Inteligência artificial utilizando linguagem C
Schildt, Herbert
cop. 1989
Search results
23 records were found.
Tese de Doutoramento em Engenharia Electrotécnica, Universidade de Aveiro, 2014
Contém referências bibliográficas
Proveniente do ex-CDE do IPCB
Tese de Doutoramento em Engenharia Eletrotécnica apresentada à Universidade de Aveiro.
Over the years, the increased search and exchange of information lead to an increase of traffic intensity in
todays optical communication networks. Coherent communications, using the amplitude and phase of the signal,
reappears as one of the transmission techniques to increase the spectral efficiency and throughput of optical
channels. In this context, this paper present a survey on format conversion of modulated signals using MZI-
SOAs, based exclusively on all-optical techniques through wavelength conversion. We also present two proposal using all-optical techniques: One for the conversion of amplitude modulation signals to a continuous phase modulation format, and another technique for the conversion of OOK signals to QPSK and QAM signals. Both approaches are experimentally validated.
Vol. 2 : Practice. - 169 p.
This paper proposes a new methodology for the generation of quadrature amplitude modulation signals, based on all-optical processing from nonlinear interferometric devices. The degradation of the systems performance is numerically analyzed, as a function of operational parameter’s unbalance and physical impairments of the system. The results shows that the probe laser power and the coupling factor of optical couplers are the most sensitive parameters of the proposed format conversion system.
As redes de Bragg (FBG) tornaram-se componentes importantes na redes de comunicações ópticas, pois permitem a realização de várias operações sem a necessidade de conversão opto-electrónica. Este artigo descreve uma ferramenta de software para simulação e caracterização de redes de Bragg por nós inteiramente concebida. A interface gráfica foi programada utilizando o ambiente GUIDE do Matlab. É assim possível analisar um leque variado de FBGs, tendo em consideração os efeitos secundários provocados pela variação do índice de refracção médio, durante o processo de fabrico.
“Copyright © [2010] IEEE. Reprinted from 15th IEEE Mediterranean Electrotechnical Conference. ISBN: 978-1-4244-5793-9.
This material is posted here with permission of the IEEE. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org.
By choosing to view this document, you agree to all provisions of the copyright laws protecting it.”
“Copyright © [2010] IEEE. Reprinted from ICTON 2010. ISBN: 978-1-4244-7799-9.
This material is posted here with permission of the IEEE. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or
for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org.
By choosing to view this document, you agree to all provisions of the copyright laws protecting it.”
“Copyright © [2013] IEEE. Reprinted from IEEE Journal of Selected Topics in Quantum Electronics. ISSN: 1932-4553. This material is posted here with permission of the IEEE. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.”
This paper experimentally demonstrate an all-optical phase modulation technique using both arms of a Mach-Zehnder interferometer structure with Semiconductor Optical Amplifiers (MZI-SOA), with NRZ modulated signals driven at 10 Gbit/s. The proposed optical phase modulator can be used in multi-level modulation signals generation, as an optical routing element, as well in optical code division multiple access transmission systems.
A novel generation scheme of QPSK format using dual MZI-SOA in serial configuration
is presented. The feasibility of 20 Gb/s QPSK signal with coherent detection is
experimentally shown.
In this paper, we investigate through simulation the feasibility of amplification solutions
for WDM ring PON encompassing C+L transmission bands. The system under analysis
is composed by a bidirectional pump at 1480 nm with 1 W of power in each direction
and 16 channels (8 C band + 8 L band). The simulation describes an 80 km WDM ring
with 8 nodes in which 2 channels are added/dropped. Two scenarios were
implemented, one with simple Raman amplification that considers that all the pump
power travels along the ring being selected the optimal order to drop channels and
another with C- band in line EDFA in the link mid length that performs and additional
amplification on C band signals. The results of both approaches are compared and their
suitability for practical PON is analyzed.
