- 标题
- 摘要
- 关键词
- 实验方案
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - On the Variability of Launching and Detection in POF Transmission Systems
摘要： POF commercial active devices present a variety of designs in which fibre coupling is achieved by different connector types. The particular characteristics and tolerances of transmitter and receiver designs are behind the variability of the fibre input and output angular power distributions, and consequently, we suggest that they are the cause of the high standard deviation usually found in POF measurements. Our aim here is to quantify the impact of the variability of the fibre coupling at the injection and the detection ends on transmission parameters of a POF link. We analysed two different source types and proposed a detector model whose parameters are based on experimental measurements. The standard deviations of power loss and frequency response are calculated using the propagation matrix model for the fibre, and also extracted from experimental measurements, revealing the contribution of both launching and detection conditions.
关键词： statistical analysis,optical communications,plastic optical fibres,experimental characterization
更新于2025-09-10 09:29:36
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Resource-efficient fibre-integrated temporal multiplexing of heralded single photons
摘要： We present a multiplexed single photon source that re-synchronises heralded single photons generated by four-wave mixing in photonic crystal fibre using a fibre delay loop controlled by a single switch. By combining the probabilities of generating heralded single photons on four consecutive pump pulses we obtain an enhancement of the per-bin single-photon delivery probability. Our source demonstrates a way in which single-photon source multiplexing may be carried out with minimised resource overhead while retaining the benefits of a robust and alignment-free platform.
关键词： nonlinear optics,quantum optics,optical fibres
更新于2025-09-09 09:28:46
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Radiation-induced loss of silica optical fibres with fluorine-doped cladding
摘要： The effect of gamma-irradiation of the fluorine-doped silica depressed cladding graded-index fibre (DCGIF) has been researched. New mechanism of the non-bridging oxygen hole centers (NBOHC) defect formation, conditioned by different mobility of diffusion counter flows of fluorine and oxygen at the core-cladding interface, has been proposed. Using silica tubes with 0.02 wt% of OH groups and hydrogen in free state in MCVD-technology of DCGIF fabrication completely eliminates the NBOHC absorption at the wavelength of 630 nm. However, gamma-irradiation of such fibres results in anomalously high attenuation level in the visible range of optical spectrum. It was established that irradiation of DCGIF leads to light scattering which is probably due to the appearance of optical inhomogeneities in the glass matrix.
关键词： fibre optics,Rayleigh scattering,fibre design and fabrication,radiation-resistant optical fibres
更新于2025-09-09 09:28:46
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Core-Shell Electrospun Polycrystalline ZnO Nanofibres for Ultra-Sensitive NO2 Gas Sensing
摘要： This paper discusses the growth of polycrystalline, self-supporting ZnO nanofibres which can detect nitrogen dioxide (NO2) gas down to 1 part per billion (ppb), one of the smallest detection limits reported for NO2 using ZnO. A new and innovative method has been developed for growing polycrystalline ZnO nanofibres. These nanofibres have been created using core-shell electrospinning of inorganic metal precursor zinc neodecanoate, where growth occurs at the core of the nanofibres. This process produces contamination-free, self-supporting, polycrystalline ZnO nanofibres of the average diameter and grain size 50 nm and 8 nm respectively, which are ideal for gas sensing applications. This process opens up an exciting opportunity for creating nanofibres from a variety of metal oxides, facilitating many new applications especially in the areas of sensors and wearable technologies.
关键词： NO2 gas sensing,polycrystalline fibres,ZnO nanofibres,Electrospinning
更新于2025-09-09 09:28:46
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Multifunctional Flax Fibres Based on the Combined Effect of Silver and Zinc Oxide (Ag/ZnO) Nanostructures
摘要： Cellulosic fibre-based smart materials exhibiting multiple capabilities are getting tremendous attention due to their wide application areas. In this work, multifunctional flax fabrics with piezoresistive response were developed through the combined functionalization with silver (Ag) and zinc oxide (ZnO) nanoparticles (NPs). Biodegradable polyethylene glycol (PEG) was used to produce AgNPs, whereas ZnONPs were synthetized via a simple and low-cost method. Flax fabrics with and without NPs were characterized by Ground State Diffuse Reflectance (GSDR), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), X-ray Diffraction (XRD), Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR), and Thermogravimetric analysis (TGA). After creating a conductive surface by flax functionalization with AgNPs, ZnONPs were synthetized onto these fabrics. The developed fibrous systems exhibited piezoresistive response and the sensor sensitivity increased with the use of higher ZnO precursor concentrations (0.4 M). Functionalized fabrics exhibited excellent antibacterial activity against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria, higher hydrophobicity (WCA changed from 00 to >1000), UV radiation resistance, and wash durability. Overall, this work provides new insights regarding the bifunctionalization of flax fabrics with Ag/ZnO nanostructures and brings new findings about the combined effect of both NPs for the development of piezoresistive textile sensors with multifunctional properties.
关键词： piezoresistive response,smart and multifunctional materials,cellulosic fibres,silver and zinc oxide nanoparticles,antibacterial effect,hydrophobicity
更新于2025-09-04 15:30:14
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Impact of Linear Mode Coupling on the Nonlinear Transmission Performance of Few-Mode Fibres
摘要： In this paper, we review the study of nonlinear transmission performance of few-mode fibre links operating for different linear mode coupling regimes and for different mode delay maps. We will describe how linear mode coupling and differential mode delay can be used to mitigate the overall nonlinear distortion and present optimum link configurations at practical levels of digital equalisation complexity.
关键词： linear mode coupling,differential mode delay,nonlinear analysis,few-mode fibres
更新于2025-09-04 15:30:14