School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
microwave photonics ultrawide band (UWB) tunable switchable semiconductor optical amplifier (SOA) tunable time delay Frontiers of Optoelectronics
2017, 10(2): 180
1 滁州学院地理信息与旅游学院,安徽 滁州 239000
2 浙江臻善科技有限公司遥感处理应用中心,浙江杭州 311100
3 中国矿业大学环境与测绘学院,江苏 徐州 221116
为获取徐州市郊大气气溶胶污染特征规律,利用地基遥感手段对2013年7月~2014年5月间徐州市郊气溶胶特性参数进行分析,结果揭示:(1)受冬季燃煤 供暖和夏季秸秆焚烧等因素影响,气溶胶光学厚度季节特征显著,且月际、日内波动性显著;(2)气溶胶粒子多含水分,干粒子极少,主要为混合型和人为污染型; (3)5月气溶胶以粗粒子为主控粒子,其余月份均以细粒子为主,且气溶胶粒子类型多样,成分复杂;(4)春季粗模态的气溶胶粒子多于细模态粒子,夏季 则相反,秋冬季节粗细模态粒子分布相当;另外,观测期间内徐州市郊基本未受到沙尘天气的干扰,积聚模态下的细粒子对徐州市郊气溶胶高污染的贡献更大。
气溶胶光学厚度 Angstrom波长指数 尺度谱分布 复折射指数 徐州市郊 aerosol optical depth Angstrom exponent size distribution refractive index Xuzhou suburb 大气与环境光学学报
2017, 12(3): 169
Author Affiliations
Abstract
Key Laboratory of Optical Fiber Sensing & Communications (Ministry of Education), School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
An all-optical ultrawideband monocycle generator based on wavelength conversion in a semiconductor optical amplifier (SOA) and optical tunable delay in an optical delay line (ODL) is proposed and simulated. The system achieves optically switchable in pulse polarity and tunable in both the pulsewidth and radio frequency (RF) spectrum.
Microwave photonics ultrawideband (UWB) tunable switchable semiconductor optical amplifier (SOA) tunable time delay Photonic Sensors
2017, 7(1): 66