为满足快信号测试要求,提出了利用滤波器原理设计补偿器来提高传输线带宽,以减小信号在传输过程中的畸变和损失。针对强光一号加速器测试电缆特性,设计制作了小型化的带宽补偿器。通过采用该电缆补偿技术,强光一号加速器测量电缆补偿后的传输带宽达到200 MHz,幅度为原始信号的1/3,满足了强光一号加速器测试电缆快信号传输的要求。给出了原始信号、未补偿信号及补偿后信号的比较结果,证明补偿后的信号明显比未补偿信号更接近原始信号,原始信号经电缆传输后造成的前沿损失和波形畸变通过带宽补偿器后获到了明显的补偿和修复。编制了专用补偿器设计软件,使补偿器初期设计中的极零对寻找、元器件参数计算等工作实现自动化。
快信号 传输线 滤波器 带宽补偿 强光一号 high speed signal transmission line filter bandwidth compensation QG-Ⅰaccelerator
1 桂林电子科技大学 信息与通信学院， 广西 桂林 541004
2 桂林电子科技大学 校长办公室， 广西 桂林 541004
在众多的无线传感器网络分簇路由协议中，低功耗自适应分簇(Low Energy Adaptive Clustering Hierarchy，LEACH)算法是其中比较流行的协议之一，但它并没有考虑到每个节点的能量状态，而且最优簇首数一旦确定，整个网络通信期间不再改变，因而不能更有效地提高网络的生存时间。文章在LEACH协议的基础上提出了一种改进的高能效无线传感器网络协议—EECRP(an Energy Efficient Cluster Routing Protocol)。仿真结果表明，与LEACH相比，EECRP具有更好的能量有效性，并且提高了无线传感器网络的寿命。
无线传感器网络 低功耗自适应分簇 分簇 系统寿命 WSN LEACH clustering system lifetime
State Key Lab. on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy ofSciences, Beijing, 100083, China
Author Affiliations
Abstract
1 State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083
2 State Key Laboratory on Integrated Optoelectronics, Department of Electronic Engineering, Tsinghua University, Beijing 100084
Equilateral triangle semiconductor microcavities with tensile-strained InGaAsP multi-quantum-well as the active region are fabricated by the inductively coupled plasma (ICP) etching technique. The mode characteristics of the fabricated microcavities are investigated by photoluminescence, and enhanced peaks of the photoluminescence spectra corresponding to the fundamental transverse modes are observed for microcavities with side lengths of 5 and 10 μm. The mode wavelength spacings measured experimentally coincide very well with those obtained by the theoretical formulae.
140.3410 laser resonators 140.4780 optical resonators 140.5960 semiconductor lasers 250.5230 photoluminescence Chinese Optics Letters
2003, 1(8): 08472
