适应高温工作的大功率高效率1.3μmInAsP压应变MQW激光器

使用最佳结构的１．０５μｍＧａＡｓＰ势垒层的１．３μｍＩｎＡｓＰ压应变ＭＱＷ激光二极管，在９０℃时达到了３７ｍＷ的高输出功率和超过０．５５Ｗ／Ａ的高斜率效率。     

掺铒光纤放大器泵浦源用980nm量子阱激光器

我们利用分子束外延（ＭＢＥ）方法研制出了高质量的ＩｎＧａＡｓ／ＧａＡｓ／ＡＩＧａＡｓ应变量子阱激光器外延材料，其最低的阈值电流密度可达到１４０Ａ／ｃｍ２，激发波长在９８０ｕｒｎ左右．通过脊型波导结构的制备，获得了高性能的适合于掺铒光纤放大器用的９８０ｕｒｎ量子阱激光器泵浦源，其典型的阈值电流和外微分量子效率分别为１５ｍＡ和０．８ｍＷ／ｍＡ，基横模的输出功率大于８０ｍＷ，器件在５０℃，８０ｍｗ的恒功率老化实验表明，器件具有较好的可靠性．通过与掺铒光纤的耦合，其组合件出纤功率可达６０ｍＷ以上．     

完全 MBE 生长的内含吸收型光栅 GaAlAs／GaAs 多量子阱增益耦合型分布反馈式半导体激光器

我们首次完全采用ＭＢＥ技术成功地制作了内含吸收型光栅的ＧａＡＩＡｓ／ＧａＡｓ量子阶增益耦合型分布反馈式半导体激光器．激光器在室温下的激射波长为８６０ｕｍ，单模单端输出光脉冲峰值功率超过２０ｍＷ．器件在至少０℃到８０℃的范围内始终保持单纵模激射．作为初步结果，条宽为５～６μｍ的氧化物条形结构器件的脉冲工作阈值电流约为７００ｍＡ．     

钛宝石激光泵浦的1.06μm和1.34μm高效连续掺钕氟钒酸锶激光器

利用钛宝石激光作为泵浦源,实现了掺钕氟钡酸锶（ＮｄＳＶＡＰ）晶体在１．０６μｍ和１．３４μｍ的高效连续激光运转。在１．０６μｍ和１．３４μｍ处得到的最低泵浦阈值分别为２ｍＷ和２．４ｍＷ,最高斜效率分别为４９．４％和３７．４％,最大输出功率分别为３３６ｍＷ和１６５ｍＷ。     

高效94GHz0.15μm InGaAs／InAlAs／InP单片功率HEMT放大器

介绍了采用栅长为０．１５μｍ的钝化Ｉｎ０．５３Ｇａ０．４７Ａｓ／Ｉｎ０．５２Ａｌ０．４８Ａｓ／ＩｎＰＨＥＭＴ的高效Ｗ波段功率单片微波集成电路（ＭＭＩＣ）。０．１５×３２０μｍ单级ＩｎＰ功率ＨＥＭＴＭＭＩＣ放大器在９４ＧＨｚ时的最大功率附加效率为２３％，输出功率为４０ｍＷ，功率增益为４．９ｄＢ。当电源偏置成更高的输出功率时，在９４ＧＨｚ处可得到功率附加效率为２０％的５４ｍＷ的输出功率。这些结果表明，在此频率下，这样的效率和输出功率是迄今为止所有报道中最佳的。     

2 μm波段InGaAsSb/AlGaAsSb宽条多量子阱激光器

报道了用ＭＢＥ生长的ＩｎＧａＡｓＳｂ／ＡｌＧａＡｓＳｂ多量子阱材料做成的宽条激光二极管的性能。室温下以脉冲方式工作，实现了８３ｍＷ的峰值功率输出，阈值电流为２５０ｍＡ，典型峰值波长为２．００μｍ左右。     

光泵外腔面发射InGaAs／InP半导体激光器

本文报道了外腔面发射ＩｎＧａＡｓ／ＩｎＰ半导体激光器的实验结果．利用面发射ＩｎＧａＡｓ／ＩｎＰ半导体材料作为激活介质，采用锁模（或连续）Ｎｄ＋３：ＹＡＧ激光（波长１．３２μｍ）泵浦．平均输出功率达１８７ｍＷ，同步泵浦获得最窄脉冲宽度为６ｐｓ，输出波长１．５μｍ，利用衍射光栅对脉冲进行压缩获得１８１ｆｓ超短光脉冲．     

NdLMA激光器的附加脉冲锁模

用半导体激光泵浦ＮｄＬＭＡ激光器在１．０５４μｍ波长处获得连续６５０ｍＷ的激光输出，斜效率达３３％。利用一个包含光纤的非线性外腔，实现了自启动的ＮｄＬＭＡ附加脉冲锁模，输出平均功率为５８ｍＷ的接近带宽转移极限的１．８ｐｓ超短脉冲激光     

1.3μm波长InGaAsP／InP脊形波导激光器

本文介绍用一次液相外延制备五层结构的晶体材料及自对准的工艺方法研制成功的１．３μｍＩｎＧａＡｓＰ／ＩｎＰ脊形波导（ＲＷＧ）结构的激光器。用有源区向上的装架方式，在２５℃时，激光器最小连续波（ＣＷ）阈值电流为２３ｍＡ，且均匀性较好；最大单面光电转换效率为０．１８ｍＷ／ｍＡ；在６５℃的环境温度下其最大发射功率仍大于１０ｍＷ；用标准单模光纤耦合，２５℃下阈值电流为２０ｍＡ的入纤光功率大于１．５ｍＷ。     

1.3μm InGaAsP/InP大功率短脉冲SPB-BC激光器

本文在传统的掩埋新月型激光器的基础上，提出了一种１．３μｍＩｎＧａＡｓＰ／ＩｎＰ大功率激光器结构－选择性质子轰击掩埋新月型激光器（ＳＰＢ－ＢＣ）．文中对其制作过程及特性进行了详细的描述和测量．它的最低阈值电流小于１０ｍＡ，对于ｎ－ＩｎＰ衬底，它的最大输出功率为６５ｍＷ，ｐ－ＩｎＰ衬底，最大输出功率为８０ｍＷ．在重复频率为２．１ＧＨｚ时，测得光脉冲的半宽度（ＦＷＨＭ）为１８ｐｓ．     

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.     

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.     

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