3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-1185-C5-1188
Filtre optique accordable par interaction acousto-optique colinéaire à ondes de surfaceC. ZUCCHI1, E. BIGLER2 and A. ZAREMBOWITCH1
1 Département de Recherches Physiques, Université Pierre et Marie Curie, T. 22, 4 place Jussieu, 75252 Paris cedex 05, France
2 Laboratoire de Physique et Métrologie des Oscillateurs, Université de Franche-Comté, 32 av. de l'Observatoire, 25000 Besançon, France
Acousto-optical mode convecters are the basic elements for a variety of integrated optical circuits. It has been demonstrated that efficient acousto-optical mode converters with a large tuning range and low drive power can be realized in a combined structure of acoustical and optical waveguides. We use an acoustical directional coupler to obtain a weighted coupling resulting in a theorical filter response with large sidelobe suppression. Nearly 100% TE/TM polarization conversion efficiency was achieved using only 3 mW of applied RF power in a 1.52 µm filter of 2 nm optical bandwidth on a cristal of LiNbO3. Yet, the absolute sidelobe levels were significantly higher than expected. This is presumably due to nonuniformity in the effective birefringence of the optical waveguides.
© EDP Sciences 1994