Encontrados 8 documentos, a visualizar página 1 de 1
Communication Systems with Optical Amplification
Luís Filipe Botelho Ribeiro; José Ferreira da RochaThis thesis addresses the impact of optical amplifiers on optical communication systems EDFA's principles and characteristics are studied with emphasis en both optical gain and noise. Saturation behaviour is focused. The potential of alternative modelling techniques is discussed and a few modifications are successfully introduced. (...)Keywords: optical amplifiersPh.D., 1995more info: http://opac...
Analysis of Coherent FSK Optical Systems and Study of High Performance Optical ...
Carlos Júlio Rodrigues Ferreira Lourenço; José Ferreira da RochaThis work contributes with a study at the system level and the careful design of the optical receiver, especially the optical front-end, which presents the novelty of being balanced and simoultaneously tuned. Then the contribution of this dissertation consists firstly on the system design, in terms of the technical and operational parameters, as well as in the design and implementation of the optical front-end....
Broadband Networks on Reidential Areas. Passive Optical Network Limits
Jorge Manuel G. Martins Barriga; José Ferreira da RochaThe telecommunication field is facing a fast expansion in terms of services available and users. The growing requirements in terms of transmission capacity per use as well as the need to establish an integrated infrastructure to provide the present and future services have driven to the developmenf of the BISDN (Broadband Integrated Services Digital Network) concept. (...)Keywords: broadband networksM.S., ...
Line Codes for FSK Optical
Artur Neves de Sousa; José Ferreira da RochaIn this dissertation, it is study the non linear FM characteristic problem of semiconductor Lasers in low frequencies and the use of line coding as a method to partially overcome this problem. (...)Keywords: line codes; optical systemM.S., 1996more info. http://opac.ua.pt/F/?func=find-b&find_code=SYS&REQUEST=000084462 ; Nesta dissertação estuda-se o problema da característica ...
Strategy for use of Optical Fiber on Mobile Bradband Networks
António Francisco Pinto de Oliveira; José Ferreira da RochaIn this dissertation I studied the implementation of a mobile broadband system, namely the specifications drawn For the MRS (Mobile Broadband System) developed under RACE 11 program. (...)Keywords: MBSM.S., 1996more info. http://opac.ua.pt/F/?func=find-b&find_code=SYS&REQUEST=000096582 ; Nesta dissertação, estuda-se a implementação da rede fixa de um sistema móve...
A Study on the Return Channel of a HFC network
Isabel Borges Ribeiro; José Ferreira da RochaAn access network for the provision of interactive, services is studied along this work, It is an Hybrid-Fibre-Coax (HFC) network with end-to-end ATM technology. The multiple access schemes providing guaranteed network performance are analised with special care, namely those contentionless and with fixed assignment. (...)Keywords: HFC networks; interactive servicesM.S., 1998more info. http://opac.ua.p...
Primitivas de Gestão para uma Estação FDDI-SAS
João Agostinho Pavão; Nelson Pacheco da Rocha; José Ferreira da RochaThe FDDI - Fiber Distributed Data Interface - defines a network topology with a dual ring, using optical fiber as the transmission media. Due to its high bandwidth (100 Mbps) it can be used as a modern service network.This paper is about a project of an FDDI-SAS (FDDI Single Attach Station), using a PC/AT as the host to the station, built using a specific chip set from National Semiconductor Corporation.A speci...
"As crenças e valores culturais da família piscatória no cuidar do recém-nascid...
Martins, Maria José Ferreira da Rocha das NevesCiências de Enfermagem ; Master Degree in Sciences of Nursing
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||