| 摘要 |
The invention relates to a process for the production of graded-index profiles in polymeric optical fibres. The process is based on the fact that ionizing radiation causes an increase in the refractive index, for example in PMMA. Therefore, polymeric optical fibres, preforms or fibre-core preforms are irradiated with ionizing radiation of predetermined wavelength and dose while being moved past the radiation source in the longitudinal direction at a given speed and are subsequently tempered for a defined length of time. Through the control of the spatial distribution of the ionizing radiation by means of mirrors, lenses or aperture systems, a uniform radial graded-index profile is produced over the entire fibre length, with the result that the polymeric fibre, used as an optical waveguide, has considerably improved transmission characteristics for optical signals.
|
