LICHTGELEIDEND ORGAAN, WERKWIJZE VOOR HET LOS OMGEVEN VAN EEN OPTISCHE VEZEL MET EEN HULS EN INRICHTING VOOR HET UITVOEREN VAN DE WERKWIJZE.

摘要

IMPROVEMENTS IN OR RELATING TO DIELECTRIC OPTICAL WAVEGUIDES A method of coating a fibre in which a sleeve of polymer is extruded, fibre is fed into the sleeve as it is formed, and the diameter of the sleeve is reduced by a drawing process to produce a sleeve of polymer which loosely envelops the fibre. We also provide a fibre having a tubular sleeve of polymer, the sleeve having its molecules orientated to lie longitudinally with respect to the axis of the fibre. The sleeve has relative strength in a longitudinal plane and relative weakness in a transverse plane.