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Master's Dissertation
DOI
10.11606/D.18.2018.tde-04122018-111631
Document
Author
Full name
Adélcio Marques de Souza
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2018
Supervisor
Committee
Romero, Murilo Araujo (President)
Santos, Jessé Gomes dos
Sodré Junior, Arismar Cerqueira
Title in Portuguese
Topologias WDM-PON utilizando auto-alimentação com dupla cavidade óptica para Fronthaul analógico de redes 5G
Keywords in Portuguese
5G
Auto-alimentação
Ondas milimétricas
Rádio-sobre-fibra
Redes de acesso
WDM-PON
Abstract in Portuguese
As futuras redes de acesso sem-fio, como a quinta geração de telefonia celular (5G), estão introduzindo e consolidando diversas tecnologias, tais como a operação em ondas milimétricas, picocélulas e o emprego massivo de antenas para diversidade espacial e temporal. Todas essas mudanças trazem desafios para a capacidade dos enlaces presentes nessas redes, como o backhaul e fronthaul. Nas últimas gerações, o ifronthaul tem utilizado Rádio-sobre-Fibra Digital (D-RoF, Digital Radio-over Fiber). Entretanto, neste novo paradigma, o processo de digitalização pode vir a consumir uma largura de banda excessiva e a transmissão analógica dos sinais de RF sobre a fibra se torna uma solução mais atrativa. Ao mesmo tempo, WDM-PON (Wavelength-Division-Multiplexing Passive-Optical-Network) é uma proeminente alternativa para o futuro das PONs, especialmente considerando o seu emprego como fronthaul. Para reduzir a necessidade de diversos transmissores diferentes, várias técnicas de auto-alimentação para obtenção de fontes ópticas agnósticas em comprimento de onda têm sido propostas. O presente trabalho faz um estudo de topologias de auto-alimentação com dupla cavidade para operarem como fronthaul analógico nas futuras redes de acesso sem-fio. Simulações numéricas utilizando o software Optisystem demonstram a viabilidade destas topologias em diversos cenários previstos para estas redes de acesso, especialmente considerando a operação em ondas milimétricas. Transmissões bem sucedidas foram obtidas para sinais ASK, M-PSK e M-QAM em frequências de microondas (1,25, 2,5 e 5 GHz) e ondas milimétricas (38 e 60 GHz) com vazões de 155 Mbps a 10 Gbps utilizando modulação direta e modulação externa.
Title in English
Double-cavity self-seeding WDM-PON topologies as 5G networks analog Fronthaul
Keywords in English
5G
Access networks
Millimeter waves
Radio-over-fiber
Self-seeding
WDM-PON
Abstract in English
Future radio access networks, such as the fifth generation mobile network (5G), are introducing and consolidating disruptive technologies, such as millimeter wave operation, dense picocell coverage and massive use of antennas for spatial and temporal diversity. These new technologies present a challenge for the capacity of the links that are present on these networks, including backhaul and fronthaul. In the latest cellular network generations, the fronthaul was typically implemented by Digital Radio-over-Fiber (D-RoF) technique. However, in this future context, the digitalization process would require a prohibitive bandwidth and the analog transmission of RF signals over the fiber can be a more attractive solution when compared to D-RoF. At the same time, Wavelength-Division-Multiplexing PON (WDM-PON) is prominent alternative for the future of PONs, especially considering its use as fronthaul. In order to avoid employing numerous distinct transmitters, several self-seeding techniques have been proposed to achieve colorless optical sources. This dissertation presents a numerical study of double-cavity self-seeding topologies to serve as analog fronthaul for future radio access networks. Numerical simulations using the software Optisystem demonstrate the feasibility of these topologies in various scenarios envisioned for these access networks, especially considering operation in millimeter waves. Successful transmission was achieved for ASK, M-PSK and M-QAM signals at microwave (1.25, 2.5 and 5 GHz) and millimeter wave (38 and 60 GHz) frequencies with throughput of 155 Mbps to 10 Gbps using direct and external modulation.
 
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Adelcio.pdf (5.96 Mbytes)
Publishing Date
2018-12-05
 
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