Preparation and Characterization of Zeolite Beta with Low SiO_2/Al_2O_3 Ratio

Zeolite beta with a low SiO2/Al2O3 ratio was synthesized by a novel two-step process.The synthesized sample was characterized with XRD,SEM,FTIR,and N2 adsorption-desorption and solid-state MAS NMR.The results showed that aluminium species were inserted into the framework of zeolite beta.The BET surface area,volume,and particle size of the zeolite beta sample decreased with decreasing SiO2/Al2O3 ratio.Our process was proved an efficient route to synthesize zeolite beta with a low SiO2/Al2O3 ratio.     

布喇格光纤光栅反射特性及制作的理论研究

在对光纤光栅折射率分布进行合理假设的基础上,运用耦合模理论计算了光纤光栅的反射特性,对其反射特性与相关参数的关系进行了分析,并且还推导出了用相位掩模法制造光纤光栅的理论根据,得到了一些有益于光纤光栅制造的结论和有用公式。     

长途传输波分复用系统的设计

随着波分复用（WDM）技术的广泛应用，在工程调测和系统的运行过程中出现了由于系统的适应能力较差和灵活性不够而引起系统优化时间过长的问题，给运营商带来了许多不便，同时，WDM已经由一般的长途应用向超长距离传输和城域网方面发展，适应性和灵活性成为WDM系统网络应用的主要要求，本文将介绍WDM系统的关键技术，重点论述WDM网络设计的一些原则，最后提出WDM系统设计的注意事项。     

A novel dynamic RWA algorithm with intelligent granularity regulation in multi-granular all-optical networks

With the great advances of DWDM technology, optical cross-connects have to deal with much more wavelengths. Accordingly, the size of optical cross-connects become larger and larger; also the management cost is much higher. To simplify the architecture of cross-connects for low-complexity maintenance, waveband switching (WBS) in conjunction with several optical cross-connect architectures have been proposed and attracted much attention recently. The main concept of WBS is to group multiple wavelengths into a single waveband and what it concerns includes cross-connect cost and port count reduction. In this paper, we investigate the dynamic RWA problem (MG_DRWA) in WBS networks comprising of all-optical switches based on a cost-effective multi-granular optical cross-connect (MG-OXC) architecture. With this reconfigurable architecture, an optical cross-connect can switch at either fiber level, waveband level, or wavelength level according to its configuration. In order to effectively accommodate dynamic traffic demand, we propose a new MG_DRWA algorithm. Numerical results reveal that the proposed algorithm can achieve significantly better blocking performance as compared to a previously proposed algorithm named MILB under various traffic loads.     

氩离子激光掺铒光纤的双稳态

分析了掺铒光纤双稳态（ＥＤＦＯＢ）的工作原理、工作条件和特性，并利用氩离子激光（５１４．５ｎｍ）实现了ＥＤＦＯＢ的低功率（＜１０ｍＷ）运转。实验与理论结果基本相符。     

一种可用于可调谐环行Ti：Al_2O_3激光器的宽带单向器

本文介绍一种宽带单向器的原理及设计。选用ＴＧＧ作磁旋光介质，旋光石英晶片作补偿片，所设计的色散补偿型宽带单向器预计可在７００～１０００ｎｍ波长范围内实现环行激光腔中的单向行波运行；将其应用在可调谐环行Ｔｉ：Ａｌ２Ｏ３激光器中，获得了良好的实验结果。     

共轭高分子三阶非线性光学材料

概述了ｎ－共轭高分子材料的三阶非线性光学性质，着重讨论了化学结构对其光学非线性的影响，说明了ｎ－共轭聚合物的三阶非线性极化率主要取决于共轭主链的结构，侧链取代基的变化对其非线性影响不大，文中展望了共轭高分子材料在集成光学中的应用前景。     

A region-based selective optical flow back-projection for genuine motion vector estimation

Motion vector plays one significant feature in moving object segmentation. However, the motion vector in this application is required to represent the actual motion displacement, rather than regions of visually significant similarity. In this paper, region-based selective optical flow back-projection (RSOFB) which back-projects optical flows in a region to restore the region's motion vector from gradient-based optical flows, is proposed to obtain genuine motion displacement. The back-projection is performed based on minimizing the projection mean square errors of the motion vector on gradient directions. As optical flows of various magnitudes and directions provide various degrees of reliability in the genuine motion restoration, the optical flows to be used in the RSOFB are optimally selected based on their sensitivity to noises and their tendency in causing motion estimation errors. In this paper a deterministic solution is also derived for performing the minimization and obtaining the genuine motion magnitude and motion direction.     

Measurement of metal nanolayers optical parameters using surface plasmon resonance method

The results of experimental definition of optical parameters of silver nanolayers by the method of surface plasmon resonance (SPR) are described. The goniometric installation for measurement of angular dependences of reflection of light by layered nanosructures at the attenuated internal reflection (angular spectrum of reflection) is designed. Calculation of optical parameters of nanolayers is executed taking into account the form of a curve of tin angular spectrum of reflection. The text was submitted by the authors in English.     

相移掩模的制作

本文阐述相移掩模技术研究中，常用的几种主要相移掩模制作方法，重点介绍了无络ＰＳＭ、Ｌｅｖｅｎｓｏｎ交替型ＰＳＭ、边级ＰＳＭ、亚分辨辅助ＰＳＭ以及激光直写制作ＰＳＭ的方法。