We proposed and investigated a novel ring-core fiber (RCF) with a single-sided gradient index (SSGI) profile, which allows orbital angular momentum (OAM) modes transmission with improved mode separation and mode purity. Thanks to the SSGI profile design, the separation degree between the vector eigenmodes in the proposed RCFs has been highly increased by 26.2%, compared to the one with the conventional graded-index (GI) RCF. Meanwhile, the OAM mode purity in the SSGI-based RCF is expected to surpass 99.9%. providing a weakened spin-orbital coupling compared to the graded-index (GI) fiber. Results show that the purity of the generated and evaluated OAM modes is greater than 99.9%, benefiting minimized intrinsic crosstalk of lower than -30 dB during OAM mode propagation.
In this paper, a magnetic field sensor based on Terfenol-D coated optical fibers is proposed and demonstrated. In our scheme, standard single mode fibers are coated by a thick layer of a magnetostrictive composite consisting of Terfenol-D particles dispersed in a polymer, which is then utilized as sensing elements. The magnetic field-induced strain on single mode fibers coated by the Terfenol-D was interrogated by an optical frequency-domain reflectometry (OFDR). The experimental results show that the sensitivity of the magnetostrictive fiber sensor depends on the coating characteristics including the surface of coated optical fiber. The sensitivity of the proposed sensor is 0.175 με/mT.
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