Method and apparatus for writing a bragg grating in a waveguide

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

G - Physics

02

B

G02B 6/02 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2402535

In order to create a diffraction grating in an optical fiber with a predetermined pattern of the refractive index, an ultraviolet radiation beam (3) is scanned (5, 8) along a photosensitive portion (F') of the fiber through a phase mask (9) and, during the scan, the beam intensity (4) and the mask- fiber distance (10) are controlled moment by moment in such a way as to obtain the desired patterns of the mean value and of the envelope of the refractive index, respectively.

Pour établir un réseau de diffraction dans une fibre optique selon un profil prédéterminé d'indice de réfraction, on balaie (5, 8) une zone photosensible (F') de la fibre avec un faisceau de rayons ultraviolets (3) à travers un masque de phase (9) et, durant le balayage, l'intensité du faisceau (4) ainsi que la distance masque-fibre (10) sont contrôlées moment par moment de façon à obtenir le profil souhaité de la valeur moyenne et de l'enveloppe de l'indice de réfraction, respectivement.

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