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An innovative investigation of optical feedback or self-mixing interference within the cavity of a single-longitudinal-mode laser is described as an integral part of a novel interrogation scheme to be employed in a fiber Bragg grating-based sensor for strain measurement. The entire sensor device simply consists of a laser diode with an integrated photodiode which is coupled to a fiber Bragg grating...
A multimode fiber-loop ring-down spectroscopy combined with a fiber mode converter for strain measurement is presented. The bending loss theory in multimode fibers is used for the explanation of strain induced ring down cavity loss mechanism, which agrees well with the experimental results. With this technique, strain measurement is achieved in a time domain by measuring the ring-down time. The strain...
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