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For interconnection between geographically-separated data centers, network carriers typically implement multiple optical paths in a wide-area network. For example, when transmission wavelengths have 100 Gb/s granularity, three 100 Gb/s wavelength paths are provisioned to satisfy a customer demand of 300 Gb/s. Over the multiple provisioned paths, interconnection traffic is typically distributed using...
The Lower Colorado River Authority (LCRA) is a public utility that operates in central Texas to manage the water supply in the Lower Colorado River basin and both generates and supplies electric power. LCRA Transmission Services Corporation (TSC) owns and operates more than 4,800 miles of transmission lines and 330 substations. IP/MPLS (Internet Protocol/Multi-protocol Label Switching) utilized primarily...
The concept of hybrid polymer optical fibre (POF) and visible light communication (VLC) for in-home networking is experimentally evaluated in this paper. The performance evaluation is based on two schemes of discrete multitone (DMT) and multilevel pulse amplitude modulation (PAM) techniques. The combined effects of modal dispersion of the POF and the limited bandwidth of the phosphor converted illumination...
With the fast development of various applications, the demand for network bandwidth has been increasing significantly during the past decade. Although the WDM (wavelength-division multiplexing) technology has already provided high bandwidth using parallel wavelength channels, the overall network spectrum efficiency is however severely discounted by the fixed grid definition and standard rate transmission...
Two Vertical Cavity Surface Emitting Laser (VCSEL) diode structures based on InGaAs-GaAs and GaAs-AlGaAs are considered for thermal analysis and their impact on 850 nm digital optical link are investigated. The effect of Multi Mode Fiber (MMF) link length and VCSEL temperature on the overall link performance is compared for both the cases under 1.25 Gb/s transmissions. Bit Error Rate (BER) of 2.02...
The advances in fiber-optic technology and wavelength division multiplexing technique have led to the adoption of optical networks into cloud data centers to meet the ever-growing traffic demands. The hybrid optical-electrical data center network architecture becomes a transition solution from the all-electrical network architecture to the all-optical one since it is efficient in terms of the operational...
The rapid growth in world-wide communications and the rapid adoption of the Internet has significantly modified our way of life. The traffic behavior is changing rapidly and the increasing mobility of traffic sources makes grooming more complex. To fulfill the needs of the future Internet, optical transmission and networking technologies are moving toward to the goals of greater efficiency, flexibility,...
Involving optical networking in the data center network (DCN) architecture is an emerging trend. Optical networking with advantages of high capacity and cost efficiency, would improve the network throughput for the cloud platform and improve the performance for serving big data applications. How to realize the network-aware resource provisioning for the big data applications in the optical DCN architecture...
Extreme-scale science applications are highly innovative and constantly evolving. They are expected to generate data in the petabyte and exabyte ranges. This data needs to be transferred, processed, and analyzed at remote locations. A flexible data retrieval service is needed, where a user requesting data retrieval from a remote site can have a choice between replicated storage sites. Elastic Optical...
The SLICE architecture for a 6-node network with its components is analyzed. Balanced load spectrum allocation and shortest path with maximum reuse are simulated to address the routing and spectrum allocation. The algorithms results show the reduction in sub-carrier utilization in a SLICE optical network. The simulation results also gives us the maximum subcarriers utilized in each case for various...
Wavelength division multiplexing (WDM) divides the huge bandwidth available on a fiber into several non-overlapping wavelength channels and enables data transmission over these channels simultaneously. Failure of the optical fiber causes loss of huge amount of data which can interrupt communication. There are several approaches to ensure network survivability. In survivability, we consider dedicated...
Degraded provisioning provides an effective solution to flexibly allocate resources in various dimensions to reduce blocking for differentiated demands when network congestion occurs. In this work, we investigate the novel problem of online degraded provisioning in service-differentiated multi-layer networks with optical elasticity. Quality of Service (QoS) is assured by service-holding-time prolongation...
Software-defined elastic optical networks (SD-EONs) provide operators more flexibility to customize their optical infrastructure dynamically and adaptively, and network virtualization, i.e., infrastructure-as-a-service (IaaS), enables multiple tenants to share the substrate infrastructure efficiently. In this paper, we study how to provision virtual SD-EONs (vSD-EONs) with the correlated data and...
Visible light communications (VLC) technology has recently emerged as a complementary technology to the indoor radio frequency (RF) networks. While the backhauling of the indoor RF networks has been supported by fiber optics, the backhauling of the VLC network is still an open research problem. Power line communications (PLC) has been considered as a possible solution for the VLC networks due to its...
In order to find out the tradeoff between recovery time and resource overhead when a link failure occurs, we propose a software-defined based fast restoration scheme for elastic optical datacenter networks, called precomputation based restoration path (P-RP). By extending the controller functionality and OpenFlow protocol in software defined networking (SDN) technology, we establish a novel elastic...
In recent years, elastic optical networks have emerged as a solution for dealing with the diversity of the bandwidth demands of network applications. The use of only two multiplexing dimensions has limited the network capacity. To ameliorate this problem, a third dimension has been added in space division multiplexing(SDM). As transmission rates increase so does the need for protection against network...
Cloud data centers have become an attractive candidate for large-scale applications that require cloud resources in the form of a virtual network. Embedding virtual networks in data centers to allocate cloud resources to the applications running on the virtual machines is crucial since it affects resource efficiency and thus the revenue of cloud providers. Most of the existing embedding algorithms...
Flexible spectrum ROADMs facilitate networks to support channels operating at heterogeneous line rates by allocating spectral resources in a dynamic and flexible manner leading to better Spectral Efficiency. In a realistic network, traffic scenario is very dynamic in nature leading to continuous tear down of existing demands and set up of new demands. This dynamic tear down and set up process leads...
We investigate the problem of dynamically routing and spectrum assignment for advance reservation anycast requests using a novel algorithm called Delayed Spectrum Allocation (DSA). We evaluate the flexible window STSD (Demands that specify start-time and duration) to further improve request blocking. Through extensive simulation results we show that anycast with flexible STSD using DSA approach can...
We describe a reach-adaptive auxiliary graph based dynamic connection grooming scheme for elastic optical networks using multiple transmission options available with bandwidth variable transponders. We study different job scheduling methods and their impact on energy efficiency. The proposed scheme also incorporates efficient regenerator usage to improve the energy efficiency.
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