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Grids can efficiently deal with challenging computational and data processing tasks which cutting edge science is generating today. So-called e-Science grids cope with these complex task by deploying geographically distributed server infrastructure, interconnected by high speed networks. The latter benefit from optical technology, offering low latencies and high bandwidths, thus giving rise to so-called...
We propose a p-cycle expanded protection scheme that can guarantee 100% node protection, in addition to 100\% protection against single link failures. While some previous studies had already noted that p-cycles can naturally offer some node protection, we show that, at the expense of some p-cycle overlapping, with very mild impact on the bandwidth efficiency, one can guarantee node protection. We...
Reducing the Internet power consumption will become a challenging issue, since the Internet is expected to face a high growth in terms of traffic requirements. Simply scaling the network architecture, thus increasing its energy consumption, proportionally to this growth would not be a practical solution. Various energy-efficient approaches have been considered, typically consisting in a dual-layer...
In multi-domain optical networks, due to confidentiality and management considerations, it may be infeasible to broadcast complete domain state information among domains. Nevertheless, sufficient information on each domain is required in order to keep network activities operating successfully. Topology Aggregation (TA) may be adopted to abstract a domain's detailed topology into an aggregated topology...
In this paper, we address the problem of survivable traffic grooming and regenerator placement in optical WDM networks with impairment constraints. The working connections are protected end to end by provisioning bandwidth along a sequence of lightpaths through a dedicated connection-level protection scheme. An auxiliary-graph-based approach is proposed to address the placement of regenerators and...
Recently, the OFDM-based Spectrum-sliced Elastic Optical Path (SLICE) network attracts significant interests due to its elastic band-width allocation. The OFDM technology, on one hand, enables both sub-wavelength and super-wavelength traffic accommodation by allocating appropriate number of sub-carriers. On the other hand, it can provide high signal quality by overcoming various impairments. In SLICE...
Waveband networks allow multiple lightpaths to be aggregated and routed as wavebands, resulting in fewer switch ports. In an impairment-aware waveband network, a lightpath needs to be electronically regenerated before its signal to noise ratio reaches an unacceptable level. However, when a lightpath in a waveband needs to be regenerated the entire waveband needs to be demultiplexed into wavelengths...
In this paper, we study the problem of multicast flow aggregation with the objective of minimizing the total number of trees. Each established tree can choose a line rate from multiple available line rates. The destinations of each tree are guaranteed to receive data correctly from the source through the chosen line rate. We first use two auxiliary graphs to describe the problem and show that the...
Bulk data transfers, which require reliable and efficient transfer of terabits or even petabits of data for data-intensive applications, have been extensively studied. In these applications, usually, a specified amount of data needs to be transferred within strict deadline. Previous researches mainly focus on routing deadline-constrained bulk data transfers to improve the utilization of network resources...
Since the early 2000s, a real attention is paid to physical impairments arising in large-scale optical networks. One cost-effective solution to cope with transmission impairments is to deploy 3R (re-amplifying, re-shaping, and re-timing) regenerators in a limited number of network nodes (i.e., translucent networks). Taking into account the simultaneous effect of four transmission impairments (amplified...
The increasing traffic demand resulting from the widespread use of information and communication technologies is impelling network operators to upgrade the capacity of their existing transport network facilities. Recent advances in the scientific community have led to the first developments in serial 100 Gb/s technology that could provide an adequate solution for solving the capacity expansion problem...
Transparent all-optical networks introduce a challenging problem of achieving efficient and accurate full-coverage fault-localization. In this paper we present a novel and efficient monitoring approach that exploits the benefits of provisioned user lightpaths for in-band monitoring and achieves complete fault localization coverage at the minimum resource cost through the use of complementary supervisory...
An application-cooperative bandwidth on-demand (BoD) network with dynamic adaptive reconfiguration for Gbps-class HDTV transmission applications is presented. For high-bandwidth data transmission, such as HDTV streaming and Tera-byte-class file transfer, the strong application-network cooperation is one of the key components for facilitating stable and high-performance transmission. The BoD network...
The long-reach passive optical network (LR-PON) is receiving significant research attention due to its potential in delivering future bandwidth intensive services to a significantly higher number of customers at a lower unit cost of bandwidth. Carrying substantially higher traffic over increased distances as compared to conventional PONs, the survivability of these networks is a key feature that must...
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