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In this paper, a novel microfiber refractive index sensor prepared with tapering-twisting-tapering technique has been proposed and demonstrated for the first time. Experimental results show that the interference intensity of the novel microfiber increases with the increment of pre-tapered length and the intervening twist number. Furthermore, the refractive index sensitivity of this microfiber sensor...
A high-quality nanolayer graphene (NLG) coated hollow core fiber (HCF) platform has been demonstrated for accurate monitoring of refractive index (RI) changes so far mainly operate in liquids but not in air. The NLG with high index is deposited on the outer surface of the HCF, and an enhanced anti-resonant reflecting guidance is formed, which induces sharp periodic lossy dips in the transmission spectrum...
We propose a dual-parameter active fibre sensor based on a fibre ring laser using a single-mode-two-mode-single-mode (STS) fibre interferemeter and a four-mode FBG as the intracavity dual-parameter sensing element. The interferometric spectra of the STS are investigated with different core-offset parameters and few-mode fibre length. The highest LP11 mode excitation ratio is achieved with a 6µm core-offset...
We proposed and experimentally demonstrated five kinds of gas pressure sensors based on in-fiber devices, including a long period fiber grating written in air-core bandgap fiber, a fiber-tip air bubble, a polymer-capped Fabry-Perot interferometer, an inflated long period fiber grating and a twin-core fiber-based Mach-Zehnder interferometer, which exhibited a sensitivity of 137, 1036, 1130, 1680, 9600...
An optical fiber bend sensor assisted with a photonic crystal fiber(PCF) has been fabricated by splicing a section of photonic crystal fiber between two single mode fibers. Such a structure could be developed a Mach-Zehnder interferometer (MZI). The PCF-based MZI is sensitive to structure bending with a sensitivity of 6dB/m_1 and is independent on temperature only with a sensitivity of 0.01 dB/°C...
We proposed and experimentally demonstrated four kinds of high-sensitivity gas pressure sensors based on in-fiber devices, including a sub-micron silica diaphragm-based fiber-tip, a polymer-capped Fabry-Perot interferometer, an inflated long period fiber grating and a twin core fiber-based Mach-Zehnder interferometer, which have sensitivities of 1036, 1130, 1680, 9600 pm/MPa, respectively.
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