Dwdm
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Frequency Domain Interleaving for Dense WDM Passive Optical Network
Abstract In this work, we introduce a new concept of frequency interleaving applied to passive optical networks based in Dense Wavelength Division Multiplexing (DWDM). In order to explore colorless ONUs approach, a single and centralized optical source is used to create the interleaved wavelengths for the downstream and upstream path. In this case, frequency
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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2. Link Optimization and Performance Analysis of a 40 Gbps DQPSK Modulated Ultra DWDM System with 32 Orthogonally Polarized channels
Abstract The demand for higher speed at a lesser transmission cost per bit resulted in growth of optical networks with improved spectral efficiency even at narrower channel spacing. Incorporation of multilevel modulation formats in DWDM system led to the exploration of the 25 GHz channel grid, popularly known as Ultra Dense Wavelength Division Multiplexed (U
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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3. Optimal design of an IP/MPLS over DWDM network
Different approaches for deploying resilient optical networks of low cost constitute a traditional group of NP-Hard problems that have been widely studied. Most of them are based on the construction of low cost networks that fulfill connectivity constraints. However, recent trends to virtualize optical networks over the legacy fiber infrastructure, modified
Pesqui. Oper.. Publicado em: 2014-04
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4. Spectrally-efficient 17.6-Tb/s DWDM optical transmission system over 678 km with pre-filtering analysis
We present and analyze a 17.6-Tb/s DWDM optical transmission composed of 79 channels with 224-Gb/s RZ-DP-16QAM modulation format per-channel and coherent detection. A maximum reach of 678 km is obtained with an optical recirculation loop composed by 226 km of pure-silica core fibers and EDFA amplification only in a 50-GHz grid system with spectral efficiency
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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5. Spectrally-efficient 17.6-Tb/s DWDM optical transmission system over 678 km with pre-filtering analysis
We present and analyze a 17.6-Tb/s DWDM optical transmission composed of 79 channels with 224-Gb/s RZ-DP-16QAM modulation format per-channel and coherent detection. A maximum reach of 678 km is obtained with an optical recirculation loop composed by 226 km of pure-silica core fibers and EDFA amplification only in a 50-GHz grid system with spectral efficiency
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06
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6. OPTICAL NETWORK TRANSFORMATION ON ACCESS AND METROPOLITAN BACKBONE RING: TECHNOLOGICAL AND ECONOMICAL ALTERNATIVES AND NEW SERVICES / A TRANSFORMAÇÃO DAS REDES ÓPTICAS NO ACESSO E NO ANEL BACKBONE METROPOLITANO: ALTERNATIVAS TECNOLÓGICAS, ECONÔMICAS E NOVOS SERVIÇOS
A presente dissertação tem como objetivo avaliar as mudanças que estão ocorrendo nas arquiteturas das redes ópticas dos operadores de telecomunicações para adequarem-se aos novos serviços oferecidos aos usuários. Esses serviços demandam cada vez mais flexibilidade, confiabilidade e capacidade de todos os níveis das redes ópticas, desde o acesso a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/01/2012
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7. Transmission of a 20 Gb/s NRZ OOK signal throughout a 390 km fiber link and a cascade of 11 x 50 GHz filters and 9 x EDFAs
This paper presents a qualitative analysis of the impact caused by fiber propagation effects and by a cascade of optical filters, designed for 10 Gb/s NRZ OOK transmission, and optical amplifiers on a 20 Gb/s NRZ OOK optical signal traveling a 390 km fiber link. The choice for such bit rate and modulation format has been driven by the 50 GHz bandwidth of the
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-06
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8. Controle dos efeitos da mistura de quatro ondas (FWM) para melhoria no gerenciamento do QoS óptico em redes GMPLS/DWDM. / Control of the four wave mixing (FWM) effects for improvement in the optical QOS management in GMPLS /DWDM networks.
This work investigates the effects of the Four-Wave Mixing (FWM) during the lightpaths establishment in a GMPLS/DWDM (Generalized Multiprotocol Label Switching / Dense Wavelength Division Multiplexing) network. In order to minimize their impacts and thus reduce network blocking, strategies based on RSVP-TE (Resource Reservation Protocol- Traffic Engineering)
Publicado em: 2011
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9. POLARIZATION OF LIGHT CONTROL IN MONOMODE OPTICAL FIBERS AND APLICATIONS / CONTROLE DA POLARIZAÇÃO DA LUZ EM FIBRAS ÓPTICAS MONOMODO E APLICAÇÕES
The control of polarization state, as well as a control of all states of polarization of a light signal travelling through a singlemode optical fiber, is performed using different schemes. The polarization control of the signal in a DWDM channel is performed using reference signals in lateral channels in real time. A polarization encoded quantum key distribu
Publicado em: 2009
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10. Estudo de algoritmos RWA em redes GMPLS sobre DWDM
O aumento de usuários e o surgimento de aplicações de redes sofisticadas impulsionam as pesquisas para aprimorar as tecnologias de transmissão de dados, e assim suprir a exigência por largura de banda. Em redes ópticas, um dos principais avanços é o surgimento da multiplexação de comprimento de onda (WDM). Desta forma, uma questão essencial no pro
Publicado em: 2009
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11. Analysis and synthesis of multiplexed systems: an approach of reliability and operational maintainability. / Análise e síntese de sistemas multiplexados: uma abordagem de confiabilidade e manutenabilidade operacional.
The work presented under the heading "Analysis and Synthesis of Multiplexed Systems: An Approach of Reliability and Operational Maintainability" has as objective to consider a practical model for the maintenance, based on the reliability and maintainability of components. The data of this work had been gotten through management reports of the Company of Tele
Publicado em: 2007
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12. Um Estudo da Qualidade de Serviço em redes IP sobre DWDM / A study of the quality of services on IP over DWDM networks
A significant effort has been made in the last years for providing Quality of Service (QoS) in generic communication network, using Internet Protocol (IP). Proposed models by the IETF Internet Task Force Engineering, as Best-effort Services, Int-Serv Integrated Services and DiffServ Differentiated Services, provide and guarantee QoS in these networks. On the
Publicado em: 2006