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A multiplexing technique for fiber vibration sensors is experimentally investigated using Khazani Syed (KS) code in SAC/OCDMA with direct decoding. The system is proposed to implement vibration sensor multiplexing which can eliminate the Multiple Access Interference (MAI) at low cost and complexity. The results show the proposed system having better SNR, less complex, and low cost when compared with complementary decoding, and higher power level when compared with simplified WDM. A frequency range of 0 to 400 Hz measured shows its suitability for quasi-distributed sensing in bridges, pipelines, transformers, and industrial machine that exhibit low vibrations within this range.

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Intensity‐based fiber vibration sensor using optical collimators for remote vibration monitoring is investigated. The sensor is proposed for its rigidity and ability to be used in place of fiber Brags grating and interferometry sensor which are subjected to impairment in dynamic sensing due to their fragile nature. The result shows the proposed sensor having good linear response over the measured value and stability when tested over 1 h. The low frequency range of 0–180 Hz measured shows the suitability of the proposed sensor for remote vibration monitoring in bridge, electrical power generator, machines, and structures that exhibit low vibration. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:38–41, 2015