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This paper investigates the multi-broker based network control and management paradigm for realizing scalable and cost-effective service provisioning in multi-domain software-defined optical networks. Experimental results verify the feasibility of the proposal and demonstrate ∼ 7.6× blocking reduction comparing with the conventional single-broker based solution.
In telecommunication networks resilience intuitively refers to cycles and their lengths. More specifically, considering that the shortest cycle involving each pair of nodes in the network can be disassembled into two disjoint paths, a working path and a backup path, the average of the shortest cycles involving each pair of nodes in the network can be considered as an indicative of resilience. In turn,...
The enormous data carrying capacity and speed of optical WDM networks, have made it an obvious choice for voluminous and high speed data communication. The optical signal can only propagate up to a certain distance (optical reach) retaining its characteristics. Before its quality starts to degrade below a threshold level, it needs to be re-amplified, re-shaped and re-timed using a 3R-regenerator....
Aiming at providing united control of multi-domain optical networks orchestration, we design the Federated Platform based on Open Network Operating System (ONOS). Our implementation includes adding and extending modules in ONOS to provide the global view of multi-domain networks and support cross-domain end-to-end services by communicating with the individual domain controllers through RESTCONF protocol...
We review our previously proposed topology reconstruction mechanism in the small world topology based optical data center network (DCN). We also present some recent experimental demonstration results, which verified that the topology reconstruction can reduce the number of hotspots and thus further accelerate data analysis jobs in DCN.
Other than merely a bandwidth pipe, current and future network applications will have other requirements such as maximum end-to-end latency and the type of recovery from failure. The added complexity will require a central intelligence such as a software-defined networking (SDN) orchestrator to compute and keep track of the resources allocated to such applications. In such an SDN-orchestrated network,...
We report on the upgrade of a fiber optic network for time and frequency transfer between PTB in Braunschweig and the test center of Deutsche Telekom in Bremen, Germany. The network provides 10 MHz and 1 PPS signals at remote locations intended for the supervision of the mobile telecommunication network of Deutsche Telekom. Here we present the results of the time transfer calibration of the link.
Topology reconstruction enables optical data center networks (DCNs) to adapt to dynamic traffic patterns, but may interrupt ongoing data transmissions. We propose a cross-layer mechanism to deliver traffic over multiple optical paths and adjust their TCP congestion windows coordinately. The experimental results show that it can effectively reduce the impacts on flow transmission.
Based on the small-world optical data center network architecture, we propose a topology-aw are task placement scheme. Simulation results verified that it can effectively shorten the completion time of computing tasks' data transfer.
A resource allocation scheme consisting of joint assignment of routing, wavelength and time-slot is proposed to construct different channels in software-defined optical networks secured by quantum key distribution (QKD). Security level is considered by key-updating period.
This paper proposes a cross-layer collaborative interconnecting approach for the multi-control domain SDON networks. It's able to optimize network resources and achieve the real-time response of the network state. We use this approach to handle the traffic in single control domain and multi-control domain, which optimize transmission of the large granular traffic and the small granular traffic in...
The forecasted traffic growth makes the transmission capacity in backbone optical networks a scarce resource. Enabling the use of high-spectral-efficiency modulation formats (HSE-MFs) such as DQPSK or PM-QPSK for 40 or 100 Gbps respectively is one of the suggested on-going researches. However, some lightpaths may not require the highest rate and this call for mixed-line rate (MLR) networks. In MLR...
The Abstraction and Control of Traffic Engineered Networks (ACTN) defines the requirements, use cases, and an SDN-based architecture, relying on the concepts of network and service abstraction, detaching the network and service control from the underlying data plane. The architecture encompasses Physical Network Controllers (PNCs), responsible for specific technology and administrative domains, orchestrated...
This work is focused on the characterization of the traffic allocated in Elastic Optical backbone networks when different dynamic traffic profiles are generated. Extensive simulations are done to statistically model the real-time traffic carried by this kind of networks. Well known topologies such as NSFNet and US_Backbone are considered as well as different parameters applied to the traffic generation...
This paper proposes a new networking paradigm introducing the broker-plane above the management planes of Autonomous Systems (ASes). The brokers communicate with the manager of each AS to coordinate end-to-end resource management and path provisioning across the multi-AS networks involving multiple operators. The broker plane updates the virtual network topology, manages the resource information of...
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...
The energy efficiency in telecommunication networks is gaining more relevance with the actual increasing traffic demand. In this paper, we compare the performance in terms of energy efficiency and blocking rate in elastic optical network (EON) for the NSFNET and USA topologies, by adopting three modulations formats: Binary Phase-Shift Keying (BPSK), Quadrature Phase-Shift Keying (QPSK) and Quadrature...
We review the statistical network assessment process (SNAP) and apply it to the analysis of two different network topologies. Using SNAP, we identify topological bottlenecks and we test the effectiveness of physical layer solutions in unlocking them. We show how selected introduction of spatial division multiplexing (SDM) through fiber doubling enables to achieving a 63% and 12% capacity increase...
Network operators must deal with multi-layer architectures in their production networks. Not so much time ago, network operators were delivering the IP traffic using ATM. ATM protocol was used to aggregate end-user traffic coming from DSL connections. This traffic was transported Synchronous Digital Hierarchy (SDH) as the standard transport technology for fiber-optic transmission systems in backbone...
Optical technologies play nowadays a crucial role in different network scenarios (e.g., data centres, metro and access networks), mainly due to their support for higher bandwidth and scalability in comparison to electronic-based opaque solutions. In this context, the deployment of the Software Defined Networking (SDN) paradigm over optical networks has gained interest from both industry and research...
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