Journal
OPTICS EXPRESS
Volume 28, Issue 23, Pages 33841-33853Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.402925
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Funding
- Hong Kong Polytechnic University [1-ZVGB]
- National Natural Science Foundation of China [61827820, 61905096]
- CNERC (Project BBVH)
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We report a highly sensitive twist sensor based on a Sagnac interferometer constructed with a new type of optical fiber which contains an elliptical core and two large semicircular-holes, where the slow axis of the core orthogonal to the air-holes has a large sensitivity towards twist-induced birefringent changes. The novel fiber structure results in a highest twist sensitivity of 5.01 nm/degrees at a chosen dip over the range from 370 degrees-400 degrees. The resonance dips in the interference pattern respond with different rates in the wavelength shifts in the presence of physical parameters permitting to experimentally distinguish directional torsion, axial strain and temperature. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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