Obiettivo
The objective of COUSTO was to develop an integrated acousto-optical device including processing in the 0.1-1GHz range. This was to include various optical elements as well as the radiation source and suitable detectors for a 1-D signal. Applications for such a device range from super-fast LAN connections to 1-D correlation in radar processing systems (for dynamic clutter rejection).
The key to acoustooptics is the interaction between sound and light in a crystal (the Bragg cell). The interaction modifies not only the amplitude, frequency and phase of the light beam but also its direction. In this way, the information carried by both the sound and light is processed and revealed. By the use of integrated optics, the information brought by the device under development measures the degree of similarity between an input signal and a reference signal by computing their correlation. The Bragg cell used in the integrated device was a surface acoustic wave (SAW) cell. Various alternatives for the different components were studied and compared with respect to the required performances: The lithium niobate (LiNbO3) substrate on which the waveguides were fabricated was found to be the best option for the acoustooptic interaction zone. The most significant alternative material, silicon, was rejected because of its poor acoustic properties in spite of the possibility of integrating the optical detectors directly on the silicon substrate. The protonic exchange technique was selected to build the wavegudies on the Y-cut of the lithium niobate. The 2 signals, received and reference, are launched in opposite directions, and their correlation, taking place in the interaction zone, results in the deviation of the incoming laser produced light. The niobate (Nb205) Fresnel option was selected to build the collimating lens (between) the laser source and the acoustooptic interaction region) and the detector lenses (between the acoustooptic interaction region and the detector). The project pioneered a lithium niobate waveguide with the proton exchange process. A well engineered working device with integrated optics was delivered, demonstrated and evaluated, operating at a central frequency of 850 MHz with a bandwidth of 300 MHz.
The key to acousto-optics is the interaction between sound and light in a crystal (the Bragg cell). The interaction modifies not only the amplitude, frequency and phase of the light beam but also its direction. In this way, the information carried by boththe sound and light is processed and revealed.
By the use of integrated optics, the information brought by the device under development measures the degree of similarity between an input signal and a reference signal through computing their correlation. The Bragg cell used in the integrated device in this project was a surface acoustic wave (SAW) cell.
Various alternatives for the different components were studied and compared with respect to the required performances:
-The lithium niobate (LiNbO3) substrate on which the waveguides were fabricated was found to be the best option for the acousto-optic interaction zone. The most significant alternative material, silicon, was put aside because of its poor acoustic propert ies in spite of the possibility of integrating the optical detectors directly on the silicon substrate. The protonic exchange technique was selected to build the waveguides on the Y-cut of LiNbO3. The two signals, received and reference, are launched in opposite directions, and their correlation, taking place in the interaction zone, results in the deviation of the incoming laser-produced light.
-The Nb2O5 Fresnel option was selected to build the collimating lens (between the laser source and the acousto-optic interaction region) and the detector lenses (between the acousto-optic interaction region and the detector).
The project pioneered a LiNbO3 waveguide with the proton exchange process. A well-engineered working device in integrated optics was delivered, demonstrated and evaluated, operating at a central frequency of 850 MHz with a bandwidth of 300 MHz.
Exploitation
The partner companies will endeavour to capitalise on the results achieved so far by developing system components in integrated optics: an interferometric spectrum analyser and a wide bandwidth correlator are some of the envisaged short-term exploitation of the results. Longer-term exploitation requires improvement of performance of the device.
Campo scientifico (EuroSciVoc)
CORDIS classifica i progetti con EuroSciVoc, una tassonomia multilingue dei campi scientifici, attraverso un processo semi-automatico basato su tecniche NLP. Cfr.: Il Vocabolario Scientifico Europeo.
CORDIS classifica i progetti con EuroSciVoc, una tassonomia multilingue dei campi scientifici, attraverso un processo semi-automatico basato su tecniche NLP. Cfr.: Il Vocabolario Scientifico Europeo.
- scienze naturali scienze chimiche chimica inorganica metalli alcalini
- ingegneria e tecnologia ingegneria elettrica, ingegneria elettronica, ingegneria informatica ingegneria elettronica elaborazione del segnale
- ingegneria e tecnologia ingegneria elettrica, ingegneria elettronica, ingegneria informatica ingegneria informatica telecomunicazioni tecnologia radio radar
- scienze naturali scienze chimiche chimica inorganica metalloidi
- scienze naturali scienze fisiche ottica fisica dei laser
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Programma(i)
Programmi di finanziamento pluriennali che definiscono le priorità dell’UE in materia di ricerca e innovazione.
Programmi di finanziamento pluriennali che definiscono le priorità dell’UE in materia di ricerca e innovazione.
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Meccanismo di finanziamento (o «Tipo di azione») all’interno di un programma con caratteristiche comuni. Specifica: l’ambito di ciò che viene finanziato; il tasso di rimborso; i criteri di valutazione specifici per qualificarsi per il finanziamento; l’uso di forme semplificate di costi come gli importi forfettari.
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Coordinatore
00013 Roma
Italia
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