基于现场总线的TSI和TDM一体化设计

本文率先提出了采用现场总线技术将汽轮机监视装置和瞬态数据管理系统整合的思想.设计了汽轮机监视装置和瞬态数据管理一体化系统的体系结构,通过基于CAN的令牌总线网络解决了系统间互联通信中的关键技术问题--介质共享访问解决方案.     

基于现场总线的TSI和TDM一体化设计

本文率先提出了采用现场总线技术将汽轮机监视装置和瞬态数据管理系统整合的思想。设计了汽轮机监视装置和瞬态数据管理一体化系统的体系结构，通过基于CAN的令牌总线网络解决了系统间互联通信中的关键技术问题——介质共享访问解决方案。     

光孤子通信及其发展动态

介绍了光孤子的形成原理和光孤子通信系统，总结了光孤子通信发展动态，展望了光孤子通信技术发展前景。     

TDM系统在大型发电机故障诊断中的应用

通过TDM(Turbine Diagnosis Management)系统对多台600MW发电机异常振动进行了分析和诊断.利用TDM记录的历史数据,准确判断集电环转子的轴承支撑刚度恶化及发电机转子匝间短路故障。     

Error models for long-distance qubit teleportation

A recent proposal for realizing long-distance, high-fidelity qubit teleportation is reviewed. This quantum communication architecture relies on an ultrabright source of polarization-entangled photons plus a pair of trapped-atom quantum memories, and it is compatible with long-distance transmission over standard telecommunication fiber. Models are developed for assessing the effects of amplitude, phase, and frequency errors in the entanglement source, as well as fiber loss and imperfect polarization restoration, on the throughput and fidelity of the system.     

脑电图机的WDM驱动程序设计与分析

本文分析了WDM驱动程序的基本原理。以Driver Studio为开发工具,开发了脑电图机的WDM驱动程序：最后对脑电图机的WDM驱动程序进行了关键技术的分析。     

Routing and wavelength assignment in hierarchical WDM networks

A new routing and wavelength assignment method applied in hierarchical wavelength division multiplexing (WDM) networks is proposed. The algorithm is called offline band priority algorithm (offline BPA). The offline BPA targets to maximize the number of waveband paths under the condition of minimum number of wavelengths, and solve the routing and wavelength assignment (RWA) problem with waveband grooming to reduce cost. Based on the circle construction algorithm, waveband priority function is introduced to calculate the RWA problem. Simulation results demonstrate that the proposed algorithm achieves significant cost reduction in WDM network construction. __________ Translated from Journal of Shanghai Jiaotong University, 2007, 41 (5): 747–750 [译自: 上海交通大学学报]     

LVDS长距离传输电缆模型参数计算

针对双绞线在信号高速长距离传输过程中,百米以上信号衰减损耗就会加剧的情况,本文设计了百米电缆参数模型,以RLCG参数模型为研究对象,并且在其基础上估计电缆的衰减特性,结果通过对两种常用型号电缆在相同的实验条件下测试的数据,与模型仿真结果进行对比,发现在10～200MHz的频率范围内,两者的误差不超过0.5dB,这表明在一定的频率范围内,参数模型上估计的电缆损耗特性与实际测试结果基本一致。该模型为研究双绞线快速、远距离可靠地传输低电压差分信号（low voltage differential signaling,LVDS）提供理论依据。     

500-kV long-distance cable completed in Japan

The first 500-kV long-distance cable line is described. This oil filled self-contained cable has been installed along the Seto-Ohashi bridge connecting Shikoku, the fourth largest of the four major islands that constitute Japan with Honshu, the main island. The power flow will generally be from Shikoku where there is a surplus of power to Honshu, the main island. The technical features of the cable and its installation are described. Polypropylene laminated paper (PPLP), a low-loss insulation paper with high dielectric performance, was adopted, allowing the cable to carry the required transmission capacity of 1200 MW per circuit without forced cooling. The number of splices is also reduced by approximately 40%, resulting in further economy     

长距离供水工程的关阀水锤与线路充填

长距离供水工程是解决水资源时空分布不均的有效方式,工程运行中发生的水锤将严重威胁输水系统的安全.本文对长距离供水工程中关阀水锤特性进行研究,分析了长距离供水工程中的线路充填现象,推导了考虑摩阻的输水系统直接水锤公式,并对间接水锤公式进行了修正,同时探讨了其适用范围.结果表明:对于长距离供水工程,由于关阀过程中管道出现了线路充填,发生的直接水锤大小与关阀时间密切相关,关阀时间越短,直接水锤压力越大;当关阀时间大于一个相长时,长距离供水系统所产生的间接水锤压力数值上也可能超过直接水锤,修正后的间接水锤公式不仅可用于供水系统水锤分析,同时为折线关阀规律的设计提供了理论依据,计算结论为长距离供水工程的管道设计及运行调度提供了参考.     

Influences of polarization-mode dispersion on soliton transmissionsystems

In soliton transmission systems with polarization-mode dispersion (PMD), random birefringence causes solitons to generate dispersive waves, which degrade soliton transmission systems in two aspects. First, the dispersive waves cause solitons to continuously lose energy, thus induce pulse broadening. Second, the dispersive waves interact with other soliton pulses and cause distortion of a sequence of soliton pulses. Both of these effects induce performance degradation of soliton transmission systems. We study these effects of PMD on both conventional and dispersion-managed (DM) soliton transmission systems. We show that, for conventional soliton systems, although single pulse has robustness to PMD, the interplay between the dispersive waves and solitons would seriously distort a sequence of pulses and make soliton systems worse than linear systems if all other transmission impairments are neglected. We also show that DM solitons are more robust to PMD than both conventional solitons and linear systems due to the enhanced nonlinearity and less sensitivity of DM solitons to perturbations. We further point out that soliton collision-induced polarization scattering causes additional timing jitter and system performance penalty in WDM soliton systems     

WDM-PON技术的研究

无源光网络是一种新兴的覆盖最后1km的宽带接入光纤技术。文章简要介绍了时分复用无源光网络(TDM—PON)技术，然后提出从TDM—PON到WDM—PON(波分复用无源光网络)过渡所可能经历的阶段并对这几个阶段进行论述。接下来着重介绍了WDM—PON的基本工作原理及作为一种宽带接入技术的优势，并对其关键技术，如多波长激光器、波长路由器等，作了一些分析和探讨。     

AWG technologies for dense WDM applications

This paper reviews the recent technologies supporting arrayed waveguide gratings (AWGs) based on planar lightwave circuits. From the practical point of view, I describe new technologies such as an athermalization and the high-contrast waveguide that includes the mode field transfer needed for low connection loss with conventional optical fiber. As AWG applications, I present new types of AWG modules such as a dynamic gain equalizer and a variable optical attenuator (VOA) MUX/DEMUX. Both of these will play an important role for next-generation wavelength-division multiplexing networks.     

长距离特高压交流输电线路单相接地故障过电压研究

分析单相接地故障过电压的影响因素,得出使单相接地过电压最大的条件,基于此在不同的线路高抗补偿度以及沿线避雷器的布置方式下,探讨了不同线路分段方式下单相接地故障过电压不超过限制水平时线路能够达到的最大长度,并对避雷器和高抗限制过电压的效果进行了对比。研究结果表明,避雷器限制长线路单相接地故障过电压的效果不及高抗;对于分3段的线路,整条线路总长度最大不超过1 300 km时,单相接地故障过电压不会超过限制水平,单段线路的最大长度可达500 km;对于分4段和5段的线路,总长度分别不超过1 400 km、1 600 km时,过电压不会超过限制水平,单段线路的最大长度均为400 km。     

High-Speed OTDM and WDM Networks Using Traveling-Wave Electroabsorption Modulators

We describe the design and performance of a number of elements based on traveling-wave electroabsorption modulators (TW-EAMs) in optical time-division-multiplexing (OTDM) and wavelength-division-multiplexing (WDM) networks. The incorporation of traveling-wave (TW) electrode design into electroabsorption modulators (EAMs) relieves the resistance-capacitance (RC ) bandwidth limitation common to lumped components, enabling higher operation speed without shortening the device. As a result, high-speed operation can be combined with essential modulator characteristics such as modulation efficiency and extinction ratio. While significant modulation bandwidth has been achieved, a lesser known aspect is that the TW electrode also provides an extra dimension for improving and enabling functionalities beyond broadband modulation. This new dimension originates from the distributed effect of the TW design and its interactions with distinctive EAM properties. This paper reviews such developments in recent years with specific applications for optical signal processing in OTDM and WDM networks. The covered functionalities include various optical gating operations for OTDM, regenerative wavelength conversions for WDM, and clock recovery     

LVDS远程高速红外图像采集卡设计

红外成像制导是当今精确制导武器的一个重要发展方向。在红外导引头位标器的测试中,红外图像是重要的测试项目。本文介绍了一种基于FPGA和DSP的LVDS远程高速红外图像采集卡的设计,实现了LVDS数据的高速采集、红外图像预处理、PXI上位机通信及模拟视频输出等功能。实验证明,本方案在保证系统实时性的同时,具有信号处理能力强、设计灵活等优点。     

Synthesis and dissociation of soliton molecules in parallel optical-soliton reactors

Mode-locked lasers have been widely used to explore interactions between optical solitons, including bound-soliton states that may be regarded as"photonic molec...     

长距离胶带输送机变频调速控制系统设计及应用

针对某煤矿长距离胶带输送机采用西门子Simovert MV系列中压变频器调速驱动的实际工程应用,分析了胶带输送机及其张力特性、负载特性与机械特性,介绍了其优化的速度和加速度驱动模型。系统设计采用可编程控制器S7-300 PLC作为主从控制器,实现了多驱动器之间的协调控制,使胶带输送机在轻载及重载工况下,均能有效控制其柔性负载的软起动/软停车动态过程,实现各驱动之间的功率平衡,降低直接起动/快速停车过程对机械和电气系统的冲击,大大增加输送系统的安全性和可靠性。     

Multichannel soliton transmission and pulse shepherding inbit-parallel-wavelength optical fiber links

We study basic principles of the bit-parallel-wavelength (BPW) pulse transmission in multichannel single-mode optical fiber links for high-performance computer networks. We develop a theory of the pulse shepherding effect that allows simultaneous propagation of pulses in parallel bit slots by binding them into a multicomponent BPW soliton. We describe families of the BPW solitons and bifurcation cascades in a system of N incoherently coupled nonlinear Schrodinger equations that model the multichannel multiwavelength transmission in a single-mode optical fiber. We demonstrate high robustness of the composite BPW solitons, due to their underlying linear stability, to a moderate pulse walkoff     

WDM及其在电力通信网的应用

介绍了波分复用系统的组成及其主要元器件的功能,重点介绍了光放大器、分波/合波器、波长转换器、光分插复用器等的功能与应用,深入探讨了WDM系统在电力专网应用设计中应考虑的几个关键技术问题。针对电力专网的特点与现状,提出了电力专网应用波分复用系统组网的具体策略,对WDM系统在电力专网的推广应用具有指导意义。