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Optical Network Design and Modeling (ONDM), 2010 14th Conference on

Date 1-3 Feb. 2010

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  • [Title page]

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  • Preface

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  • Sponsors

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  • Papers [table of contents]

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  • Author index

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  • Large scale optical test-beds for network research and innovation

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  • Photonic network vision and its contribution to the environmental policy in Japan

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  • Multi-granular traffic scheduling in hybrid optical interconnection

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (153 KB) |  | HTML iconHTML  

    Multi-granular traffic is considered as the traffic generated by the high variety of applications supported by future Internet. Hybrid interconnection is a viable way to achieve the high throughput and flexibility required in the optical nodes with available optical and electronic technology. The task of finding a way to efficiently match these two key aspects is a challenge for possible short term exploitation of optical technology in dynamic networking. In this paper, multi-granular traffic representation and scheduling to exploit hybrid switch resources are proposed, while differentiating traffic classes. Loss and delay are evaluated by simulation based on a simplified ON/OFF model of the input traffic mix, which is able to take some key aspects of multi-granular traffic, such as burstiness and quality of service requirements, into account. Results outline the class isolation capabilities of the proposed scheduling algorithm and the achievements in terms of time and semantic transparency. View full abstract»

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  • Performance modeling of optical transmission systems through pearson fitting and multicanonical Monte-Carlo simulations

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (3949 KB) |  | HTML iconHTML  

    In this paper we propose and compare two different methods, based either on multicanonical Monte-Carlo (MMC) simulations or Pearson fitting, for performance evaluation of realistic wavelength-division-multiplexed (WDM) optical transmission systems. Both methods are able to account for linear and nonlinear propagation effects, and can be applied to any modulation format. As regards MMC, we estimate the distribution of the received sample, accounting for noise, inter-symbol interference (ISI) and inter-channel nonlinearities, by adopting a combined noise and pattern perturbation method. As an alternative to simulations, Gaussian or chi-square fitting techniques have been proposed in the literature. Anyway, none of them is able to provide accurate performance estimation for both on-off keying (OOK) and differential (quadrature) phase-shift keying (D(Q)PSK) modulations. In this work we show that the pdf of the received sample is well approximated by Pearson distributions in all the above-mentioned cases. Pearson distributions are completely determined by their first four moments, which can be estimated by standard Monte Carlo (MC) simulations with less computational burden than typically needed by the MMC method. Finally, for each modulation format, we assess the accuracy of the various fitting techniques by comparing the fitted distributions with those obtained by either MMC simulations in the nonlinear propagation regime, or exact analytical methods in the linear propagation regime. View full abstract»

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  • Virtual circuit allocation with QoS guarantees in the ECOFRAME optical ring

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (5255 KB) |  | HTML iconHTML  

    We present the ECOFRAME metro ring network and how we can provide virtual circuit emulation with QoS guarantee at a subwavelegth level. The architecture is based on a centralized HUB and reservations. The scheduler in the HUB reserves a set of rectangles, called a pattern to describe the slots allocated to a node. We study the tradeoff between the complexity of the reservation at the HUB level and the performance of the network: distribution of the end to end delay and utilization of the ring. View full abstract»

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  • Application of performance monitor using pre-scaled clock-tone detection technique to 160-Gb/s RZ-BPSK signal and 40-Gb/s NRZ-OOK signal

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (7260 KB) |  | HTML iconHTML  

    The performance monitoring technique using pre-scaled clock-tone detection was proposed and the principle of the technique was explained. The technique has advantage of simple contracture with very low electrical bandwidth. In addition, applicability of proposed techniques to 160-Gb/s RZ-BPSK signal and 40-Gb/s NRZ-OOK signal was discussed. In spite of the lack of clock-tone spectra in BPSK signal, the proposed technique generates the pre-scaled signal and is able to detect waveform distortion by chromatic dispersion and OSNR degradation. Furthermore, possibility to separate the distortion origin of 40-Gb/s NRZ-OOK signal was reveled by adding revealed 25-ps and 12.5-ps delayed interferometer. View full abstract»

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  • Energy efficient network design tool for green IP/Ethernet networks

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1542 KB) |  | HTML iconHTML  

    New energy efficient network design algorithm and tool for low power consumption named MIDORI is proposed. Network is used minimum set of nodes and links which can transfer all communication traffic under QoS restriction. QoS restrictions are included hop limit, bandwidth limit reliability and stability. Set-covered problem is applied to this algorithm and all links are modeled as ¿1¿ for on and ¿0¿ for off. To solve the optimum network configuration, parallel data flow type reconfigurable processer, DAPDNA is applied to solve this problem efficiently. The processor automatically produces the node/link set and confirms traffic QoS requirements. This algorithm can achieve optimum network resources. According to our evaluation results, it can achieve more than 25% higher efficient than conventional holistic algorithm. And also the evaluation results show the 2 decade faster calculation than conventional sequential method using Pentium II processor. Using the design tool and newly developed remote power controlled L2 switch, experimental network is now under development. Using the proposed algorithm and tool, energy efficient IP/Ethernet network can be realized. We can estimate that it can reduce about 38 K ton CO2 par year. View full abstract»

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  • A novel WDM-based optical access network with high energy efficiency using Elastic OLT

    Page(s): 1 - 6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (681 KB) |  | HTML iconHTML  

    This paper presents a novel access network architecture that includes the concept of ¿Elastic OLT¿ with a view to saving power. This architecture saves power by adapting to the physical rate of the signal. The adaptation policy is based on the full utilization of the power budget, which increases as the physical rate decreases. Making full use of the power budget is based on the idea that surplus power budget constitutes a waste of power. The surplus power budget is exhausted by extending the transmission distance and increasing the splitting ratio, which are both realized by Elastic OLT. Calculation and design for determining the optimal network parameters are performed. The results confirm the validity of the proposed method. View full abstract»

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  • Power-efficient multi-layer networking: design and evaluation

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (707 KB) |  | HTML iconHTML  

    With the exponential growth in the amount of Internet traffic, power consumption in the networking field has become a paramount issue. This paper focuses on the design of power-efficient multi-layer networks that comprise both the optical layer and the Internet Protocol (IP) layer, and analyzes several approaches such as power-efficient routing of lightpaths and power-efficient configuration of network devices. Based on practical network equipment and network architecture, this paper proposes a set of complete mathematical formulations to model comparatively complicated multi-layer networks, and utilizes Integer Linear Programming (ILP) to investigate the power-conservation effect through optimization. Simulation results indicate that significant power can be conserved with the power-efficient network design. View full abstract»

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  • Saving energy in IP-over-WDM networks by switching off line cards in low-demand scenarios

    Page(s): 1 - 6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (158 KB) |  | HTML iconHTML  

    We estimate potential energy savings in IP-over-WDM networks achieved by switching off router line cards in low-demand hours. We compare three approaches to react on dynamics in the IP traffic over time, FUFL, DUFL and DUDL. They provide different levels of freedom in adjusting the routing of lightpaths in the WDM layer and the routing of demands in the IP layer. Using MILP models based on realistic network topologies and node architectures as well as realistic demands, power, and cost values, we show that already a simple monitoring of the lightpath utilization in order to deactivate empty line cards (FUFL) brings substantial benefits. The most significant savings, however, are achieved by rerouting traffic in the IP layer (DUFL), which allows emptying and deactivating lightpaths together with the corresponding line cards. A sophisticated reoptimization of the virtual topologies and the routing in the optical domain for every demand scenario (DUDL) yields nearly no additional profits in the considered networks. View full abstract»

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  • Energy-efficiency in telecommunications networks: Link-by-link versus end-to-end grooming

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1293 KB) |  | HTML iconHTML  

    The large share of energy consumption in telecommunication networks is expected to shift from access networks to core networks. Estimating the power consumption of core networks is not easy, as they vary a lot in size and topology. Using an exemplary but realistic core network, we estimate its power consumption for both a link-by-link grooming and an optical end-to-end grooming scenario. We show that optical end-to-end grooming consumes about half the power of the alternative scenario. View full abstract»

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  • A practical approach to scheduler implementation for optical Burst/Packet Switching

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (218 KB) |  | HTML iconHTML  

    Optical Burst and Packet Switching represent two key paradigms to build bandwidth-efficient IP over DWDM networks. Due to very strict time constraints, one of the major implementation issues common to both technologies is the actual feasibility of the scheduler that is in charge of assigning transmission resources to burst/packets upon request while executing optimized algorithms for contention resolution. This paper demonstrates how a specific formulation of the scheduling problem can be the basis for a cost-effective and practical implementation of the scheduler control logic, resulting in processing times that are greatly reduced and could show very limited dependence on the traffic conditions. View full abstract»

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  • On M-concurrency path computation and its application in dynamic service Multi-Layer Networks

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (321 KB) |  | HTML iconHTML  

    Dynamic path computation and optimization is very challenging for emerging Multi-Layer Networks (MLN), typically Packet Optical Transport Networks (P-OTN). In this work, we propose to address a category of dynamic optimization problems in MLNs by using an M-concurrency path computation approach. By leveraging our previous work in single path computation solutions for MLNs, we design an efficient M-concurrency path computation heuristic to optimize dynamic service provisioning. Based on this base solution, we develop optimization schemes to address two realistic application problems: (1) dynamic optimization for service reprovisioning and (2) dynamic optimization for mixed scheduling and immediate requests. Experimental results are presented for performance evaluation and comparison of the investigated optimization solutions and schemes. View full abstract»

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  • Cooperation among multiple virtual topologies based on attractor superimposition

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (6298 KB) |  | HTML iconHTML  

    In this paper, we propose a cooperation mechanism among multiple virtual topologies in wavelength-routed optical networks. It is based on attractor selection and superimposition, which models the biological systems that behave cooperatively and symbiotically only by sharing a small amount of information with each other. While our proposed method allows each virtual topology to be controlled in a distributed manner, it achieves the cooperation among those virtual topologies with sharing the activity, which indicates the condition of each virtual topology. Through simulations, we demonstrate that our proposed method coordinates all virtual topologies appropriately only by sharing the activity. View full abstract»

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  • Traffic grooming and regenerator placement in impairment-aware optical WDM networks

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1593 KB) |  | HTML iconHTML  

    In this paper, we address the problem of traffic grooming and regenerator placement in a WDM optical network in which lightpaths are hop-constrained by physical impairments. The efficient placement of regenerators and electronic grooming equipment at ROADM nodes for a given network topology is required such that all traffic demands can be supported with minimum cost. We present a detailed ROADM node architecture together with an associated cost model, and we propose an auxiliary-graph-based heuristic for jointly placing regenerators and electronic grooming equipment in the network. The numerical results show that combining the grooming problem with the placement of regenerators reduces the network cost significantly compared to the cases in which traffic grooming and regenerator placement are handled separately. View full abstract»

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  • Cross Optimization for RWA and regenerator placement in translucent WDM networks

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (159 KB) |  | HTML iconHTML  

    Translucency in WDM networks appears as a trade-off between the low cost of full transparency and the high signal quality provided by full opacity. On the one hand, transparent networks undergo various transmission impairments due to optical components deployed in the network. On the other hand, opaque networks remain very expensive due to electrical 3R regeneration (Re-amplifying, Re-shaping, and Re-timing), performed at each network node. Translucent networks use sparse regeneration strategy in order to improve the optical signal budget. In translucent network design, the objective is to judiciously choose the regeneration sites in order to establish a set of traffic demands with an admissible quality of transmission at a minimized network cost. We address the problem of translucent network design by proposing a novel heuristic for routing, wavelength assignment and regenerator placement. Our heuristic, called COR2P for Cross Optimization for RWA and Regenerator Placement, aims at minimizing both the number of required regenerators and the number of regeneration sites in the network. The originality of COR2P lies on a CapEx/OpEx perspective for network cost evaluation. Capital Expenditure refers to the network deployment cost while Operational Expenditure refers to the network management and maintenance cost. We introduce an original cost function that contributes to the optimization of CapEx/OpEx expenditures. In this paper, we investigate the impact of different parameters introduced in our heuristic and cost function, such as the ratio of sites chosen a priori for regeneration, and the limited size of regenerator pools installed at such nodes. Our simulation results outline that a tradeoff for CapEx and OpEx costs can be achieved by judiciously adjusting these parameters. View full abstract»

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  • Fast and flexible optical path accommodation design based on Pre-planning and Reconfiguration in transparent optical mesh networks

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (413 KB) |  | HTML iconHTML  

    This paper proposes the Pre-planning and Reconfiguration of Wavelength (PRW) scheme which achieves a fast and flexible optical path accommodation design that deals with sequential traffic demand and addresses the Routing and Wavelength Assignment (RWA) problem. The proposed scheme comprises four key steps. First, in the pre-planning stage, Integer Linear Programming (ILP) is used to design routes and wavelengths according to the prediction for all traffic demand before requesting to establish an optical path. Second, the designed routes and wavelengths for each source and destination node pair are defined as the Wavelength-grouped Transmission Guaranteed Link (¿TGLs), and the resources necessary to establish an optical path in all the ¿TGLs are secured in the network operation stage. Third, in the network operation stage, the optical path is accommodated using the above secured route and wavelength. Fourth, when the traffic demand prediction is different from the actual traffic demand, routes and wavelengths are reconfigured according to the updated traffic demand prediction. This is done without interrupting the existing optical paths while minimizing any increase in the number of fibers when the ¿TGLs are modified. The PRW scheme achieves fast provisioning and flexibility in dealing with changes in the traffic demand prediction. This paper assesses the cost-effectiveness of the PRW scheme compared to the conventional post-planning scheme, which dynamically assigns a route and wavelength set to each optical path setup request. View full abstract»

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  • Network migration cost study

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (355 KB) |  | HTML iconHTML  

    In this paper a cost analysis case study of migrating services from an SDH network platform into a packet based transport network is presented. The Net Present Value (NPV) of the costs of actively migrating the services is compared with the NPV of the costs of operating the SDH platform for the regular duration of all remaining services. Different cost contributors, including Capital Expenditures and Operational Expenditures, as well as different traffic scenarios are analyzed based on a realistic scenario. Different migration strategies are considered. In most cases active service migration is cost efficient. It can be shown that cost savings can be optimized if the traffic scenario, the migration time window and the migration speed are aligned. View full abstract»

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  • 10Gbps-Class, bandwidth-symmetric, OCDM-PON system using hybrid multi-port and SSFBG en/decoder

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (9598 KB) |  | HTML iconHTML  

    A next generation access network becomes necessary to upgrade the systems, providing a larger dedicated bandwidth to each user. Optical code division multiple access (OCDMA) is one promising candidate for new-generation broadband multiple access technique with unique features of full asynchronous transmission, low latency access, soft capacity on demand as well as optical layer security. Recently, a cost-effective OCDMA system using a single multi-port en/decoder at an optical line terminal (OLT) and superstructured fiber Bragg grating (SSFBG) encoder/decoders at each optical network unit (ONU) in an optical network has been proposed and demonstrated. In this paper, we report our proposed 10 Gbps-class, bandwidth-symmetric, OCDM-PON system, which includes a system configuration and the characteristics of multi-port and SSFBG encoder/decoder. Moreover, we describe the demonstration of 8×8 full-duplex, asynchronous, 10 Gbps, DPSK-OCDMA system over 50 km transmission. View full abstract»

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  • Evaluation on 10/1 Gb/s asymmetric EPON with active filtering remote node design and modelling

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    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (6003 KB) |  | HTML iconHTML  

    In this paper, we design and evaluate through modelling a solution for 10/1 Gb/s asymmetric EPON upgrade using simple active remote node that is capable of supporting layer two filtering scheme. The remote node learns information on connected ONUs and filters unwanted frames to keep the ONUs' transceiver ports at 1 Gb/s while upgrading only the feeder link between OLT and RNs to 10 Gb/s to reduce the initial capital expenditure of deploying 10 G-EPON system. Using numerical modelling, we analyse an EPON system consisting of 160 ONUs implemented with a dual splits of 1:10 and 1:16. The results show that the proposed EPON with remote node upgrade solution is capable of achieving same downstream data rate compared to point-to-point full 10 Gb/s upgrade while offering significant reduction in initial upgrade cost. View full abstract»

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