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The force induced variations of interferences in multimode fiber (MMF) are recognized by the output specklegrams. In this work, the classification of specklegrams is reported to identify the magnitude and position of the force applied on the MMF. The specklegrams from the MMF are recorded by a CCD camera at different force conditions. Because of the large number of transverse modes in the fiber, the specklegrams contains abundant information about the force applied on fiber states. By employing a convolutional neural network (CNN), the classification accuracies of the force position and magnitude on the fiber were 95.91% and 96.67% for test dataset. This reported scheme has the advantages of low cost and simple structure and is suitable to identify specific types of force in distributed sensing applications.

Deep learning based force recognition using the specklegrams from multimode fiber