THESES - Service Manuals
2 manuals available for download
Hybrid Opto/Wireless Systems for Multi-Gigabit Networks at Millimeter Frequencies
This doctoral thesis presents comprehensive research on hybrid optical-wireless systems designed for multi-gigabit communications at 60 GHz millimeter-wave frequencies. The work covers mode-locked lasers (MLL) with quantum dot technology, optical fiber propagation effects, and radio-over-fiber architectures for high-speed wireless networks. The thesis includes detailed characterization of Q-dash semiconductor lasers, analysis of chromatic dispersion impacts on RF power transmission, and investigation of optically injected mode-locked lasers. Technical topics encompass intensity modulation techniques, asymmetric Mach-Zehnder interferometer implementations, and system architectures compliant with IEEE 802.15.3c and ECMA 387 standards. Experimental validation demonstrates practical implementation of 60 GHz communication systems using optical generation methods. This research addresses the fundamental challenges of combining optical fiber transmission with millimeter-wave wireless distribution for next-generation broadband communication networks.
Photonic Frequency Converter Performance Enhancement for Satellite Payloads
Doctoral thesis on the design and optimization of RF frequency conversion modules using semiconductor-based photonic components for satellite telecommunications payloads. The work addresses the increasing demand for higher bandwidth satellite services while reducing payload mass and complexity. The thesis covers satellite communication networks, payload architectures, RF mixer design principles, and photonics integration. Two categories of converters are developed and analyzed: those using electro-absorption modulators (EAM) and semiconductor optical amplifiers (SOA). Comprehensive simulation results using VPIphotonics software are presented, including conversion gain, noise figure, isolation characteristics, and third-order interception point measurements. Experimental validation of three laboratory-tested architectures demonstrates the feasibility of compact, integrated photonic frequency converters for next-generation satellite systems, achieving significant reductions in mass and volume compared to traditional RF components while maintaining required performance specifications.