Photonic-assisted wireless millimeter-wave and terahertz imaging and communications
(English) This thesis investigates the design, development, and characterization of optical-enabled wireless systems operating in the millimeter wave (mmWave) and Terahertz (THz) frequency ranges, addressing the need for high-capacity, low-latency networks in next-generation communication systems. I...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/427422 |
| Acceso en línea: | https://hdl.handle.net/2117/427422 https://dx.doi.org/10.5821/dissertation-2117-427422 |
| Access Level: | acceso embargado |
| Palabra clave: | Sistemas inalámbricos Fotónica asistida mmWave (ondas milimétricas) THz (terahercios) Antenas reconfigurables Radio sobre fibra (RoF) Conversión de frecuencia óptica (OFC) Formación de haces (beam steering) Antenas fotoconductoras (PCA) 621.3 - Enginyeria elèctrica. Electrotècnia. Telecomunicacions Àrees temàtiques de la UPC::Enginyeria de la telecomunicació |
| Sumario: | (English) This thesis investigates the design, development, and characterization of optical-enabled wireless systems operating in the millimeter wave (mmWave) and Terahertz (THz) frequency ranges, addressing the need for high-capacity, low-latency networks in next-generation communication systems. In the context of optical networks, analog radio-over-fiber (A-RoF) systems are optimized for 5G frequencies wireless communication. Key advancements include the demonstration of cascaded optical modulators capable of performing optical frequency conversion (OFC), and optical power budget (OPB) enhancement. The study follows with the integration of photodetectors (PDs) and antennas, where reconfigurable photonically-aided antennas are designed and experimentally validated for operation at 30GHz and 50 GHz. These antennas showcase optimal impedance matching and efficient performance, leveraging flip-chip bonding techniques to ensure compact and scalable designs. For beam steering, a photonic-assisted lens array system is developed, showing excellent control of directional beams through theoretical analysis and experimental validations, with potential applications in satellite communications and advanced sensor networks. In the THz domain, photoconductive antennas (PCAs) are evaluated for time domain spectroscopy (TDS). Alignment procedures are improved, and a novel cross-polar beam pattern analysis method is introduced to identify fabrication tolerances and improve performance. These contributions enhance the precision and reliability of THz imaging and spectroscopy setups. The results present in this thesis highlight the potential of photonically integrated systems to contribute on bridging the gap between optical and wireless domains, offering robust solutions for next-generation communication networks and high-frequency sensing applications. |
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