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On the filter narrowing issues in elastic optical networks 弹性光网络中滤波器的缩窄问题
IEEE/OSA Journal of Optical Communications and Networking Pub Date : 2016-07-01 DOI: 10.1364/JOCN.8.000A23
J. Fàbrega, M. Svaluto Moreolo, L. Martin, A. Chiado Piat, E. Riccardi, D. Roccato, N. Sambo, F. Cugini, L. Potí, Shuangyi Yan, E. Hugues-Salas, D. Simeonidou, M. Gunkel, R. Palmer, S. Fedderwitz, D. Rafique, T. Rahman, H. de Waardt, A. Napoli
{"title":"On the filter narrowing issues in elastic optical networks","authors":"J. Fàbrega, M. Svaluto Moreolo, L. Martin, A. Chiado Piat, E. Riccardi, D. Roccato, N. Sambo, F. Cugini, L. Potí, Shuangyi Yan, E. Hugues-Salas, D. Simeonidou, M. Gunkel, R. Palmer, S. Fedderwitz, D. Rafique, T. Rahman, H. de Waardt, A. Napoli","doi":"10.1364/JOCN.8.000A23","DOIUrl":"https://doi.org/10.1364/JOCN.8.000A23","url":null,"abstract":"This paper describes the problematic filter narrowing effect in the context of next-generation elastic optical networks. First, three possible scenarios are introduced: the transition from an actual fixed-grid to a flexi-grid network, the generic full flexi-grid network, and a proposal for a filterless optical network. Next, we investigate different transmission techniques and evaluate the penalty introduced by the filtering effect when considering Nyquist wavelength division multiplexing, single side-band direct-detection orthogonal frequency division multiplexing, and symbol-rate variable dual polarization quadrature amplitude modulation. Also, different approaches to compensate for the filter narrowing effect are discussed. Results show that the specific needs per each scenario can be fulfilled by the aforementioned technologies and techniques or a combination of them, when balancing performance, network reach, and cost.","PeriodicalId":371742,"journal":{"name":"IEEE/OSA Journal of Optical Communications and Networking","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131255563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 50
Elastic optical networks: Introduction 弹性光网络:简介
IEEE/OSA Journal of Optical Communications and Networking Pub Date : 2016-07-01 DOI: 10.1364/JOCN.8.00EON1
A. Napoli, A. Lord
{"title":"Elastic optical networks: Introduction","authors":"A. Napoli, A. Lord","doi":"10.1364/JOCN.8.00EON1","DOIUrl":"https://doi.org/10.1364/JOCN.8.00EON1","url":null,"abstract":"This short introductory paper sets the scene for this special edition of the Journal of Optical Communications and Networking, which is focused on elastic optical networks (EONs). A brief overview of the field is given, followed by a summary of the five invited papers. This special edition is designed to provide a review of current EON technology.","PeriodicalId":371742,"journal":{"name":"IEEE/OSA Journal of Optical Communications and Networking","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130706851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Parameter selection in optical networks with variable-code-rate superchannels 变码率超级信道光网络的参数选择
IEEE/OSA Journal of Optical Communications and Networking Pub Date : 2016-07-01 DOI: 10.1364/JOCN.8.00A152
Andre L. N. Souza, Eduardo J. Mayoral Ruiz, J. Reis, L. Carvalho, Juliano R. F. Oliveira, D. Arantes, M. H. M. Costa, D. Mello
{"title":"Parameter selection in optical networks with variable-code-rate superchannels","authors":"Andre L. N. Souza, Eduardo J. Mayoral Ruiz, J. Reis, L. Carvalho, Juliano R. F. Oliveira, D. Arantes, M. H. M. Costa, D. Mello","doi":"10.1364/JOCN.8.00A152","DOIUrl":"https://doi.org/10.1364/JOCN.8.00A152","url":null,"abstract":"Future flexible transceivers will be able to adjust modulation format, number of subcarriers, symbol rate, and forward error correction (FEC) scheme, according to channel and network conditions. This paper uses a combination of theoretical derivations and experimental results to recommend the best set of parameters to satisfy a specific demand to be routed along the network. In particular, for a given required transparent reach and desired net bit rate, and assuming an FEC scheme with a constant gap to capacity, the paper provides a set of modulation format, number of subcarriers, symbol rate, and code rate, which requires minimum bandwidth, while offering a conveniently low bit error rate (in optical systems, typically 10-15). We observed that optimum operating points required FEC schemes with overheads ranging from almost 0 to 145%, which is an important guideline for future flexible optical communications systems.","PeriodicalId":371742,"journal":{"name":"IEEE/OSA Journal of Optical Communications and Networking","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130715920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Potentialities and criticalities of flexible-rate transponders in DWDM networks: A statistical approach DWDM网络中灵活速率转发器的潜力和关键:一种统计方法
IEEE/OSA Journal of Optical Communications and Networking Pub Date : 2016-07-01 DOI: 10.1364/JOCN.8.000A76
M. Cantono, R. Gaudino, V. Curri
{"title":"Potentialities and criticalities of flexible-rate transponders in DWDM networks: A statistical approach","authors":"M. Cantono, R. Gaudino, V. Curri","doi":"10.1364/JOCN.8.000A76","DOIUrl":"https://doi.org/10.1364/JOCN.8.000A76","url":null,"abstract":"We propose a novel method to assess physical layer potentialities of core optical networks aimed at finding solutions that better exploit the installed equipment. We focus on the use of flexible-rate transponders for the implementation of the elastic paradigm on the state-of-the-art dense wavelength-division-multiplexed fixed-grid network scenarios. We make use of the waveplane-based routing and wavelength assignment algorithm presented in Dai et al. [J. Lightwave Technol., vol. 33, p. 3815, 2015] to implement a progressive statistical loading of the analyzed network topology, and perform a Monte Carlo analysis delivering a statistical characterization of the average bit rate per lightpath together with the assessment of network blocking. The proposed method allows for the identification of criticalities in terms of link congestion and lightpath quality of transmission, addressing solutions by identifying network bottlenecks. We apply the proposed method to a large pan-European network topology comparing two different transmission techniques for the implementations of flexible-rate transponders: pure PM-m-QAM versus hybrid modulation formats. Over this realistic network example, besides displaying the overall statistics for the average bit rate per lightpath, we show statistics for critical lightpaths and congested fiber links.","PeriodicalId":371742,"journal":{"name":"IEEE/OSA Journal of Optical Communications and Networking","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114363483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 39
Networking aspects for next-generation elastic optical interfaces 下一代弹性光接口的组网问题
IEEE/OSA Journal of Optical Communications and Networking Pub Date : 2016-07-01 DOI: 10.1364/JOCN.8.00A116
B. Clouet, J. Pedro, N. Costa, M. Kuschnerov, A. Schex, J. Slovak, D. Rafique, A. Napoli
{"title":"Networking aspects for next-generation elastic optical interfaces","authors":"B. Clouet, J. Pedro, N. Costa, M. Kuschnerov, A. Schex, J. Slovak, D. Rafique, A. Napoli","doi":"10.1364/JOCN.8.00A116","DOIUrl":"https://doi.org/10.1364/JOCN.8.00A116","url":null,"abstract":"Next-generation elastic optical interfaces will support a wide range of line rates and modulation formats. Such transmission schemes enable doubling of the channel capacity at the expense of a lower reach, whereas a flexible DWDM grid supports the transport of multiple optical signals within a single frequency slot by packing them closely, thus saving spectral resources. The resulting multitude of options on the line side provides network planners the capability to derive the most suitable one for each individual path inside the network. However, planning and operational complexity should not be overlooked, since aspects such as added spectrum fragmentation can hamper the expected network improvements. This paper investigates how to obtain the best compromise between harnessing the main benefits of next-generation optical interfaces, while keeping the complexity of the underlying system at a reasonable level. In particular, we define a novel network spectral efficiency (SE) metric that enables, on one hand, to highlight the relevance of supporting a flexible grid to improve SE and, on the other hand, to demonstrate that the grid granularity can be based on coarser 50 GHz increments without major penalties. The effectiveness of this parameter has been verified by considering two reference network topologies. Finally, the paper also discusses how future optical interface technology developments will shape network design.","PeriodicalId":371742,"journal":{"name":"IEEE/OSA Journal of Optical Communications and Networking","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115935349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Demonstration of quasi-contentionless flexible ROADM based on a multiport WXC 基于多端口WXC的准无争议柔性ROADM的演示
IEEE/OSA Journal of Optical Communications and Networking Pub Date : 2016-07-01 DOI: 10.1364/JOCN.8.00A141
Liangjia Zong, Han Zhao, Yunfei Yan, Zhiyong Feng
{"title":"Demonstration of quasi-contentionless flexible ROADM based on a multiport WXC","authors":"Liangjia Zong, Han Zhao, Yunfei Yan, Zhiyong Feng","doi":"10.1364/JOCN.8.00A141","DOIUrl":"https://doi.org/10.1364/JOCN.8.00A141","url":null,"abstract":"Colorless, directionless, and contentionless (CDC) are considered to be three important features for next-generation reconfigurable optical add/drop multiplexer (ROADM) nodes. However, CDC-ROADMs have not been widely deployed due to their relatively higher cost and complexity. In this paper, a compact and multiport wavelength cross connect (WXC) is proposed and demonstrated. Based on the developed WXC, we introduce two novel quasi-contentionless ROADM architectures, which provide considerable reduction of traffic blocking ratio when compared with colorless/directionless (CD)-ROADM architectures. Meanwhile, compared to conventional CDC-ROADMs, the proposed architectures show advantages on cost, intrafiber connection, and system complexity. Experiments are carried out to demonstrate the ability to add/drop two or more identical wavelengths simultaneously in a static network and the flex-grid wavelength routing characteristic of the proposed ROADM nodes. These results indicate that the proposed ROADM solution is a practical and promising trade-off for future elastic optical networks.","PeriodicalId":371742,"journal":{"name":"IEEE/OSA Journal of Optical Communications and Networking","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128781964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Class-of-service-based multilayer architecture for traffic restoration in elastic optical networks 弹性光网络中基于服务分类的多层业务恢复体系结构
IEEE/OSA Journal of Optical Communications and Networking Pub Date : 2016-07-01 DOI: 10.1364/JOCN.8.000A34
Djamel Amar, E. L. Rouzic, N. Brochier, C. Lepers
{"title":"Class-of-service-based multilayer architecture for traffic restoration in elastic optical networks","authors":"Djamel Amar, E. L. Rouzic, N. Brochier, C. Lepers","doi":"10.1364/JOCN.8.000A34","DOIUrl":"https://doi.org/10.1364/JOCN.8.000A34","url":null,"abstract":"In this work, we propose and investigate a class-of-service-based multilayer architecture for traffic restoration in elastic optical networks. This architecture benefits from both data rate elasticity and low quality of service requirements of best-effort traffic in IP-over-WDM optical networks, combining 1 + 1 IP protection for gold traffic and optical restoration for best-effort traffic. Numerical simulations reveal that the proposed architecture can further reduce capital expenditures, even with the significant extra cost of elastic transponders.","PeriodicalId":371742,"journal":{"name":"IEEE/OSA Journal of Optical Communications and Networking","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125031434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Flexgrid technologies enabling BRAS centralization in MANs 灵活的网格技术使BRAS在MANs中集中
IEEE/OSA Journal of Optical Communications and Networking Pub Date : 2016-07-01 DOI: 10.1364/JOCN.8.000A64
M. Svaluto Moreolo, J. Fàbrega, Laura Martín, K. Christodoulopoulos, Emmanouel Varvarigos, J. Fernández-Palacios
{"title":"Flexgrid technologies enabling BRAS centralization in MANs","authors":"M. Svaluto Moreolo, J. Fàbrega, Laura Martín, K. Christodoulopoulos, Emmanouel Varvarigos, J. Fernández-Palacios","doi":"10.1364/JOCN.8.000A64","DOIUrl":"https://doi.org/10.1364/JOCN.8.000A64","url":null,"abstract":"In an evolutionary metro-regional area network (MAN) scenario, targeting the centralization of the broadband remote access server (BRAS), flexgrid technologies can be suitably tailored to be applied. We investigate their applicability, proposing network architecture and data plane solutions to improve the spectrum and network efficiency, while reducing CapEx investment. We first describe the MAN scenario evolution and the envisioned solution based on flexgrid for supporting BRAS centralization. Then, we define the network design problem, propose a solution, and use that to design a realistic regional network (region-A of the Telefonica Spanish network), identifying the transmission requirements for such a representative case. Subsequently, flexgrid data plane solutions are presented, focusing on the design, numerical validation, and experimental assessment of a sliceable bandwidth variable transponder based on orthogonal frequency division multiplexing. We propose an architecture able to meet the identified requirements, supporting flexgrid connections of up to 50 Gb/s per flow over a six-hop path of 545 km. Furthermore, an alternative scheme for the uplink is given and experimentally demonstrated in a four-node photonic mesh network. Finally, the techno-economic viability of the proposed solution is evaluated in comparison with current practice solutions.","PeriodicalId":371742,"journal":{"name":"IEEE/OSA Journal of Optical Communications and Networking","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115045839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Optical fibers for flexible networks and systems [Invited] 柔性网络和系统用光纤[特邀]
IEEE/OSA Journal of Optical Communications and Networking Pub Date : 2016-07-01 DOI: 10.1364/JOCN.8.0000A1
J. Downie, Ming-Jun Li, S. Makovejs
{"title":"Optical fibers for flexible networks and systems [Invited]","authors":"J. Downie, Ming-Jun Li, S. Makovejs","doi":"10.1364/JOCN.8.0000A1","DOIUrl":"https://doi.org/10.1364/JOCN.8.0000A1","url":null,"abstract":"The attributes and characteristics of optical transmission fibers have evolved over the years to accommodate different system technologies and optimize overall system performance. In the emerging era of elastic or flexible networks, optical fibers will continue to play a key role in determining system reach and capacity. In this paper, we examine key characteristics of optical fibers for coherent transmission systems and review recent results that highlight the performance differences observed between fiber designs and between data rates such as 100 and 200 Gbits/s per channel that describe transceivers in current and near-future flexible networks.","PeriodicalId":371742,"journal":{"name":"IEEE/OSA Journal of Optical Communications and Networking","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115155902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Design and analysis of green optical line terminals for TDM passive optical networks TDM无源光网络绿色光线路终端的设计与分析
IEEE/OSA Journal of Optical Communications and Networking Pub Date : 2015-08-24 DOI: 10.1364/JOCN.8.000221
M. Taheri, N. Ansari
{"title":"Design and analysis of green optical line terminals for TDM passive optical networks","authors":"M. Taheri, N. Ansari","doi":"10.1364/JOCN.8.000221","DOIUrl":"https://doi.org/10.1364/JOCN.8.000221","url":null,"abstract":"This paper proposes a novel scheme that can efficiently reduce the energy consumption of optical line terminals (OLTs) in time division multiplexing passive optical networks (PONs) such as ethernet PONs and gigabit PONs. Currently, OLTs consume a significant amount of energy in PONs, which is one of the major fiber-to-the-X technologies. To be environmentally friendly, it is desirable to reduce energy consumption of OLTs as much as possible, a requirement that becomes even more urgent as OLTs keep increasing their provisioning data rate; higher data rate provisioning usually implies higher energy consumption. In this paper, we propose a novel energy-efficient OLT structure that guarantees services to end users with the smallest number of power-on OLT line cards. More specifically, we adapt the number of power-on OLT line cards to the real-time incoming traffic. Also, in order to avoid service disruption resulting from powering off OLT line cards, proper optical switches are equipped in OLT to dynamically configure the communications between OLT line cards and optical network units.","PeriodicalId":371742,"journal":{"name":"IEEE/OSA Journal of Optical Communications and Networking","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131743756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
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