Composite diffraction gratings for signal processing and...

G - Physics – 02 – B

Patent

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G02B 6/34 (2006.01) G02B 5/18 (2006.01) G02B 27/46 (2006.01) G06K 9/74 (2006.01) G02B 6/12 (2006.01)

Patent

CA 2317784

A composite grating structure is disclosed that performs a programmed complex- valued, spectral filtering function on an input optical signal. The grating consists of a plurality of subgratings, each controlling the diffraction of a specific optical subbandwidth of light from an operative input direction to an operative output direction imparting a controllable amplitude and phase change onto the corresponding subbandwidth of light. The set of subgratings comprising the composite grating collectively controls the diffraction of an operative output direction. Each composite grating is programmed through its construction or is dynamically modified to provide a desired spectral filtering function. The composite gratings can be employed for general spectral filtering application but are especially attractive for optical waveform processing, generation, and detection.

La présente invention porte sur une structure de grille optique qui effectue une fonction programmée de filtrage spectral complexe sur un signal optique d'entrée. La grille comprend une pluralité de sous-grilles. Chaque sous-grille guide la diffraction d'une sous-largeur de bande optique spécifique de lumière, d'un sens d'introduction fonctionnel à un sens d'émission fonctionnel conférant une amplitude et une variation de phase contrôlables sur la sous-largeur de bande spécifique de lumière que la diffraction régule dans la largeur de bande fonctionnelle globale. Chaque grille composite est programmée par sa structure ou sa modification dynamique de façon à obtenir des fonctions de filtrage spectral spécifiques. Tandis que les grilles composites peuvent être utilisées dans des applications générales de filtrage spectral, elles conservent un potentiel spécifiquement attractif dans la zone de traitement, génération et détection de formes d'ondes.

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