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The Internet explosion has drastically increased the bandwidth demand of modern telecommunication networks and as optical networks provide an opportunity for the future Internet, it is expected that Internet providers will gradually replace their infrastructures with optical networks. The Internet is a decentralized set of networks (more than 29.000) known as domains or Autonomous Systems on a well-known...
With new optical transport systems able to provide sub-wavelength granularity, the dynamic characteristics of the network are expected to strongly increase. Furthermore, such properties are highly related to the underlying physical network topology, which in turn require from the control plane important features such as scalability, dynamism and automatism. In this paper we analyze the properties...
We present an information flow formulation that bridges network coding and tree packing (routing) and that is useful even if a suboptimal tree packing mechanism is used. We provide a system interpretation of our formulation from a network operators perspective. We study the trade-off between transmission cost and the cost of coding in a multicast session over coded packet networks. Our formulation...
The ICT and network services economy has exhibited large growth rates with global IP traffic expected to reach 64 exabytes per month in 2014. In addition to operational challenges in managing this traffic load, it is widely recognized that new energy saving approaches will be critical to the ICT sector for sustaining growth. In this paper, we use the optical bypass technique - which is a novel network...
We propose an immediate re-routing (IRR) extension to RSVP-TE signaling and implement it on our IDBR test-bed. By allowing wavelength conversion during the re-routing process, the proposed scheme can significantly reduce signaling induced blocking.
Optical routing technologies will surely be the key to creating future bandwidth abundant and green networks. Considering future services and the need to create virtual fiber networks, the introduction of wavebands is a next important step.
We propose an IA-RWA algorithm called IA-KS-EDP, which evaluates multiple routing combinations considering the effects of OSNR, CD, PMD and using edge-disjoint paths to satisfy multi-line-rate traffic demands with minimum wavelengths.
A multi-layer grooming and routing method, which considers the optical layer constraints, is proposed. This method, based on a new modeling, allows significant resource saving with respect to a layer by layer approach.
Wavelength-selective spatial routing is proposed for photonic networks and demonstrated on an electro-optic microring switch. This technique yields greater path diversity in photonic networks, enabling improved overall network performance.
With ASON network scale enlarging, many ASON networks often meet trouble for fastly setuping a service and restoration even in current ring network. It would be more serious trouble in mesh network. Firstly, the two part main time factor is proposed. Then the current methods are introduced to accelerate the speed for setuping a service. The first method is to keep network topology in every node by...
For simplified network operations, demands are often routed on shortest paths, e.g., with physical length as metric. We propose a new controlled shortest path routing concept for multiperiod planned networks, formulated as optimization model. This routing concept minimizes the network costs (capital expenditures) under the constraint of using shortest path routing within the lit fiber network. Within...
The following topics are dealt with: optical Internet; nanophotonics; green ICT; solar cells; LED; wireless mesh and sensor network; and optical switching and routing.
When multicasting in optical networks is implemented within the switching control plane, it combines the efficiency of multicast trees along with the high speed and low delay of optical communications. Multicast nodes must be equipped with light splitters. Light splitters are expensive equipment. Therefore, a limited number of optical nodes will have this splitting capability. A good placement of...
Different routing schemes for multi-layer and multidomain optical networks are analyzed, and a novel routing architecture is described in the paper. Cooperation models between dual routing engine in large-scale multi-layer and multidomain optical networks are researched, and an optimal model is proposed and simulated. Then the scalability of dual routing engine architecture is validated on DRE testbed.
Dispersion due to linear chromatic and nonlinear effects of the single mode optical fibers are critical in ultra-high speed global optical Ethernet operating at 10Gb/s to 100Gb/s. This paper investigates the use of optical burst switching (OBS) to overcome the problem of blocking and contention under optical circuit switching, especially when the traffic load is heavy. The traffic transport characteristics...
Physical impairments, such as noise and signal distortions, negatively affect the quality of information transfer in optical networks. The effect of physical impairments predominantly augments with distance and bit rate of the signal to the point that it becomes detrimental to the information transfer. To reverse the effect of physical impairments, the signal needs to be regenerated at nodes that...
Congestion removing performance has been investigated in IP-over-CWDM networks with ROADMs under the best-effort transmissions specified by the service level agreement (SLA). Two approaches were tried to remove congestion, and the experimental results clarified that the approaches could remove congestion by adding a lightpath automatically or adding a static bypass route automatically. The degraded...
A compact and efficient control plane has been implemented to demonstrate multipath routing for a twenty-electrode photonic integrated circuit with round-robin scheduling. A single slot clock with 3.2 μs packet period dynamically cycles connections between all input and output ports.
We propose a novel node architecture and a design algorithm for hierarchical optical path networks that make the best use of waveband add/drop ratio limitation. Numerical results verify significant reductions in network cost and node switch scale.
Our proposed information-diffusion-based routing (IDBR) is implemented on Tsinghua University's large-scale ASON test-bed. The procedure of IDBR is validated together with RSVP-TE signaling in the experiment. Results show that the IDBR is fast converged and has low bandwidth consumption.
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