利用WDM光纤耦合器的光纤光栅传感解调技术

根据WDM光纤耦合器波长解调方案的工作原理、偏振特性以及影响系统波长分辨力的因素,提出一种改进的利用WDM光纤耦合器的光纤光栅传感解调技术.该技术在原技术的基础上,采用偏振控制器控制入射光偏振状态,提高了解调的精度和稳定性.对WDM光纤耦合器的多次波长扫描结果表明,采用偏振控制器后,其波长误差可减小到5pm左右.实验采用1540/1560nm的WDM光纤耦合器对单点光纤光栅应变传感器进行静态解调,结果表明:按此技术开发的解调系统具有0.01nm波长分辨力和10nm的波长线性解调范围.

Investigation on integrated high speed DFB light source and narrow bandwidth RCE photodetector for WDM fiber communication network application

Electroabsorption (EA) modulator integrated with partially gain coupling distributed feedback (DFB) lasers have been fabricated and shown high single mode yield and wavelength stability. The small signal bandwidth is about 7.5 GHz. Strained Si1-chiGechi/Si multiple quantum well (MQW) resonant-cavity enhanced (RCE) photodetectors with SiO2/Si distributed Bragg reflector (DBR) as the mirrors have been fabricated and shown a clear narrow bandwidth response. The external quantum efficiency at 1.3 mum is measured to be about 3.5% under reverse bias of 16 V. A novel GaInNAs/GaAs MQW RCE p-i-n photodetector with high reflectance GaAs/ALAs DBR mirrors has also been demonstrated and shown the selectively detecting function with the FWHM of peak response of 12 nm.

基于WDM模型的PCI卡驱动程序设计

基于WDM模型的PCI卡驱动程序设计,是建立Windows操作系统下数据采集系统面临的关键问题。详细分析了WDM驱动程序的工作原理。以PCI9113A数据采集卡为例,提出了利用Microsoft公司的DDk实现Windows2000操作系统下驱动程序的有效开发方法。讨论了驱动程序的测试和封装。

WDM驱动程序在HIRFL-CSR电源控制系统中的应用

为解决基于Web多层架构的HIRFL-CSR电源控制系统的可靠性和实时性差的问题,利用直接在WDM驱动程序中处理被控设备异常的方法来提高控制系统的可靠性和实时性, WDM驱动程序利用WMI主动向应用程序报告被控设备的异常,简化了控制系统的软件结构,从而进一步提高控制系统的实时性和控制效率。

Windows2000的管理机制(WMI)和WDM驱动程序的研究与应用

主要介绍了一种新型的企业管理和设备测试系统。首先描述了WMI的优点及其体系结构。然后介绍怎样把WMI机制和WDM驱动程序结合起来。最后给出一个访问WMI的标准的方法。

Quasi-isochoric ion beam heating using dynamic confinement in spherical geometry for X-ray scattering experiments in WDM regime

Extreme states of matter such as Warm Dense Matter “WDM” and Dense Strongly Coupled Plasmas “DSCP” play a key role in many high energy density experiments, however creating WDM and DSCP in a manner that can be quantified is not readily feasible. In this paper, isochoric heating of matter by intense heavy ion beams in spherical symmetry is investigated for WDM and DSCP research: The heating times are long (100 ns), the samples are macroscopically large (mm-size) and the symmetry is advantageous for diagnostic purposes. A dynamic confinement scheme in spherical symmetry is proposed which allows even ion beam heating times that are long on the hydrodynamic time scale of the target response. A particular selection of low Z-target tamper and x-ray probe radiation parameters allows to identify the x-ray scattering from the target material and use it for independent charge state measurements Z* of the material under study.

Performance analysis of a metro WDM ring networks with variable-length packets under symmetric and asymmetric traffic

In this paper, we discuss and evaluate two proposed metro wavelength division multiplexing (WDM) ring network architectures for variable-length packet traffic in storage area networks (SANs) settings. The paper begins with a brief review of the relevant architectures and protocols in the literature. Subsequently, the network architectures along with their medium access control (MAC) protocols are described. Performance of the two network architectures is studied by means of computer simulation in terms of their queuing delay, node throughput and proportion of packets dropped. The network performance is evaluated under symmetric and asymmetric traffic scenarios with Poisson and self-similar traffic. (C) 2011 Elsevier Inc. All rights reserved.