Conception, étude théorique et réalisation d'un convertisseur intensité-fréquence optoélectronique à amplificateur opérationnel et MOSFETs de puissance

Abstract : The present work originates in the experimental and theorical study of the external modulation of a laser beam by electrooptical materials, in the Senarmont arrangement ; the aim is to contribute to the development of the optical telecommunications. A phase modulated laser beam is transported at a certain distance where it is transformed into an amplitude modulation. It is thus necessary to conceive, to realise and to test an electronic device able to detect the transmitted information, but in a form immediately useful in digital systems. The device imagined transforms the amplitude modulation of the light beam into an electronic frequency (Converter of Intensity to Frequency :CIF), with the care not only to avoid any increase of noise but in the contrary to decrease it. By its basic conception, the device is able to be connected directly to a microprocessor, part of a more complex system. Our work presents the association of the photodetection to the optoelectronic integration, accompanied by three realisations ; The theoretical principles have been confirmed by the experimental results relative to linearity, dynamical range, noise characteristics and the improvsement of the SNR. The advantage of the PLL type as detector was emphasised. The possible applications of a CIF concern in general systems in which the noise is high in low frequencies, in systems in which the optical signal incident power is very weak, when the interest is focused on the integration of the optical pulses, or finally in the case of the production of active electronic devices
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Stephanos Tsitomeneas. Conception, étude théorique et réalisation d'un convertisseur intensité-fréquence optoélectronique à amplificateur opérationnel et MOSFETs de puissance. Autre. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ062S⟩. ⟨tel-01751994⟩

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