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We present an energy-efficient on-chip reconfigurable computing architecture, the so-called OLUT, which is an optical core implementation of a lookup table. It offers significant improvement with respect to optical directed logic architectures, through allowing the use of wavelength division multiplexing (WDM) for computation parallelism. We performed a design space exploration that elucidates the...
Requirement for high bandwidth internet traffic is growing rapidly now-a-days. Utilization of the available resources becomes troublesome due to rise in the number of users. So it is important to provide the resources efficiently. To solve the problem of resource provisioning, many developments have been made by the researchers. During working hours, the scheduled traffic is huge and sluggish during...
We demonstrate a four-port optical switch for the photonic network-on-chip architecture, which contains four silicon Mach-Zehnder optical switch elements tuned by the plasma dispersion effect. The optical signal-to-noise ratio of the device is over 10.0 dB in the wavelength range from 1525 nm to 1565 nm. Its 10%–90% rise time and fall time are 2 ns.
Accommodating sustained exponential traffic growth in optical networks requires scaling the spatial dimension using space-division multiplexing. Numerous uncoupled spatial channels may be realized by activating multiple parallel fibers or cores in multicore fibers. A multiplicity of uncoupled spatial channels will render the granularity provided by multiple wavelength channels less essential in enabling...
Optical wavelength-routed networks enable parallel transmission of massive datasets on non-overlapping wavelength channels. However, as the sizes of scientific workflows increase, the simple availability of multi-wavelength resources will fall short of supporting application needs. Rather, these resources must be allocated intelligently, efficiently, and flexibly to bear the burden of high-volume...
The adoption of a flexible dense wavelength division multiplexed (DWDM) grid in optical transport networks will materialize the envisioned opportunity to capitalize from a more efficient spectrum allocation. Particularly, routing media channels comprising multiple adjacent carriers enables to pack them closer together and use a single pair of guard bands of adaptive size to accommodate filtering impairments...
Multi-link failures in the Internet may incur heavy packet loss and degrade the network performance. Existing approaches have been proposed to address this issue by enabling routing protections. However, the effectiveness and efficiency issues of these approaches are not well addressed. In particular, it has not been answered that whether label-free routing can provide full protection against arbitrary...
Traffic variation heavily impacts energy savings achieved by putting Line Cards (LCs) into Sleep Mode (SM) in core Internet Protocol (IP)-over-Wavelength Division Multiplexing (WDM) networks. We propose a simple traffic model covering temporal and spatial traffic variation and investigate the impact of (controlled) traffic variations on energy savings achieved with the Energy Watermark Algorithm (EWA)...
While the Routing and Wavelength Assignment (RWA) has been widely studied, few studies attempt to solve realistic size instances, namely, with 150 wavelengths per fiber and a few hundred nodes. Indeed, state of the art is closer to around 20 nodes and 30 wavelengths, regardless of what the authors consider, heuristics or exact methods with very few exceptions. In this paper, we are interested in reducing...
The seemingly insatiable demand for mobile, video and cloud-based services shows no sign of slowing down. High bandwidth-consuming applications such as super-sized cloud storage and 4K/Ultra High Definition video services are becoming more and more popular. This causes requirements for optical networks to reach transmission of 100 Gbps and beyond. However, going beyond 100 Gbps does not come without...
Effective quality monitoring per wavelength channel is indispensable to modern high speed transparent DWDM systems. Besides linear and nonlinear degradation, the optical impairments also depend upon wavelength channel used along with the state of other channels at a given time. In this paper we have proposed a mixed integer linear programming(MILP) model for solving routing and wavelength assignment...
While lightpath rearrangement has already been investigated by several authors for the dynamic RWA problem, we propose to revisit it with the goal of evaluating the minimum number of lightpath rearrangement it requires in order to remain with an optimized RWA provisioning, using ε-optimal solutions. Lightpath rearrangement is now made feasible with the use of colorless, directionless, and contentionless...
The chapter presents a comprehensive discussion on the benefits of a hybrid optical WDM network solution while introducing the concept of waveband switching for port cost reduction. The chapter provides a detailed overview of different waveband routing and assignment algorithms that exploits the logical hierarchy in terms of wavebands and wavelengths. Cost effectiveness of the hybrid solution is also...
In this paper, we propose and analyze a new defragmentation strategy for elastic optical networks (EON). Such strategy is based on the cyclical identification of the most fragmented optical link followed by later reallocation of the lighpaths that share it. Our computer simulation results indicate that the considered scheme offers a blocking probability reduction of up to 48% in comparison to the...
In this paper, the new problem of routing and spectrum resources assignment in multi-band optical orthogonal-frequency-division-multiplexing (MB-OFDM) metropolitan (metro) networks is analysed. Differently from the routing and spectrum assignment problem in elastic optical networks, in order to serve a connection request, routing, wavelength and band assignment (RWBA) is needed in MB-OFDM networks...
This work proposes a new Integer Linear Programming (ILP) formulation for traffic grooming, routing and spectrum allocation (GRSA) to be used in translucent elastic networks. In order to compare our method with classic routing and spectrum allocation (RSA), it was presented an ILP model for RSA problem, allowing the evaluation of the benefits of traffic grooming in translucent elastic networks. Numerical...
Compact and simple all-Optical Wavelength Converters with 2R regeneration capabilities that do not require any high speed electronics and still are able to handle bit rates up to 100 Gbit/s and beyond, are of utmost interest to make today's and future high-speed Telecommunication Systems practical. All-optical networks employing Wavelength Division Multiplexing (WDM) technique will be the backbone...
In order to provide good quality of survivability in the WDM (Wavelength Division Multiplexing) optical network and keep the network load in a good condition, a game based muti-domain protection scheme is proposed in this paper. Game theory, Nash equilibrium and Pareto Optimality of micro-economics are introduced in this scheme for considering benefits of both users and network providers to guarantee...
We present a novel configuration of bidirectionally-utilized WSSs, which enables routing of wavelengths between tributary ports. The proposed configuration enables realization of OXCs and ROADMs with fewer numbers of WSSs than would conventionally be required.
The impact of traffic asymmetry on performance of Elastic Optical Networks (EONs) is studied. Results of experiments are presented to show how both symmetric and asymmetric lightpath provisioning scenarios influence spectrum usage and network CAPEX cost.
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