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Energy-aware lightpath routing and establishment in optical backbone networks can reduce energy consumption. A heuristic method suitable for network's Planning phase, based on Swarm Intelligence and Grooming practices is proposed that reduces the energy footprint by taking advantage of asymmetric bandwidth split across multiple streams routed to the same destination through different paths. The Ant...
This paper proposes a fully-distributed GMPLS framework through the use of extended RSVP-TE both for signaling and for routing, modulation and spectrum assignment (RMSA). Our proposed solution achieves lower blocking probability and shorter signaling-latency than does the state-of-the-art GMPLS/PCE architecture.
We present a new, highly scalable analytical model of the electronic-and-optical routing and grooming process that accurately reproduces and explains recent results for the numerical optimization of transponder count in networks with quasi-static uniform and random traffic.
We demonstrate an orchestrated inter-datacenter multicast connectivity for Ethernet services. An ABNO-driven workflow is experimentally validated to provision p2mp connectivity over a multilayer Ethernet-over-Flexgrid network. Experimental validation was carried out on a distributed infrastructure connecting Telefonica, CNIT, and UPC premises.
A distributed architecture based on stateful PCE is proposed to realize end-to-end connection provisioning in multi-domain multi-vendor optical networks. We report a successful field trial of end-to-end connection establishment across three domains using commercial devices from three equipment venders.
A novel optical switching network architecture is proposed for intra-data center interconnection. We innovatively introduced the “deterministic small-world” theory into optical network design and numerically verified the good scalability and fault tolerance of our proposed architecture.
Nanophotonic is a promising solution for interconnections in future chip multiprocessors (CMPs) due to its intrinsic low-latency and low-power features. This paper proposes an integrated approach with physical level design choices to select the most suitable optical network topology, and an adhoc software strategy to improve performance and reduce energy consumption of a tiled CMP architecture. We...
Traffic grooming in WDM optical networks is a scheme for aggregating several low-speed traffic streams from users onto a high-speed lightpath. In such networks, an optical fiber carries a large number of lightpaths and each individual lightpath carries the traffic of a large number of connection requests. So the failure of a single fiber-link, even for a brief period in such networks is a serious...
OpenFlow, as an open-source protocol with prominent performance of networking virtualization and programmability, has been gradually introduced to act as a control plane technology in optical networks. However, with the increasing of the complexity of the network architecture and the service kinds, a centralized OpenFlow-based software-defined networking (SDN) control plane has a major drawback that...
A promising development in the design of datacenters is the hybrid network architecture consisting of both optical and electrical elements. In this context, the joint problem of bandwidth allocation and VM-placement, a problem that only recently received attention in all-electrical datacenter networks, poses new and different challenges not addressed yet in hybrid datacenters. In particular, we foresee...
Dynamic flexgrid optical networks are being developed to operate under highly changing traffic scenarios. Planning such optical networks is fully dependent on the traffic characteristics whereas the constant traffic evolution needs of continuous network planning actions to adapt to new scenarios. Therefore, networks need to be periodically re-planned to consider features such as survivability degree...
Optical networks are facing increased levels of heterogeneity, from types of services to the range of technologies involved. In this paper, we focus on the inter-domain heterogeneity scenario and consider the case of a set of interconnected network domains, each one using its own optical networking technology (wavelength-routing, optical burst-switching or wavelength-routed optical burst switching)...
Optical networks have been shown to be the most viable solution for inter-data-center network implementation. Furthermore, elastic optical networks incorporating virtualization technology can significantly introduce agile delivery of cloud services. In this paper, we present resilient design of an inter-data-center network over an elastic optical network backbone aiming at minimum outage probability...
A set of techniques to design the virtual topology for flexible optical networks is presented. They are based on previous algorithms proposed for fixed-grid optical networks, which are adapted and optimized to the characteristics of flexible networks. A simulation study is presented to evaluate their performance. The technique that obtains the best result is based on genetic algorithms and enhanced...
Workloads submitted to the Cloud are handled within the data centers in a distributed manner. Reducing the operational expenses is a fundamental concern for the operators which can be addressed by efficient design of the inter-data-center network. Optical networks have been reported to be the best transport media to accommodate the high capacity inter-data-center traffic. Furthermore, employment of...
Contention is the main source of information loss in buffer-less network architectures where deflection routing is a viable contention resolution scheme. In recent years, various reinforcement learning-based deflection routing algorithms have been proposed. However, performance of these algorithms has not been evaluated in larger networks that resemble the autonomous system-level topology of the Internet...
In this paper, we study the reliable resource allocation (RRA) problem of allocating virtual machines (VMs) from multiple optically interconnected data centers (DCs) with the objective of minimizing the total failure probability based on the information obtained from the optical network virtulization. We first describe the framework of resource allocation, formulate the RRA problem, and prove that...
In optical flexgrid networks, the optical spectrum can be allocated at a much finer granularity than it can be in fixed-grid WDM networks and variable spectrum widths can be assigned to the lightpaths according to the transmission rates, leading to more efficient spectrum usage. However, the dynamic establishment and tear down of lightpaths yields to the fragmentation of the spectrum with increase...
In this paper, we consider to apply a joint defrag-mentation (DF) of spectrum and computing resources in the inter-datacenter (inter-DC) networks built over elastic optical infrastructure based on the optical orthogonal frequency-division multiplexing (O-OFDM) technology. We propose joint DF algorithms that consist of a request selection strategy to select active requests for reconfiguring and an...
Coverage area of optical transport networks (OTNs) are used in several estimations such as the average link length. However, estimating the coverage area may become complex in some cases without appropriate computing tools. In this work, we present the geometrical properties of the OTNs such as the convex area and establish their correlation with the circumferential ellipse (CE) of the networks. We...
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