Dispositifs acousto-optiques dispersifs programmables pour lasers ultrabrefs

LASERS A BLOCAGE DE MODES A BASE DE BATONNETS QUANTIQUES InAs/InP POUR LES COMMUNICATIONS OPTIQUES

Quantum dot based mode locked lasers for optical frequency combs. (Lasers à blocage de modes à base de boîtes et bâtonnets quantiques pour les peignes de fréquences optiques)

Optical frequency combs, generating tens of equally spaced optical carriers from a single laser source, are very attractive for next-generation wavelength division multiplexing (WDM) communication systems. This PhD thesis presents a study on the optical frequency combs generated by mode-locked laser diodes based on low-dimensional semiconductor nanostructures. In this work, the mode-locking per...

Synchronous acousto-optic tuning of free-space external-cavity lasers.

Mechanically tuned external-cavity lasers in which the cavity and the mode filter are tuned synchronously are well known and commercially available. The synchronicity allows phase-continuous tuning to be obtained. Acousto-optic tuning has potential advantages in terms of speed, stability, and precision, but a method for synchronous tuning is required. We propose such a method and describe its e...

Saisie de texte en contexte dégradé sur interfaces réduites pour dispositifs mobiles

XMobile : Un environnement pour la génération d'interfaces adaptées aux dispositifs mobiles

Ubiquitous Computing promises seamless access to information anytime, anywhere with different and heterogeneous devices. This kind of environment imposes new challenges to Information Systems: information and its user interface must be adapted according to the contextual characteristics (user, environment, access device). In the specific case of the device adaptation, the challenge of the devel...