Peter Arijs

Architecture and design of optical channel protected ring networks

In this paper, different optical ring architectures are considered and the optical add/drop multiplexer (OADM) functional architecture is described. In addition, different aspects of ring network design and their impact on the network architecture are discussed.

Quantifying the benefits of selective wavelength regeneration in ultra long-haul WDM networks

Investigates the performance of transparent OXCs exploiting selective wavelength regeneration for different maximum transparency lengths. The results reveal the tradeoff between increased transparency length and reduced cost assigned to O/E/O regeneration.

Application, design, and evolution of WDM in GTS's pan-European transport network

A pan-European transport network must cope with enormous traffic inflation by introducing appropriate network solutions. WDM technology is the solution adopted by GTS, driven by capacity requirements, infrastructure availability, flexibility, and cost. The deployment of this new technology presents specific technical issues, but more important, it lays the foundation of future optical networking. We describe the motives underlying the deployment of WDM technology in the long-haul and short-haul areas of GTSs operational transport network. Next, after presenting the use of WDM as the multiservice platform for SDH and IP overlay networks as well as native WDM services, we focus on the design of SDH-over-WDM and IP-over-WDM networks. Finally, we discuss future WDM networking and management requirements to better serve the needs of a pan-European carrier such as GTS.

Planning of WDM Ring Networks

The rapid introduction of wavelength division multiplexing (WDM) technology to cope with the increased bandwidth requirements of transmission networks has intensified the need for recovery mechanisms at the optical layer. A first step towards survivable optical networking will be seen through the introduction of optical rings. This paper presents different types of optical rings (dedicated and shared protection WDM rings) and the planning issues associated with these WDM rings. In particular, we give mathematical models as well as solution methods for the ring loading and wavelength assignment problem. We compare the wavelength requirement of dedicated and shared protection rings under scenarios with different demand patterns. We also discuss the influence of the WDM equipment cost, and present a mathematical model for the optimization of hybrid networks with both dedicated and shared protection rings.

The merit of shared and dedicated protection WDM rings in a hybrid network design

We compare network designs based on stacked dedicated and shared protection WDM rings, considering different cost scenarios and traffic patterns. The results reveal the merit of combining both ring types in a hybrid network design.

Long-term planning of optical networks

We present novel methodologies (based on stochastic traffic modelling, robust and multi-period optimisation) to cope with the fast technological innovations and increasing degree of uncertainty during the long-term planning of optical networks.

Multiple Objective Heuristic for Ring Loading and Logical Wavelength Assignment in OCH-SPRings

The dimensioning process of a multi-ring network based on optical channel shared protection is discussed. This dimensioning starts with a multi-ring routing algorithm to decide on the rings traversed by a connection, followed by “Ring Loading” — and “Logical Wavelength Assignment”-algorithms applied to the individual rings. In this paper we focus on this second aspect, for which we introduce an integrated approach. The performance and applicability of this heuristic is evaluated for different objectives.

Dimensioning of Non-hierarchical Interconnected WDM Ring Networks

In this paper we consider the routing of wavelengths in an interconnected WDM ring network, based on Optical Channel Dedicated Protection Rings (OCh-DPRing). We developed an integer linear programming and an efficient heuristic solution method and compare both methods. Furthermore we present results on network cost and availability for different network and ring sizes.

Cost boundaries for economical OXCs

Based on the design of ring and mesh network architectures using in-house developed tools, rules are deduced in order to obtain economical solutions for resilient WDM networks based on the use of optical cross-connects (OXCs).