面向下一代航电系统的数据块填装性能

结合光分组交换(OPS)网络和光纤通道(FC)技术的优势, 提出一种下一代航电系统组网方案——基于光分组交换网络的光纤通道技术(FC over OPS)。建立了数学仿真模型, 研究了一种数据块填装算法与网络实时性之间的关系, 分析不同的参数如发送带宽、最低效率门限、发送定时的选取对网络实时性的影响。进一步完成硬件原型设计和仿真, 比较了软件仿真与硬件仿真的结果, 并分析该数据块填装算法的性能。     

基于核四极矩共振原理的炸药探测方法研究与实验

介绍了一种基于核四极矩共振（Nuclear Quadrupole Resonance, NQR）原理的炸药探测方法及其基本原理和其用于炸药探测的依据，提出了一种可行的基于核四极矩共振原理的炸药检测系统，描述了其结构组成、工作原理及实验方法，并给出了对黑索金（RDX）、梯恩梯（TNT）、奥克托今（HMX）、太恩（PETN）和特屈儿（TETRYL）炸药的测试实验结果. 实验表明该方法可行，能实现对以上炸药的探测.     

波分复用全光通信网中的放大自发辐射噪声积累效应研究

给出了一种全光通信网波长域计算机模拟方法，模拟了波分复用信号经过３个光分插复用节点后的信号及放大自发辐射积累的光谱图，并与实验结果进行了对比。计算了波分复用信号经过５０个光分插复用节点极限情况下的信噪比，结果表明放大自发辐射噪声积累造成的信噪比下降仍然可以保证接收机在１０Ｇｂ／ｓ时的误码率小于１０＾－９。这些结果可以被应用到未来国家或地区级全光通信网中。     

A 7-bit photonic true-time-delay system based on an 8 × 8 MOEMS optical switch

We demonstrate a 7-bit photonic true-time-delay （TTD） system which uses an 8 × 8 micro-optical-electro- mechanical system （MOEMS） optical switch for phased array antennas （PAAs） beamforming applications. The switch controls the optical signal to pass by the fiber delay lines （FDLs） of different lengths. Different time delays between adjacent channels are obtained due to the chromatic dispersion of FDLs. Therefore, the system cannot be disturbed by the environment. The measured time delay responses are nearly linear with the wavelength spacing between optical carriers as well as the lengths of FDLs, which agrees well with the theoretical analysis.     

一种模拟多孔硅结构的新方法

以界面电化学反应动力学和离子输运动力学为基础,构造了一种多孔硅形成与结构的动态计算机模拟模型,模型中采用了电势的指数形式来表示化学反应概率。文中给出了与多孔硅的横断面透射电子显微镜(TEM)图谱和高分辨透射电子显微镜(HRTEM)照片十分接近的形貌图示。 关键词：     

Compact triplexer in two-dimensional hexagonal lattice photonic crystals

We design a compact triplexer based on two-dimensional (2D) hexagonal lattice photonic crystals (PCs).A folded directional coupler (FDC) is introduced in the triplexer beside the point-defect micro-cavities and line-defect waveguides.Because of the reflection feedback of the FDC,high channel drop efficiency can be realized and a compact size with the order of micrometers can be maintained.The proposed device is analyzed using the plane wave expansion method,and its transmission characteristics are calculated using the finite-difference time-domain method.The footprint of the triplexer is about 12× 9 μm,and its extinction ratios are less than –20 dB for 1310 nm,approximately –20 dB for 1490 nm,and under –40 dB for 1550 nm,making it a potentially essential device in future fiber-to-the-home networks.     

Impact of cascaded thin-film filters on metro networks employing NRZ, LPF-DB, and CSRZ formats

Thin-film filters (TFFs) have been widely employed in optical communication systems for their many attractive features, such as very low temperature dependence thus allowing operation without temperature controllers, flat- top passband to minimize the signal distortion, and rel- atively low insertion loss as well as little polarization dependency[1]. Also, modules based on TFFs can be designed to be upgradeable. The performance of cas- caded TFFs in optical add/drop multiplexer (OADM) rin…     

EDFA黑盒模型及其虚拟实验验证

首先根据EDFA两能级放大模型推导出黑盒模型;其次,采用虚拟实验方法,分析了黑盒模型在不同条件下计算的精度;最后分别模拟放大系统采用黑盒模型和两能级模型,有八个WDM光信号输入时,放大后的光谱图.结果表明两者十分一致.     

All-optical reconfigurable multi-logic gates based on nonlinear polarization rotation effect in a single SOA

We demonstrate an all-optical reconfigurable logic gate based on dominant nonlinear polarization rotation accompanied with cross-gain modulation effect in a single semiconductor optical amplifier (SOA).Five logic functions,including NOT,OR,NOR,AND,and NAND,are realized using 10-Gb/s on-off keying signals with flexible wavelength tunability.The operation principle is explained in detail.By adjusting polarization controllers,multiple logic functions corresponding to different input polarization states are separately achieved using a single SOA with high flexibility.     

三阶多粒度光交叉连接的优化设计研究

在采用密集波分复用技术的骨干网中,通过建立动态多粒度业务模型对由大粒度（光纤和波带）和小粒度（波长）组成的三阶多粒度光交叉连接所构成的节点的网络特性（阻塞概率和带宽阻塞比）进行了研究和仿真分析，并由此对三阶多粒度节点的结构参数和网络中的系统参数进行了优化设计.从仿真结果可以看出，所提出来的优化设计方案能够显著的减少节点结构的复杂度并改善阻塞性能，从而减小了网络中设备的规模和成本.