Importance

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Abstract

In a known procedure for the manufacture of an optical fiber by drawing from a preform with a core-clad structure or from a coaxial arrangement of several components forming a core-clad structure, a core cylinder is produced with a soot deposition method, with the core cylinder having a core glass layer of a higher refractive index, 'n.sub.K', and outer diameter, 'd.sub.K', said core glass layer being encased by a first cladding glass layer having a lower refractive index, 'n.sub.M1', and outer diameter, 'd.sub.M1', followed by applying a second cladding glass layer onto the core cylinder. The modification of this procedure according to the invention is characterized by its lower optical fiber production costs. This is achieved by providing the second cladding glass layer (4) in the form of a cladding tube manufactured in a separate step of the procedure, said cladding tube having a mean OH concentration of max. 1 wt.-ppm, and applying the second cladding glass layer (4) by collapsing the cladding tube onto the core cylinder (2; 3), and by using a core cylinder with a 'd.sub.M1'/'d.sub.K' ratio between 1 and 2.2 and a mean OH concentration of max. 1 wt-ppm in its superficial area up to a depth of 10 .mu.m (FIG. 1).

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First Claim