A broadcast-and-select ROADM architecture to support linear hub-ended trees using point-to-multipoint coherent transceivers [Invited]

IF 4 2区 计算机科学 Q1 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE
Nina Skorin-Kapov;Pablo Pavon-Marino;Marco Quagliotti;Emilio Riccardi;Antonio Napoli;Joao Pedro;Oscar Gonzalez de Dios
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引用次数: 0

Abstract

Point-to-multipoint (P2MP) coherent pluggable transceivers based on digital subcarrier multiplexing (DSCM) have been proposed as a promising technology to reduce the costs of optical transport networks. However, to establish the P2MP trees, bidirectional multicast functionality is required at the optical nodes. While conventional broadcast-and-select (B&S) wavelength selective switch (WSS)-based reconfigurable optical add/drop multiplexer (ROADM) architectures can inherently perform splitting operations, merge operations of DSCM signals face internal blocking in conventional WSSs since they require switching signals from different input ports on the same carrier wavelength (although using different subcarriers) to the common output port. In this paper, we propose an alternative ROADM architecture requiring a simple low-cost modification, which can support P2MP trees, provided that they are routed as linear chains with the hub node at one end, without requiring multicast-enabled WSSs. We evaluate the potential savings of linear hub-ended P2MP trees on a metro reference scenario using a modified tree-determination, routing, and spectrum assignment (TRSA) dimensioning algorithm. Results indicate that linear hub-ended trees can significantly reduce transceiver costs with respect to point-to-point (P2P) solutions in all considered cases, with savings ranging from 6%–28% depending on the traffic load. While these savings are somewhat less than those achievable with arbitrary P2MP trees and latency is slightly higher, spectrum waste is reduced by employing linear routing, and the trees can be supported by the proposed architecture.
使用点对多点相干收发器支持线性集线器端树的广播选择ROADM架构[特邀]
基于数字子载波复用(DSCM)的点对多点(P2MP)相干可插拔收发器是一种降低光传输网络成本的有前途的技术。然而,为了建立P2MP树,需要在光节点上实现双向组播功能。传统的基于广播和选择(B&S)波长选择开关(WSS)的可重构光加/丢多路复用器(ROADM)架构可以固有地执行分裂操作,而DSCM信号的合并操作在传统的WSS中面临内部阻塞,因为它们需要将来自同一载波波长(尽管使用不同的子载波)的不同输入端口的信号切换到公共输出端口。在本文中,我们提出了一种替代的ROADM架构,需要一个简单的低成本修改,它可以支持P2MP树,只要它们作为线性链路由,hub节点在一端,而不需要支持组播的wss。我们使用一种改进的树确定、路由和频谱分配(TRSA)维度算法,评估了在地铁参考场景下线性中心端P2MP树的潜在节省。结果表明,在所有考虑的情况下,相对于点对点(P2P)解决方案,线性中心端树可以显著降低收发器成本,根据流量负载的不同,节省的成本在6%-28%之间。虽然这些节省比任意P2MP树所能实现的节省要少一些,并且延迟略高,但通过采用线性路由减少了频谱浪费,并且所提议的架构可以支持树。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.40
自引率
16.00%
发文量
104
审稿时长
4 months
期刊介绍: The scope of the Journal includes advances in the state-of-the-art of optical networking science, technology, and engineering. Both theoretical contributions (including new techniques, concepts, analyses, and economic studies) and practical contributions (including optical networking experiments, prototypes, and new applications) are encouraged. Subareas of interest include the architecture and design of optical networks, optical network survivability and security, software-defined optical networking, elastic optical networks, data and control plane advances, network management related innovation, and optical access networks. Enabling technologies and their applications are suitable topics only if the results are shown to directly impact optical networking beyond simple point-to-point networks.
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