实现交叉光互连的全息元件的研究

光学互连与电互连相比,具有并行处理、传输速度快、信息容量大、空间频带宽、串音小和能量损耗低等优点,因此在光计算和信息处理领域中成为越来越吸引人的课题[1~4].在光信息处理中,光互连在实行多种函数及变换过程中具有重要的地位[5].在数字光计算中,光互连可实行多种算法和构造,其中自由空间规则光互连如全混洗(perfect shuffle)光互连、交叉(crossover)光互连及蝶(butterfly)光互连已得到广泛研究和应用[6~8].     

光互连Omega网络与全交叉网络拓扑等价的多样性

本文对互连网络拓朴等价的分析方法作了简单评述,并采用互连网络拓朴等价的图分析法分析了自由空间光学互连Omega网络与全交叉网络的拓朴等价及其多样性,拓展了Omega网络在通信交换、数字光计算以及并行多处理机系统的潜在应用。     

光电混合MESH互连网络的研究

提出一种自由空间空分复用的光学MESH互连网络系统．该光学MESH互连网络系统是由N×4位相型计算全息傅里叶光栅分束器、高速多量子阱空间先调制器SEED器件和高速间接耦合光电探测器列阵组成,具有互连数大、数据通道同步性好、光学硬件少、系统简单等特性．     

未来计算系统中的光互连

论述了光互连网络对巨型计算机和智能计算机发展的重要作用，指出了光互连网络是解决目前电子计算机中通信“瓶颈”的关键，讨论了采用光互连的物理依据，强调了光互连网络的高效，快速和大容量特性。最后分析了我们正在研究的光学交叉开关互连网络的几个关键参数和初步实验结果。     

用多级衍射全息光栅实现2-D自由空间光学互连网络

用Mach-Zehnder干涉仪分两步记录制作了具有多级衍射的全息光栅.利用其多级衍射效应,实现了一点到多点的光学互连.再将两个1-D光栅正交密接实现2-D自由空间光学互连网络.结果表明该方法是可行的,且结构简单、操作容易.     

反-逆混洗光电混合循环排序网

提出了一种新型光电混合循环排序网络。排序网的互连级采用自由空间光学反－逆混洗（Ｃｏｍｅｇａ）互连,比较交换节点列阵采用硅互补金属－氧化物－半导体－自由光效应器件（ＣＭＯＳ－ＳＥＥＤ）光电混合集成电路来实现。由于反－逆混洗多级网络各互连级完全相同,该排序网络通过采用循环结构大大地简化系统所需的硬件。通过采用并行比较交换节点进一步提高了排序网络中比较操作的速度。     

一种新型的光电混合多项式求值并行处理系统

本文提出了一种新型的并行求解多项式值的光电混合数字计算系统。系统中,我们采用了一种新的自由空间互连网络:逆全混洗互连,并用一特殊的组合棱镜和向列型液晶空间光调制器配合,在光学上实现了逆全混洗互连。     

64×64全交叉互连函数的光学实现

光互连全交叉网络在巨型计算机和光子交换网络系统等领域具有十分重要的潜在应用。本文在自行设计研制成功棱镜光栅和６５×６５大列阵Ｄａｍｍａｎｎ光栅的基础上，运用自由空间光学互连技术实现了６４×６４全交叉网络的互连函数。采用互连矩阵对输出图样进行了计算，结果与实验吻合。     

基于光互连全交叉网络的快速傅里叶变换并行计算

本文提出了利用全交叉互连函数实现快速傅里叶变换(FFT)的并行算法。采用现有的电子处理单元通过自由空间光互连全交叉网络构成光电混合型单指令流多数据流(SIMD)计算机系统将是实现这一并行算法的有效体系结构。     

光学全混洗网络互连函数的矩阵描述及其应用

采用自由空间光学互连技术实现的全混洗网络是数字光计算系统的基本互连网络,本文针对全混洗互连函数现有描述方法的不足,引入了描述全混洗互连函数的互连矩阵,并给出了全混洗网络互连矩阵的具体形式,为模拟或验证全混洗网络实验结果提供了理论依据。     

Compact Optical WDM ATM Switch with an Aggregate 4-Tbit/s Throughput

We propose a novel scheme for interconnection of multiple high-speed (2.5 10 Gbit s) asynchronous transfer mode (ATM) streams through an optical wavelength division multiplexing (WDM) network with a total network capacity of up to 4 Tbit/s. The proposed architecture is based on placing the optical WDM portion of the network in a physically small area, i.e., one central office or in a single rack. This helps to avoid technological obstacles such as power budget, dispersion, and synchronization limitations as well as optical output buffering. The interconnection is an ATM packet switched network and provides optical contention resolution. We show that the implementation of such a network is possible using currently available optoelectronic technology. An optional extension of the network is proposed by a combination of WDM and space division multiplexing (SDM) technology. Simulation results are presented, indicating network throughput of up to 100 %.     

Emerging Trends in Fiber Optic Networks

We propose a novel scheme for interconnection of multiple high-speed (2.5 10 Gbit s) asynchronous transfer mode (ATM) streams through an optical wavelength division multiplexing (WDM) network with a total network capacity of up to 4 Tbit/s. The proposed architecture is based on placing the optical WDM portion of the network in a physically small area, i.e., one central office or in a single rack. This helps to avoid technological obstacles such as power budget, dispersion, and synchronization limitations as well as optical output buffering. The interconnection is an ATM packet switched network and provides optical contention resolution. We show that the implementation of such a network is possible using currently available optoelectronic technology. An optional extension of the network is proposed by a combination of WDM and space division multiplexing (SDM) technology. Simulation results are presented, indicating network throughput of up to 100 %.     

基于PAM4制的高速垂直腔面发射激光器研究进展

短距离光互联技术在云计算、5G通信、物联网技术等方面有重要的商业应用价值。基于高速垂直腔面发射激光器(Vertical-cavity surface-emitting laser,VCSEL)与多模光纤组成链路、采用直接调制检测、并使用如四电平脉冲幅度调制(Four-level pulse amplitude modulation,PAM4)等的高阶调制模式是现阶段短距离光互联链路方案的首选。本文首先介绍了短距离光互联应用的研究现状;第二部分介绍了VCSEL的发展、结构以及动态参数;第三部分介绍了PAM4调制方法及伴随使用的各种电子技术(均衡,前向纠错,脉冲整形);第四部分介绍了提高单链路速率的波分复用(Wavelength division multiplexing,WDM)技术;最后对以高速VCSEL、多模光纤、直接调制检测、PAM4调制以及波分复用技术的短距离光互联方案应用前景做了总结和展望。     

猫眼逆向调制自由空间激光通信技术的研究进展

猫眼逆向调制自由空间激光通信技术相比传统激光通信技术更具优势。本文介绍了逆向调制自由空间激光通信技术的原理和猫眼逆向调制终端的原理结构。综述了国内外猫眼逆向调制自由空间激光通信技术在调制器特性、猫眼光学系统和技术应用3个方面的研究现状。分析了猫眼逆向调制自由空间激光通信的关键技术。最后,展望了该项技术的应用前景。     

Beam steering and deflecting device using step-based micro-blazed grating

The rapidly evolving demands of optical communications and optical switching systems have created a new market for high capacity all-optical beam steering and deflecting techniques. One technology potentially capable of realizing such systems uses the multistep micro-blazed grating optical beam deflectors based on binary and multiple-phase modulation methods. The micro-optical element has been fabricated by introducing very large scale integration (VLSI), stepping photolithography and reactive ion etching (RIE), which can realize beam steering, deflecting, splitting, and switching in free space, and its diffraction properties are determined by the blazed-grating parameters, such as the number of steps, grating depth, grating period, as well as blazed profile. The theoretical analysis and primarily experimental result show that this phase-type element has the advantages of high diffractive efficiency, low cross talk, small feature size, and high reliability due to nonmechanical beam steering without any moving parts. Hence it is ideally suited to applications in optical communication and optical interconnection network.     

A two-way optical interconnection network using a single mode fiber array

We present a dynamic free space interconnection network for single mode fibers. The architecture consists of a two-way imaging geometry involving only one single mode fiber array. Input and output fibers belong to the same fiber array. Programmable and fixed diffractive optical elements are used for beam steering and wavefront correction. We show that the network ensures favorable conditions for launching and allows for a high interconnection volume with minimal insertion losses at 2.5 Gb/s. The architecture is also adapted to the use of binary electrically addressed spatial light modulators.     

光互连中二元计算全息算法的研究

二元计算全息(BCGH)是光学信息处理中一个重要元件,其在动态光互连中被广泛使用.为了更好地在光互连中应用BCGH,本文设计改进了二元计算全息的选代算法,比较了几种内能函数下的迭代算法所设计的BCGH,对其象质的不同指标进行了分析.结果表明,用迭代搜索算法是光互连应用中设计BCGH的一种较理想算法.