A novel ultra-broadband polarization splitter based on a dual-core photonic crystal fiber(DC-PCF)is designed.The full-vector finite element method and coupled-mode theory are employed to investigate the characteristic...A novel ultra-broadband polarization splitter based on a dual-core photonic crystal fiber(DC-PCF)is designed.The full-vector finite element method and coupled-mode theory are employed to investigate the characteristics of the polarization splitter.According to the numerical results,a graphene-filled layer not only broadens the working bandwidth but also reduces the size of the polarization splitter.Furthermore,the fluorine-doped region and the germanium-doped region can broaden the bandwidth.Also,the 4.78 mm long polarization splitter can achieve an extinction ratio of-98.6 d B at a wavelength of 1550 nm.When extinction ratio is less than-20 d B,the range of the wavelength is 1027 nm-1723 nm with a bandwidth of 696 nm.Overall,the polarization splitter can be applied to all-optical network communication systems in the infrared and near-infrared wavelength range.展开更多
气溶胶是地气系统辐射强迫评估的主要不确定来源之一,激光雷达探测的气溶胶廓线数据有助于定量评估气溶胶的气候效应。除已发布的气溶胶观测产品外,大量气溶胶激光雷达观测数据分布于文献中。然而,目前尚缺乏对气溶胶历史文献数据的整...气溶胶是地气系统辐射强迫评估的主要不确定来源之一,激光雷达探测的气溶胶廓线数据有助于定量评估气溶胶的气候效应。除已发布的气溶胶观测产品外,大量气溶胶激光雷达观测数据分布于文献中。然而,目前尚缺乏对气溶胶历史文献数据的整合分析。因此,聚焦现有观测产品较缺乏的激光雷达比参数,充分考虑气溶胶的类型差异,提出了一种激光雷达比历史文献数据的模糊综合评价分析方法。基于Web of Science数据库,发现不同类型气溶胶(沙尘、沙尘混合、火山灰、海洋、烟尘、城市工业气溶胶)的激光雷达比均呈高斯分布,且集中范围均存在重叠。历史文献数据能与气溶胶观测数据产品提供的数据形成互补,所提出的模糊综合评价分析方法有助于提升人们对气溶胶光学特性的认识。展开更多
基金Project supported by the State Key Laboratory of Luminescence and Applications(Grant No.SKLA-2020-01)。
文摘A novel ultra-broadband polarization splitter based on a dual-core photonic crystal fiber(DC-PCF)is designed.The full-vector finite element method and coupled-mode theory are employed to investigate the characteristics of the polarization splitter.According to the numerical results,a graphene-filled layer not only broadens the working bandwidth but also reduces the size of the polarization splitter.Furthermore,the fluorine-doped region and the germanium-doped region can broaden the bandwidth.Also,the 4.78 mm long polarization splitter can achieve an extinction ratio of-98.6 d B at a wavelength of 1550 nm.When extinction ratio is less than-20 d B,the range of the wavelength is 1027 nm-1723 nm with a bandwidth of 696 nm.Overall,the polarization splitter can be applied to all-optical network communication systems in the infrared and near-infrared wavelength range.
文摘气溶胶是地气系统辐射强迫评估的主要不确定来源之一,激光雷达探测的气溶胶廓线数据有助于定量评估气溶胶的气候效应。除已发布的气溶胶观测产品外,大量气溶胶激光雷达观测数据分布于文献中。然而,目前尚缺乏对气溶胶历史文献数据的整合分析。因此,聚焦现有观测产品较缺乏的激光雷达比参数,充分考虑气溶胶的类型差异,提出了一种激光雷达比历史文献数据的模糊综合评价分析方法。基于Web of Science数据库,发现不同类型气溶胶(沙尘、沙尘混合、火山灰、海洋、烟尘、城市工业气溶胶)的激光雷达比均呈高斯分布,且集中范围均存在重叠。历史文献数据能与气溶胶观测数据产品提供的数据形成互补,所提出的模糊综合评价分析方法有助于提升人们对气溶胶光学特性的认识。
