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Connection based networking is a basic technology for data transmission in Transparent Optical Networks (TON). In this kind of networks, important elements of the network design and management are related to the routing decisions in the optical level. To diminish the use of resources, multicasting is required for a lot of applications. Usually, multicast routes are light-trees in TONs. These trees...
The continued increase in Internet traffic, particularly in metro networks, is spurring wide deployment of optical networking technologies for wavelength routing. In metro networks, the number of nodes traversed can be very large and hence the optical filtering penalty incurred in the ROADM/OXC nodes can be critical as it degrades fiber frequency utilization. This presentation elucidates how grouped...
In this work, we investigate overlapping shared segment protection under continuous and TDM-mode sliding scheduled traffic model and compare its performance with that of shared path protection under sliding scheduled traffic model in Store-and-Transfer WDM Networks. Simulations show the following: Under continuous sliding scheduled traffic model, shared segment protection has 12% lower blocking rate...
Inter-datacenter networks need to support datacenter communication with the end-users, as well as content replication and synchronization between datacenters in a reliable manner. This paper presents a survivable manycast, anycast and replica placement strategy for optical inter-datacenter networks resulting in reduced overall network resource consumption.
Due to the variability of network topologies and services that can be deployed in the transport network, traffic engineering decisions within a software defined networking (SDN) controller need to be influenced by the current network topology, available resources, and end user experience. In this work a holistically approached traffic engineering quality of experience (QoE) feedback application is...
Multi-path allocation has been proposed as a simple way to achieve traffic protection in different networking domains. In this work dual-path allocation is proposed for Elastic Optical Networks (EON) assuming dynamic offered traffic, and its performance is quantified by simulation. Indeed, dual-path allocation is compared with partial dedicated path protection assuming different scenarios. In addition...
In this paper, we focus on efficient column generation (CG)-based method for routing and spectrum allocation (RSA) of anycast traffic in survivable elastic optical networks (EONs). The studied anycast traffic is modelled as a two-directional transmission (from the client node to a data center and from a data center to the client) while the network is protected against a single link failure by a dedicated...
In this paper a new RMLSA (Routing, Modulation Level, and Spectrum Assignment) algorithm is presented. The proposal leverages on the potential usage of intermediate modulation format conversion to increase the optical reach or being able to use route segments with lower available capacity.
Segment Routing (SR) has been recently introduced to enable efficient traffic engineering while simplifying control plane operations. Thanks to the source routing paradigm, traffic flows can be dynamically routed along the network, effectively exploiting network resources. In this paper, dynamic SR operations for multi-layer networking are presented and experimentally demonstrated. In particular,...
Estimating the Quality of Transmission (QoT) of lightpaths is crucial for reducing provisioned margins, making optimized dynamic decisions, and localizing failures. We leverage a QoT estimation tool that uses feedback from the network in order to provide accurate QoT estimations. We propose a scheme to establish active monitoring lightpaths (i.e., probe lightpaths used only for monitoring purposes)...
To support emerging traffic demands, metro optical networks evolve over time with the addition of new links to relieve network bottlenecks and congestion. These new resources need to be optimally located in the network, in order to minimize the cost of the new deployment. Spectrum-fragmentation and network-wide load imbalance impede the optimal allocation of network resources. With the recent convergence...
This paper evaluates the performance of the first-last-exact fit spectrum allocation policy for elastic optical networks. The first-last-exact fit spectrum allocation policy is intended to increase the number of aligned available slots and avoid small contiguous available slots, and hence suppresses the blocking probability. This policy separates the allocation of disjoint and non-disjoint connections...
This paper evaluates the performances of elastic optical networks (EONs) in terms of request blocking probability with and without incorporation of spectrum conversions at intermediate switches. In EONs, dynamically setting up and tearing down of lightpath connections generate spectrum fragmentation problems. The spectrum fragmentation problem occurs when the available spectrum slots are isolated...
The utilization of time-synchronized operations (TSO) is gaining interest in the research community on Software-Defined Networking (SDN). This paper discusses TSO applicability in electronic packet and optical networks. In electronic packet networks, the TSO approach has been shown to improve network performance, thanks to timed network updates. In optical networks, this approach enables novel security...
The network with massive storage at the switching nodes can store and forward bulk data from delay-insensitive applications. Increasing storage capacity can, under some circumstances, improve network throughput, like bandwidth does. In this paper, the effects of storage and bandwidth on OCS network performance and the principles of trading storage for bandwidth are discussed. Our research indicates...
Space division multiplexing (SDM) seems to be a promising solution with the scaling potential to overcome the possible capacity crunch problem in optical backbone networks. The main goal of this paper is to provide a detailed analysis of three SDM scenarios, namely, SDM-Fixed, SDM-Single, and SDM-Flexible in terms of the spectrum usage and the wastage of spectral resources due to guardbands and resource...
In this paper we introduce the SDNRoute system which aims to support routing decisions in Software Defined Networks. Such a system is especially important in the context of the SDN as this concept makes it possible to perform routing in a dynamic and elastic manner. We focus on the SDNRoute architecture and research challenges that must be investigated to develop the system. Additionally, we provide...
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