All Optical Networks
Mostrando 1-12 de 35 artigos, teses e dissertações.
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1. Analysis Tool for Passive Optical Access Network
Abstract Fiber optic access networks have been considered a definitive solution to the constant need for increasingly higher bandwidths. For this reason, PON (Passive Optical Network) have grown enormously in the recent years, offering different solutions to the end customer, whether it is residential or business. However, the PON project is complex and a ti
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. COMPARISON OF GNSS INDICES, IONOSONDES AND ALL-SKY IMAGERS IN MONITORING THE IONOSPHERE IN BRAZIL DURING QUIET AND DISTURBED DAYS
Abstract Measurements from the Global Navigation Satellite System (GNSS) have become a leading data source for ionospheric studies. Different technologies are used to monitor the ionospheric layer. It is possible to carry out this monitoring using GNSS networks through the indices of ionospheric irregularities, as well as through ionosondes and imagers. It h
Bol. Ciênc. Geod.. Publicado em: 14/10/2019
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3. 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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4. Experimental-based subsystem models for simulation of heterogeneous optical networks
This work presents and analyzes experimental-based subsystem models for Erbium doped fiber amplifiers (EDFAs) and wavelength selective switches (WSSs) under operation in a metropolitan optical network testbed. Firstly, the performance of the EDFAs and two gain control types are analyzed in a heterogeneous experimental setup with lightpaths modulated at 10G/1
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-12
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5. Hybrid distributed Raman/EDFA amplifier with hybrid automatic gain control for reconfigurable WDM optical networks
Nowadays, optical amplifiers designs are induced by new requirements generated by optical networks. The introduction of WDM reconfigurable networks with increasing rate from 10-40 Gb/s to 100 Gb/s and beyond, demand new optical amplifiers development with improved gain spectral flatness and noise figure for all operational range of input powers and set-point
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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6. Comparing OSNR based policies for an adaptive-alternative IA-RWA algorithm applied to all-optical networks
We propose two policies to select the route for an adaptive-alternative routing algorithm for all-optical networks. We use the NrPSR to find the Nr routes with lower cost for a given source-destination pair according to a cost function expanded in a power series (PSR) in which the coefficients are determined by a Particle Swarm Optimizer (PSO). The selected
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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7. All-optical cryptography through spectral amplitude and delay encoding
All-optical data encryption is a promising technology that could lead communication systems to an unprecedented degree of security. In this paper we use computer simulations to systematically investigate a new all-optical cryptography technique that is bit-rate independent and transparent to modulation formats. Encryption encompasses signal spectral slicing
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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8. Optical cryptography through analog control of amplitude and delay of spectral slices: anlysis for NRZ and DQPSK signals. / Criptografia Ãptica mediante controle analÃgico da amplitude e do atraso de fatias espectrais: anÃlise para sinais NRZ e DQPSK.
This work investigates a technique to encrypt the optical signal for Transparent Optical Network, TON, in order to safeguard the confidentiality and guarantee the security of informations that are transmitted through the Telecommunications Network. The technique is assessed on the physical layer of the reference model for open systems interconnection, OSI, a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/11/2012
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9. Experimental analysis of all-optical 4-ASK signal generation through parametric amplification
We present experimental results concerning a new alloptical technique that multiplexes two binary signals into a quaternary one (4-ASK). The technique is based on parametric amplification. Values of the quaternary levels obtained experimentally, as a function of the extinction ratios of the binary input signals, show a rather good agreement with the simulate
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2012-06
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10. Modelo markoviano de decisão para o roteamento adaptativo em redes WDM totalmente ópticas / Markov decision model for adaptive routing in all-optical WDM networks
As redes ópticas WDM têm sido cada vez mais utilizadas, visto que aproveitam melhor a capacidade de transmissão das fibras ópticas. Com o intuito de evitar conversões óptico-elétricas na transmissão de dados entre os nós da rede, dispositivos capazes de manter a comutação dos sinais no domínio óptico são instalados em cada nó, tornando a rede
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/03/2011
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11. Heuristic solutions related to challenges of optical burst switching paradigm
Several optical network switching paradigms have been under intensive research to support rapidly increasing bandwidth requirements. Of all these paradigms, optical burst switching (OBS) is a promising switching paradigm for the next-generation Internet infrastructure. Despite the significant contributions of OBS to high speed networks such as dynamic connec
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-12
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12. 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