ROADM技术的应用分析与新型设备形态的构想

随着光传送网(OTN)的广泛商用,可重构型光分插复用器(ROADM)技术逐渐成为OTN的重要光节点技术.文章分析了ROADM的3种主要技术,并针对不同的网络用途给出了选用建议.最后提出一种复合型ROADM设备形态,该设备形态结合了波长阻断器和波长选择开关型ROADM技术的优点,具有更强的适用性.     

基于WB的ROADM实现及光通道OSNR代价分析

文章从业务发展的需求出发,详细讨论了可重构光分插复用器(ROADM)设备的优点,提出了一种基于波长阻塞器(Wavelength Blocker,WB)的ROADM实现方案,并针对实际应用测试了该ROADM节点设备的最大光信噪比(OSNR)代价.结果表明这种ROADM节点设备满足应用的需求.     

基于波长选择开关的ROADM实现研究

可重构光分插复用(ROADM)设备可以通过软件实现远程节点上、下路和直通波长的配置.文章首先介绍了ROADM设备结构的演进过程,然后通过比较基于波长选择开关(WSS)的结构的ROADM设备,采用不同逻辑实现方式获得了不同特性,最后探讨了WSS的实现技术.     

ROADM技术及应用分析

随着OTN 100G技术的发展和400G时代的来临,光交叉开始被越来越多的研究和应用,可重构式光分插复用技术(ROADM)是近年来兴起的一种新型光网络节点技术,它在传统WDM网络节点技术OADM的基础上,通过改进措施,使之具有灵活的光波长调度能力,是OTN技术在光域内理想的网络节点形式.本文主要介绍ROADM技术构成原理,并分析在项目中的应用.     

ROADM全光交换网络关键技术发展与应用展望

介绍了可重构光分插复用器（reconfigurable optical add/drop multiplexer，ROADM）网络的发展历程、ROADM技术方案以及国内ROADM网络的部署情况。全面阐述了ROADM关键技术的发展方向，包括光交叉连接（optical cross-connect，OXC）设备、高维度波长选择开关（wavelength selected switch，WSS）、波长无关/方向无关/竞争无关ROADM （colorless/directionless/contentionless ROADM，CDC-ROADM）、400 Gbit/s FlexGrid ROADM、下一代波长交换光网络（next-generation wavelength switched optical network，WSON2.0）智能控制平面技术。分析了现有ROADM网络应用场景与技术发展趋势，展望了ROADM全光交换网络未来发展前景。     

基于衍射MEMS的广播选择型ROADM设计与研究

设计了一种广播选择型的可重构光分插复用(ROADM)节点的体系结构,通过波长阻塞器和可调滤波器实现了动态的波长分插复用功能,讨论了基于衍射MEMS技术实现波长阻塞的原理,并对其结构进行了改进以增强系统功能。     

ROADM设备网管系统的实现

可重构的光分插复用(ROADM)设备是光传送网的重要节点,通过软件配置,可以灵活实现波长上下,使网络具备重构功能.建立基于SNMP协议的网元管理系统是保证ROADM设备稳定灵活工作的前提,文章简述了ROADM设备的功能结构,并讨论了设备网管系统的建立和配置功能的软件实现.     

一种新型四端口同侧可重构光分插复用器的结构设计

采用分立光器件技术,设计了一种新型的四端口同侧的可重构光分插复用器(ROADM),其上路、输入、输出、下路四个端口自上而下依次排列并且位于ROADM的同一侧.该ROADM基于GRIN透镜和多层介质薄膜滤波器,通过单片机控制步进电机,驱动滤波器沿精密微型导轨移动,可实现不同波长的分插复用.     

ROADM结构与技术的演进

介绍了可重构光分插复用器(ROADM)设备实现结构从第一代到第三代和使用技术从波长阻断(WB)器、平面光波导(PLC)到波长选择开关(WSS)的演进过程.给出了基于WSS模块构成的更具灵活性的第三代ROADM,并分析了其“无色”、“无方向性”和“无竞争性”的特点.最后,对三代ROADM各自的应用特点进行了小结.     

基于并联结构的M-Z型可重构光分插复用器

研究了一种具有模块化结构与升级能力的可重构光分插复用器(ROADM).每个模块由基于光纤布拉格光栅(FBG)的M-Z干涉仪(MZI)、1×2的光开关和Y型合波器构成.通过调整各模块中的光开关,该ROADM能够在1个下载端和上载端分别同时下路和上路任意单波长信号或多波长复用信号.设计并分析了4级并联的梯状式ROADM,由传输矩阵导出各种波长下载状态的路由控制表.实验结果表明,该ROADM能够减小输出功率不均衡的问题,在直通、下载和上载3种状态下的平均插入损耗均小于3 dB,信号间的隔离度大于20 dB.     

Comparison Study on Three Different Reconfigurable Optical Add Drop Multiplexer Architectures

In this paper, we present the evolution of reconfigurable optical add drop multiplexer（ROADM） technologies, and compare three main ROADM architectures available on the market today. Three archhectures include broadcast-select and demux-switch-mux[and the integrated version planar lightwave circuit（PLC）] and wavelengths-selective switch.     

ROADM技术简介及演进方向

阐述了可重构型光分插复用设备(ROADM)进入波分网络的背景,并对ROADM的3种主要技术进行了简要介绍。最后提出未来ROADM的发展方向,即ROADM光层调度 OTN电层调度组合解决方案,以及中兴通讯推出的适应市场发展的设备功能类型。     

Digital optical networks using photonic integrated circuits (PICs) address the challenges of reconfigurable optical networks

To reduce costs and simplify operations, carriers are deploying flexible optical networks that can be easily reconfigured and managed remotely. This article provides an overview of typical all-optical reconfigurable optical add/drop multiplexer (ROADM) systems and their associated network issues. We describe a novel digital optical network architecture based on digital ROADM systems, which use photonic integrated circuits (PICs) to overcome many of these issues. Digital ROADM systems use monolithic PICs to integrate over 60 discrete optical components, including lasers, modulators and detectors, into a single pair of optical components, allowing cost-effective optical-electrical-optical conversion at every node. This also allows key functions such as service reconfiguration, add/drop and protection to be implemented in the digital domain, and enables de-coupling of service provisioning from optical link engineering, termed bandwidth virtualization. Finally, key deployment, reliability and operational metrics for PIC-based digital ROADM systems are presented.     

Novel node upgradation strategy for migration to elastic optical networks

For migration from dense wavelength division multiplexing (DWDM) networks to elastic optical networks (EON),it is required to upgrade the traditional reconfigurable optical add-drop multiplexer (ROADM) to the new-generation ROADM that supports flexible grids.However,for a large-scale optical network,it is generally impossible to upgrade the ROADM nodes all in once; rather,they would be upgraded gradually.For this,it is critical to study different strategies for selecting the ROADM nodes to be upgraded.Also,for the interconnection between different generations of ROADM,the sub-band virtual concatenation (VCAT) technique was employed to enable an optical channel to be established via traversing different types of nodes.An integer liner programming (ILP) model and an efficient heuristic algorithm were developed to jointly select the ROADM nodes to upgraded and assign spectrum resources.Simulation studies show that the proposed strategy for the upgraded node selection is efficient to perform close to the ILP model in terms of the maximum number of FS used in the whole network.     

ROADM技术发展与标准化研究

本文研究了ROADM的技术优势，主要结构类型，涉及的关键技术以及存在的问题，并分析了当前ROADM标准化进展情况与发展趋势，还介绍了当前设备现状和现网应用情况。     

GMPLS控制ROADM的光传送网结构和路由协议扩展

ROADM提供了光网络的灵活性和重配置能力,GMPLs是多层次交换网络统一的控制平面.在介绍ROADM技术和CMPLS协议的基础上,描述了由GMPLS控制ROADM构成的光网络结构,并完成扩展GMPLS路由协议以支持在ROADM端口约束条件下的路由.     

可重构光分插复用器(ROADM)的技术实现与性能评估

从光网络节点的功能要求出发,详细讨论了开关型和调谐型两大类ROADM的技术实现方案,并对各种ROADM技术的性能进行了比较分析。