectral imagingRayleigh fadingMaterials scienceOptical circulatorPolarimetryAcousticsPolarization mode dispersionDiversity combiningAntenna diversityDetection theoryAdvanced Fiber Optic SensorsAcoustic Wave Resonator TechnologiesMechanical and Optical Resonators