Abstract
Abstract We report on a novel strain-gauge based on a graded-index (GI) multimode (MM) optical fibre fed through a fusion spliced singlemode (SM) fibre. The lowest order spatial mode is launched and propagates twice through the MM sensing fibre. Mismatch between the sinusoidal trajectories of the propagating modes relative to GI MM fibre pitch occurs due to the strain and is on-line converted to intensity modulation in the MM/SM interface. Results have shown linear response up to 4250 micro-strains (μe) range and resolution of 9 μe.
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