Cable technology

Libert, Jean-François; Waterworth, G.

doi:10.1016/b978-0-12-804269-4.00013-1

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…7, in specific visibility conditions, the attenuation values are lower than those ones of the OF, which have been, indeed, considered only for comparison purposes. As a matter of fact, at 1550 nm, the OFs present an attenuation of 0.2 dB /km [78] depicted as a dotted line in Fig. 7.…”

Section: Simulation Resultsmentioning

confidence: 94%

Metropolitan Quantum-Drone Networking and Computing: A Software-Defined Perspective

2022

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Swarms of drones are utilized in a wide range of applications, considering that they can be deployed on-demand and are economically affordable. Furthermore, they can also have a significant role in the creation of future Quantum Networks (QNs). As a matter of fact, the use of drones allows deploying a non terrestrial Quantum Metropolitan Area Network (QMAN), overcoming Optical Fibers' (OFs) limits, due to the large percentage of photons that scatters before reaching the receiver. However, random fluctuations of drones' positions and atmospheric turbulence can affect the quality of the Free Space Optic (FSO) link with a significant impact on performance. Considering that Quantum Drone Networks (QDNs) require significant control, Software-Defined Networking (SDN) paradigm can play a key role in their provisioning. Specifically, an SDN Controller is responsible for managing the global strategies for the distribution of end-to-end (E2E) entangled pairs. Therefore, this paper provides the design of an SDN-based architecture for supporting high-performance Metropolitan Quantum Drone Networks (MQDNs) with a specific protocol for creating entanglement between two Ground Stations (GSs) through the swarm of drones. The proposed architecture can be employed for distributed quantum computing applications and entanglement-based Quantum Key Distribution (QKD) services. Moreover, a suited objective function to optimize the planning and operation of the swarm mission has been proposed. Finally, the paper provides a performance evaluation considering the most relevant metrics, such as fidelity, entanglement rate, and the overhead of the proposed protocol, pointing out that even higher performance than OFs is achievable.

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Section: Simulation Resultsmentioning

confidence: 94%

Metropolitan Quantum-Drone Networking and Computing: A Software-Defined Perspective

2022

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“…Segundo [19,20] o principal fator que pode provocar o aumento da perda ou atenuação em dB/km (α) das fibras ópticas do cabo seria a absorção de Hidrogênio (H2) do ambiente, e nesse caso o ambiente e as condições em que os cabos ópticos e as caixas de emendas ópticas estão instalados oferece um grande peso sobre esse fenômeno, ou devido a absorção de H2 produzido pelos próprios materiais utilizados na construção do cabo e pelos materiais das caixas de emenda, e devido aos métodos de execução e vedação das caixas de emendas.…”

Section: Hidrogêniounclassified

“…Assim, segundo [20], geralmente uma margem de 0,003 a 0,005 dB/km é usada para o envelhecimento da fibra óptica em que os efeitos do hidrogênio desempenham o papel principal, após 25 anos de vida útil do cabo óptico.…”

Section: Hidrogêniounclassified

Efeitos Do Envelhecimento E Expectativa De Vida Útil Em Cabos Ópticos Submarinos

ANDRE CIUFO POEYS

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Ao meu orientador Professor Jean Pierre von der Weid pelo apoio, esclarecimentos, conhecimento, parceria, estímulo e dedicação durante todas as etapas deste trabalho, e aos meus professores do doutorado que contribuíram para o meu aprendizado e desenvolvimento durante o estudo. Ao professor Luís Alencar Reis da Silva Mello, por ter me dado a oportunidade de retornar a PUC-Rio após 14 anos de conclusão do mestrado para realizar o doutorado. Ao Eng. Washington Pimenta da Petrobras pela ajuda, incentivo e torcida sincera durante todo o período do trabalho, nos momentos de normalidade e nos momentos de dificuldades. Aos gerentes da Petrobras com quem eu tive a oportunidade de trabalhar durante os anos de doutorado, pelo apoio e colaboração. Aos meus amigos e colegas da Petrobras, da Escola Técnica Estadual Ferreira Viana e do CETUC, que de alguma forma contribuíram para o resultado, com apoio, colaboração e palavras de incentivo.A todos os amigos e familiares que de uma forma ou de outra me estimularam ou me ajudaram a conseguir com muito esforço e dedicação concluir com êxito esse grande desafio.À Petrobras e a PUC-Rio, pelos auxílios concedidos, sem os quais este trabalho dificilmente poderia ter sido realizado.O presente trabalho foi realizado com apoio da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior -Brasil (CAPES) -Código de Financiamento 001.

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Underwater Communication Systems and Their Impact on Aquatic Life—A Survey

Domingos,

Lotfi,

Ihianle

et al. 2024

Electronics

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Approximately 75% of the Earth’s surface is covered by water, and 78% of the global animal kingdom resides in marine environments. Furthermore, algae and microalgae in marine ecosystems contribute up to 75% of the planet’s oxygen supply, underscoring the critical need for conservation efforts. This review systematically evaluates the impact of underwater communication systems on aquatic ecosystems, focusing on both wired and wireless technologies. It highlights the applications of these systems in Internet of Underwater Things (IoUT), Underwater Wireless Sensor Networks (UWSNs), remote sensing, bathymetry, and tsunami warning systems, as well as their role in reducing the ecological footprint of human activities in aquatic environments. The main contributions of this work include: a benchmark of various underwater communication systems, comparing their advantages and limitations; an in-depth analysis of the adverse effects of anthropogenic emissions associated with communication systems on marine life; and a discussion of the potential for underwater communication technologies, such as remote sensing and passive monitoring, to aid in the preservation of biodiversity and the protection of fragile ecosystems.

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Cable technology

Cited by 3 publications

References 3 publications

Metropolitan Quantum-Drone Networking and Computing: A Software-Defined Perspective

Metropolitan Quantum-Drone Networking and Computing: A Software-Defined Perspective

Efeitos Do Envelhecimento E Expectativa De Vida Útil Em Cabos Ópticos Submarinos

Underwater Communication Systems and Their Impact on Aquatic Life—A Survey

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