Aspects of multistation quantum information broadcasting

We study quantum information transmission over multiparty quantum channel. In particular, we show an equivalence of different capacity notions and provide a multiletter characterization of a capacity region for a general quantum channel with k senders and m receivers. We point out natural generalizations to the case of two-way classical communication capacity.     

Cross-phase modulation induced phase fluctuations in optical RZ pulse propagating in dispersion compensated WDM transmission systems

The basic mechanism of cross-phase modulation induced phase fluctuations in optical RZ pulse propagating in a periodically dispersion compensated transmission line has been investigated. Ordinary differential equations have been derived using variational analysis to estimate the phase fluctuation and the analytical result is verified by numerical simulations based on split-step Fourier method. We therefore explore the impact of different dispersion compensation maps on phase fluctuation for 10 Gb/s and 40 Gb/s WDM transmission systems. The effects of initial pulse spacing between channels, channel spacing and residual dispersion on phase shift have been studied. We find that cross-phase modulation induced phase fluctuation can be mitigated by proper adjustment of channel spacing and/or residual dispersion.     

Analysis and design of electromagnetic band gap structures with stratified and inhomogeneous media

In this study, a generalized and easy to use method based on Hill's equation and chain matrix concept is used to analyze the electromagnetic wave propagation in stratified dielectric and inhomogeneous media with arbitrary profiles.Numerical simulations are performed to compute the reflection and transmission of several Electromagnetic Bandgap (EBG) structures for various permittivity profiles and given polarization as well as incidence angles of driving fields.Multilayer structures are analyzed and optimized to enhance their selectivity performances. Obtained results agree excellently well with other published data.     

Spliced-fiber mode filter for 1060-nm single-mode transmission

We present a novel mode filter operating for the 1060-nm band, which selectively removes the power of the high-order mode (HOM) from a conventional single-mode fiber (C-SMF) that supports two modes at the short-wavelength band. Our mode filter is fabricated very easily by fusion-splicing a short section of short-wavelength single-mode fiber in the middle of the C-SMF link. By using our spliced-fiber mode filter (SF-MF), a high HOM suppression performance of > 18 dB has been achieved with a low insertion loss of < 0.3 dB over the full band of optical communications from 1050 nm to 1650 nm. We have also developed a new mode power measurement scheme that takes advantage of the bending sensitivity of the HOM guidance. This measurement scheme enabled us to evaluate accurately the performance factors of the fabricated mode filter.     

使用防护布线减小差分传输线间的高频串扰噪声

随着高速电路的不断发展,差分传输线得到了越来越广泛的应用。它具有低辐射和较好的抗共模噪声能力。但是传统的差分线结构不能有效的降低邻近差分对之间的串扰噪声,这将影响到高速系统的信号完整性。文章针对使用防护布线的方法,讨论了三种不同结构的防护布线,在全波电磁仿真软件HFSS中建立了三维物理模型,利用混模S参数分析了它们对于减小串扰噪声的作用,从场的角度对比了它们的电磁屏蔽效果,并对如何使用防护布线提出了一些建议。     

基于气球载雷达平台区域雷达情报传输系统设计

提出了在气球载雷达平台上搭载中继设备,利用第三代移动通信技术,实现雷达情报传输的方案,详述了基于气球载雷达平台区域雷达情报传输系统的组成、空中接口及协议、无线传输帧结构、信道。     

飞控数据的远距离传输及抗干扰设计

从硬件设计、电路实现方面介绍了一种用于对飞控数据进行远距离传输的实现过程,并且就传榆过程中的干扰因素进行了分析,提出了一些相应的解决措施,经过对传统的远距离传输方法进行了分析以后系统采用了一种新型的并行传输的方法来实现飞控数据和地面测试台之间数据的传输,所设计的新型通信方式可以提高传输的速度,增强了抗干扰能力,可在复杂工业环境下正常运行。     

大气湍流对舰载激光通信中光能量分布的影响

针对激光在洋面上大气湍流中传输时,光能量分布发生变化,影响激光通信质量。本文基于大气光通信信道模型,对激光在大气湍流中的传输进行模拟,分析大气折射率结构常数、传输激光的波长,传输距离对光能量分布的影响,并用MATLAB对其影响进行了数值模拟。结果表明：在仅考虑大气湍流对激光传输影响的条件下,传输激光的波长对光能量分布具有重要影响。     

高功率密度光纤激光元器件传输特性测试系统

为了提高高功率密度下光纤激光元器件传输特性测量精度,采用基于光纤标准测试方法的双光路测量结构,设计了自动光功率比测量系统。对双光路系统的特点进行了理论分析和实验验证。利用固体微晶片激光器作为光源输出,建立了折射率匹配法传输特性测试仪实验装置,对掺镱双包层光纤的传输损耗特性进行了测量。实验中测得35m长掺镱双包层光纤对1064nm光的插入损耗为2.645dB,测得100组数据对应的标准偏差为0.026dB。并在不同的条件下进行了多次重复实验,重复测量误差不超过0.07dB。这一结果对于提高光纤激光元器件测试精度是有帮助的。     

多腔薄膜梳状滤波器的透射峰随入射角的变化规律

利用特征矩阵法研究了多腔薄膜梳状滤波器在C波段的透射峰在入射角微小变化中的变化规律,结果表明：在入射角缓慢增大的过程中,各透射峰的位置逐渐向短波方向移动,各透射峰的形状周期性地变化;随着入射角的增大,透射峰个数减少,透射峰变宽,透射峰的位置和形状变化加快,以至于极小的入射角变化就会使透射峰的位置和形状产生很大的变化。