【摘 要】
：
A piece of domestic polarization-maintaining photonic crystal fiber (PM-PCF, 964 m in length) is made into a fiber coil, and its polarization extinction ratio (PER) is measured in a temperature range of –45–80 oC before and after PM-PCF is wound and solid
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
A piece of domestic polarization-maintaining photonic crystal fiber (PM-PCF, 964 m in length) is made into a fiber coil, and its polarization extinction ratio (PER) is measured in a temperature range of –45–80 oC before and after PM-PCF is wound and solidified. A fiber coil made of commercial panda PM fiber (PMF) is also fabricated and measured for comparison. Our experiments show that the PER variation of the PM-PCF coil (2.25 dB) is far smaller than that of the panda PMF coil (10 dB) in the whole temperature range because PM-PCF is intrinsically insensitive to the temperature variation and stress in the fiber coil induced by the winding and solidification process. This characteristic is important for the real application of PM-PCFs in temperature-insensitive fiber interferometers, fiber sensors, and optical fiber gyroscopes.
其他文献
美帝西屋空气制动器公司联合开关与信号分部声称已制成一种自动识别火车车厢的激光装置。该装置由氦-氖激光器、两个光束导向反射镜及光电场效应晶体管扫描装置组成。使用此种系统的车厢两侧还装有对反射压力敏感的条状物，将激光束反射回识别装置。
由于散射介质的强散射作用,传统光学成像系统无法对散射介质后的物体进行成像与运动追踪。针对这一问题,提出了一种透过散射介质对运动物体进行追踪与重建的方法。基于散射介质的光学记忆效应理论,通过先验信息解算散射成像系统的点扩展函数,利用点扩展函数的轴向缩放关系确定轴向位移,利用重建物体的互相关确定横向偏移。基于此方法搭建的实验系统也很好地实现了散射介质后物体的快速重建与运动追踪。所提方法仅需采集移位物体
Over the last few decades, several all-optical circuits have been proposed to meet the need of high-speed data processing. In some information processing architectures, the role of various analog and digital data comparisons is very important. In this let
1966年7月4~8日在奥地利萨尔斯堡（Salzburg)举行了第三届国际磁流体动力发电讨论会。会议由国际原子能局和欧洲核能局共同主办。会上宣读论文200篇，其中苏修69篇，美帝44篇，英帝16篇。共计2 6个国家的近400名代表参加了讨论会。
美国洛斯·阿拉莫斯实验室制造了一种电能式量热器。用于测定目前世界上最大的CO2激光器的 能量——10千焦耳。制造这种量热器所使用的材料和工艺方法，能够保证量热器确能承受极高能激光的轰击。这一制造技术还将用于制造测量Antares激光器能量的量热器。Antares激光器是一台40千焦耳的CO2激光器，它即将由洛斯·阿拉莫斯实验室制成，能将40千兆瓦的激光能量射在充氘和氚的微型靶上。40千兆瓦的能量约相当于六个洛杉肌市需用的能量总和。
Reflective fiber optic sensors have advantages for surface roughness measurements of some special workpieces, but their measuring precision and efficiency need to be improved further. A least-squares support vector machine (LS-SVM)-based surface roughness
建筑物提取在建筑物重建和城市管理中起着重要的作用。利用基于植被指数限制的分水岭算法分割机载激光雷达点云,并利用一定的规则识别建筑物区域。对激光点云进行内插生成网格数据;利用植被指数限制的分水岭分割算法分割激光点云生成的数字表面模型数据,在分水岭淹没过程中引入植被指数可以较好地区分建筑物和植被区域;在区域相邻关系的基础上,利用一些准则(高程差值、尺寸和植被指数)识别建筑物区域。利用国际摄影测量与遥感
基于Kolmogorov及非Kolmogorov湍流模型,分析了大气湍流对光子轨道角动量(OAM)的散射效应,得到了探测端不同OAM模式的概率。分析了两种湍流条件下OAM编码测量设备无关量子密钥分发(MDI-QKD)的密钥生成率与最大传输距离。仿真结果表明,当光束在大气信道传输时,光束的径向强度逐渐增大,湍流对光子OAM的散射效应逐渐增强,初始OAM发散为相邻OAM模式并趋于无规则分布,探测端测得初始OAM模式的概率不断减小。大气湍流下OAM编码MDI-QKD的最大传输距离比偏振编码MDI-QKD的长约1
Developing natural “free space” frequency upconversion is essential for photonic integrated circuits. In a single-crystal lithium niobate thin film planar waveguide of less than 1 μm thickness, we achieve type I and type II mode phase-matching conditions