共查询到19条相似文献,搜索用时 187 毫秒
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光交叉连接节点的功能结构 总被引:1,自引:1,他引:0
光交叉连接(OXC)是未来波分复用光传送网实现交换与选路功能的核心部件.目前,OXC节点的物理结构得到深入研究,已经提出了一些采用不同光子器件的OXC实现方案.本文从描述光交叉连接功能的角度出发,给出一种分析OXC节点功能结构的模型,并比较各种OXC方案在功能结构上的差异。 相似文献
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无论是光路交换还是光突发交换,都离不开有光开关矩阵组成的光交叉连接节点(OXC).OXC节点是组建波分复用光网络的基本单元,OXC节点引入的串扰成为限制其投入实用的主要原因.理论分析了基于扩展Benes(DB)结构和改进扩展Benes(GMDB)结构的三种典型OXC结构中的带内串扰,结果表明基于DB结构和GMDB结构的OXC节点可以完全消除低于二阶的各类串扰.数值模拟了基于两种结构的OXC节点中带内串扰的积累特性,发现基于GMDB结构的OXC节点能大大降低串扰引起的功率代价,实验测量了8×8DB结构和GMDB结构中串扰的影响,实验结果证实了GMDB结构的低串扰特点.同时与基于DB结构的OXC节点相比,基于GMDB结构的OXC节点对光开关串扰系数的要求放宽了5 dB,大大降低了对光开关隔离度的要求. 相似文献
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光交叉连接结构的分类和推演 总被引:1,自引:1,他引:0
光交叉连接(OXC)是波分复用(WDM)全光网的核心节点技术,其结构直接决定了其性能,严格无阻塞是最根本的要求.对于已经提出的多种多样的OXC结构,本文归纳出四种最基本的无阻塞结构,在此基础上具体推演分析其它OXC结构,这样便清晰地论证了OXC结构的阻塞性.对部分阻塞结构提出了消除阻塞的修正方法. 相似文献
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由于光交叉连接器(OXC)在密集波分复用(DWDM)网络中起关键作用,文中提出一种采用双向环行器的新型光交叉连接器设计方案。其基本结构由一个双向环行器与一个光纤布拉格光栅(FBG)组成,构成一个2×2光交叉连接器,再根据这一基本结构设计出可满足实际需要的N×N光交叉连接器。此方法具有结构简单、体积小、价格便宜及所需环行器数量少(比传统的少67%) 等优点。最后,把新型光交叉连接器的插入损耗与传统结构连接器的插入损耗进行了比较。仿真结果表明,新结构比传统结构具有更小的插入损耗。 相似文献
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WDM网中同频串扰的研究 总被引:5,自引:2,他引:3
串扰是波分复用(WDM)光网络中限制光交叉连接(OXC)节点容量的一个重要因素.本文分析了相干和非相干串扰对通过OXC节点的光信号的影响,给出了固定和最佳判决门限两种情况下的光功率恶化,并进行了仿真计算.结果表明相干串扰对系统的影响很大.与固定判决相比,采用最佳判决可以降低串扰影响.串扰引起的光功率恶化主要取决于复用波数M,而与输入光纤数N关系不大.为了减小串扰对网络的限制,可以在OXC节点内使用滤波器. 相似文献
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光波导开关的最新进展 总被引:5,自引:0,他引:5
随着光纤通信技术的不断发展,作为光分插复用(OADM)和光交叉互联(OXC)核心器件的光开关作用日益突出。文章从开关单元结构、材料及调制机理三个角度对波导开关进行了划分,阐述了波导开关的基本原理以及当前的研究进展,对面临的一些技术挑战进行了分析,并提出了自己的观点。 相似文献
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The architecture of and the corresponding control algorithm for a devised optical cross-connect, limited- range wavelength converision wavelength interchangeable cross-connect (L-WIXC), are presented. The performances of L-WIXC including blocking probability, switching time, and throughput are simulated. Cost comparison with wavelength selective cross-connect (WSXC) and WIXC is calculated. Key optical parameters, such as crosstalk, eye diagram, bit error rate, and linear Q factor, are measured and discussed. 相似文献
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An optical cross connection network which adopts coarse wavelength division multiplexing (CWDM) and data packet is introduced. It can be used to realize communication between multi-CPU and multi-MEM in parallel computing system. It provides an effective way to upgrade the capability of parallel computer by combining optical wavelength division multiplexing (WDM) and data packet switching technology. CWDM used in network construction, optical cross connection (OXC) based on optical switch arrays, and data packet format used in network construction were analyzed. We have also done the optimizing analysis of the number of optical switches needed in different scales of network in this paper. The architecture of the optical interconnection for 8 wavelength channels and 128 bits parallel transmission has been researched. Finally, a parallel transmission system with 4 nodes, 8 channels per node, has been designed. 相似文献
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Atsushi Okamoto Hisashi Matsuoka Motoki Saito Yoshihisa Takayama Mototsugu Takamura 《Optical Review》1999,6(3):189-195
We propose a new optical network device photorefractive connection module (PRCM) which operates as optical switch, amplifier and signal distributor controlled by parallel optical signals. Simple optical control bus systems can be realized by cascade connection of PRCMs. PRCM branches off a desired channel from the spatial multiplexed optical bus line by appropriate setting of the control beam pattern. PRCM uses cross polarized four wave mixing (CPFWM) with extraordinary polarized writing beams and an ordinary polarized reading beam to achieve a high connection gain to the next PRCM stage. We analyze the phase matching angle of CPFWM in which the optical paths of two pump beams are slightly different. The phase conjugate reflectivity indicating a branching ratio of optical signal is derived and calculated in consideration of the phase mismatching Δk. The optimum pump ratio and the grating vector orientation for the largest phase conjugate reflectivity and signal amplification factor are discussed for optical design of PRCM. Since the measured signal beam power after passing through the BaTiO3 crystal is three or four times higher than its incident power, PRCM has a sufficient connection gain for optical bus and interconnection systems. 相似文献
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一种适用于光突发交换网络的背景流量估计模型 总被引:1,自引:0,他引:1
平面背景流量的强度是光突发交换网络中的一个重要参数。该参数直接影响网络的性能并约束网络边缘节点的组装算法。指出了在配置波长转换器的情况下,核心节点控制平面的服务速率是与背景流量密切相关的随机变量而不是确定性变量。构建了M/D/1和一种特殊的M/G/1排队模型分别描述不同配置的核心节点的行为,并以剩余偏置时间为观测变量,构建了核心节点的背景流量估计模型。仿真和数值分析表明,该模型能够实时反映出核心节点控制平面的背景流量强度。 相似文献
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提出了双通构型的基于“和频”和“差频”级联二阶非线性效应的可变波长路由方案,通过调节两个抽运源的频率,可以从一个WDM(wavelength division multiplexing)链路中取出任意一个信道,然后将其转换为任意一个波长并插入到另一个WDM链路中去.实现了可调谐波长转换和光波长路由的结合.通过小信号分析,给出了相位匹配情况下,输入信号光在波导中功率变化的表达式和输出转换光功率变化的表达式,并给出了提高系统效率的对两个抽运光功率的优化方案.数值计算表明,只要信道间隔大于02nm(25GHz
关键词:
光波长路由
光波长转换
光交换
PPLN 相似文献
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随机取向烟尘团簇粒子的光学截面的数值计算 总被引:2,自引:2,他引:0
采用蒙特卡罗方法根据团簇—团簇凝聚(CCA)模型对由球形原始微粒凝聚而成的烟尘团簇粒子进行了模拟,利用离散偶极子近似(DDA)方法数值计算了不同原始微粒粒径和数目组成的随机取向的烟尘团簇粒子的总消光截面、吸收截面及散射截面等光学特性参数,研究了原始微粒粒径及数目对随机取向烟尘团簇粒子光学特性的影响。结果表明:当入射波长一定时,随机取向烟尘団簇粒子的光学特性主要取决于原始微粒的粒径和数目;烟尘团簇粒子对不同波段激光的吸收和散射存在差别,这种差别随原始微粒粒径及数目变化而变化。这一工作为研究电磁波在烟尘中的传输特性提供重要参考数据。 相似文献
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Here we have demonstrated a novel architecture of colorless wavelength division multiplexed-passive optical network (WDM-PON) and analyze its performance which is capable of transmitting 10 Gbps data symmetrically in both downstream and upstream. In this architecture downstream data is subcarrier modulated (SCM) using radio frequency (RF) as subcarrier and laser frequency as carrier with the help of a Mach–Zehnder modulator (MZM). For upstream data modulation an electro-absorption modulator, an optical coupler and reflective semiconductor optical amplifier (RSOA) are used. Upstream data is transmitted through wavelength conversion between pump wavelength and continuous wave light sent from central office (CO) using cross gain modulation (XGM) in RSOA. Pump wavelengths have separate wavelength band than the carrier's wavelength sent from optical network unit (ONU) and can be chosen any one in its band. Since carrier reuse scheme is implemented so all the ONUs are operates in colorless mode. Effect of ER of delay interferometer (DI) on output OCSR of DI for different input OCSR is performed for SCM data. Simulation is performed with all 16 downlink and 16 uplink channels having data rate of 10 Gbps having acceptable performance. 相似文献