DWDM信道光谱基于GPIB的测试系统

阐述了一种用VisualBasic编程,基于GPIB(通用接口总线)的软件测试系统。系统的功能是模拟ASE(宽谱光源)光源和光谱仪的作用,实现计算机控制自动测试DWDM(波分复用器)的某一个信道的光谱。介绍了自动测试系统的构成,详细阐述了软件的设计思想。     

交叉耦合系数对光分插复用器输出光谱的影响

光分插复用器是集成光学的重要单元器件之一。针对光分插复用器在十字交叉处存在损耗问题,研究了交叉耦合系数对信道波导与微环间距和各信道输出光谱的影响。用耦合模理论推导了各信道输出光谱的解析表达式,并对光谱图进行分析。研究发现,信道波导与微环间距为66.16nm时,交叉耦合系数最小,交叉耦合系数的存在使谱线呈法诺共振曲线。由对数值解和仿真解的比较,得出仿真解与数值解吻合得很好。     

基于DWDM技术的光纤光栅压力测试仪的研究

现有的压力测试仪难以适应石油石化等对高等级防爆要求的特殊行业的技术需求,文中采用独立设计的波登管光纤光栅压力传感器与密集型波分复用器(DWDM)解调技术相结合,并与微光探测技术、光电开关技术进行有效集成,同时借助自行开发的信号处理软件,研制出一种完整的全光纤压力测试仪。该测试仪系统集成性强、自动化程度高,压力测试仪的传感器波长调谐灵敏度为0.28 nm/MPa,引用误差为1%。     

英特尔以硅光子试制光纤接口实现50Gbit／s的数据传输速度

美国英特尔使用以硅技术制造光收发元件和光波导的“硅光子”,试制出了数据传输速度最高达50Gbit／s的光纤接口（光纤链路）。 集成有激光器、光调制器和波分复用器等的发送Ic,以及集成有解复用器和光探测器等的接收Ic,均由硅制成。据称,是以光纤连接了安装在树脂底板上的发送Ic和接收Ic模块,并确认了50Gbit／s的数据传输速度。     

浅谈铁路DWDM网络的应用与运维

自20世纪90年代DWDM系统商用以来,已迅速成为长途传输的主流方式.2000年以来,铁路以8横8纵为基础,相继建成了五大DWDM基础光传输网络环.如今伴随DWDM技术的广泛普及,传输网的维护与传统方式相比也有了较大区别.通过分析DWDM优势,以及铁路应用现状,结合相关文献和工作经验与大家讨论一下几种DWDM故障判断与定位的常用方法.     

高精度光学薄膜的制造

论述了 DWDM、GFF、CWDM等薄膜的制造 ,特别给出了 1 0 0 GHz　 DWDM的设计和误差分析。     

DWDM双边缘解调技术对光纤光栅压力传感器的影响

利用密集型波分复用器实现光纤光栅压力传感器的高灵敏度解调,通过实验得到双通道波分复用器2个边翼的透射谱分布,并构建了分段连续函数方程,实现了双边缘解调,解调的范围比单边缘扩大一倍,实验表明在0~3.6MPa范围内,该测试系统的引用误差小于1%,强度分辨力高于稀疏型波分复用器2个数量级。     

一种新型的模式复用器

为了进一步提高光纤通信传输容量以及突破单模光纤的容量极限,提出了一种新型的模式复用器结构,该结构可以将单模光纤中的纤芯基模转换为双模光纤中的高阶模。基于耦合模理论,通过MATLAB仿真与计算,证明此复用器的模式转换率可以达到100%,转换带宽为10nm。由于其良好的转换效率和带宽,此复用器装置可以用于模分复用传输系统中来增加光纤通信的传输容量。     

高精度光学薄膜的制造

论述了DWDM、GFF、CWDM等薄膜的制造,特别给出了100GHzDWDM的设计和误差分析.     

高精度光学薄膜的制造

论述了DWDM、GFF、CWDM等薄膜的制造,特别给出了100GHzDWDM的设计和误差分析.     

Measuring manufacturing capability for couplers and wavelength division multiplexers

The couplers and wavelength division multiplexers have been widely used in high-speed, high-volume image data transmission systems to provide sufficient bandwidth and smaller channel spacing for greater throughput. In this paper, we develop a method for measuring the manufacturing capability of a process making couplers and wavelength division multiplexers. The proposed method measures the process capability of reproducing product items meeting the manufacturing specifications where multiple product quality characteristics are involved, including the polarization dependent loss, and the insertion loss, which are critical in fiber-optic transmission quality.     

用于光纤光栅传感的低成本高分辨率多通道波长解调仪

本文报道一种用于光纤光栅传感的低成本高分辨率多通道波长解调仪。基于薄膜滤波技术的密集波分复用模块已被广泛用于光纤通信系统中，在本文中，采用已商品化的薄膜密集波分复用模块同时完成了以波分复用方式连接的多个光纤光栅传感器的信号分离与波长解调功能，研究了一种结构简单、低成本、高分辨率的光纤光栅传感系统。该传感系统的特点是可用于多通道动态测量。本文将具体介绍一种旧通道传感系统，该系统在3kHz频率下的动态应变的分辨率优于1nε√Hz。     

P-Q伺服阀及力控制系统的键图建模

本文介绍了P-Q伺服阀的结构和工作原理,在着重分析了伺服阀各部分的流量方程和力(矩)平衡方程基础上,运用键图对伺服阀进行建模。采用P-Q伺服阀控制的电液力控制系统具有很多优点,建立其系统键图模型,并通过仿真分析和试验对比,验证了P-Q伺服阀及电液力控制系统的键图模型是正确的。     

HOM系列高精度光学膜厚监控系统的研制

叙述了新研制的适用于 DWDM窄带滤光片成膜控制的高精度光学膜厚监控系统。该系统在光谱带宽 0 .1 nm条件下 ,暗噪声小于± 0 .0 0 5 % ,性能优于目前的报道。使用它已成功地实现了 1 0 0 GHz,5 0 GHz DWDM窄带滤光片全自动成膜监腔。由其派生出的HOM系列的其他类型光学膜厚监控系统 ,可适用于不同的优质膜的过程控制     

Analysis of design principles of silicon multiplexer circuits for multielement infrared focal plane arrays

Design principles of silicon multiplexers for linear and matrix infrared (IR) focal plane arrays (FPAs) are considered. Silicon multiplexers intended for operation with multielement mercury-cadmium-tellurium (MCT) photodiode detectors, with multielement photoresistor detectors based on multilayer structures with quantum wells, and with other types of photodetectors sensitive to radiation in the IR ranges from 3 to 5 and from 8 to 16 μm, are discussed. The type and size range of the multiplexers includes 19 models that differ in frame sizes, input circuits, charge capacity, and cell pitch. Around the designed multiplexers, hybrid and monolithic FPAs of various formats for medium and far IR ranges with a rather high temperature resolution (< 0.02 K) have been developed.     

320 × 256 Silicon multiplexers for IR focal plane arrays based on MCT diodes

Principles of designing and functioning the 320 × 256 frame and row integration matrix multiplexers are considered. The temperature resolution of the MCT IR FPA and the designed multiplexers is analyzed.     

考虑时间变量时单十字万向节的运动学研究

单十字万向节是一种常用的联轴器,用于联接相变两轴以传递运动和动力,其运动特性直接影响机械传动系统的性能。考虑轴交角随时间的周期变化,对单十字同节的运动特性进行了较为详细的研究,并对传动比进行了频域分析,得出一些不机于轴交角为常数时的新结论。     

叉车静压传动系统研究与应用

通过对越野叉车和箱内作业叉车静压传动系统的设计研制，阐述了静压传动系统高速方案和低速方案的布置形式和工作原理。设计中增加了液压油冲洗回路、压力滤油器和压力切断装置，解决了静压传动系统应用设计中的问题。     

Surface electrode switching of a 16-electrode wireless EIT system using RF-based digital data transmission scheme with 8 channel encoder/decoder ICs

A Radio Frequency (RF) based digital data transmission scheme with 8 channel encoder/decoder ICs is proposed for surface electrode switching of a 16-electrode wireless Electrical Impedance Tomography (EIT) system. A RF based wireless digital data transmission module (WDDTM) is developed and the electrode switching of a EIT system is studied by analyzing the boundary data collected and the resistivity images of practical phantoms. An analog multiplexers based electrode switching module (ESM) is developed with analog multiplexers and switched with parallel digital data transmitted by a wireless transmitter/receiver (T_x/R_x) module working with radio frequency technology. Parallel digital bits are generated using NI USB 6251 card working in LabVIEW platform and sent to transmission module to transmit the digital data to the receiver end. The transmitter/receiver module developed is properly interfaced with the personal computer (PC) and practical phantoms through the ESM and USB based DAQ system respectively. It is observed that the digital bits required for multiplexer operation are sequentially generated by the digital output (D/O) ports of the DAQ card. Parallel to serial and serial to parallel conversion of digital data are suitably done by encoder and decoder ICs. Wireless digital data transmission module successfully transmitted and received the parallel data required for switching the current and voltage electrodes wirelessly. 1 mA, 50 kHz sinusoidal constant current is injected at the phantom boundary using common ground current injection protocol and the boundary potentials developed at the voltage electrodes are measured. Resistivity images of the practical phantoms are reconstructed from boundary data using EIDORS. Boundary data and the resistivity images reconstructed from the surface potentials are studied to assess the wireless digital data transmission system. Boundary data profiles of the practical phantom with different configurations show that the multiplexers are operating in the required sequence for common ground current injection protocol. The voltage peaks obtained at the proper positions in the boundary data profiles proved the sequential operation of multiplexers and successful wireless transmission of digital bits. Reconstructed images and their image parameters proved that the boundary data are successfully acquired by the DAQ system which in turn again indicates a sequential and proper operation of multiplexers as well as the successful wireless transmission of digital bits. Hence the developed RF based wireless digital data transmission module (WDDTM) is found suitable for transmitting digital bits required for electrode switching in wireless EIT data acquisition system.