Optical structure writing system

G - Physics – 02 – B

Patent

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Details

G02B 6/10 (2006.01) G02B 5/18 (2006.01) G02B 6/02 (2006.01)

Patent

CA 2517072

The present invention relates to a system for writing an optical structure in a waveguide.. The system including, means for splitting a light beam into two coherent writing beams, an optical circuit for directing the writing beams along substantially the same optical path in opposite directions such that they produce an interference pattern in an interference region substantially within the waveguide to write the optical structure, said optical circuit including at least two acousto-optic modulators (AOMs) configured to enable a controllable phase shift to be applied to a light beam propagating therethrough, the two AOMs being arranged such that, in use, each AOM shifts the phase of only one of the writing beams, to thereby provide a controllable phase difference between the writing beams.

La présente invention concerne un système d'écriture d'une structure optique dans un guide d'onde. Ce système comprend des moyens de division d'un faisceau lumineux en deux faisceaux d'écriture cohérents, un circuit optique destiné à diriger les faisceaux d'écriture sensiblement le long de la même trajectoire optique, dans des directions opposées, de manière à générer un modèle d'interférence dans une région d'interférence, sensiblement dans le guide d'onde, afin d'écrire la structure optique. Ledit circuit optique est pourvu d'au moins deux modulateurs acousto-optiques (AOMs) configurés de manière à permettre d'appliquer un décalage de phase réglable sur un faisceau lumineux de propagation, les deux AOMs étant disposés de manière que, en cours d'utilisation, chaque AOM décale la phase d'un des faisceaux d'écriture seulement, afin d'obtenir une différence de phase réglable entre les faisceaux d'écriture.

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