Publicação
Investigation of the Operation Modes of Optoelectronic Oscillators based on Resonant Tunnelling Diodes
| Resumo: | This dissertation reports an investigation on simple and compact optoelectronic oscillators (OEOs) that take advantage of the optoelectronic properties of double barrier quantum well (DBQW) resonant tunnelling diodes (RTDs) based photodetectors (RTD-PDs). OEOs are optoelectronic circuits capable of producing low phase noise electronic sine waves and modulated optical continuous wave signals. Generically, they comprise a laser diode (LD), an optical modulator, electric filters, electrical and optical amplifiers, a photodetector (PD), and low loss delaylines such as optical fibers, arranged in a way to convert light energy into stable, spectrally narrow RF/microwave reference signals OEOs applications range from radar technology, satellite communication links, precise metrological time and frequency measurements, reference clock distribution, and high-bit rate, optically supported, communication wireless links, including radio over fiber systems. DBQW-RTDs are nanoelectronic semiconductor devices with N-shape like current-voltage characteristic capable of producing electronic oscillations (up to THz) , due to its ultrawideband negative differential conductance and nanometric dimensions in the direction of the current flow. When incorporating moderately thick light sensitive layers an RTD can operate as a photodetector with built-in gain, known as RTD-PD. Taking advantage of RTD-PD properties (such as electrical gain and light detection) simple and compact low-cost OEOs can be implemented, where the RTD-PDs can replace the need of an optical modulator, and electrical and optical amplifiers: the RTD-PD electrical self-oscillation signal drives the LD, with a fraction of the LD optical output being feed back into the RTD-PD through an optical fiber. During this dissertation, we investigated the optoelectronic characterization of RTD-PD devices aiming their function as amplified photodetectors, including its operation as optical controlled voltagecontrolled oscillators (OC-VCO) being used to implement RTD-PD based OEOs, and present the investigation on the modes of operation of these RTD based OEOs, including injection locking to an external source and self-injection locking. |
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| Autores principais: | Ferro, Tiago Colaço Silva da Franca |
| Assunto: | Díodos de Efeito de Túnel Ressonante Osciladores Optoelectrónicos Sincronização Fotodetetor Teses de mestrado - 2024 |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | This dissertation reports an investigation on simple and compact optoelectronic oscillators (OEOs) that take advantage of the optoelectronic properties of double barrier quantum well (DBQW) resonant tunnelling diodes (RTDs) based photodetectors (RTD-PDs). OEOs are optoelectronic circuits capable of producing low phase noise electronic sine waves and modulated optical continuous wave signals. Generically, they comprise a laser diode (LD), an optical modulator, electric filters, electrical and optical amplifiers, a photodetector (PD), and low loss delaylines such as optical fibers, arranged in a way to convert light energy into stable, spectrally narrow RF/microwave reference signals OEOs applications range from radar technology, satellite communication links, precise metrological time and frequency measurements, reference clock distribution, and high-bit rate, optically supported, communication wireless links, including radio over fiber systems. DBQW-RTDs are nanoelectronic semiconductor devices with N-shape like current-voltage characteristic capable of producing electronic oscillations (up to THz) , due to its ultrawideband negative differential conductance and nanometric dimensions in the direction of the current flow. When incorporating moderately thick light sensitive layers an RTD can operate as a photodetector with built-in gain, known as RTD-PD. Taking advantage of RTD-PD properties (such as electrical gain and light detection) simple and compact low-cost OEOs can be implemented, where the RTD-PDs can replace the need of an optical modulator, and electrical and optical amplifiers: the RTD-PD electrical self-oscillation signal drives the LD, with a fraction of the LD optical output being feed back into the RTD-PD through an optical fiber. During this dissertation, we investigated the optoelectronic characterization of RTD-PD devices aiming their function as amplified photodetectors, including its operation as optical controlled voltagecontrolled oscillators (OC-VCO) being used to implement RTD-PD based OEOs, and present the investigation on the modes of operation of these RTD based OEOs, including injection locking to an external source and self-injection locking. |
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