5G网络通信线路规划与城市规划结合策略探讨

随着现代社会的发展迅速,传统运营商在实际发展过程中也日渐暴露出传输线路上的短板以及不足,如建设管道时未统一且各自为政,导致道路被多次开挖,造成资源浪费.另外,多次开挖道路导致建设时期的市容市貌也被影响.针对这一问题,提出5G网络在传输规划时,将其与城市规划进行有效结合,使得5G网络得以真正融入到城乡总体规划中,与土地利用、道路规划等进行衔接,这样使得传输线路在建设时期得以协调落实,并对空间资源需求进行细化.     

ROADM全光交换网络关键技术发展与应用展望

介绍了可重构光分插复用器(reconfigurable optical add/drop multiplexer,ROADM)网络的发展历程、ROADM技术方案以及国内ROADM网络的部署情况。全面阐述了ROADM关键技术的发展方向,包括光交叉连接(optical cross-connect,OXC)设备、高维度波长选择开关(wavelength selected switch,WSS)、波长无关/方向无关/竞争无关ROADM(colorless/directionless/contentionless ROADM,CDC-ROADM)、400 Gbit/s FlexGrid ROADM、下一代波长交换光网络(next-generation wavelength switched optical network,WSON2.0)智能控制平面技术。分析了现有ROADM网络应用场景与技术发展趋势,展望了ROADM全光交换网络未来发展前景。     

A fiber-array probe technique for measuring the viscosity of a substance under shock compression

A fiber-array probe is designed to measure the damping behavior of a small perturbed shock wave in an opaque substance, by which the effective viscosity of substance under the condition of high temperature and high pressure can be constrained according to the flyer-impact technique. It shows that the measurement precision of the shock arrival time by using this technique is within 2 ns. To easily compare with the results given by electrical pin technique, the newly developed method is used to investigate the effective viscosity of aluminum （Al）. The shear viscosity coefficient of A1 is determined to be 1700 Pa.s at 71 GPa with a strain rate of 3.6× 10^6 s-1, which is in good agreement with the results of other methods. The advantage of the new technique over the electrical pin one is that it is applicable for studying the non-conductive substances.