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multi-mode fiber
Ki-Hyun Kim,Byoungho Lee +1 more
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TLDR
In this paper, a single mode fiber is used as a point-like input beam source for a multi-mode fiber, and the amplitude of the output beam is expressed by the complex amplitude of input beam.Abstract:
There have been many displacement sensing methods based on optical fibers such as using mode scrambling of multi-mode fibers or intensity change of single mode fibers due to coupling mismatch[l2]. In this work, we used as displacement sensing the mode excitation change caused by spatial variation of input beam. A single mode fiber is used as a point-like input beam source for a multi-mode fiber. Since the core size of the multi-mode fiber is about 10 times larger than that of the single mode fiber, if two fibers are closely located and the multi-mode fiber is sufficiently long, the input beam from the single mode fiber excites many modes of the multi-mode fiber without power loss. In that case, the complex amplitude of output beam is expressed ad31read more
References
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Journal ArticleDOI
Multimode fiber sensing by using mean-absolute speckle-intensity variation
TL;DR: A fiber-sensing technique that detects the mean-absolute speckle-intensity variation between the updated and the reference Speckle pattern for determining the environmental perturbation factor (e.g., displacement, temperature, pressure, acoustic wave) is presented.
Journal ArticleDOI
Dynamic fiber specklegram sensing
TL;DR: The dynamic sensing technique can be applied to a variety of sensing parameters, e.g., strain, stress, temperature, and possibly seismic monitoring, and the dynamic aspects of the fiber status are determined.
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