METHOD OF AND DEVICE FOR PROVIDING A CONCENTRIC ENVELOPE ON AN END OF AN OPTICAL FIBRE, AND FIBRE END PROVIDED WITH AN ENVELOPE IN ACCORDANCE WITH THE METHOD

摘要

3.9.1979 1 PHN 9235 Method of and device for providing a concentric envelope on an end of all optical fibre, and fibre end provided with an envelope in accordance with the method. The invention relates to a method of and a device for providing on outer surface of an envelope, being concentric to a light-conductive core, around a mono-mode optical fibre; this means that the eccentricity of the fibre plus envelope may amount to 0.1 /um for a core diameter of 3 /um. This accuracy is achieved by splitting a light beam, emerging from the end of the fibre which is clamped in an envelope into two beams by means of rotating optical means, each of said beams producing a circular image. By a suitable choice and adjustment of the optical means, the two light beams will form oppositely moving images when the fibre end is displaced with respect to the axis of rotation and observation. When the images are concentric, the fibre end is situated on the axis of rotation. Machining of the envelope of a tool which rotates around the axis of rotation results in an envelope which is concentric to the light-conductive core of the fibre.