舰载光电指向器多轴系耦合精度分析

光电指向器的轴系精度直接影响到光电系统的整体性能指标。分析了光电指向器轴系之间精度影响关系,根据对方位轴系、俯仰轴系和视轴轴系的各项误差源分析计算出各轴系误差值,结合在安装过程中方位轴系误差与俯仰轴系误差建立数学模型,寻找方位角和俯仰角与方位轴系、俯仰轴系、视轴轴系的误差之间的耦合关系,并将三个轴系误差进行耦合后建立数学模型分析。该分析方法和结果为光电指向器的多轴系结构耦合误差设计提供了理论及工程依据。     

Review of optical fiber couplers

The present trends are toward implementation of fiber optics in data-distribution networks such as data buses, community antenna television, and local area networks. The thrust is, therefore, on high-volume and economical production of good quality optical fiber couplers. This paper reviews the various techniques for making fiber couplers. Important characteristics of various constructions and configurations together with their merits and demerits are discussed.     

Improved analysis of dispersion compensation using differential time delay for high-speed long-span optical link

Abstract

A dispersion-compensation technique using differential time delay has been analyzed for a high bit rate dispersive limited system using higher order dispersion terms. The technique is based on splitting the power spectrum into upper and lower parts, corresponding to the two modulation sidebands, and delaying one of these with respect to the other. RMS, phase deviation, dimension free chirp parameter, and figure of merit have been evaluated due to higher order dispersion terms for ideal and realistic optical communication systems. It has been shown that the transmission distance could be enhanced to fourfold, sixfold, and eightfold when the compensation has been performed using second-, third-, and fourth-order dispersion (20D, 30D, and 40D) terms.     

Classification of bernstein algebras of type (3, n - 3)

A classification of Bernstein algebras in dimensions n ? 4 has been made by Holgate in [2], however that article contains no classification up to isomorphism, the problem is solved by Lyubich in [4] when K = R or C, and by Cortes [1] in the general case. Also Lyubich has given in [5] a classification of the regular nonexceptional Bernstein algebra of type (3,n?3) and a classification but not up to isomorphism of nonregular nonexceptional Bernstein algebras of type (3,n ? 3) when K = C. The aim of this paper it to characterize, up to isomorphism, Bernstein algebras of type(2, n ? 2) and nonexceptional of type(3, n ?3) over a infinite commutative field K whose characteristic is different from 2.     

电信级Linux设备中驱动程序的研究与开发

Linux系统以其开放源代码、健壮性和高效性等优良特性,逐步被电信制造商和电信运营商所接受.本文从实际研究开发经验出发,指出当前影响电信级Linux设备稳定性和可靠性的主要因素是驱动程序的开发;然后从Linux系统相关的部分出发,进行了驱动程序开发具体规则的讨论;接着从代码编制的角度出发进行了驱动程序编程细节的讨论.     

聚合物发光器件的旋涂膜厚模型研究

聚合物膜厚的控制对于优化聚合物发光器件的光电性能是至关重要的.应用最小二乘法,通过对中心复合设计实验数据的拟合,建立了旋涂法制备聚合物薄膜的膜厚回归模型.测试结果表明:利用该模型所得到的预测膜厚与旋涂的实测膜厚基本相符.膜厚模型的建立,对于旋涂工艺中旋涂条件的选择、薄膜厚度的控制以及器件性能的优化具有一定的实用价值.     

量子器件与量子信息技术

从信息社会的发展分析提出了量子器件及量子信息技术产生和发展的必然性,介绍了谐振隧穿器件、单电子器件、电子波导晶体管等纳米电子器件及其特点,对量子激光器和量子信息技术及其性能作了简要介绍,并给出了应用前景.     

数字合成全息系统中空间光调制器DMD的研究

研究了数字合成全息系统(DSHS)中数字微反射器(DMD)的光学反射衍射混合的性质,解释了入射光入射角度任意性而不必拘泥于20°的原因,对DMD反射衍射混合成像的特性从其微结构角度进行了分析,特别注意了微反射镜的镜轴方向对图像成像区域和图像灰度的影响。针对DMD的性质设计了实验并得出了结果,用DMD作空间光调制器(SLM)实现了DSHS的设计。     

构造嵌入式Linux系统

文中首先介绍了嵌入式Linux系统的优点及其广泛应用.然后针对构造一个Linux嵌入式操作系统所面临的问题作了具体深入的分析.这些问题具体包括如何精简内核以及系统启动过程的细致分析,如何为硬件编写驱动程序.