This paper reports the work on next generation transponders for optical networks carried out within last years.A general architecture supporting super-channels (i.e., connection composed of several adjacent sub-carriers) and slice-ability sub-carriers grouped in a number independent with different destinations) is presented.Several transponder implementations transmission techniques are considered, highlighting advantages, economics complexity.Discussions include electronics, components,...

Metro and carrier-grade Ethernet networks, as well industrial area networks specific local (LANs), have to guarantee fast resiliency upon network failure. However, the current OpenFlow architecture, originally designed for LANs, does not include effective mechanisms resiliency. In this paper, architecture is enhanced support segment protection in Ethernet-based networks. Novel been specifically introduced maintain working backup flows at different priorities resource utilization when failed...

In flexi-grid optical networks, fragmentation of spectrum resources may significantly affect the overall network efficiency. Effective techniques for defragmentation (i.e., re-optimization) are then required to limit wasting resources. However, current can only be implemented thanks presence additional resources, such as spare expensive transponders. this study, we propose, discuss and evaluate a novel technique called push-pull. The is based on dynamic lightpath frequency retuning upon...

Optical connections support virtual links in MPLS-over-optical multilayer networks and therefore, errors the optical layer impact on quality of services deployed such networks. Monitoring performance physical allows verifying proper operation connections, as well detecting bit error rate (BER) degradations anticipating connection disruption. In addition, failure identification facilitates localizing cause by providing a short list potential failed elements enables self-decision making to...

Photonic solutions are today a mature industrial reality concerning high speed, throughput data communication and switching infrastructures. It is still matter of investigation to what extent photonics will play role in next-generation computing architectures. In particular, due the recent outstanding achievements artificial neural networks, there big interest trying improve their speed energy efficiency by exploiting photonic-based hardware instead electronic-based hardware. this work we...

Quality of Service-enabled applications and services rely on Traffic Engineering-based (TE) Label Switched Paths (LSP) established in core networks controlled by the GMPLS control plane. Path computation process is crucial to achieve desired TE objective. Its actual effectiveness depends a number factors. Mechanisms utilized update topology information, as well latency between path resource reservation, which typically distributed, may affect efficiency. Moreover, visibility limited many...

In elastic optical networks (EONs), effective soft failure localization is of paramount importance to early detection service level agreement violations while anticipating possible hard events. So far, techniques have been proposed and deployed mainly for failures, significant work still required provide automated solutions both during commissioning testing in-operation phases. this paper, we focus on in EONs by proposing two active monitoring passive monitoring. The rely specifically...

Multi-band (MB) optical transmission promises to extend the lifetime of existing fibre infrastructures, which usually transmit within C-band only, with C+L-band being also used in a few high-capacity links. In this work, we propose physical-layer-aware provisioning scheme tailored for MB systems. This solution utilizes physical layer information estimate, by means generalized Gaussian noise (GGN) model, signal-to-noise ratio (GSNR). The GSNR is evaluated assuming up entire low-loss spectrum...

We propose the TelcoFog architecture as a novel, secure, highly distributed, and ultra-dense fog computing infrastructure, which can be allocated at extreme edge of wired/wireless network for telecom operator to provide multiple unified, cost-effective, new 5G services, such NFV, MEC, services third parties (e.g., smart cities, vertical industries, IoT). The distributed programmable technologies that are proposed in expected strengthen position mobile cloud markets. TelcoFog, by design, is...

Accurate real-time availability of transmission parameters at the network controller has potential to significantly improve efficiency control and management operations, particularly in case soft failures where detection localization procedures are typically affected by long monitoring time intervals usually adopted current elastic optical networks (EONs). In this paper, we report on design, implementation, experimental demonstration a telemetry service exploiting gRPC protocol enable...

The adoption of the virtualization paradigm in both computing and networking domains portends a landscape heterogeneous service capabilities resources pervasively distributed interconnected deeply integrated through 5G network infrastructure. In this ecosystem, dynamic demand can be flexibly elastically accomplished by composing services provisioned over virtualized resource Indeed, with term Virtual Functions we refer to virtual as well (e.g., routers middlebox functions provided Network...

The 5G network revolution will be enabled by deep integration of Software Defined Networking (SDN) and Network Function Virtualization (NFV) to support multi-tenancy, per-user per-application quality service experience. However, full softwarization current SDN platforms may not able sustain the complexity heterogeneity different requirements, for example, strict latency, jitter, high precision traffic advanced monitoring. For such services, SDN/NFV needs boosted only considering...

The absence of electrical regenerators in transparent WDM networks significantly contributes to reduce the overall network cost. In networks, a proper resource allocation requires that presence physical impairments routing and wavelength assignment (RWA) lightpath provisioning be taken into account. this article centralized, hybrid centralized-distributed two distributed approaches integrate information about most relevant RWA are presented assessed. Both centralized perform path computation...

This article provides an overview of current efforts in reducing energy consumption passive optical access networks. Both ITU-T and IEEE standardized PONs are considered. The solutions proposed by standardization authorities, industry, academia classified based on the layer they address architectures: physical layer, data link hybrid. Then, answers to major questions, such as where, when, how reduce PON TDM means a quantitative evaluation. Results show that consumption, ONUs must be provided...

In wavelength-switched optical networks (WSONs), quality of transmission (QoT) has to be guaranteed during lightpath provisioning. multibit-rate WSONs, this task is complicated by the coexistence connections operating at different bit-rates and modulation formats. The major issue consists in accounting for severe impairments due cross-phase (XPM) induced 10 Gb/s lightpaths on neighbor 40 or 100 lightpaths. paper, QoT modeling first reviewed 10, 40, according adopted format detection type....

Flexible optical networks, based on bandwidth-variable cross-connects (BV-OXCs) and novel flexible transponders, are expected to significantly improve the overall spectrum efficiency with respect traditional networks where fixed frequency spacing is applied. will exploit BV-OXC capability dynamically configure reserved bandwidth as a set of slots. In addition, transponders be employed transmission parameters, such bit-rate modulation format. To enable these new configuration capabilities,...

The evolution of optical technologies is driving the introduction multirate networks exploiting advanced transmission techniques and efficient switching devices. In short term, connections operating at 10 100 Gb/s will coexist in same multi-rate network infrastructure. This, however, might introduce significant issues due to detrimental inter-channels effects, which need be considered during planning or connection provisioning. long higher bit-rates (e.g., 400 Gb/s) based on complex...

Next-generation edge nodes interfacing innovative IT clusters, 5G fronthaul, and internet of things (IoT) gateways to the optical metro/core network will require advanced dynamic online quality service (QoS) per-flow traffic treatment, assuring ultra-low latency requirements. However, current software-defined networking (SDN) implementations (e.g., OpenFlow) do not support forwarding procedures based on state, profile variations, history flow statistics at node level. Currently, such...

5G mobile communications is seen as the enabler for networked society where connectivity will be available anywhere and anytime to anyone anything. The details of are subject ongoing research debate, mostly focused on understanding radio technologies that can enable vision. So far, less work has been dedicated challenges pose transport network. This paper provides a first analysis key in terms capacity, flexibility costs, example. Different use cases discussed well technology options control...

Energy-efficient optical networks are gaining momentum as environmental-friendly solutions with reduced operational costs. Energy-efficiency can be achieved by using devices in sleep mode, i.e., a low-power, inactive state which suddenly waken-up upon occurrence of triggering events. This paper advocates mode option for the (e.g., amplifiers, switches) installed protection purposes only. These put to reduce network power consumption, but they promptly waken up (if necessary) failure...

As the power dissipation of data centers challenges their scalability, architectures for interconnecting computers, or servers must simultaneously achieve high throughput at peak utilization and consumption proportional to levels. To this goal, paper proposes use an optical multiplane interconnection network, named space-wavelength (SW) switched architecture, able route switch packets between (on cards) processors within a card (or ports). SW architecture exploits space domain address...

Next generation optical networks will require high levels of flexibility both at the data and control planes, being able to fit rate, bandwidth, reach requirements different connections. Optical transmission should be support very rates (e.g., 1 Tb/s) distance adaptive while optimizing spectral efficiency (i.e., information rate transmitted over a given bandwidth). Similarly, plane capable performing effective routing spectrum assignment as well proper selection parameters modulation format)...

Recent studies about climate change are mandating a drastic reduction of green house gas (GHG) emissions. Solutions include the utilization renewable energy sources (e.g., wind, solar energy) and increased hybrid electric vehicles (EVs). In this scenario ICT can play significant role by fostering smart current transportation infrastructures (smart grid cities). This paper presents new infrastructure to enable intelligent exploitation distributed resources in order minimize EV charging times...

Optical transport networks typically deploy dynamic restoration mechanisms in order to automatically recover optical connections disrupted by network failures. Elastic (EONs), currently emerging as the next-generation technology be adopted transport, introduce new challenges for traditional generic multiprotocol label-switching (GMPLS)-based that may seriously impact achievable recovery time. At same time, software-defined networking (SDN) framework is an alternative control plane. It...