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2009 Symposium on Photonics and Optoelectronics最新文献

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A 12-Channel Parallel 40Gb/s 0.35μm SiGe BiCMOS Laser Diode Driver 一个12通道并行40Gb/s 0.35μm SiGe BiCMOS激光二极管驱动器
Pub Date : 2009-09-01 DOI: 10.1109/SOPO.2009.5230181
Feng Xie, Zhiqun Li, Zhigong Wang
Abstract—This paper presents a 12-channel parallel 40Gb/s laser diode driver (LDD) realized in 0.35μm SiGe BiCMOS technology. The single channel works at bite rate of 3.318Gb/s. A “cross couple” capacitance cancel technique is used to increase bandwidth. To avoid substrate coupling noise brought by the adjacent channel, an isolation method for parallel amplifier is used. The measured results show the LDD can supply 5-20mA modulation current and 2-5mA bias current.
摘要:提出了一种采用0.35μm SiGe BiCMOS技术实现的12通道并行40Gb/s激光二极管驱动器(LDD)。单通道的比特率为3.318Gb/s。采用“交叉耦合”电容抵消技术来增加带宽。为了避免相邻通道带来的衬底耦合噪声,采用了并联放大器隔离的方法。测量结果表明,LDD可提供5-20mA调制电流和2-5mA偏置电流。
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引用次数: 0
A Novel Wavelength Assignment Algorithm for Distributed Optical Networks 分布式光网络中一种新的波长分配算法
Pub Date : 2009-09-01 DOI: 10.1109/SOPO.2009.5230252
Jianping Wang, Shijun Qiao, Qiwu Wu
In this paper, the wavelength assignment problem in distributed optical networks is studied. We propose an improved dynamic and priority-based wavelength assignment algorithm- DPWA (Dynamic and priority-based wavelength assignment algorithm). This proposed DPWA algorithm can effectively reduce the average blocking probability and improve the wavelength utilization ratio by adding two dynamic factors related to the present wavelength utilization state. This improved algorithm can also satisfy different wavelength resources assignment aware of different service-level connection requests, which is more necessary and important in practical networks.
本文研究了分布式光网络中的波长分配问题。我们提出了一种改进的基于优先级的动态波长分配算法——DPWA (dynamic and priority-based wavelength assignment algorithm)。提出的DPWA算法通过加入与当前波长利用状态相关的两个动态因子,可以有效降低平均阻塞概率,提高波长利用率。该改进算法还可以满足不同服务级连接请求的不同波长资源分配,这在实际网络中更为必要和重要。
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引用次数: 2
Study of a Novel ITO/AZO/SiO2/p-Si SIS Heterojunction 新型ITO/AZO/SiO2/p-Si SIS异质结的研究
Pub Date : 2009-09-01 DOI: 10.1109/SOPO.2009.5230104
Bo He, Q. Zhong, Jing Xu, Lei Zhao, Feng Li, Cheng Shen, N. Zhang, ZhengShan Yu, Yanting Yin
(1. SHU-Solar E PV Laboratory, Department of Physics, Shanghai University, Shanghai 200444, China) (2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WuHan University of technology, HuBei WuHan 430070,China) Abstract — ITO/AZO double films were deposited by RF sputtering on p-Si(100) substrate to fabricate ITO/AZO/SiO2/p-Si SIS heterojunction. The structural, optics and electrical properties of the ITO/AZO films were characterized by UV-VIS spectrophotometer, four point probe and Hall effect measurement, respectively. The results show that ITO/AZO films have good quality. The electrical junction properties were investigated by I-V measurement, which reveals that the heterojunction shows typical good rectifying behavior and great photoelectric effect. Keywords— ITO; Al-doped ZnO (AZO); Sputtering; SIS heterojunction;, current-voltage(I-V) characteristics
(1. 1 .上海大学物理系舒阳光电实验室,上海200444;摘要采用射频溅射法在p-Si(100)衬底上沉积ITO/AZO双膜,制备ITO/AZO/SiO2/p-Si SIS异质结。采用紫外-可见分光光度计、四点探针和霍尔效应测试分别表征了ITO/AZO薄膜的结构、光学和电学性能。结果表明,ITO/AZO薄膜具有良好的质量。通过I-V测量研究了该异质结的电特性,结果表明该异质结具有良好的整流性能和良好的光电效应。关键词-伊藤;al掺杂ZnO (AZO);溅射;SIS异质结;电流-电压(I-V)特性
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引用次数: 0
Modeling of Fine Tracking Sensor for Free Space Laser Communication Systems 自由空间激光通信系统精细跟踪传感器建模
Pub Date : 2009-09-01 DOI: 10.1109/SOPO.2009.5230084
Z. Hu, Zhengxun Song, S. Tong, Zhao Xin, Hongfei Song, Huilin Jiang
The optical communication networks comprised of ground stations, aircraft, high altitude platforms, and satellites become an attainable goal, however, some challenges need to be overcome. One of challenges involves the difficulty of acquisition, tracking, and pointing (ATP) a concentrated beam of light arriving from another platform across the far reach of space. To meet the pointing accuracy requirement, the basic method of tracking between the terminals of optical communication systems includes the use of a beacon laser and tracking system with a quadrant detector sensor on each terminal. In some future optical communication networks, it is plausible to assume that tracking system and communication receivers will use the same sensor. In this paper, the architecture of the fine tracking assembly of the designing optical communication terminal (OCT) is described, and the fine tracking assembly sensor is modeled based on the correlation coefficient. The simulation and experiment results of the sensor show that the detecting accuracy satisfies the design demand for our developing OCT. Keywords-modeling; quadrant detector; fine tracking sensor; optical communication networks
由地面站、飞机、高空平台和卫星组成的光通信网络已成为可实现的目标,但仍需克服一些挑战。其中一个挑战是难以获取、跟踪和指向(ATP)来自遥远太空的另一个平台的集中光束。为了满足指向精度的要求,光通信系统终端间跟踪的基本方法包括使用信标激光器和在每个终端上安装象限检测器传感器的跟踪系统。在未来的光通信网络中,跟踪系统和通信接收器将使用相同的传感器是合理的。本文描述了设计光通信终端(OCT)的精细跟踪组件的结构,并基于相关系数对精细跟踪组件传感器进行了建模。仿真和实验结果表明,该传感器的检测精度满足我国正在开发的oct的设计要求。象限探测器;精细跟踪传感器;光通信网络
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引用次数: 7
Study of Staggered Fusion Imaging Principle of CMOS Image Sensor CMOS图像传感器交错融合成像原理研究
Pub Date : 2009-09-01 DOI: 10.1109/SOPO.2009.5230210
Yongming Yan, Chunyan Qin
In order to improve the performance and the resolution of f the CMOS image sensors, a new method of staggered fusion imaging of CMOS image sensor was presented in this paper. In the staggered fusion process, four CMOS images were taken staggeringly in half pixel offset in directions of horizontal, vertical and diagonal and then were composed into one image. Theoretical analysis about the relations of pixel gray-level of original multi- images taken by CMOS image sensor and the reconstructed new image proved that resolution of the reconstructed new image of CMOS sensor can be raised by 4 times than the original images. In the simulation experiments done afterwards we did get the higher resolution reconstructed image from lower resolution images. The experimental results verify the theory analysis well. It indicated that the staggered fusion imaging method is promising for the future development of higher performance and lower price CMOS image sensors.
为了提高CMOS图像传感器的性能和分辨率,提出了一种新的CMOS图像传感器交错融合成像方法。在交错融合过程中,四幅CMOS图像在水平、垂直和对角线方向上以半像素偏移交错拍摄,然后合成为一幅图像。通过对CMOS图像传感器拍摄的原始多图像与重建后新图像的像素灰度关系的理论分析,证明了重建后新图像的分辨率比原始图像提高了4倍。在随后进行的仿真实验中,我们确实从低分辨率图像中得到了高分辨率的重建图像。实验结果很好地验证了理论分析。结果表明,交错融合成像方法对未来开发性能更高、价格更低的CMOS图像传感器具有广阔的前景。
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引用次数: 0
Crater Morphology and Thermal Injury of Bovine Shank Bone Ablated by Pulse CO2 Laser with Different Defocusing Conditions 不同散焦条件下脉冲CO2激光消融牛小腿骨的弹坑形态及热损伤
Pub Date : 2009-09-01 DOI: 10.1109/SOPO.2009.5230126
Xian-zeng Zhang, Z. Zhan, S. Xie, Qing Ye
To evaluate the zone of collateral thermal damage and crater morphology for evidence of defocus irradiation condition’s effect on the ablation of bovine shank bone with pulse CO2 laser. Bovine shank bone was divided into two groups, each group was put on a PC-controlled motorized linear drive stage which was located on the preand post-focus plane with a beam spot size of about 510 μm respectively and moved repeatedly through the focused beam. The wavelength of pulse CO2 laser was 10.64 μm, pulse repetition rate was 60 Hz. The moving speed of the stage was 20 mm/s, scan times was 6. the zone of thermal damage and crater morphology produced by pulse CO2 laser ablation were examined by light microscopy following standard histological processing. The results demonstrate that defocus irradiation condition has an important effect on ablation crater profile, crater morphology and the zone of collateral thermal damage. By selecting proper radiant exposure and focusing the beam spot not above but slightly beneath the bone surface, narrower but deeper cut with minimum collateral thermal injury can be obtained. Keywords-laser ablation; bone; CO2 laser; defocus irradiation
目的评价离焦辐照条件对脉冲CO2激光消融牛小腿骨影响的旁侧热损伤区和弹坑形态。将牛胫骨分为两组,每组分别置于位于焦前和焦后平面、光斑尺寸约为510 μm的pc控制电动直线驱动台上,并在聚焦光束中反复移动。脉冲CO2激光器波长为10.64 μm,脉冲重复频率为60 Hz。工作台移动速度为20 mm/s,扫描次数为6次。在标准组织学处理后,用光镜检查脉冲CO2激光烧蚀产生的热损伤区和火山口形态。结果表明,离焦辐照条件对烧蚀坑廓形、坑形态和附带热损伤区有重要影响。通过选择适当的辐射照射,将光束点聚焦在骨表面略下而非上方,可以获得更窄更深的切口,同时最小的附带热损伤。Keywords-laser消融;骨;CO2激光;散焦照射
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引用次数: 0
The Gain Characters and Optimization of the Double-Pass Two-Stage Ytterbium-Doped Fiber Amplifier 双通两级掺镱光纤放大器的增益特性及优化
Pub Date : 2009-09-01 DOI: 10.1109/SOPO.2009.5230311
Yan Liu, Yuanyuan Zhang, Yanshan Xiao, Yutian Lu
The amplifier chains are always the important parts of fiber amplifiers. In this paper, the gain characters of double-pass two-stage ytterbium-doped fiber amplifier were analyzed in theory. Firstly, the gain and output characters were also demonstrated when the signal power and pump power changed. Secondly, the relationship between gain and the ratio of the two fibers was analyzed when the length of fiber was given. The relationship between gain and ratio of power of two pump sources was also analyzed when the total pump power was given. At last, the optimization and the ratio of two fibers of the double- pass two-stage ytterbium-doped fiber amplifier were also discussed in detail
放大器链一直是光纤放大器的重要组成部分。本文从理论上分析了双通两级掺镱光纤放大器的增益特性。首先,分析了信号功率和泵浦功率变化时的增益和输出特性。其次,在光纤长度一定的情况下,分析了增益与两根光纤比的关系。在给定泵浦总功率的情况下,分析了两个泵浦源的增益与功率比的关系。最后,详细讨论了双通道两级掺镱光纤放大器的优化和两根光纤的比例
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引用次数: 2
Influence of Laser Distribution on the Thermal Effect of YVO4-Nd:YVO4 Composite Crystals 激光分布对YVO4- nd:YVO4复合晶体热效应的影响
Pub Date : 2009-09-01 DOI: 10.1109/SOPO.2009.5230302
Yang-Bin Xu, Jinbo Hao, P. Shi, Y. Ling
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引用次数: 0
Electrical and Optical Properties of ZAO Thin Films Prepared by Sol-Gel Dip-Coating Method 溶胶-凝胶浸涂法制备ZAO薄膜的电学和光学性能
Pub Date : 2009-09-01 DOI: 10.1109/SOPO.2009.5230067
C. Shen, Haifeng Li, Jianfeng Li, Yuzhi Xue
Firstly, undoped ZnO thin films were prepared on glass substrates by Sol-Gel dip-coating (by assembled diminutive dip-coating device),and radio-frequency magnetron sputtering respectively. X-ray diffraction(XRD). Scanning Electron Microscopy(SEM), Spectrophotometer, Surface profilometry were used to characterize their properties. The results indicated:on the glass substrates, at the same annealed temperature, the films prepared by radio-frequency magnetron sputtering had more excellent crystallization quality. Then, Al-doped (ZnO:Al(ZAO)) thin films were solely prepared on glass substrates by Sol-Gel dip-coating method(by assembled diminutive dip-coating device), Scanning Electron Microscopy(SEM), UV-Visible spectrophotometry(UV-Vis), digital four-point probe electrical resistance measurement were used to characterize their surface morphologies, transmission property, film thickness, resistance etc. The results indicated: The morphologies of ZAO thin films were more compact when the Al 3+ dopant concentration was 1.0at%; with increasing annealing temperature, the average grain size of the film increased, the resistance decreased. Under the Al 3+ dopant concentration of 1.5at%, annealing temperature of 550 0 C and annealing time of 2h , the average transmissivity of the film exceeded 70% within the visible region and resistance was 5.9×10 -2 � .cm.
首先,分别采用溶胶-凝胶浸镀(通过组装的小型浸镀装置)和射频磁控溅射在玻璃衬底上制备了未掺杂ZnO薄膜。x射线衍射(XRD)。用扫描电镜、分光光度计、表面轮廓仪等对其进行了表征。结果表明:在玻璃衬底上,在相同退火温度下,射频磁控溅射制备的薄膜具有更优良的结晶质量。然后,采用溶胶-凝胶浸渍法(通过组装的小型浸渍装置)在玻璃衬底上单独制备了掺杂Al(ZnO:Al(ZAO))薄膜,并利用扫描电镜(SEM)、紫外可见分光光度法(UV-Vis)、数字四点探针电阻测量等方法对其表面形貌、透射性能、膜厚、电阻等进行了表征。结果表明:当Al 3+掺杂浓度为1.0at%时,ZAO薄膜形貌更加致密;随着退火温度的升高,薄膜的平均晶粒尺寸增大,电阻减小。当Al 3+掺杂浓度为1.5at%,退火温度为550℃,退火时间为2h时,薄膜在可见光区平均透过率超过70%,电阻为5.9×10 -2 μ .cm。
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引用次数: 1
Reliability of High Power QCW-AlGaAs/GaAs 808nm cm-Bars 大功率QCW-AlGaAs/GaAs 808nm cm- bar的可靠性
Pub Date : 2009-09-01 DOI: 10.1109/SOPO.2009.5230296
G. Lu, Yun Huang, Y. En, Shaohua Yang, Z. Lei
The reliability, long-term performance and lifetime of high power diode lasers are important issues for pumping of solid state and fiber laser systems. In order to obtain the lifetime data of high power QCW 808nm cm-bars, we have set up a computer controlled diode array reliability experiment which can automated monitor the laser arrays 24 hours a day. Using this setup 10 high power QCW cm-bars currently being tested was operated for more than 5.4 billion shots at 25 0 C with a pulse width of 200us and a duty factor of 2%, and one cm-bars suffered sudden failure at 3.24x10 7 shots, one cm-bars had reached the failure criterion at 1.98 billion shots. The failure analysis of these two failed device were reported on this paper. Keywords-reliability, laser diode, lifetime, sudden failure, failure analysis.
高功率二极管激光器的可靠性、长期性能和寿命是固态和光纤激光器抽运系统的重要问题。为了获得大功率QCW 808nm cm棒的寿命数据,我们建立了一个计算机控制的二极管阵列可靠性实验,该实验可以24小时自动监测激光阵列。使用该装置,目前正在测试的10个高功率QCW cm-bars在250℃下,脉冲宽度为200us,占空系数为2%,运行了超过54亿次,其中1个cm-bars在3.24 × 10.7次射击时突然失效,1个cm-bars在19.8亿次射击时达到失效标准。本文对这两种失效装置进行了失效分析。关键词:可靠性,激光二极管,寿命,突然失效,失效分析。
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引用次数: 0
期刊
2009 Symposium on Photonics and Optoelectronics
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