CO2激光器及其在无线光通信中的应用

主要介绍了CO2激光器的基本原理及其在无线光通信中的应用,并给出了无线光通信系统的结构简图。通过分析雾对激光传输的影响,可以得出CO2激光器产生的光源能够更好地适应恶劣的大气环境,提高无线光通信系统的性能。     

光纤激光器及其泵浦源设计

光纤激光器在光通信、传感技术、医疗、工业加工等领域有着广泛的应用,是未来非常重要的激光光源。本文简要介绍了光纤激光器的原理及特点,并给出了一种环形腔光纤激光器的结构。随后介绍了光纤激光器泵浦源驱动电路的设计方案。     

光纤激光器及其泵浦源设计

光纤激光器在光通信、传感技术、医疗、工业加工等领域有着广泛的应用，是未来非常重要的激光光源．本文简要介绍了光纤激光器的原理及特点，并给出了一种环形腔光纤激光器的结构。随后介绍了光纤激光器泵浦源驱动电路的设计方案。     

未来的全光通信

激光技术的出现和发展,为光通信提供了理想的光源——激光器。由于激光器产生的激光亮度高,方向性、单色性和相干性好,因而传输距离远,便于调制和接收,是一种极好的信息载体。激光器的出现及后来低损耗光纤的产生,使长期停滞不前的光通信在70年代重新崛起,     

空间光通信用半导体激光器

自由空间激光通信技术是未来空间基础设施的关键技术之一,作为其光源的半导体激光器,有特殊的要求,主要是适合大气传输的低损耗波长窗口、超大功率、窄波束宽度,以及高数据速率。主要介绍自由空间激光通信对半导体激光器性能的要求,以及目前用于空间光通信的半导体光源的开发进展。     

星间激光链路光源探讨

星间光通信要求光源具有输出功率高，调制速率快的特点。目前的星间光通信系统大多采用半导体激光器。近年来，高功率光纤激光器得到快速发展，并以其优异的性能在很多领域正逐步取代半导体激光器。本文着重分析了半导体激光器和光纤激光器的性能，提出了光纤激光器用于星间光通信的可行性。     

用于光通信的可调谐激光光源

随着高速大容量光通信系统的迅猛发展 ,可调谐激光光源在 DWDM中的应用将越来越重要。文中介绍了近年来应用于光通信领域的一些可调谐激光光源 ,对不同结构的可调谐激光器进行了初步的分析比较 ,并对国外已出现的一些比较成熟的可调谐激光器产品做了一些简要的介绍。     

基于C8051F通信用大功率激光器驱动电源仿真与设计

结合半导体激光器的工作特性和大气无线激光通信编码技术,设计了一种低功耗、便携式通信用大功率脉冲半导体激光器驱动电源,该电源采用脉冲半导体激光器作为通信光源,以C8051F为控制芯片、CPLD为RS信道编码芯片实现信息在激光载体上的高速率大气传输.给出电源硬件设计方法.通过参数仿真与实验验证,该激光器电源具有通信频率可调、输出功率可调、操作方便、性能稳定等优点.     

星间激光链路光源研究

星间光通信要求光源具有输出功率高，调制速率快的特点。目前的星间光通信系统大多采用了半导体激光器。近年高功率光纤激光器得到很快发展，以其优异的性能在很多领域正逐步取代半导体激光器。文章分析了几种激光器的性能，验证了光纤激光器用于星间光通信的可行性。     

可调激光器技术及其在光标记交换中的应用

可调激光器是WDM光网络系统的理想光源,同时可以用作光分组交换网络结构器件、接入网波长路由器等方面,是当今光通信技术的研究热点之一。介绍了一些常用类型的可调激光器的工作原理和结构,并介绍了在光标记交换中使用可调激光器实现光标签头的产生和再生方案。     

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.     

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.     

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.     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first