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In this paper, we study the problem of survivable virtual optical network (VON) mapping against single link failure with shared backup path protection (SBPP) in elastic optical networks. We formulate this problem with an integer linear programming (ILP) model to minimize the resource consumption of both working and backup paths. A different dynamic cost model (DDCM) for each sharable frequency slot...
This paper introduces a novel Routing, Core and Spectrum Assignment (RCSA) algorithm based on the Connected Component Labelling (CCL) algorithm. The RCSA algorithm represents the spectrum of multicore fibers as matrices and the CCL algorithm discovers with low computational complexity the available spectrum to allocate to a connection request. Spectrum fitting policies are also proposed to be jointly...
It is known that by incorporating network function virtualization (NFV) in inter-datacenter (inter-DC) networks, we can use the network resources more intelligently to deploy new services faster. This paper considers an inter-DC elastic optical network (IDC-EON) and studies how to orchestrate the multicast-oriented NFV trees (M-NFV-Ts) in it efficiently. We first consider an offline scenario in which...
Network virtualization is enabling infrastructure providers (InPs) to offer new services to higher level service providers (SPs). InPs are usually bound by Service Level Agreements (SLAs) to ensure various levels of resource availability for different SPs' virtual networks (VNs). They provision redundant backup resources while embedding an SP's VN request to conform to the SLAs during physical failures...
Traditional fronthaul (FH) solutions are not efficient and scalable enough to enable large-scale Cloud RAN deployment and to support 5G evolutions. In this paper we proposed a new fronthaul interface call Next Generation Fronthaul Interface (NGFI). The design principles of the NGFI are described including decoupling the FH bandwidth from the number of antennae, decoupling cell and user equipment processing...
Network virtualization has become an important feature for cloud-based services. Virtual networks can be set up over high-capacity optical networks. They consist of virtual links and nodes, which are mapped over physical resources. Operational virtual networks get gradually upgraded to avoid capacity exhaustion and create resources to handle traffic growth. These upgrades require leasing of new virtual...
It is generally believed that wireless communication is not suitable for certain critical applications of smart grid in terms of latency and reliability. In this paper, it is intended to illustrate, through analysis, that this statement is not generally true and the ultimate appropriateness of wireless communication is dependent on specific design parameters of the communication system for the application...
We proposed to mitigate the effect of modal dispersion by reducing the effective NA of the fiber link. A simple spatial mode filtering technique has been experimentally demonstrated to improve the performance over a 30 m link, achieving a BER of 10−8 at 1 Gbps. This approach offers a simple and a cost-effective solution to deliver Gigabit Ethernet using NRZ signaling over short reach POF networks...
Massive fiber-to-the-home network deployment is creating a challenge for telecommunications network operators: exponential increase of the power consumption at the central offices and a never ending quest for equipment upgrades operating at higher bandwidth. In this paper, we report on flexible signal slicing technique, which allows transmission of high-bandwidth signals via low bandwidth electrical...
The recently proposed concept of Elastic Optical Networks (EON) is expected to largely improve optical network resource utilization due to the possibility to divide the optical spectrum into relatively narrow segments called slices. In turn, the increasing position of numerous IT solutions in the modern world as well as the growth of network traffic trigger the need to develop robust and cost-efficient...
In the current era of big data, applications increasingly rely on powerful computing infrastructure residing in large data centers (DCs), often adopting cloud computing technology. Clearly, this necessitates efficient and resilient networking infrastructure to connect the users of these applications with the data centers hosting them. In this paper, we focus on backbone network infrastructure on large...
Disasters hit telecommunication structures every year. As Earth becomes more disaster-prone, telecom networks, and especially optical networks due to their high capacity, should be designed to prepare against disasters. Although disaster resiliency for optical core networks has been subject of significant recent research, damages on the network infrastructure due to the direct or indirect impacts...
We demonstrate a continuous range of complementary (+/−) weights in a bank of silicon microrings. Continuously configurable weighted addition is a key function for multivariate analog signal processing and could enable scalable analog networking approaches in silicon photonics.
We discuss survivability considerations for multi-carrier-based elastic optical networks, focusing on the multi-carrier transponder (MCT). We explain the necessity of subcarrier restoration that can recover multi-carrier connections using backup sub-channels. An initial evaluation shows our restoration scheme improves transponder reliability.
Many-to-many (m2m) networking is a communication paradigm for provisioning numerous types of network services. In this paradigm, a group of hosts exchange information between its members in a synchronous way. We focus on two impairment aware dynamic routing approaches for m2m communication: direct full mesh connectivity and replicated transmission using rendezvous servers. Furthermore, in the latter...
We investigate Elastic Optical Networks under fiber failures. In the low Link Margin regime, up to 43% of affected demands are accommodated in existing higher QAM lightpaths.
We combine adaptive coding with nonlinear impairment-aware routing and spectrum allocation problem in elastic optical networks. An integer linear program formulation and low-complexity heuristics are proposed. Results indicate that over 50% bandwidth reduction can be obtained due to code-rate optimization.
Next generation 5G mobile system will support the vision of connecting all devices that benefit from a connection. Transport networks need to support the required capacity, latency and flexibility. This paper outlines how 5G transport networks will address these requirements.
Adaptation techniques in Elastic Optical Networks (EONs) are first discussed, highlighting the need for automatic configuration procedures. Then, a novel software defined technique for effective self-adaptation of carrier spacing is proposed and demonstrated in a field trial.
Elastic networks are agreed as the right solution to improve optical networks performance. This work discusses about flexible grid usage value, supported by extensive simulations. Elastic connections using fixed grid spectrum allocation can actually lead to better network performance.
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