GVD

Resumen: Debido a la necesidad de transmitir mayor cantidad de información a velocidades elevadas y sobre grandes distancias es necesario mitigar el fenómeno de la dispersión en una fibra, el cual es un gran problema en sistemas de comunicación óptica. Una solución a este problema es el uso de solitones, los cuales mantienen la forma del pulso después de propagarse por grandes distancias. Los solitones se forman debido al balance entre los efectos dispersivos (GVD, Group Velocity Dispersion) y no lineales (SPM, Self Phase Modulation) en sistemas de comunicación ópticos basados en solitones, estos pueden ser aplicados en distancias de varios miles de kilómetros con una gran capacidad para transportar información con el uso de amplificadores ópticos. En este artículo se estudia y simula en OPTISYSTEM la propagación de los solitones a velocidades de varios Gbps a través de fibras monomodo estándar (SSMF, Single Mode Optical Fiber) y fibras monomodo de dispersión desplazada (DSF, Dispersion Shifted Fiber), en conjunto con fibras compensadoras de dispersión (DCF, Dispersion Compensating Fiber), sobre decenas de miles de kilómetros, con el objetivo de analizar su comportamiento y mejora en el desempeño de la transmisión.

Abstract: Because of the need to transmit as much information at high speeds and long distances is necessary to mitigate the phenomenon of dispersion in a fiber, which is a big problem in optical communication systems. One solution to this problem is the use of solitons, which maintain the shape of the pulse after propagation over long distances. Solitons are formed by the balance between dispersive effects (GVD, Group Velocity Dispersion) and nonlinear (SPM, Self Phase Modulation), in optical communication systems based in solitons, they can be applied in distances of several thousand of kilometers with a large capacity to carry information with use of optical amplifiers. In this article is studied and simulated in OPTISYSTEM the propagating of solitons to rates of Gbps through standard single mode fiber (SSMF, Standard Single Mode Fiber) and dispersion shifted fiber (DSF, Dispersion Shifted Fiber) as well as dispersion compensating fibers (DCF, Dispersion Compensating Fiber) over tens of thousands of kilometers, with the aim of analyzing its behavior and improvement in the performance of the transmission.

Originally developed for file sharing, P2P concepts are predestinated to realize infor- mation sharing in a more general way. Combined with the well known concept of loosely coupled multidatabases they provide a promising fundament for sharing data and metadata across autonomous and heterogenous data sources. The D´õgame architecture allows each participating data source to decide autonomously, which kind of information

The integral processing of data and metadata is starting to get recognized as a central challenge for the next decade (eg in Pat Selinger's ICDE 2005 Keynote) not only as part of realizing the Semantic Web vision, but also on a smaller scale as part of the next generation of desktop data management (cf. Apple's Spotlight and Microsoft's WinFS). In this article, we focus on metadata represented in the W3C's RDF formalism. We illustrate first steps towards integrating access to RDF metadata and access to standard Web data in ...