Orientation-dependent fiber-optic accelerometer based on eccentric fiber Bragg grating
Fengyi Chen, Ruohui Wang, Xingyong Li, Xueguang Qiao
Abstract
A highly localized eccentric fiber Bragg grating (EFBG) accelerometer was proposed, and its orientation-dependent measurement results were demonstrated experimentally. An EFBG was inscribed point-by-point (PbP) in a single-mode fiber (SMF) using a femtosecond laser, and the cladding mode was recoupled to excite the ghost mode through an abrupt taper. Owing to the asymmetry caused by the lateral offset of the EFBG, the ghost mode showed a significant directional response to acceleration. Furthermore, monitoring the fundamental core mode resonance can help calibrate accidental power perturbation or cross-sensitivity.
Topics & Concepts
OpticsFiber Bragg gratingCladding modeMaterials scienceFiber optic sensorAccelerometerOptical fiberPolarization-maintaining optical fiberFiber laserOffset (computer science)PhysicsComputer scienceQuantum mechanicsProgramming languageAdvanced Fiber Optic SensorsPhotonic and Optical DevicesAdvanced Fiber Laser Technologies