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A highly sensitive torsion sensor, which can measure the torsion angle and determine the torsion direction simultaneously, is proposed and demonstrated based on Sagnac interferometer by incorporating a segment of novel side-leakage photonic crystal fiber (SLPCF). The SLPCF was designed by introducing an elliptical Ge-doped core and a symmetrical linear side-leakage defect. The experimental results...
A compact in-line interferometer is demonstrated by splicing a piece of two-mode photonic crystal fiber (TPCF) between single mode fibers (SMFs). The TPCF is homemade and simulated based on extracted real cross section. The temperatures and strain induced interference pattern shifts with sensitivities of −43pm/°C and −0.62pm/µε are experimentally monitored.
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