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As the distributed multi-domain DWDM optical network has been advocated to be the next generation optical network, there is a pressing need to address the inter-domain RWA (Routing and wavelength assignment) problem. Thus, we propose a set of new inter-domain RWA schemes, including a MLP (Most leisure path) routing strategy based on the Hybrid abstraction and a ID-MU (Inter-domain most used) wavelength...
While there has been many studies on the efficient design of p-cycles focusing on optimizing their spare capacity efficiency, few of them consider such a design under the wavelength continuity assumption, i.e., no wavelength converter at any node. Consequently, few authors look at the routing and wavelength assignment in the context of p-cycles, where p-cycles have to be assigned the same wavelength...
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...
Transparent optical networks based on wavelength division multiplexing (WDM) can exploit the huge capacity of optical fibers by dividing it among different wavelengths. Physical-layer attacks, such as high-powered jamming, can seriously degrade network performance and must be dealt with efficiently. Hence route lightpaths in such a way as to minimize the potential damage caused by various physical-layer...
Optical Transport Network (OTN) is a standard approach to offering transport support to a variety of existing service technologies, e.g., ESCON, HDTV, GE, etc. Multiple service technologies can be concurrently multiplexed onto one common transport network, which offers hierarchical transmission rate wrappers physically supported by Wavelength Division Multiplexing (WDM) lambda channels. Algorithms...
Optical network design problems fall in the broad category of network optimization problems. We give a short introduction on network optimization and general algorithmic techniques that can be used to solve complex and difficult network design problems. We apply these techniques to address the static Routing and Wavelength Assignment problem that is related to planning phase of a WDM optical network...
Routing and Wavelength Assignment (RWA) problem in Wavelength Division Multiplexed (WDM) optical networks assumes assigning the routes and wavelengths to be used to create the lightpaths on behalf of the connection requests. The RWA problem belongs to the class of combinatorial optimization problems. The optimal solution to the RWA problem is found to be NP-hard and thus suited to heuristic approaches...
Blocking probability has been one of the important parameters for performance analysis in the design of wavelength routed WDM networks. Existing research has proved that the way in which Routing and Wavelength Assignment (RWA) is carried out significantly affects wavelength conversion requirements, which directly affects the blocking performance. In this paper we propose two new static Wavelength...
Link-disjoint routing strategy can offer a set of reliable alternate paths when the active best path fails. However, simply employing a set of fully disjointed paths may not necessarily result in the efficient network resource utilization in some circumstances, which degrades the performance of the network system under a highly loaded traffic condition. In this study, we propose two heuristic link-disjoint...
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 a novel outer-ROADM-ring (ORR) based multi-domain routing scheme in optical WDM networks. Results show that this scheme has both high scalability and low blocking probability, while preserving inter-domain confidentiality as well.
A novel multi-domain path routing solution is proposed for improving connection reliability under multiple correlated failure events. The formulation assumes probabilistic failures and jointly incorporates traffic engineering objectives.
A Wavelength-Aware approach for Translucent design and dynamic routing is presented. Compared to the Wavelength-UnAware worst-case design scenario, up to 100% reduction on OEO interfaces has been found.
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.
Orthogonal Frequency Division Multiplexing (OFDM) has been recently proposed as a modulation technique for optical networks, due to its good spectral efficiency and impairment tolerance. Optical OFDM is much more flexible compared to traditional WDM systems, enabling elastic bandwidth transmissions. We consider the planning problem of an OFDM-based optical network where we are given a traffic matrix...
One of the main challenges in optical networking is the problem of Routing and Wavelength Assignment (RWA). Generally speaking, the algorithms proposed for RWA are divided into two categories: Centralized and Distributed. According to the scale, size and other preferences of a network, one of the above strategies can be selected for establishing lightpaths in the network. In small size networks where...
High demands in data delivery latency and communication reliability encourage the use of fault-tolerance-enhanced all-optical WDM networks. Low latency is satisfied by setting up a direct lightpath between any communication pair to enable one-shot transmission. High reliability is met by establishing multiple disjoint lightpaths from the source to the destination. In this paper, we explore the fault-tolerance...
Advance reservation of connection requests is a growing focus area and a range of solutions have been proposed. However, most efforts here have focused on scheduling algorithm design and have not addressed related implementation concerns in distributed settings. As a result, most schemes imply the use of a centralized controller, posing many scalability and reliability challenges. In order to address...
We present a multi-objective optimization approach for joint throughput optimization and traffic engineering, where the routing request of traffic arrives one-by-one. We provide an Integer Linear Program (ILP) that simultaneously i) maximizes the aggregate throughput, ii) minimizes the resource consumption, and iii) minimizes the maximum link utilization. We study the impact of optimizing the three...
This thesis studies the wavelength assignment of the WDM network of multi optical fiber with dynamic routing. The novel Relative least influence and Relative capacity loss joint algorithm (ICJ) is used in the dynamic routing 5x5 mesh network, the simulation result show that the algorithm is obviously better than the existing RLI and RCL.
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