The polarimetric sensing characteristics of multi-mode-fiber based tilted fiber Bragg grating (MMF-TFBG) have been analyzed and experimentally demonstrated. The physical "enlarged" fiber core enables the tilted gratings to excite multi high-order core modes with significantly different polarization dependence and well-defined "comb" profiles which are spectrally separated at different wavelength. Orientation-recognized twist/rotation measurement (-90° to 90°) has been achieved with sensitivity of 0.075 dB/deg by using a cost-effective double-path power detection (power monitoring of two orthogonal-polarimetric odd core-modes, i.e. LP11 and LP12).

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Keywords Optical fiber sensor, Tilted fiber grating, Vector rotation
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Conference 23rd International Conference on Optical Fibre Sensors
Liu, F. (Fu), Guo, T, Shang, L. (Libin), Zhang, Z. (Zhaochuan), Du, F. (Fa), Guan, B.-O. (Bai-Ou), & Albert, J. (2014). Orientation-recognized rotation measurement using single polarimetric multi-mode tilted fiber grating. Presented at the 23rd International Conference on Optical Fibre Sensors. doi:10.1117/12.2058466