W. Van Parys

Dimensioning of survivable WDM networks

In this paper routing, planning of working capacity, rerouting, and planning of spare capacity in wavelength division multiplexing (WDM) networks are investigated. Integer linear programming (ILP) and simulated annealing (SA) are used as solution techniques. A complex cost model is presented. The spare capacity assignment is optimized with respect to three restoration strategies. The benefit of wavelength conversion, the choice of the fiber line system, and the influence of cost parameter values are discussed, with respect to the different restoration strategies and solution techniques. Wavelength conversion is found to be of limited importance, whereas tunability at the end points of the connections has substantial benefits.

First experimental demonstration of a monolithically integrated InP-based waveguide isolator

Abstract The architect should be equipped with knowledge of many branches of study and varied kinds of learning. This knowledge is mainly constructed by means of practice and theory (Vitrivius, 1914). Architectural education is considered to be a complex process. Its creative demands must be supported by an understanding of art, science, psychology, mathematics, engineering and etc. The design studio has long been the major component of architectural education. Traditionally it has involved a relatively small group of students under the direction of a studio master, and an instructor. This paper analyzes the characteristics of traditional studio environments, compares it with the constructivist studio in general and recommends a transformation in the design studio.

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.

Reduction of wavelength blocking through partitioning with wavelength convertors

Wavelength translation is still a controversial subject in the optical network research world. From simulation results of different groups we may, however, conclude that the increased management complexity, if no wavelength translators are used, may be a stronger point to justify wavelength translation than the performance increase, which is relatively small. Most of the performance comparisons between wavelength translated networks [with virtual wavelength paths (VWP)] and wavelength routed networks [with wavelength paths (WP)] done so far assume a fixed traffic matrix.

Study of a Magnetooptic Contact for an Amplifying Waveguide Optical Isolator

We report on the development of an ohmic metal-semiconductor contact for application in an amplifying waveguide optical isolator. It is the result of magnetooptic waveguide simulations combined with experimental extraction of the contact resistivity. The optimized contact scheme is a p⁺⁺-doped hybrid In_0.81Ga_0.19As_0.41P_0.59-In _0.53Ga_0.

Meshed wavelength-division multiplexed networks partially equipped with wavelength converters

d4₇As structure, a compromise between good isolating performance and good electrical behavior

Amplifying Waveguide Optical Isolator With an Integrated Electromagnet

Summary form only given. A lot of work has been reported on the use of wavelength converters (WCs) in wavelength-division multiplexed (WDM) networks. Recent research indicates that for a wide variety of applications the use of WCs in WDM networks results only in modest improvements in throughput, compared to networks without WCs. It has been observed that a limited set of nodes equipped with WCs can give almost equal performance as a virtual wavelength path network, where all nodes are fully equipped with WCs. Furthermore, it has been shown that already a limited form of wavelength conversion can enhance the performance of WDM ring networks. Former work indicates that a limited number of converters should be sufficient to provide decent performance. This paper reports the impact of two different architectures for the optical cross-connect (OXC), containing a limited number of WCs, on the performance of meshed WDM networks. The two OXC architectures considered are: (1) an OXC containing a pool of WCs, where a free WC can be used by any incoming channel, and (2) an OXC where the WCs are dedicated to a particular channel, conversion occurs before the signal is multiplexed on the outgoing fiber.

A method for detecting sub-wavelength features by means of a multimode waveguide and a mode splitting photonic IC

We have demonstrated an amplifying waveguide optical isolator with an integrated electromagnet. This provides a solution to the generally poor magnetic remanence of this type of isolator. The proof of principle is presented and optimization routes are discussed.

Internal connectivity of optical crossconnects in opaque networks

A new method is presented to read optical disks. Light is focused on and picked up from the disk by a multimodal waveguide. Experimental results of a photonic IC controlling these waveguide modes are presented.