Impact of ROADM Colorless, Directionless, and Contentionless (CDC) Features on Optical Network Performance [Invited]

Li, Yongcheng; Gao, Li; Shen, Gangxiang; Peng, Limei

doi:10.1364/jocn.4.000b58

Cited by 66 publications

(42 citation statements)

References 19 publications

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“…Such types of nodes, which are remotely configurable, are also known as OXCs whose add/drop ports can be colorless (C)/directionless (D)/contentionless (C). In this study, we use an OXC architecture with the C/D/C feature, since such an OXC demonstrates the best lightpath blocking probability performance [19] .…”

Section: Journal Of Communications and Information Network Of Segmenmentioning

confidence: 99%

Investigation of cost, power, and spectral efficiency in fixed- and flexi-grid networks

Iyer

Singh

2017

J. Commun. Inf. Netw.

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With the steady growth of traffic volume in core networks, it is predicted that future optical network communication will be constrained mainly by cost and power consumption. Thus, for Internet sustainability, it will be necessary to ensure cost and power efficiency in optical networks. The aims of this study are (i) to identify the main sources of cost and power consumption in fixed-grid (SLR and MLR) and flexi-grid (OFDM) optical networks, and (ii) to compare techniques for improving cost and power efficiency in SLR/MLR-and OFDM-based networks. To this end, we conducted a comparative analysis of cost and power efficiency for the OFDM-and MLR/SLR-based networks, and considering realistic networks, evaluated the cost and power consumed by different components in the optical layer. Our results show that (i) OFDM-based networks outperform those based on MLR/SLR in terms of both cost and power-efficiency, (ii) the extra equipment cost incurred due to under-utilization of spectrum is reduced by switching to a flexi-grid network, (iii) lower power consumption per bit is obtained when the networking solution ensures a finer bit-rate granularity, and (iv) there exists a power and spectrum minimization trade-off that is network characteristic dependent.

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Section: Journal Of Communications and Information Network Of Segmenmentioning

confidence: 99%

Investigation of cost, power, and spectral efficiency in fixed- and flexi-grid networks

Iyer

Singh

2017

J. Commun. Inf. Netw.

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“…Specifically, the OMCN provides transfer of information between the Metro and Core Network; the OAN is the network element to provide connectivity between the Metro Network and Datacenters or 5G-Fronthault Networks; and the ONU between the Access Network and the final Users. Figure 2 shows an example of architecture of a bidirectional ROADM with colorless and directionless (CD) features [7][8][9] that can be used in the proposed scenario shown in Fig. 1 in which both Metro Network and Access Network transmission systems are based on single bidirectional fiber links and the considered multiplexing technique is u-DWDM, characterized by dividing each WDM channel into smaller channels called frequency slots (FS) [10].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it enables the coverage of both C and L bands. In that case, the cost-effective ROADM works as a CD all-optical node at DWDM channel level [7][8][9], while the WSS-based reference ROADM, Fig. 2, is a CD ROADM node at FS level.…”

Section: Introductionmentioning

confidence: 99%

Cost-Effective DWDM ROADM Design for Flexible Sustainable Optical Metro–Access Networks

Sarmiento¹,

Altabás²,

Izquierdo³

et al. 2017

J. Opt. Commun. Netw.

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Abstract-Architectural changes are required at the underlying networks to support the expected Internet data traffic volume growth caused by the popularization of cloud services, 5G-based services, and social networks, whereas providing a highly dynamic connectivity. Cost-effective and energy efficient solutions for flexible network subsystems are required in order to provide future sustainable networks. In this paper, we present a cost-effective DWDM ROADM design enabling optical Metro-Access networks convergence. The cost-effective DWDM ROADM capabilities have been also assessed in an ultra-Dense Wavelength Multiplexing (u-DWDM) Ring Network scenario. In particular, the achievable network throughput has been considered. Index Terms-DWDM; ROADM; Throughput. I. INTRODUCTIONhe ICT eco-system has been rapidly and dramatically changing in the last years. New multimedia and cloud services, the deployment of the Internet of Things (IoT) and the convergence between optical and wireless communications at the 5G paradigm [1] are requiring changes to the networks in order to enable scalable growth in traffic volume, while supporting a high level of dynamic connectivity, full flexibility and increased energy-efficiency. These features can be achieved by considering the cooperation between the network control and data planes. On the one hand, the management and control of networks are evolving towards a Software Defined Networking (SDN)-based centralized architecture (see Fig. 1 accomplished by the subdivision of a DWDM channel into smaller channels called frequency slots (FS) wherein the uplink (U) and the down-link (D) for each user can be established (see Fig. 1). This paper is divided into five sections. Section II presents the proposed cost-effective DWDM Reconfigurable Optical Add-Drop Multiplexer (ROADM) node design, its operation modes and the main advantages of the proposed ROADM architecture. Section III presents the insertion loss, sensitivity and crosstalk measurements and their experimental set-up used for the ROADM characterization. Section IV presents the considered u-DWDM network scenario for proving the cost-effective DWDM ROADM capabilities; an iterative process to design each costeffective DWDM ROADM is proposed in order to obtain the achievable network throughput.Finally, Section V completes the paper with the main conclusions. II. DWDM ROADM NODE ARCHITECTUREThe ROADM design for future Metro-Access converged Networks is basically driven by new network-level requirements, such as full flexibility, adaptability, scalability, resilience and increased energy-efficiency [5]. In order to reach all those features, a new cost-effective

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“…Network operators generally exploit the flexibility and reconfigurability of reconfigurable optical add/drop multiplexers (ROADMs) in backbone networks to deliver lower CAPEX and OPEX, since they can respond quickly to network status changes, such as fiber cut, establishing or releasing lightpaths [4,5]. Especially, network carriers expect to drop the same wavelengths from multiple nodal directions freely and thereby avoid intra-node wavelength blocking constraints [6].…”

Section: Introductionmentioning

confidence: 99%

Evaluations for transponder utilizations of two active–standby banks in CD-ROADM optical networks with traffic grooming

et al. 2016

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Reconfigurable optical add/drop multiplexers (ROADMs) are being widely deployed by network carriers in transparent optical networks to increase dynamicity and flexibility. Next-generation ROADMs request colorless, directionless, and contentionless (CDC) features. We evaluate static lightpath blocking performance with different transponder (TP) bank sizes (i.e., number of TP used), to optimize the TP configuration in colorless and directionless ROADMs (CD-ROADMs), while maintaining similar blocking performance as that for a pure contentionless ROADM. In this paper, we introduce an integer linear programming model considering intra-node resource limitations. To achieve scalability, we develop an efficient heuristic algorithm which also takes into account the ROADM add/drop structure. Simulation results show that the two active-standby banks in the CD-ROADM node are able to provide the contentionless feature. Furthermore, the number of TPs in the standby bank can be reduced to 37.5 % of that in the active bank, where TP number is same as the number of wavelengths in each fiber link, in order to simplify CD-ROADM configurations and to reduce its implementation cost. The causes of traffic blocking in the CD-ROADM optical networks are also analyzed. B Min Zhu

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Impact of ROADM Colorless, Directionless, and Contentionless (CDC) Features on Optical Network Performance [Invited]

Cited by 66 publications

References 19 publications

Investigation of cost, power, and spectral efficiency in fixed- and flexi-grid networks

Investigation of cost, power, and spectral efficiency in fixed- and flexi-grid networks

Cost-Effective DWDM ROADM Design for Flexible Sustainable Optical Metro–Access Networks

Evaluations for transponder utilizations of two active–standby banks in CD-ROADM optical networks with traffic grooming

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