Inducing refractive index changes in localized regions of optical fibres

摘要

Localised changes in the refractive index of the core 2 of an optical fibre 1 are produced at a plurality of regularly spaced points along the fibre 1, by arranging for a plurality of minute localised regions of the core to be heated by a laser 4 and then allowed to cool in order to induce refractive index changes in the localised regions. IMAGE