Line-neutral fiber optic sensing, combining time-division and frequency-division multiplexing techniques

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Abstract
Intensity modulation, induced by a modified microbending pressure sensor is considered as a possible transduction mechanism for detecting environmental changes. Implementations of these kind of sensors into multiple sensor systems is based on simple and reliable technology with multimode fiber, couplers, a reference and a multiplexing technique. A frequency domain technique is presented to interrogate unambiguously time division multiplexed sensors. Line neutrality is obtained by a referencing method. Torsion experiments with multimode fibers in a microbend pressure transducer application, to improve the sensor attenuation, are reported.

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