垂直腔面发射激光器的小信号电路模型和调制特性

给出了垂直腔面发射激光器的小信号电路模型和调制特性,调制特性用解析计算和电路模型模拟两种方法得到,解析计算和电路模型模拟的结果一致,实验证实了电路模型的正确性.     

垂直腔面发射激光器的小信号电路模型和调制特性

给出了垂直腔面发射激光器的小信号电路模型和调制特性,调制特性用解析计算和电路模型模拟两种方法得到,解析计算和电路模型模拟的结果一致,实验证实了电路模型的正确性.     

单模半导体激光器的非线性失真特性的电路模拟

本文提出了一种基于小信号等效电路的半导体激光器非线性电路模型，该模型使激光顺的调制响应和非线性特性以及其它相关电子电路的非线性特性可统一地通过通用电路分析软件来分析和计算。运用此模型对一单模激光器的二阶谐波与三阶交调失真特性进行了分析，结果与已报道的理论和实验结果一致。     

注入锁定半导体激光器的电路模型及其调制特性分析

本文给出了注入锁定半导体激光器ＬＤ小信号电路模型，使得对注锁ＬＤ的调制特性可以用通用电路分析软件进行分析，运用此模型对注入锁定ＬＤ的调制特性进行了分析。模型的稳态分析结果与已报导的理论和实验一致。     

4H-SiC功率MESFET直流I-V特性解析模型

提出了一种改进的4H-SiC MESFET大信号直流解析模型。该模型基于栅极下面电荷的二维分布进行分析,在考虑电场相关迁移率、速度饱和及沟道内电荷堆积的基础上,计入沟道长度调制效应,建立基于物理的沟道长度调制效应模型。计算结果表明,计入沟道长度调制效应后的直流模型在饱和区与实测的I-V特性较为吻合。     

一种非理想直流变换器的建模与仿真

应用平均法导出了考虑各种非理想因素时Buck-boost变换器的直流稳态和小信号动态模型，给出了仿真算例。所得模型具有实用性，依据该模型，代入电路参数后经简单计算或编程，即可快速获得电路稳态和动态特性的解析解。     

基于解析电导率模型的相变存储器SPICE模型

在相变存储器的外围电路设计中,相变存储单元的电路模型是连接器件与电路的桥梁。在本文中,提出了一种基于解析电导率模型的相变存储器电路模型,与前面的工作相比,该模型利用解析电导率模型代替了使用传统模型中需要利用测试结果建模的缺点,可以通过材料的参数计算相变存储单元的电阻,能够反映相变材料中的载流子传输特性。同时,基于等温假设,提出了解析温度模型,并基于JMA方程建立的相变动力学模型,结果表明,该模型能够进行相变存储单元瞬态与稳态电路仿真,并与测试结果符合较好。     

PSM开关变换器的大信号模型与瞬态特性

针对传统PWM调制具有轻载下效率低的缺点,论文作者提出一种新的高效调制模式——脉冲跨周调制PSM模式.本文对这种新的PSM开关变换器调制模式进行了包括大信号解析模型、离散模型和相平面模型的大信号建模工作,并借助变换器的解析解、离散模型和相平面分析法对PSM变换器开环/闭环系统的瞬态响应特性进行了分析.研究表明PSM变换器不仅较PWM调制模式轻载下效率高,而且具有响应速度更快,抗干扰性更好的特点.     

半导体激光器调制特性的人工神经网络仿真

对半导体激光器调制特性进行了理论分析，通过研究半导体激光器调制特性的速率方程，推导了调制特性的解析表达式。用广义回归神经网络建立了激光器调制特性的神经网络模型，通过训练好的神经网络模型对激光器调制特性进行了深入分析，并对激光器结构进行了仿真设计。模型输出结果与理论分析的结果相吻合，且该方法具有速度快、精度高、重复性好等优点。研究结果表明，利用神经网络模型可以对半导体激光器性能进行分析，并确定半导体激光器的一些结构尺寸。     

分段线性脉冲神经元模型的动力学特性分析

 结合Hodgkin-Huxley神经元模型的动力学特性与Integrate-and-Fire神经元模型的解析特性,提出了一种新的二维分段线性脉冲神经元模型.该模型的优点在于既可通过分叉理论对兴奋性系统进行定性描述,又可通过状态变量的解析式对神经元行为进行定量分析.通过详细的分析,发现该模型具有许多一维Integrate-and-Fire神经元模型所不具有的新的神经计算特性.在实验中,应用该模型模拟了大部分已知皮层神经元的脉冲和簇放电行为.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks