Method and equipment for writing a bragg grating in a waveguide

Details Method and equipment for writing a bragg grating in a waveguide Method and equipment for writing a bragg grating in a waveguide

G - Physics

02

B

G02B 5/18 (2006.01) B01J 8/00 (2006.01) B01J 8/04 (2006.01)

Patent

CA 2397319

A method for writing a Bragg grating in a waveguide comprises the steps of placing the waveguide in a writing position in which the waveguide extends essentially along one axis; generating a beam of ultraviolet radiation; executing a first and a second scan with the said beam along the waveguide through a phase mask, in such a way as to generate interference fringes capable of modifying the refractive index along the said waveguide in a predetermined way; moving the phase mask, during the first or the second scan, with an oscillatory motion about one of its equilibrium positions and along a direction lying at an angle of less than 90~ to the axis of the said waveguide, in such a way as to produce, in this scan, an essentially zero envelope of the refractive index; and varying the intensity of the energy of the ultraviolet radiation in a controlled way along the waveguide during the first and the second scan, for example by controlling the scanning velocity.

L'invention concerne un procédé d'écriture d'un réseau de Bragg dans un guide d'onde et consistant à placer le guide d'onde dans une position d'écriture dans laquelle le guide d'onde s'étend essentiellement le long d'un axe, à produire un faisceau de rayonnement ultraviolet A, à effectuer un premier et un second balayage au moyen de ce faisceau le long du guide d'onde à travers un masque de phase, de manière à produire des franges d'interférence capables de modifier l'indice de réfraction le long du guide d'onde de façon déterminée, à déplacer le masque de phase, pendant le premier ou le second balayage, au moyen d'un mouvement oscillatoire autour d'une de ses positions d'équilibre et dans la direction située à un angle inférieur à 90 ·C par rapport à l'axe du guide d'onde, de manière à ne pas produire, lors du balayage, d'enveloppe de l'indice de réfraction, et à faire varier l'intensité de l'énergie du rayonnement ultraviolet de façon contrôlée le long du guide d'onde pendant le premier et le second balayage, par exemple par contrôle de la vitesse de balayage.

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