Method for fabrication of in-line optical waveguide...

G - Physics – 02 – B

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G02B 6/34 (2006.01) G02B 6/124 (2006.01) G02B 6/12 (2006.01) H01S 3/00 (2006.01)

Patent

CA 2305274

A method and an apparatus for writing apodized Bragg gratings into an optical fiber. The method includes the steps of providing a photosensitive optical fiber and a writing beam. A periodic intensity distribution of period A is created from the writing beam and the optical fiber is translated relative to the intensity distribution at a velocity v(t). The intensity of the writing beam is modulated as a function of time at a frequency f(t), where .v(t)/f(t).apprxeq..LAMBDA.. The intensity of the writing beam is varied further to control the envelope of the refractive index profile to write apodized gratings.

On décrit un procédé et un système pour écrire des réseaux de Bragg apodisés à l'intérieur d'une fibre optique. Le procédé consiste à se munir d'une fibre optique photosensible et d'un faisceau d'écriture. Une distribution d'intensité périodique d'une période LAMBDA est créée à partir du faisceau d'écriture et la fibre optique est transcodée relativement à la distribution d'intensité à une vitesse v(t). L'intensité du faisceau d'écriture est modulée en fonction de la durée à une fréquence f(t) où .v(t)/f(t) APPROX LAMBDA . L'intensité du faisceau d'écriture est de nouveau variée pour réguler l'enveloppe du profil d'indice de réfraction permettant d'écrire des réseaux apodisés.

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