光孤子误码测量的实验系统

在国内最先进行了孤子通信的误码测量,成功的将２．５Ｇｂ／ｓ的孤子传输了５２ｋｍ,经过连续２小时测量无误码。     

并行多通道成像和频谱分析

本文研究了实现并行多通道成像和频谱分析的方法,提出了用光阵发生器实现并行多通道处理的方法;设计和加工了产生１６、３２点阵的光阵列发生器;给出了并行多通道的点阵分布、光强分布、成像和频谱结构。     

啁啾光脉冲在自作用形成的时间波导中传播

将光脉冲在克尔介质中自作用产生的折射率变化作二阶近似,求解所得到的传播方程,得到啁啾高斯脉冲幅度,脉冲宽度和周啾参数随传播距离变化的严格解析解,讨论了基模高斯脉冲孤波传播的条件.     

SDH光纤通信技术及其在某航天工程中的组网应用

在探讨了ＳＤＨ基本网元类型、基本拓扑类型、自愈环结构、ＤＸＣ选路的自愈环、同步的影响和考虑原则等与组网技术有关的十一个方面的基本问题的基础上,介绍了ＳＤＨ光纤通信组网技术在某航天本地通信网工程中的实际应用,给出了应用ＳＤＨ技术组网的一些研究结果     

只用两个量子态的星型量子密钥网络方案

要建立一个安全的保密通信通道,关键就是密钥管理。传统的密钥管理并不能完全解决安全问题,量子密码技术却可以从根本上解决这个问题。本文从实用的角度提出一个基于无源光学网络环境中建立量子密钥的实用方案,这个方法可以由一个网络控制者在一个星型网络上和多个网络用户分别建立、更新密钥。为节约量子探测设备,和通常用四个量子态的保密通信方案相比,这个方案只用了两个量子态。本文还分析了在网络的各个位置上存在窃听时网络的安全性能。     

皮秒光参量振荡放大器用于指纹印迹识别的研究

对不同载体上不同沾染物的指纹印迹特征用410～710nm可调谐激光进行荧光再现,再用滤色片将激光滤除,从而摄取清晰的指纹印迹荧光照片。     

高可见光透射率的溴取代萘酞菁锌化合物的光限幅特性研究

应用倍频Nd:YAG脉冲激光,在波长为532nm,脉冲宽度分别为8ns和23ps的条件下,研究了四溴-2,3-萘酞菁锌()(tetrabromo-2,3-naphthalocyanineZinc())化合物的光限幅特性。实验结果表明,在可见光透射率达到93%的条件下,该化合物具有良好的光限幅特性     

光正交码的有限射影几何设计方法

光正交码是适用于光纤CDMA系统的扩频序列。但在定义中并未给出构造、生成方法,本文研究的有限几何法是一种有效的光正交码设计方法,它可以设计出最优码。本文对此法原理、设计方法进行了研究,提出了一种计算机辅助设计方法,并给出了实际设计过程及结果。     

New developments in the heteroepitaxial growth of Be-chalcogenides based semiconducting alloys

We have studied the heteroepitaxial growth of Zn(Mg)BeSe alloys on both GaAs and Si substrates. X-ray measurements show that ZnMgBeSe quaternary alloys can be grown with a high structural quality on GaAs(001). Linewidths as low as to 20 arcsec have been obtained from double x-ray diffraction and the etch pit density is in the range of 10⁻³ cm⁻². The growth of ZnBeSe ternary alloys on vicinal Si(001) substrates has been investigated. Optical properties of Zn_0.55Be_0.45Se which is lattice-matched to silicon have been studied by photoluminescence and reflectivity and a fundamental bandgap E₀ of 3.85 eV has been measured. Therefore, this material is a potential candidate for ultraviolet B detection. However, it is important to note that these measurements are not conclusive about the direct nature of alloys bandgaps.     

Moldless Printing of Silicone Lenses with Embedded Nanostructured Optical Filters

In this work, both light‐shaping and image magnification features are integrated into a single lens element using a moldless procedure that takes advantage of the physical and optical properties of mesoporous silicon (PSi) photonic crystal nanostructures. Casting of a liquid poly(dimethylsiloxane) pre‐polymer solution onto a PSi film generates a droplet with a contact angle that is readily controlled by the silicon nanostructure, and adhesion of the cured polymer to the PSi photonic crystal allows preparation of lightweight (10 mg) freestanding lenses (4.7 mm focal length) with an embedded optical component (e.g., optical rugate filter, resonant cavity, and distributed Bragg reflector). The fabrication process shows excellent reliability (yield 95%) and low cost and the lens is expected to have implications in a wide range of applications. As a proof‐of‐concept, using a single monolithic lens/filter element it is demonstrated: fluorescence imaging of isolated human cancer cells with rejection of the blue excitation light, through a lens that is self‐adhered to a commercial smartphone; shaping of the emission spectrum of a white light emitting diode to tune the color from red through blue; and selection of a narrow wavelength band (bandwidth 5 nm) from a fluorescent molecular probe.