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Contribution à l'étude de liaison optiques analogiques pour la distribution de signaux de référence en gammes RF et micro-ondes

Abstract : Fiber optics constitutes an attractive alternative to conventional wiring for numerous analog applications. Indeed, in addition to its small size and low mass, the fiber does not interfere with electronic devices and provides an excellent isolation of the transmitted signal. One of the targeted applications of our work is the reference frequency signal distribution to various subsystems of a telecommunications satellite. Another application could be remote antenna synchronization and control, or the access to the various elements of an active antenna. However, to meet our system requirements, the fiber optics link should not degrade the signal quality, and particularly its phase noise. In this work, the phase noise optimization of various fiber optics links is presented. The problem is studied on the emitter side (the laser) and the receiver side. However, an original approach has been developed mostly for the receiver. This approach is the photo-oscillator approach, which consist in a synchronization of an oscillator using the signal of the modulated optical wave. The interest of this approach lies in the natural phase noise filtering far from the carrier and in the constant output power delivered by this system. Various photo-oscillators have been designed and characterized at 10 MHz, 874.2 MHz and 3.5 GHz. The 10 MHz application is dedicated to the signal distribution of ultra stable crystal sources (OCXO). The phase noise requirements for the two other applications (874.2 MHz and 3.5 GHz) are not so critical. However, it was important to determine the interest of the approach and the devices which have to be used to implement it successfully.
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Submitted on : Friday, April 13, 2007 - 11:15:07 AM
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  • HAL Id : tel-00141548, version 1


Gianandrea Quadri. Contribution à l'étude de liaison optiques analogiques pour la distribution de signaux de référence en gammes RF et micro-ondes. Micro et nanotechnologies/Microélectronique. Université Paul Sabatier - Toulouse III, 2004. Français. ⟨tel-00141548⟩



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