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7th International Symposium on High-capacity Optical Networks and Enabling Technologies最新文献

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Provisioning for probabilistic failures in multi-domain DWDM networks 多域DWDM网络中概率故障的预置
M. Esmaeili, K. Kazi, S. Khan, A. Rayes, N. Ghani
This paper addresses multi-domain lightpath provisioning within the context of correlated multi-failure events. The work jointly incorporates both risk minimization and traffic engineering objectives, and develops a novel graph theoretic scheme for distributed operation in realistic optical network settings. Detailed performance evaluation results are then presented to gauge the effectiveness of the proposed multi-domain provisioning solution.
本文讨论了在相关多故障事件背景下的多域光路配置。该工作将风险最小化和流量工程目标结合起来,提出了一种新的图论方案,用于现实光网络环境下的分布式运行。然后给出了详细的性能评估结果,以衡量所提出的多域供应解决方案的有效性。
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引用次数: 1
Performance evaluation of hybrid network using RIP & IGRP for different applications 基于RIP和IGRP的混合网络在不同应用中的性能评估
Sapna, Manju Sharma, Harpreet Kaur
This paper presents the performance evaluation of hybrid network using RIP & IGRP routing protocols for different applications in low load campus network. In this network model, generic LANs models and WLANs are used. In this paper, a simulated environment is created where many applications are in use at a time and their mutual effects thereof. This network model is based on OPNET IT GURU Academic Edition. This model is tested against various types of applications (Email, FTP, & Print Server) in Hybrid Networks. Two routing protocols RIP and IGRP are used to check the performance of Hybrid Network for different applications. This OPNET simulation shows the impact of IP routing protocol for hybrid networks for different types of applications.
本文针对低负载校园网中不同应用情况,对采用RIP和IGRP路由协议的混合网络进行了性能评价。在该网络模型中,使用了通用局域网模型和无线局域网模型。在本文中,创建了一个模拟环境,其中同时使用许多应用程序及其相互影响。该网络模型基于OPNET IT GURU学术版。该模型在混合网络中针对各种类型的应用程序(电子邮件,FTP和打印服务器)进行了测试。针对不同的应用,采用RIP和IGRP两种路由协议来检查混合网络的性能。这个OPNET仿真显示了IP路由协议对不同类型应用的混合网络的影响。
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引用次数: 3
Performance enhancement of AlGaN/GaN based UV laser diode for short-λ optical communication 用于短λ光通信的AlGaN/GaN基紫外激光二极管的性能增强
M. Khazir, M. Raja, Attaullah Shah, A. Mahmood
Qualitative optimization of the InAlN as electron-block layer (EBL) has been studied. Analytical comparisons of AlGaN and modified InAlN as EBLs have been performed. Using 2D simulation, significant improvement in the emission intensity of the designed structures with In0.18Al0.82N EBLs compared to similar with non-EBL and Al0.8Ga0.82N as EBL is observed. This enhancement can be attributed to the fact that modified EBL is more efficient in electron confinement and reduces the efficiency droop caused by carrier spillover into pregion.
研究了InAlN作为电子块层(EBL)的定性优化。对AlGaN和改性InAlN作为EBLs进行了分析比较。通过二维模拟,与非EBL和Al0.8Ga0.82N EBL相比,采用In0.18Al0.82N EBL设计的结构的发射强度有显著提高。这种增强可以归因于修饰的EBL在电子约束方面更有效,并且减少了载流子溢出到区域引起的效率下降。
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引用次数: 0
Analytical studies of laser parameters for ranging and illuminating satellites from H-SLR station H-SLR站测距照明卫星激光参数分析研究
Makram Ibrahim, A. A. El-Hameed, G. Attia
In this paper, the laser system used at the Helwan Satellite Laser Ranging Station (H-SLR) will be used in satellite's illumination as well as for satellite ranging. The estimated model which describes the energy and number of photons as well as the number of photoelectrons are investigated from the received signals of laser beam. For the ranging purposes, the equipment used at the H-SLR is described and also the method used for its calibration. The Range corrections due to the effect of the atmosphere on the laser beam is also discussed and applied for some satellites observed from Helwan. The ranging and illuminating space satellites are modeled and computed from the H-SLR parameters. The numbers of photons, of photoelectrons are then computed from the ranging data.
在本文中,贺湾卫星激光测距站(H-SLR)使用的激光系统将用于卫星照明和卫星测距。从接收到的激光束信号出发,研究了描述光子能量和光子数以及光电子数的估计模型。为达到测距的目的,本文描述了H-SLR所使用的设备及其校准方法。本文还讨论了大气对激光束的影响所引起的距离修正,并将其应用于从赫尔万观测到的一些卫星。根据H-SLR参数对空间测距和照明卫星进行了建模和计算。光子的数量,光电子的数量,然后从测距数据计算出来。
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引用次数: 4
Advance simulation and optimization of high power lnGaN/GaN laser diodes 高功率lnGaN/GaN激光二极管的先进仿真与优化
Yogiraj M. Ranade, M. Khazir, M. Raja
The optimization of InGaN/GaN multiquantum wells structure based on Si-doped GaN substrate for λ∼445 nm is performed. Advance simulation for a self-consistent laser model combined with band-structure and free-carrier gain calculations is employed to study effects such as waveguiding, carrier transport and heat flux. Enhancement in output power of the optimized structure is calculated. It has been found that electron leakage into the p-doped ridge is the major limiting factor for high output power. The non-uniformity of the carrier distribution among quantum wells is believed to be responsible for undesired absorption. Noticeable improvement in the threshold currents and corresponding substantial enhancement in the optical output power have been achieved.
本文对λ ~ 445 nm的InGaN/GaN多量子阱结构进行了优化。结合带结构和自由载流子增益计算,对自洽激光模型进行了预先模拟,研究了波导、载流子输运和热通量等效应。计算了优化后结构输出功率的增强效果。研究发现,电子泄漏到掺磷脊是限制高输出功率的主要因素。量子阱间载流子分布的不均匀性被认为是造成不期望吸收的原因。在阈值电流的显著改善和光输出功率的相应实质性增强已经实现。
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引用次数: 0
Impact of metal nano-grating phase-shift on plasmonic MSM photodetectors 金属纳米光栅相移对等离子体MSM光电探测器的影响
N. Das, A. Karar, C. Tan, K. Alameh, Y. T. Lee
In this paper, finite difference time-domain (FDTD) method is used to simulate the light absorption enhancement in a plasmonic metal-semiconductor-metal photodetector (MSM-PD) structure employing a metal nano-grating with phase-shifts. The metal fingers of the MSM-PDs are etched with appropriate depths to maximize light absorption through plasmonic effects into a subwavelength aperture. Simulation results show that the nano-grating phase-shift red-shifts the wavelength at which the light absorption enhancement maximum, and that the combined effects of the nano-grating groove shape and the nano-grating phase-shift, degrade the light absorption enhancement by up to 50%.
本文采用时域有限差分(FDTD)方法模拟了采用相移金属纳米光栅的等离子体金属-半导体-金属光电探测器(MSM-PD)结构的光吸收增强。msm - pd的金属指具有适当的蚀刻深度,以最大限度地通过等离子体效应吸收光进入亚波长孔径。仿真结果表明,纳米光栅相移会使光吸收增强最大的波长发生红移,并且纳米光栅沟槽形状和纳米光栅相移的共同作用会使光吸收增强降低50%。
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引用次数: 2
A 1×2 adaptive optical splitter based on Opto-VLSI processor 一种基于Opto-VLSI处理器的1×2自适应分光器
H. Mustafa, F. Xiao, K. Alameh
A 1×2 adaptive optical splitter structure is proposed and experimentally demonstrated. The 1×2 adaptive optical splitter structure is based on Opto-VLSI in conjunction with 4-f imaging system. An Opto-VLSI processor is software driven and capable of splitting an optical beam into different directions when a multicasting phase hologram is uploaded. An input optical signal launched into an input optical fiber port is split and coupled into two output optical fiber ports with arbitrary splitting ratios over a wavelength range exceeding 50 nm.
提出了一种1×2自适应分光器结构,并进行了实验验证。1×2自适应分光器结构是基于Opto-VLSI结合4-f成像系统。Opto-VLSI处理器是软件驱动的,能够在上传多播相位全息图时将光束分裂成不同的方向。输入光信号发射到输入光纤端口后,在超过50nm的波长范围内,以任意的分割比被分割并耦合到两个输出光纤端口。
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引用次数: 3
Increasing the bandwidth utilization of a wireless optical broadband access network through efficient routing 通过高效的路由,提高无线光宽带接入网的带宽利用率
Syed Abis Zaheer, S. Tanwir, M. Ramzan, S. Zaidi
Hybrid wireless optical broadband access networks are the future of internet service providers. Due to high capacity and flexibility, they are the most promising architecture for last mile internet access. Addressing the fact that deployed radios in the wireless part of WOBAN are under-utilized in current routing algorithms, half of the links remain idle while few of these links are carrying traffic, which result in greater link delays. In this paper we present an efficient routing algorithm to make use of under-utilized radios in WOBAN. We develop ‘Flow Limited Routing Algorithm (FLRA)’. Our technique shows significant improvement in system delay compared to existing solutions.
混合无线光宽带接入网是互联网服务提供商的未来。由于高容量和灵活性,它们是最后一英里互联网接入最有前途的架构。在当前的路由算法中,部署在WOBAN无线部分的无线电未得到充分利用,因此一半的链路处于空闲状态,而这些链路中很少有承载流量的链路,这导致了更大的链路延迟。本文提出了一种有效的路由算法来利用WOBAN中未充分利用的无线电。我们开发了流量限制路由算法(FLRA)。与现有的解决方案相比,我们的技术在系统延迟方面有了显著的改善。
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引用次数: 3
Investigation of the effects of network density on the optimal number of clusters in hierarchical Wireless Sensor Networks (WSNs) 网络密度对分层无线传感器网络中最优簇数影响的研究
A. Badi, I. Mahgoub, M. Slavik, M. Ilyas
Wireless sensors are promising and revolutionary technology. The sensor devices are typically deployed in large number to form a communication network for monitoring the physical environment. These devices are battery powered and the lifetime of the device is dependent on the battery's life. Once the battery's energy is depleted, the node is considered dead and is no longer part of the network. Recharging the sensors' batteries is not feasible, and in some cases, is completely impossible. Due to their severe energy constraints and redundancy in sensed data, hierarchal architectures are usually suggested for these networks. These architectures have proven effective in extending the network life several folds. The LEACH network routing protocol is the first protocol to use clustering for energy conservation in Wireless Sensor Networks. LEACH designers observe that there is an ideal percentage of nodes that need to be cluster heads to achieve optimal energy performance. For their work and performance analysis they selected 5% as the number of cluster heads in the netwok. The majority of routing protocols for WSNs follow LEACH and use clustering for energy performance optimization. Most of these protocols have taken the 5% percentage of cluster head as their ideal working setting, without independently qualifying this assumption. In this work, we use simulation modeling to investigate the dependency of this cluster head percentage on the network node density. Our results show that this percentage is not universal for all network settings, and is indeed dependent on the density. These findings will add to the challenging task of WSNs hierarchical networking protocols design.
无线传感器是一项很有前途的革命性技术。传感器设备通常大量部署,形成一个通信网络,用于监控物理环境。这些设备由电池供电,设备的寿命取决于电池的寿命。一旦电池的能量耗尽,节点就被认为是死亡的,不再是网络的一部分。给传感器电池充电是不可行的,在某些情况下是完全不可能的。由于这些网络存在严重的能量约束和感知数据冗余,因此通常建议采用分层结构。这些体系结构已被证明可以有效地将网络寿命延长几倍。LEACH网络路由协议是无线传感器网络中第一个采用聚类节能的协议。LEACH设计者观察到,有一个理想百分比的节点需要成为簇头,以实现最佳的能源性能。对于他们的工作和性能分析,他们选择了5%作为网络中簇头的数量。大多数无线传感器网络的路由协议遵循LEACH并使用聚类进行能量性能优化。这些协议中的大多数都将簇头的5%百分比作为理想的工作设置,而没有独立地对这一假设进行限定。在这项工作中,我们使用仿真建模来研究这种簇头百分比对网络节点密度的依赖关系。我们的结果表明,这个百分比并不适用于所有网络设置,而且确实取决于密度。这些发现将增加wsn分层网络协议设计的挑战性任务。
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引用次数: 11
New attacks and efficient countermeasures for multicast AODV 组播AODV的新攻击及有效对策
Ahmed. M. Abdel Mo'men, H. Hamza, I. Saroit
Security in multicast routing in MANETs is crucial in order to enable effective and efficient multicast-based applications. Multicast Ad-hoc On-demand Distance Vector (MAODV) protocol is one of the well-known multicast routing protocol in MANET. In this paper, we identify and describe, for the first time, three new protocol-dependant attacks on multicast operations of MAODV namely, Group Leader Selection (GLS); False Link Breakage (FLB) and Group Leader Pruning (GLP) attack. For each attack, we implement a scenario to demonstrate the impact of the attack on the performance of the network. Implemented scenarios show a considerable degradation in the Packet Delivery Ratio (PDR) of the protocol. Accordingly, we propose security countermeasures for the identified attacks. Simulation results of the secured and unsecured MAODV show that the proposed countermeasures are effective and efficient. In particular, compared to unsecured MAODV, the proposed countermeasures improve the PDR with 85%
为了实现基于多播的高效应用,多播路由的安全性至关重要。组播自组织按需距离矢量(MAODV)协议是MANET中著名的组播路由协议之一。在本文中,我们首次识别并描述了针对MAODV多播操作的三种新的协议相关攻击,即组领导选择(GLS);FLB (False Link breaking)和GLP (Group Leader Pruning)攻击。对于每种攻击,我们实现一个场景来演示攻击对网络性能的影响。实现的场景显示,该协议的包投递率(PDR)有相当大的降低。据此,我们提出了针对已识别攻击的安全对策。对有担保和无担保MAODV的仿真结果表明,所提出的对策是有效的。特别是,与无担保的MAODV相比,所提出的对策将PDR提高了85%
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引用次数: 18
期刊
7th International Symposium on High-capacity Optical Networks and Enabling Technologies
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