10 GHz再生锁模光纤激光器获得光纤超连续谱的研究

报道了利用10GHz再生锁模光纤环形激光器（RML-FRL）获得波长在1528～1563nm连续可调、脉宽为4．6～5．8ps的短脉冲输出作为高稳定的光纤超连续（SC）谱泵浦源。对RML-FRL输出的脉冲直接放大泵浦4．5km色散位移光纤（DSF），得到20dB带宽46．08nm的SC谱输出，经阵列波导光栅（AWG）谱切片后，得到间隔100GHz、中心波长符合ITUT标准的30信道输出，脉宽在6．5～7．8ps，示波器显示任意信道的抖动均值小于1．4ps。     

利用DSF型单向锁改进MXA-300型采煤机调高系统

山西潞安环保能源开发股份有限公司王庄煤矿在 6 10 5工作面使用DSF型单向锁对MXA - 30 0型采煤机的调高系统进行了改造 ,很好地预防了其在运转过程中常出现的摇臂下滑、自落现象 ,为工作面正常生产创造了条件。     

Using Anfis with circular polygons for impulsive noise suppression from highly distorted images

In this paper, a novel approach is presented to the restoration of images corrupted by impulsive noise (IN), with a new nonlinear IN suppression filter, entitled circular polygons based adaptive-fuzzy filter (CF). The proposed filter is based on statistical impulse detection and nonlinear filtering which uses adaptive-network-based fuzzy inference system (Anfis) as a missed data interpolant over the circular polygons and provides estimates for the original intensity values of corrupted pixels. Impulse detection is realized by using the chi-square based goodness-of-fit test, which yields a decision about the impulsivity of each pixel. Extensive simulations were realized to demonstrate the capability of CF and they reveal that the proposed filter achieves a better performance than the other filters mentioned in this paper in the cases of being effective in noise suppression and detail preservation, also when the images are highly corrupted by IN.     

增益平坦的多波长泵浦宽带拉曼光纤放大器

在分析拉曼光纤放大器(RFA)原理的基础上,采用遗传算法对 5波长后向泵浦拉曼光纤放大器的波长和功率进行了优化设计。实验采用位于5个波长处的7个泵浦激光器和100.8 km的色散位移光纤,实现了带宽为90 nm、开关增益为15.55 dB、增益平坦度为0.87 dB的拉曼放大,其平均有效噪声系数为-3.5 dB,与理论分析结果一致。     

基于自相位调制原理的光纤非线性系数测量

光纤的非线性效应对于光纤通信具有重要意义.准确测量光纤的非线性系数是有效利用或抑制各种非线性效应的基础.介绍了利用自相位调制测量非线性系数的原理并探讨了对实验装置的具体要求;给出了色散位移光纤(DSF)和普通单模光纤(SMF)的实测结果;结果表明,无论使用输出光谱左侧还是右侧的主瓣和旁瓣光强比值I0/I1均可计算出准确数值;最后讨论了偏振和色散对测量结果的影响.     

醋酸纤维高速纺丝成形工艺研究

通过研究醋酸纤维的纺丝生产流程,探索纺丝原液细流成形条件对生产过程及产品质量的影响,实现纺丝速度由535m/min提高到600m/min,同时改善了醋纤的产品质量。     

双层皮玻璃幕墙建筑的能耗分析和优化设计

介绍了双层皮玻璃幕墙的研究背景及构造。从理论上分析了气流排热、壁面对流及太阳辐射等因素对建筑能耗的影响。应用EnergyPlus分析了通风腔风速、遮阳策略、朝向和结构参数对建筑能耗的影响。     

基于光纤XPM光学生成UWB信号的方法

提出了一种基于色散位移光纤(DSF)的交叉相位调制(XPM)效应的超宽带(UWB)光学生成方法。该方法首先利用DSF的XPM效应实现高功率的高斯泵浦光对低功率的直流探测光的交叉相位调制,然后利用光纤布拉格光栅(FBG)对探测光进行鉴频,实现相位调制到强度调制的转换,从而获得单周期UWB信号。利用光子仿真软件对方案进行了仿真实验,得到了中心频率分别为7GHz和6.95GHz、相对带宽分别为143%和145%的UWB信号,验证了所提方法的可行性。同时,研究了输入信号脉冲宽度、FBG的反射率、鉴频器的类型对产生的单周期UWB脉冲信号波形和频谱的影响。仿真实验的结果表明,该方案对输入信号脉冲宽度不是过宽的情况下具有良好的容忍度,光学高斯带通滤波器、波分复用器和FBG等光滤波器均可作为鉴频器,采用FBG优点是可通过改变反射率灵活地调整产生的UWB脉冲信号的波形。     

Energy performance assessment of double-skin façade with thermal mass

To mitigate the overheating problem in the warmer seasons, and thereby improve thermal performance and energy efficiency of the double-skin façade (DSF) system, this study introduced an innovative design approach involving the integration of passive thermal mass technique with the air channel of the conventional DSF. To assess the contribution of this integration to energy efficiency of the system, a numerical model was developed, capable of determining the thermal performance of the conventional DSF. The numerical model is composed of airflow and thermal models. This paper briefly describes the development of the models as well as the models’ verifications. Models were then used to carry out a series of parametric studies to investigate the effect of thermal mass on the energy performance of the integrated system.The simulation results revealed that mechanically ventilated DSF can save energy based on configuration from 21% to 26% in summer and from 41% to 59% in winter as compared to conventional DSFs without thermal mass. The results also showed the total saving for a naturally ventilated DSF is negligible year-round.     

基于DSF架构的USB设备虚拟

USB(Universal Serial Bus)已经成为电子产品对外接驳接口中最为流行的总线标准,针对Window操作系统下USB设备驱动预先开发的需求,介绍了如何使用DSF(Device Simulation Framework:设备虚拟框架)虚拟在物理上并不存在的USB设备.开发该虚拟设备的主要过程包括:基于一种...